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Article

An Analysis of the Genetic Diversity of Bread Wheat x Spelt Breeding Lines in Terms of Their Resistance to Powdery Mildew and Leaf Rust

by
Klaudia Goriewa-Duba
1,*,
Adrian Duba
2,
Elżbieta Suchowilska
1 and
Marian Wiwart
1
1
Department of Plant Breeding and Seed Production, University of Warmia and Mazury in Olsztyn, pl. Łódzki 3, 10-724 Olsztyn, Poland
2
Department of Entomology, Phytopathology and Molecular Diagnostics, University of Warmia and Mazury in Olsztyn, Prawocheńskiego 17, 10-719 Olsztyn, Poland
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(5), 658; https://doi.org/10.3390/agronomy10050658
Submission received: 1 April 2020 / Revised: 28 April 2020 / Accepted: 4 May 2020 / Published: 7 May 2020
(This article belongs to the Special Issue Cereal Rust Management for Improving Global Food Security)
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Abstract

:
The main aim of this study was to analyze the genetic diversity of breeding lines derived from bread wheat and spelt (bread wheat cvs. Zebra, Torka and Kontesa; spelt breeding lines S10–S14) in terms of their resistance to infections caused by Blumeria graminis f. sp. tritici and Puccinia triticina Eriks. The genomes of all analyzed lines harbored the markers for Pm2a, Pm4b and Pm6a alleles, which confer resistance to the infection caused by B. graminis f. sp. tritici. The markers for Pm4c and Pm4a alleles were also identified in many objects. The high number of Pm markers was noted in the crosses Zebra × S11 and Zebra × S12 whose genomes harbored the markers for Pm2a, Pm3d, Pm4a-4c and Pm6. Most of the studied lines harbored the marker linked to the Lr10 gene, which encodes resistance to the infection caused by P. triticina in wheat. The analysis of the presence of markers linked to the resistance to infections caused by B. graminis f. sp. tritici and P. triticina demonstrated that Zebra × S12 was the most promising breeding line with the highest number of markers for genes/alleles encoding resistance to powdery mildew and leaf rust. This breeding line was also highly resistant to both pathogens under field conditions.

1. Introduction

Biodiversity conservation in crops, in particular wheat, is one of the greatest challenges facing cereal breeders in the 21st century [1]. Modern bread wheat (Triticum aestivum L.) varieties have to be characterized by high yields, high protein content, as well as high resistance to biotic and abiotic stressors [2]. High-yielding varieties of bread wheat could account for up to 90% of wheat grown around the world in the 21st century [3]. However, only a limited number of local varieties, many of which are closely interrelated, can be used as breeding materials, which narrows down the gene pool of bread wheat [4]. For this reason, taxa that are closely related to T. aestivum are increasingly used for the creative breeding of new varieties with desirable agronomic traits, high nutritional value, high processing suitability, as well as resistance to the most dangerous fungal pathogens [5]. Hexaploid spelt (Triticum spelta L.) is one of such taxa. It is believed that spelt evolved into bread wheat through multiple mutations [6]. There are practically no crossing barriers between the two species, which enables the production of fertile and stable hybrids that can be characterized by higher quality grain and greater resistance to pathogens than bread wheat. Allohexaploid spelt, closely related to bread wheat, has a similar genetic structure to T. aestivum. At present, spelt is produced mainly in organic farms because it has lower agronomic requirements than bread wheat and can be grown in areas with less favorable soil and climate conditions. Selected morphological traits of spelt, including non-free-threshing spikelets, low spike density, and genetic polymorphism of different populations contribute to its resistance to fungal pathogens [7,8].
Powdery mildew and leaf rust are the most ubiquitous foliar diseases of spring wheat in Central Europe. Global food security could be compromised by fungal diseases in wheat farms, which is why efforts are being made to screen new breeding materials for sources of resistance to these diseases. Powdery mildew caused by Blumeria graminis (DC.) E.O. Speer f. sp. tritici Em. Marchali (Bgt) and leaf rust caused by Puccinia triticina Eriks. (Prt) are among the most dangerous diseases of wheat. Infections caused by B. graminis f. sp. tritici and P. triticina can decrease yields by as much as 14%-60% [9].
Resistant cultivars of wheat continue to attract growing interest as the most economical and environmentally-friendly approach to disease control, which eliminates fungicides and minimizes yield losses caused by fungal diseases [10]. The use of molecular markers in analyses of potential breeding materials enables rapid screening of plant genotypes.
In genetic terms, plants possess qualitative and quantitative resistance to pathogens, which is conditioned by major gene or multiple genes. In most cases, resistance to powdery mildew and leaf rust is encoded monogenically in wheat. However, pathogens can easily overcome single-gene resistance. Therefore, wheat breeders are searching for the most effective methods of combining resistance genes in the gene pyramiding process. This broad-spectrum technique is applied to increase the durability of crop resistance to plant pathogens [11]. Breeding materials have to be screened for markers linked to Pm and Lr genes, which encode resistance to infections caused by B. graminis f. sp. tritici and P. triticina, respectively. To date, more than 77 formal Pm genes and more than 30 temporarily designated genes (such as PmYB or PmWFJ) have been identified in 56 chromosomal loci in bread wheat [12,13]. Most Pm genes are localized on the chromosomes of A- and B-genomes (46.2% and 35.1% of all Pm genes, respectively). The Pm genes mapped on chromosomes 1D-2D and 5D-7D account for 18.7% of all Pm genes. The mean number of powdery mildew resistance gene alleles has been determined as 3 in the A-genome, 1.19 in the B-genome, and 1.31 in the D-genome, which clearly indicates that every Pm locus in the A-genome of bread wheat contains a higher number of alleles than the corresponding loci in B- and D- genomes [13]. Genes encoding resistance to powdery mildew have multi-allelic sites, where selected Pm genes that respond differently to Bgt isolates are located at the same locus in different genotypes. Such genes include Pm1 (Pm1a-1e), Pm2 (Pm2a-2c, PmX3986-2, PmWFJ, PmD57-5D, PmLX66 and other), Pm3 (Pm3a-3j), Pm4 (Pm4a-4e), Pm5 (Pm5a-Pm5e) and Pm24 (Pm24a-Pm24b) [14,15]. The presence of many alleles of the Pm gene in the wheat genome constitutes a genetic base for increased resistance to powdery mildew. Some of the mentioned genes are considered as effective. During the evaluation of the putative resistance genes in wheat bread, other factors should be also considered, e.g., the number of Bgt isolates virulent to particular gene. An example is Pm2a, which is believed not to be highly effective against Bgt isolates. Despite the above, the number of Bgt isolates virulent to Pm2a remained relatively low in some parts of the world [16]; thus, this allele can be used in breeding studies. The investigated in this study marker for the Pm3d allele has been identified mostly in European cultivars of bread wheat. To date, its presence has been confirmed in Nordic cultivars of spring wheat [17,18], including Zebra, as well as breeding materials originating from Germany, the UK, and the Netherlands [17]. According to Li et al. [19], the Pm3d allele is gradually disappearing from bread wheat populations. The Pm4 locus is one of the most widely recognized loci of genetic resistance to powdery mildew, which exists alone or in combination with other powdery mildew resistance genes in many resistant cultivars of wheat [20]. The Pm4a resistance allele has been used in breeding efforts for several decades [20,21]. However, research suggests that this locus ceased to confer resistance in wheat growing areas such as Central and Eastern Europe, south-west China and the USA [21].
To date, over 80 leaf rust resistance genes have been described [22]. Most Lr genes are located on the short arm of chromosome 2B [23], and much fewer Lr genes are found on the chromosomes of the A-genome [24]. Most of these genes confer race-specific resistance. However, quick pathogen adaptation may result in the breakdown of Lr resistance genes [25]. The above shift the focus in resistance breeding from race-specific/qualitative resistance (R-gene resistance) conditioned by a single large-effect gene to non-race-specific/quantitative resistance. Polygenic resistance is conditioned by many small-effect genes in the genome, which contribute to the achievement of durable resistance.
To counteract the global threat of powdery mildew and leaf rust, systematic efforts are being made to screen new breeding materials for resistance genes. Genetic similarity resulting from the same number of chromosomes (2n = 6x = 42) and considerable homology between bread wheat and spelt chromosomes creates new opportunities for developing stabile and high-yielding hybrids [26]. Breeding programs require diverse genetic material as a source of genes encoding agriculturally desirable traits. Cultivars Torka and Zebra are elite wheat cultivars (E) with the highest flour strength and high protein content, whereas Kontesa is a high-yielding cultivar of quality class A [27]. In principle, such hybrids constitute valuable breeding materials, including in resistance breeding. These efforts gave rise to hybrids between spelt breeding lines and bread wheat cultivars. The relevant research is also being carried out by the Department of Plant Breeding and Seed Production of the University of Warmia and Mazury (UWM) in Olsztyn, Poland [28].
The spelt lines bred by the UWM in Olsztyn differ in morphological traits and certain agronomic traits. A cytogenetic study also revealed differences in the distribution of repetitive sequences, which could indicate that bread wheat and spelt hybrids are genetically variable [26]. The objective of this study was to evaluate the health status of bread wheat and spelt hybrids and their parental forms (three spring wheat cultivars: Torka, Zebra, and Kontesa, and five spelt lines bred by the UWM in Olsztyn: S10, S11, S12, S13 and S14) under field conditions. Selected markers linked to the genes that encode resistance to infections caused by B. graminis f. sp. tritici and P. triticina in wheat were also applied, and their interaction effects on the severity of powdery mildew and leaf rust were determined to select the most valuable wheat-spelt lines.

2. Materials and Methods

The experimental material comprised 72 breeding lines representing 24 F7 and F8 generation hybrids from single crosses between T. spelta x T. aestivum and T. aestivum x T. spelta and their parental forms: spring spelt breeding lines (S10, S11, S12, S13 and S14 selected from a large group of accessions obtained from the National Center for Plant Genetic Resources in Radzików, Poland) characterized by high technological and nutritional properties, selected at the Department of Plant Breeding and Seed Production of the University of Warmia and Mazury in Olsztyn, Poland, and three spring cultivars of bread wheat: two elite cultivars: Torka and Zebra and one bread cultivar—Kontesa (Table 1). The absence of T x S13 cross was caused by significant differences in flowering dates of parental forms. Wheat lines were bulk harvested, in F7 generation classic negative selection has been applied—the plants, which differ significantly from the whole population in terms of phenotypic traits (e.g., spike shape, height etc.), were removed from further analyses.
The bread wheat cultivars have different gene pools. Cultivar Torka is slightly less resistant to leaf rust and powdery mildew than cv. Zebra and cv. Kontesa is characterized by a slightly lower technological value than previously described bread cultivars, nevertheless Kontesa has a relatively high yield making this cultivar interesting for future breeding studies. Spelt lines were previously investigated in terms of possible suitability for nutritional purposes and resistance to fungal pathogens causing FHB (Fusarium Head Blight), powdery mildew and leaf rust. The assessment of health status was conducted during field experiments. Starting the crossing, no molecular analyses were performed to confirm the presence of leaf rust and powdery mildew resistance genes. The parental spelt lines selected from genebank accessions fully meet “true spelt” criteria in terms of phenotypic traits. Three morphologically varied lines were selected under field conditions from each of the 24 groups of sister lines.

2.1. An Evaluation of the Health Status of Wheat-Spelt Breeding Lines and Their Parental Forms

The field experiment was performed at the Agricultural Experiment Station in Bałcyny, Poland (53°36′ N latitude, 19°51′ E longitude). Spelt and wheat were grown and harvested in accordance with good agricultural practices. The field experiment was carried out in a randomized complete block design (RCBD) with three replications. Spikelets (spelt and wheat-spelt lines) or seeds (bread wheat) were sown in triplicate with 10 × 20 cm spacing and were fertilized with N/P/K (nitrogen/phosphorus/potassium) 60/25/80 kg/ha in plots with an area of 6 m2. The severity of powdery mildew and leaf rust was evaluated in plants naturally infected with B. graminis f. sp. tritici and P. triticina in 2017 and 2018. A minimum of 25 plants selected randomly from each object were examined in the flowering stage (BBCH 65) [29,30]. Three leaves from each replicate were collected to evaluate the disease severity based on the average percentage of affected leaf area on the scale proposed by the European and Mediterranean Plant Protection Organization [31].

2.2. Identification of Resistance Genes

DNA was isolated from two-week-old seedlings with the use of the Genomic Micro AX Plant Gravity kit (A&A Biotechnology, Poland). The quantity and quality of DNA were measured with a spectrophotometer (nanoMaestro Gen, Poland) at 260 nm and 280 nm wavelength. The isolated genetic material was stored in TE buffer at −20 °C to prevent DNA degradation. The PCR assay involved the PCR Mix RAPID kit (A&A Biotechnology, Poland) with the appropriate primers. The selected primers were specific for the genes encoding resistance to powdery mildew: Pm2 (Xcfd81-5D, [32]), Pm3d (Pm3d, [17]), Pm4a (Xgwm356, [33]), Pm4b (Me8/Em7-220, STS-241 and Xgwm382-125, [34]), Pm4c (=Pm23) (Xbarc122, [35]), Pm4d (Xgwm526, [33]) and Pm6 (NAU/STSBCD135-2, [34]) (Table 2), and leaf rust: Lr1 (pTAG621, [36]), Lr9 (SCS5550, [37]), Lr10 (Lr10, [38]), Lr24 (SCS73719, [39]), and Lr28 (SCS421570, [40]) (Table 2). Amplifications were conducted in Whatman Biometra T-personal Thermocycler. The amplification conditions for the primer sets for identifying DNA markers linked to resistance genes are listed in Table 3. Gel electrophoresis was conducted in agarose (Blirt, Poland) with ethidium bromide to visualize the amplicons. DNA bands were visualized in the Biogenet DIGIDOC gel imaging system (Biogenet, Poland).

3. Results

3.1. Evaluation of Plant Health in a Field Experiment

The health status of wheat plants was evaluated in the full flowering stage (BBCH 65) in 2017 and 2018. Symptoms of infection were expressed by the percentage of affected leaf area: none—0%–1%, low—2%–30%, high—>30% (P—parental forms, L—breeding lines). In most plants, symptoms of powdery mildew were not observed or were weak in the first year of the experiment. The only exceptions were lines originated from S13 x K, which were characterized by a high percentage of affected leaf area (>30%) (Table 4).
In 2018, the infections were less severe than in the previous year, which could be attributed to different weather conditions High average temperatures and low total precipitation were noted in 2018 (Figure 1). Data were provided by the Meteorological Station in Bałcyny. The infection pattern was similar in both years: cultivars Torka and Zebra and spelt lines S11–S13 showed no symptoms of B. graminis f. sp. tritici infection, and the most infected lines were 23–23″ (S13 x K) (Figure 2).
Wheat leaves were more severely affected by P. triticina than B. graminis f. sp. tritici, but the noted symptoms were regarded as mild. In 2017, the parental lines of T. spelta did not exhibit symptoms of P. triticina infection. Most of the lines were also free of leaf rust symptoms in 2018. Mostly mild disease symptoms were noted in bread wheat in both years of the experiment. Leaf rust was observed in cvs. Torka, Zebra and Kontesa in 2017 and 2018. Line 18′ (S13 × T) was the only wheat-spelt line characterized by high susceptibility to P. triticina infections in both years of the study (Figure 3).

3.2. Identification of Pm Resistance Genes

The amplification products of the following markers were identified in the electropherograms of the studied breeding lines and their parental forms: Pm2a allele, Pm3d allele, Pm4a allele, three markers for the Pm4b allele, Pm4c allele, and Pm6 gene (Figure 4). A PCR product with a size of 140–160 bp linked to the Pm4d allele (Figure 5 and Figure 6) was not observed in any of the studied forms. An analysis of wheat-spelt lines revealed the highest number of markers linked to Pm genes in lines Z × S11 (line 11′) and Z × S12 (line 12), where the presence of markers linked to Pm2a, Pm3d, Pm4a-4c, and Pm6 genes was confirmed (Figure 6).
A PCR product with a size of 283 bp was found in all tested objects, which confirmed the presence of the Pm2a gene marker. Most objects did not harbor the marker for the Pm3d allele, which was identified only in the genome of bread wheat cv. Zebra and in lines where cv. Zebra was the parental form, excluding lines 10′, 12′ and 14″ (Z × S10, Z × S12 and Z × S14, respectively) (Figure 5 and Figure 6). The marker for the Pm4a allele was identified in the genome of spelt lines S11 and S12, and in a large number of lines where S11 and S12 were the parental forms. It should be noted that the presence of the marker for the Pm4a allele was a differentiating factor in the lines derived from a single cross. All parental forms, excluding spelt line S12, harbored all three markers for the Pm4b allele. Line S12 did not contain the STS-241 marker, but the presence of the two remaining markers for the Pm4b allele suggests that the genome of this spelt line harbors the Pm4b gene (Figure 5 and Figure 6). In the parental forms of the evaluated wheat-spelt lines, the marker for the Pm4c allele was identified in the genomes of bread wheat cvs. Torka and Zebra, and in spelt lines S12 and S13 (Figure 5). The marker for the Pm4c allele was also found in most lines derived from the parental forms that harbored this marker. The only exceptions were the lines originating from K × S12 and Z × S14 crosses, where the marker for the Pm4c allele was not identified despite its presence in the parental genome (Figure 6). The marker for the Pm4c allele was not present in the lines originating from S10 × K, S11 × K and S14 × K crosses. The marker for the Pm6 gene was present in the genomes of all parental forms and in all breeding lines (Figure 5 and Figure 6).

3.3. Identification of Lr Resistance Genes

The presence of PCR products with a size of 560 bp, 550 bp, and 719 bp, corresponding to Lr1, Lr9 and Lr24 gene markers, respectively, was not confirmed in any parental forms of the analyzed wheat-spelt lines and in any of the lines (Figure 7). Products corresponding to the Lr10 gene marker were identified in bread wheat cv. Kontesa and in spelt lines S12 and S14. The Lr10 gene marker was found in all wheat-spelt lines whose both parental forms harbored the Lr10 gene, as well as in most of the lines derived from bread wheat cv. Kontesa (Figure 7, Figure 8 and Figure 9). Selected lines originating from crosses between Z × S12, Z × S14, S12 × T, and S14 × T also harbored the Lr10 gene marker. The Lr28 gene marker was identified in the genome of bread wheat cv. Zebra and spelt line S10 (Figure 7). This marker was identified based on the presence of a product with a size of 570 bp, which was found in the lines derived from the above parental forms (Figure 9).

4. Discussion

In this experiment, bread wheat cv. Zebra and spelt line S12 harbored a higher number of markers for genes/alleles encoding resistance to powdery mildew than other parental forms of the analyzed wheat-spelt lines. The marker linked to the Pm2a allele was present in each object, and its frequency was also high in the bread wheat cultivars examined by Kowalczyk et al. [41]. In the present study, the Pm2a allele was identified in all parental spelt lines, which suggests that this allele could be widely distributed in spelt populations. However, further research involving a larger number of genotypes is required to validate this observation. According to Li et al. [19], the Pm3d allele is gradually disappearing from bread wheat populations. The cited authors did not identify the marker for the Pm3d allele in molecular analyses of more than 2500 accessions from 85 countries. In the current study, the frequency of the Pm3d allele was also low in the parental forms of the analyzed wheat-spelt lines.
In Poland, the percentage of B. graminis f. sp. tritici isolates virulent to the Pm4a allele was high (>50%) already in the first years of the 21st century [42]. The absence of the marker for the Pm4a allele in the analyzed bread wheat cultivars suggests that this gene had been gradually withdrawn from breeding programs. All of the evaluated lines and their parental forms contained at least two markers for the Pm4b allele. The majority of Bgt isolates in the world is not virulent to this allele [21]. These findings point to cyclic changes in the population of Bgt isolates. In the early years of the 21st century, Bgt isolates in Poland were highly virulent to cultivars harboring the Pm4b allele [42]. However, the structure of Bgt isolates has not been researched extensively in Poland. The virulence structure of B. graminis f. sp. tritici isolates from triticale was investigated by Czembor et al. [43]. Previous reports had revealed that B. graminis f. sp. tritici expanded its host range from wheat to the closely related triticale [44], which suggests that the pathogen’s virulence structure in wheat populations continues to change. Kowalczyk et al. [45] demonstrated that triticale and bread wheat hybrids containing the Pm4b allele were resistant to Bgt isolates in Poland, which indicates that this allele plays an important role in resistance breeding. The third allele of the Pm4 gene—Pm4c (previously identified as Pm23)—is responsible for broad-spectrum resistance to Bgt isolates [46]. In this study, the Pm4c allele was identified in bread wheat cvs. Torka and Zebra, in spelt lines S12 and S13, and in the genomes of many lines derived from at least one parental form harboring this allele. The presence of several alleles of a given resistance gene in one breeding line or cultivar can significantly expand its resistance spectrum [14]. Therefore, the lines derived from the crosses between Z × S11 and Z × S12, containing a higher number of markers for Pm4 alleles, should theoretically be more resistant to B. graminis f. sp. tritici under field conditions, which was confirmed by the present experiment. The marker for the Pm6 gene was identified in all tested objects, which could be attributed to the fact that this gene has been widely used in breeding programs since the 1980s [47,48].
Zebra was the only bread wheat cultivar that contained the marker for the Pm3d gene, and it also harbored the markers for the Pm2a allele, Pm4b-4c alleles, and the Pm6 gene. There is a general scarcity of research of the structure of genes conditioning resistance to Bgt in spelt. Longin et al. [49] reported that spelt was characterized by similar or even higher susceptibility to B. graminis f. sp. tritici infections relative to bread wheat. In view of the above findings, the spelt lines (S10–S14) could constitute valuable material for resistance breeding because none of them displayed symptoms of B. graminis f. sp. tritici infection during the experiment, or the observed symptoms were mild. The genomes of these lines harbored the markers linked to genes and alleles encoding resistance to powdery mildew: Pm2a, Pm4a, Pm4b, Pm4c, and Pm6. Line S12 emerged as an interesting genetic resource due to the presence of markers for Pm2a, Pm4a-4c, and Pm6.
Lines 11′ (Z × S11) and line 12 (Z × S12) appear to be particularly valuable sources of genetic resistance to B. graminis f. sp. tritici because they harbored the markers for Pm2a, Pm3d, Pm4a-4c and Pm6. During the entire experiment, none of these lines exhibited symptoms of powdery mildew under field conditions. These observations suggest that a combination of Pm2 (Pm2a allele), Pm4 (a-c alleles), and Pm6 resistance genes should effectively protect wheat-spelt lines against the disease. However, it is also possible that the presence of one particular resistance allele, e.g., Pm4a or Pm3d, may strongly contribute to field resistance to B. graminis f. sp. tritici given that bread wheat—spelt genotypes and their parental forms characterized by the presence of Pm4a or Pm3d in their genomes were without infection during field experiment regardless of the gene combination.
In the current study, three of the eight parental forms (cv. Kontesa and spelt lines S12 and S14) harbored the Lr10 marker (seedling resistance gene), whereas the Lr28 marker was identified in cv. Zebra and spelt line S10. The genetic basis of resistance in the studied cereals was limited to only these two genes. The investigated cultivars and breeding lines were also screened for Lr1, Lr9 and Lr24 resistance markers whose effectiveness had been previously demonstrated in both field and greenhouse experiments [50]. However, none of these markers were identified in the studied plant material. The health status assessment conducted in this experiment revealed that spelt was highly resistant to P. triticina infections. However, spelt lines S10, S11, and S13 probably contained also other resistance genes than those identified in this study, i.e., Lr1, Lr9, Lr10, Lr24, and Lr28. Lines 5′, 12 and 20 (K × S10, Z × S12, and S10 × K, respectively) harbored the markers for both Lr10 and Lr28. Most importantly, most of these lines do not displayed symptoms of leaf rust or displayed low level of symptoms (breeding line 12) during the two-year study. According to Tomkowiak et al. [51] Lr10 and Lr28 genes encode broad-spectrum resistance to various races of P. triticina in Europe and Central Asia. Leśniowska-Nowak et al. [52] also noted that the Lr10 gene is widely used in Polish breeding programs.
Based on the evaluated combinations of genes encoding resistance to Bgt and Prt, line 12 (Z × S12) emerged as the most promising accessions harboring the highest number of markers for genes and alleles that confer resistance to the infections caused by these pathogens. Line 12 was also highly resistant to powdery mildew and leaf rust under field conditions. In the group of true spelt lines, line S12 appears to be particularly well suited for resistance breeding. Several genes and alleles encoding resistance to powdery mildew (Pm2a, Pm4a, Pm4b, Pm4c, and Pm6) and leaf rust (Lr10) were identified in the genome of line S12. This spelt line was also highly resistant to B. graminis f. sp. tritici and P. triticina in both years of the field experiment. Several of the phenotypically homogenous wheat-spelt lines were characterized by high resistance to both pathogens in the field, mostly the lines derived from the crosses between Z × S12, Z × S11, Z × S14, S11 × T. These objects constitute sources of genetic material for broad-spectrum resistance breeding. This study also demonstrated that the genetic sources of resistance to Bgt and Prt were similar in bread wheat and spelt. Therefore, both species can be used to obtain new breeding materials and develop bread wheat cultivars whose genetic composition not only guarantees high nutritional value and desirable technological properties of grain, but also high resistance to fungal pathogens. Triticum spelta can also be a valuable donor of resistance genes that can be used in the pyramidization process. Further research involving a larger number of T. spelta accessions and varieties is needed to identify Bgt and Lrt resistance genes. True spelt lines S10–S14 that had been previously used for simple crossing were selected from a large number of genebank accessions based on their technological suitability (yield, resistance to lodging, resistance to pathogens) because the main aim of research efforts was to obtain simple crosses and lines for further creative breeding. It appears that some of the genebank accessions of T. spelta, characterized by less desirable agronomic and performance traits, may harbor interesting resistance genes. However, further research focusing on resistance breeding is needed to validate this assumption.

Author Contributions

Conceptualization, K.G.-D. and M.W.; methodology, K.G.-D., A.D., and E.S.; software, E.S. and M.W.; validation, K.G.-D., A.D., E.S., and M.W.; formal analysis, K.G.-D. and A.D.; investigation, K.G.-D. and A.D.; resources, M.W. and E.S; data curation, K.G.-D. and M.W.; writing—original draft preparation, K.G.-D. and A.D.; writing—review and editing, K.G.-D. and A.D.; visualization, K.G.-D.; supervision, M.W.; project administration K.G.-D. and M.W.; funding acquisition, K.G.-D. and M.W. All authors have read and agreed to the published version of the manuscript.

Funding

This research was funded by the National Science Centre in Poland (project Preludium 14 [2017/27/N/NZ9/00058]).

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Weather conditions in the growing seasons of 2016/2017 and 2017/2018.
Figure 1. Weather conditions in the growing seasons of 2016/2017 and 2017/2018.
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Figure 2. Symptoms of B. graminis f. sp. tritici infection on the leaves of the analyzed wheats A—cv. Torka, B—cv. Zebra, C—cv. Kontesa, D—spelt line S11, E—spelt line S12, F—spelt line S13, G—wheat x spelt line 23 (S13 × K).
Figure 2. Symptoms of B. graminis f. sp. tritici infection on the leaves of the analyzed wheats A—cv. Torka, B—cv. Zebra, C—cv. Kontesa, D—spelt line S11, E—spelt line S12, F—spelt line S13, G—wheat x spelt line 23 (S13 × K).
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Figure 3. Symptoms of leaf rust caused by P. triticina on the leaves of bread wheat cv. Torka (A) and spelt-wheat line 18′ (S13 × T) (B).
Figure 3. Symptoms of leaf rust caused by P. triticina on the leaves of bread wheat cv. Torka (A) and spelt-wheat line 18′ (S13 × T) (B).
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Figure 4. Identification of Pm gene markers in exemplary genotypes. Key: A (Pm2a): lane 1—S10, lane 2—cv. Zebra, lane 3—Z × S11 (breeding line 11), B (Pm3d): lane 1—cv. Zebra, C (Pm4a): lane 1—S11, lane 2—Z × S11 (breeding line 11), lane 3—Z × S12 (breeding line 12″), D (Pm4b): lane 1—S10, lane 2—S11, lane 3—Z × S11 (breeding line 11), lane 4—S10 × K (breeding line 20), E (Pm4c): lane 1—S12, lane 2—Z × S11 (breeding line 11′), lane 3—Z × S12 (breeding line 12), F (Pm6): lane 1—cv. Kontesa, lane 2—S10 x K (breeding line 20).
Figure 4. Identification of Pm gene markers in exemplary genotypes. Key: A (Pm2a): lane 1—S10, lane 2—cv. Zebra, lane 3—Z × S11 (breeding line 11), B (Pm3d): lane 1—cv. Zebra, C (Pm4a): lane 1—S11, lane 2—Z × S11 (breeding line 11), lane 3—Z × S12 (breeding line 12″), D (Pm4b): lane 1—S10, lane 2—S11, lane 3—Z × S11 (breeding line 11), lane 4—S10 × K (breeding line 20), E (Pm4c): lane 1—S12, lane 2—Z × S11 (breeding line 11′), lane 3—Z × S12 (breeding line 12), F (Pm6): lane 1—cv. Kontesa, lane 2—S10 x K (breeding line 20).
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Figure 5. Identification of gene markers associated with wheat resistance to B. graminis f. sp. tritici in bread wheat cultivars and five spelt lines as the parental forms of bread wheat-spelt breeding lines.
Figure 5. Identification of gene markers associated with wheat resistance to B. graminis f. sp. tritici in bread wheat cultivars and five spelt lines as the parental forms of bread wheat-spelt breeding lines.
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Figure 6. Identification of gene markers associated with wheat resistance to B. graminis f. sp. tritici in bread wheat and spelt lines Key: T—cv. Torka, Z—cv. Zebra, K—cv. Kontesa, N—null lines (e.g., T x S10 is abbreviated as 1), P—prim lines (e.g., T x S10′ is abbreviated as 1′), B—bis lines (e.g., T x S10″ is abbreviated as 1″).
Figure 6. Identification of gene markers associated with wheat resistance to B. graminis f. sp. tritici in bread wheat and spelt lines Key: T—cv. Torka, Z—cv. Zebra, K—cv. Kontesa, N—null lines (e.g., T x S10 is abbreviated as 1), P—prim lines (e.g., T x S10′ is abbreviated as 1′), B—bis lines (e.g., T x S10″ is abbreviated as 1″).
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Figure 7. Identification of gene markers associated with wheat resistance to P. triticina in bread wheat cultivars and five spelt as the parental forms of bread wheat-spelt breeding lines.
Figure 7. Identification of gene markers associated with wheat resistance to P. triticina in bread wheat cultivars and five spelt as the parental forms of bread wheat-spelt breeding lines.
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Figure 8. Identification of gene markers associated with wheat resistance to P. triticina in bread wheat and spelt lines Key: T—cv. Torka, Z—cv. Zebra, K—cv. Kontesa, N—null lines (e.g., T × S10 is abbreviated as 1), P—prim lines (e.g., T × S10′ is abbreviated as 1′), B—bis lines (e.g., T × S10″ is abbreviated as 1″).
Figure 8. Identification of gene markers associated with wheat resistance to P. triticina in bread wheat and spelt lines Key: T—cv. Torka, Z—cv. Zebra, K—cv. Kontesa, N—null lines (e.g., T × S10 is abbreviated as 1), P—prim lines (e.g., T × S10′ is abbreviated as 1′), B—bis lines (e.g., T × S10″ is abbreviated as 1″).
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Figure 9. Identification of Lr gene markers in exemplary genotypes. Key: T—cv. Torka, Z—cv. Zebra, K—cv. Kontesa, (A) (Lr10): lane 1—cv. Kontesa, lane 2—S12, lane 3—K × S10 (breeding line 5); (B) (Lr28): lane 1—cv. Zebra, lane 2—S10, lane 3—Z × S12 (breeding line 12).
Figure 9. Identification of Lr gene markers in exemplary genotypes. Key: T—cv. Torka, Z—cv. Zebra, K—cv. Kontesa, (A) (Lr10): lane 1—cv. Kontesa, lane 2—S12, lane 3—K × S10 (breeding line 5); (B) (Lr28): lane 1—cv. Zebra, lane 2—S10, lane 3—Z × S12 (breeding line 12).
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Table
Table 1. Breeding lines and parental forms analyzed in the study.
Table 1. Breeding lines and parental forms analyzed in the study.
ObjectOriginBreeding Line
1T × S101, 1′, 1″
2T × S112, 2′, 2″
3T × S123, 3′, 3″
4T × S144, 4′, 4″
5K × S105, 5′, 5″
6K × S116, 6′, 6″
7K × S127, 7′, 7″
8K × S138, 8′, 8″
9K × S149, 9′, 9″
10Z × S1010, 10′, 10″
11Z × S1111, 11′, 11″
12Z × S1212, 12′, 12″
13Z × S1313, 13′, 13″
14Z × S1414, 14′, 14″
15S10 × T15, 15′, 15″
16S11 × T16, 16′, 16″
17S12 × T17, 17′, 17″
18S13 × T18, 18′, 18″
19S14 × T19, 19′, 19″
20S10 × K20, 20′, 20″
21S11 × K21, 21′, 21″
22S12 × K22, 22′, 22″
23S13 × K23, 23′, 23″
24S14 × K24, 24′, 24″
25N/AT
26N/AK
27N/AZ
28N/AS10
29N/AS11
30N/AS12
31N/AS13
32N/AS14
Key: T—cv. Torka, K—cv. Kontesa, Z—cv. Zebra, S10-S14—spring spelt breeding lines; abbreviations: e.g., T x S10—Torka x S10, etc.
Table
Table 2. Primer sequences for DNA markers linked to powdery mildew and leaf rust resistance genes in wheat.
Table 2. Primer sequences for DNA markers linked to powdery mildew and leaf rust resistance genes in wheat.
DiseaseGeneMarkerSequence 5’->3’ (F)Sequence 5’->3’ (R)Product Size (bp)
Powdery mildewPm2Xcfd81-5DTATCCCCAATCCCCTCTTTCGTCAATTGTGGCTTGTCCCT283
Pm3dPm3dTGACTATTCGTGGGTGCAGACTGCGGCACAGTTCAGC1109
Pm4aXgwm356AGCGTTCTTGGGAATTAGAGACCAATCAGCCTGCAACAAC130
Pm4bMe8/Em7-220TGAGTCCAAACCGGTGCGACTGCGTACGAATTCAA220
STS-241CTCATTCTTGTTTTACTTCCTTCAGTGTCTCGTCTTCAGCATCCTATACA241
Xgwm382-125GTCAGATAACGCCGTCCAATCTACGTGCACCACCATTTTG125
Pm4cXbarc122CCCGTGTATATCCAGGAGTGCAGCCCTTGTGATGTGATG375
Pm4dXgwm526CAATAGTTCTGTGAGAGCTGCGCCAACCCAAATACACATTCTCA140–160 *
Pm6NAU/STSBCD135-2GCTCCGAAGCAAGAGAAGAATCTGCTGGTCCTCTGATGTG135
Leaf rustLr1pTAG621GGGTCACGTACTACTATACCTTGCCAGCCCAAAAG560
Lr9SCS5550TGCGCCCTTCAAAGGAAGTGCGCCCTTCTGAACTGTAT550
Lr10Lr10GTGTAATGCATGCAGGTTCCAGGTGTGAGTGAGTTATG TT310
Lr24SCS73719TCGTCCAGATCAGAATGTGCTCGTCGATTAGCAGTGAG719
Lr28SCS421570ACAAGGTAAGTCTCCAACCAAGTCGACCGAGATTTTAACC570
* primer pair amplifying polymorphic DNA.
Table
Table 3. Amplification conditions for primer sets for identifying DNA markers linked to powdery mildew and leaf rust resistance genes.
Table 3. Amplification conditions for primer sets for identifying DNA markers linked to powdery mildew and leaf rust resistance genes.
DiseaseGeneMarkerCycle Conditions
Powdery mildewPm2Xcfd81-5D94 °C–5 min; 35 cycles (94 °C–30 s; 60 °C–30 s; 72 °C–1 min); 72 °C–10 min
Pm3dPm3d94 °C–3 min; 35 cycles (94 °C–1 min; 58 °C–1 min; 72 °C–1 min); 72 °C–5 min
Pm4aXgwm35694 °C–3 min; 45 cycles (94 °C–1 min; 55 °C–1 min; 72 °C–2 min); 72 °C–10 min
Pm4bMe8/Em7-22094 °C–3 min; 35 cycles (94 °C–40 s; 50 °C–1 min; 72 °C–1 min); 72 °C–5 min
STS-24194 °C–3 min; 35 cycles (94 °C–40 s; 50 °C–1 min; 72 °C–1 min); 72 °C–5 min
Xgwm382-12594 °C–3 min; 35 cycles (94 °C–40 s; 60 °C–1 min; 72 °C–1 min); 72 °C–5 min
Pm4cXbarc12294 °C–3 min; 35 cycles (94 °C–40 s; 52 °C–1 min; 72 °C–1 min); 72 °C–5 min
Pm4dXgwm52694 °C–3 min; 45 cycles (94 °C–1 min; 55 °C–1 min; 72 °C–2 min); 72 °C–10 min
Pm6NAU/STSBCD135-294 °C–4 min; 31 cycles (94 °C–30 s; 55 °C–1 min; 72 °C–1 min); 72 °C–1 min
Leaf rustLr1pTAG62194 °C–5 min; 30 cycles (94 °C–1 min; 55 °C–1 min; 72 °C–2 min); 72 °C–10 min
Lr9SCS555094 °C–2 min; 30 cycles (94 °C–1 min; 60 °C–1 min; 72 °C–1 min); 72 °C–7 min
Lr10Lr1094 °C–3 min; 35 cycles (94 °C–45 s; 57 °C–45 s; 72 °C–30 s); 72 °C–3 min
Lr24SCS7371994 °C–2 min; 35 cycles (94 °C–1 min; 55 °C–1 min; 72 °C–1 min); 72 °C–7 min
Lr28SCS42157094 °C–2 min; 35 cycles (94 °C–1 min; 60 °C–1 min; 72 °C–1 min); 72 °C–5 min
Table
Table 4. The health status of the investigated wheat accessions in two experimental years (2017 and 2018).
Table 4. The health status of the investigated wheat accessions in two experimental years (2017 and 2018).
Powdery MildewLeaf Rust
2017201820172018
ObjectOriginBreeding LineCategoryAverage ScoreCategoryAverage ScoreCategoryAverage ScoreCategoryAverage Score
1T × S101None0%None0%None0%Low5%
1’1%1%1%10%
1’’0%1%1%10%
2T × S112None0%None0%None0%Low5%
2′0%0%0%5%
2″0%0%0%10%
3T × S123None0%None1%Low10%Low10%
3′0%0%None0%15%
3″0%0%None0%10%
4T × S144None1%None0%None1%Low5%
4′1%1%1%5%
4″0%0%1%5%
5K × S105None0%None0%Low5%None0%
5′0%0%None1%1%
5″0%0%None0%0%
6K × S116None0%None0%None1%None1%
6′0%0%Low10%1%
6″0%1%None1% 0%
7K × S127None0%None0%None1%None0%
7′Low10%0%None1%0%
7″Low10%0%Low5%0%
8K × S138None0%None0%None0%None0%
8′1%0%Low10%0%
8″0%1%Low5%0%
9K × S149None0%None0%None0%Low5%
9′1%0%None0%None0%
9″1%0%High35%Low15%
10Z × S1010None0%None0%Low5%None0%
10′0%0%10%0%
10″0%0%10%0%
11Z × S1111None0%None0%Low5%None1%
11′1%0%5%1%
11″0%0%5%1%
12Z × S1212None0%None0%Low5%None0%
12′0%Low10%5%0%
12″0%None1%5%1%
13Z × S1313None0%None0%None0%Low10%
13′0%0%0%Low10%
13″1%0%1%None0%
14Z × S1414None0%None0%None0%None1%
14′1%1%0%0%
14″0%1%0%1%
15S10 × T15None0%Low10%None0%None0%
15′0%Low5%1%0%
15″0%None0%0%1%
16S11 × T16None0%None1%None1%None0%
16′1%0%1%1%
16″0%0%1%1%
17S12 × T17None0%None0%None1%None0%
17′0%1%0%0%
17″0%0%0%1%
18S13 × T18Low5%None1%None1%None1%
18′5%1%High35%High60%
18″10%1%None1%Low10%
19S14 × T19Low10%None0%None0%Low10%
19′15%1%Low5%15%
19″10%1%None1%5%
20S10 × K20Low5%None1%None0%None0%
20′5%1%1%0%
20″5%1%1%1%
21S11 × K21None0%None0%None1%None1%
21′0%1%1%1%
21″0%0%1%1%
22S12 × K22None0%None0%Low5%None1%
22′1%0%None0%1%
22″0%1%Low10%1%
23S13 × K23High40%Low5%High30%Low15%
23′35%15%40%15%
23″40%5%35%20%
24S14 × K24None1%Low5%High30%Low10%
24′0%15%None1%None1%
24″0%20%None1%None1%
25N/ATNone1%None1%High30%Low5%
26ZNone0%None0%Low5%Low10%
27KLow10%Low5%Low10%Low15%
28S10Low10%None0%None0%None0%
29S11None0%None0%None0%None0%
30S12None0%None0%None0%None0%
31S13None0%None0%None0%Low10%
32S14Low15%None0%None0%None0%

Share and Cite

MDPI and ACS Style

Goriewa-Duba, K.; Duba, A.; Suchowilska, E.; Wiwart, M. An Analysis of the Genetic Diversity of Bread Wheat x Spelt Breeding Lines in Terms of Their Resistance to Powdery Mildew and Leaf Rust. Agronomy 2020, 10, 658. https://doi.org/10.3390/agronomy10050658

AMA Style

Goriewa-Duba K, Duba A, Suchowilska E, Wiwart M. An Analysis of the Genetic Diversity of Bread Wheat x Spelt Breeding Lines in Terms of Their Resistance to Powdery Mildew and Leaf Rust. Agronomy. 2020; 10(5):658. https://doi.org/10.3390/agronomy10050658

Chicago/Turabian Style

Goriewa-Duba, Klaudia, Adrian Duba, Elżbieta Suchowilska, and Marian Wiwart. 2020. "An Analysis of the Genetic Diversity of Bread Wheat x Spelt Breeding Lines in Terms of Their Resistance to Powdery Mildew and Leaf Rust" Agronomy 10, no. 5: 658. https://doi.org/10.3390/agronomy10050658

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