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Keywords = QTL tuber resistance

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13 pages, 1084 KiB  
Article
Quantitative Trait Loci for Resistance to Potato Dry Rot Caused by Fusarium sambucinum
by Sylwester Sobkowiak, Marta Janiszewska, Emil Stefańczyk, Iwona Wasilewicz-Flis and Jadwiga Śliwka
Agronomy 2022, 12(1), 203; https://doi.org/10.3390/agronomy12010203 - 14 Jan 2022
Cited by 5 | Viewed by 2947
Abstract
Tuber dry rot is an important disease of potato caused by soil and seed-borne pathogens of the Fusarium genus leading to losses that may reach 60% of the yield. The goal of this work was to study the inheritance of the dry rot [...] Read more.
Tuber dry rot is an important disease of potato caused by soil and seed-borne pathogens of the Fusarium genus leading to losses that may reach 60% of the yield. The goal of this work was to study the inheritance of the dry rot resistance in two diploid potato hybrid populations (11–36 and 12–3) with complex pedigrees, including several wild Solanum spp. We used an aggressive isolate of F. sambucinum for phenotyping both progenies, parents, and standard potato cultivars in laboratory tuber tests, in three subsequent years. The QTL for dry rot resistance were mapped by interval mapping on existing genetic maps of both mapping populations. The most important and reproducible QTL for this trait was mapped on chromosome I and additional year- and population-specific QTL were mapped on chromosomes II, VII, IX, XI, and XII, confirming polygenic control of this resistance. This is the first study mapping the loci affecting tuber dry rot resistance in potato genome that can contribute to better understanding of potato-F. sambucinum interaction and to more efficient breeding of resistant potato cultivars. Full article
(This article belongs to the Section Crop Breeding and Genetics)
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14 pages, 1046 KiB  
Article
QTL Mapping for Resistance to Early Blight in a Tetraploid Potato Population
by Firuz Odilbekov, Catja Selga, Rodomiro Ortiz, Aakash Chawade and Erland Liljeroth
Agronomy 2020, 10(5), 728; https://doi.org/10.3390/agronomy10050728 - 19 May 2020
Cited by 19 | Viewed by 5013
Abstract
Early blight of potato, caused by Alternaria solani, is an economically important foliar disease in most potato-growing regions. Growing cultivars with higher levels of resistance to early blight can reduce tuber yield losses and the need for fungicide applications. In this research, [...] Read more.
Early blight of potato, caused by Alternaria solani, is an economically important foliar disease in most potato-growing regions. Growing cultivars with higher levels of resistance to early blight can reduce tuber yield losses and the need for fungicide applications. In this research, a bi-parental tetraploid potato population, segregating for resistance to early blight in leaves and tubers, was characterized to identify novel quantitative trait loci (QTL) associated with foliar and tuber early blight resistance. Assessment of the disease resistance in the foliage was performed by field evaluation and in tuber under controlled conditions. Results from this study revealed significant differences (P < 0.001) in resistance to A. solani among potato clones both in the leaves and in tubers. There was no statistically significant correlation (r = 0.06, P = 0.35) between the resistance scores from leaves and tubers. Several clones exhibited; however, high levels of resistance both in leaves and tubers and are; thus, promising candidates for breeding for early blight resistance. Linkage mapping revealed several QTL for early blight affecting both foliage and tubers. QTL associated with disease resistance in the tuber were found on chromosomes 1, 2, 3, 4, 8, 11 and 12. QTL associated with disease resistance in foliage were also examined for independence from defoliation, and independent QTL were; thus, found on chromosomes 5 and 11. Full article
(This article belongs to the Section Crop Breeding and Genetics)
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