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Article

Identification of QTLs for Spot Blotch Resistance in Two Bi-Parental Mapping Populations of Wheat

by
Navin C. Gahtyari
1,
Chandan Roy
2,
Xinyao He
3,
Krishna K. Roy
4,
Mohamed M. A. Reza
4,
Md. A. Hakim
4,
Paritosh K. Malaker
4,
Arun K. Joshi
5 and
Pawan K. Singh
3,*
1
ICAR—Vivekanand Parvatiya Krishi Anushandhan Sansthan, Almora, Uttarakhand 263601, India
2
Department of Plant Breeding and Genetics, Bihar Agricultural University, Sabour, Bihar 813210, India
3
International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal 6-641, 06600 Mexico DF, Mexico
4
Bangladesh Wheat and Maize Research Institute (BWMRI), Nashipur, Dinajpur 5200, Bangladesh
5
CIMMYT/Borlaug Institute for South Asia, NASC Complex, DPS Marg, New Delhi 110012, India
*
Author to whom correspondence should be addressed.
Plants 2021, 10(5), 973; https://doi.org/10.3390/plants10050973
Submission received: 1 April 2021 / Revised: 11 May 2021 / Accepted: 11 May 2021 / Published: 13 May 2021
(This article belongs to the Special Issue Genetic Diversity and Molecular Breeding in Plants)
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Abstract

Spot blotch (SB) disease caused by the hemibiotrophic pathogen Bipolaris sorokiniana inflicting major losses to the wheat grown in warm and highly humid areas of the Indian subcontinent, including Bangladesh, necessitates identification of QTLs stably expressing in Indian subcontinent conditions. Thus, two RIL mapping populations, i.e., WC (WUYA × CIANO T79) and KC (KATH × CIANO T79), were phenotyped at Dinajpur, Bangladesh for three consecutive years (2013-2015) and genotyped on a DArTseq genotyping by sequencing (GBS) platform at CIMMYT, Mexico. In both populations, quantitative inheritance along with transgressive segregation for SB resistance was identified. The identified QTLs were mostly minor and were detected on 10 chromosomes, i.e., 1A, 1B, 2A, 2B, 2D, 4B, 4D, 5A, 5D, and 7B. The phenotypic variation explained by the identified QTLs ranged from 2.3–15.0%, whereby QTLs on 4B (13.7%) and 5D (15.0%) were the largest in effect. The identified QTLs upon stacking showed an additive effect in lowering the SB score in both populations. The probable presence of newly identified Sb4 and durable resistance gene Lr46 in the identified QTL regions indicates the importance of these genes in breeding for SB resistance in Bangladesh and the whole of South Asia.
Keywords: Triticum aestivum; Bipolaris sorokiniana; QTLs; disease resistance; Sb4; Lr46 Triticum aestivum; Bipolaris sorokiniana; QTLs; disease resistance; Sb4; Lr46
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MDPI and ACS Style

Gahtyari, N.C.; Roy, C.; He, X.; Roy, K.K.; Reza, M.M.A.; Hakim, M.A.; Malaker, P.K.; Joshi, A.K.; Singh, P.K. Identification of QTLs for Spot Blotch Resistance in Two Bi-Parental Mapping Populations of Wheat. Plants 2021, 10, 973. https://doi.org/10.3390/plants10050973

AMA Style

Gahtyari NC, Roy C, He X, Roy KK, Reza MMA, Hakim MA, Malaker PK, Joshi AK, Singh PK. Identification of QTLs for Spot Blotch Resistance in Two Bi-Parental Mapping Populations of Wheat. Plants. 2021; 10(5):973. https://doi.org/10.3390/plants10050973

Chicago/Turabian Style

Gahtyari, Navin C., Chandan Roy, Xinyao He, Krishna K. Roy, Mohamed M. A. Reza, Md. A. Hakim, Paritosh K. Malaker, Arun K. Joshi, and Pawan K. Singh. 2021. "Identification of QTLs for Spot Blotch Resistance in Two Bi-Parental Mapping Populations of Wheat" Plants 10, no. 5: 973. https://doi.org/10.3390/plants10050973

APA Style

Gahtyari, N. C., Roy, C., He, X., Roy, K. K., Reza, M. M. A., Hakim, M. A., Malaker, P. K., Joshi, A. K., & Singh, P. K. (2021). Identification of QTLs for Spot Blotch Resistance in Two Bi-Parental Mapping Populations of Wheat. Plants, 10(5), 973. https://doi.org/10.3390/plants10050973

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