Screening and Mapping for Head Blast Resistance in a Panel of CIMMYT and South Asian Bread Wheat Germplasm

Wheat blast (WB) is a destructive disease in South America and its first outbreak in Bangladesh in 2016 posed a great risk to food security of South Asian countries. A genome wide association study (GWAS) was conducted on a diverse panel of 184 wheat genotypes from South Asia and CIMMYT. Phenotyping...

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Bibliographic Details
Published in:Frontiers in genetics 2021-05, Vol.12, p.679162-679162
Main Authors: He, Xinyao, Juliana, Philomin, Kabir, Muhammad R., Roy, Krishna K., Islam, Rabiul, Marza, Felix, Peterson, Gary, Singh, Gyanendra P., Chawade, Aakash, Joshi, Arun K., Singh, Ravi P., Singh, Pawan K.
Format: Article
Language:English
Subjects:
Genetics
Genetics and Breeding
Genetik och förädling
GWAS
Magnaporthe oryzae
MoT
Pyricularia oryzae
resistance screening
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Summary:Wheat blast (WB) is a destructive disease in South America and its first outbreak in Bangladesh in 2016 posed a great risk to food security of South Asian countries. A genome wide association study (GWAS) was conducted on a diverse panel of 184 wheat genotypes from South Asia and CIMMYT. Phenotyping was conducted in eight field experiments in Bolivia and Bangladesh and a greenhouse experiment in the United States. Genotypic data included 11,401 SNP markers of the Illumina Infinium 15K BeadChip and four additional STS markers on the 2NS/2AS translocation region. Accessions with stable WB resistance across experiments were identified, which were all 2NS carriers. Nevertheless, a dozen moderately resistant 2AS lines were identified, exhibiting big variation among experiments. Significant marker-trait associations (MTA) were detected on chromosomes 1BS, 2AS, 6BS, and 7BL; but only MTAs on 2AS at the 2NS/2AS translocation region were consistently significant across experiments. The resistant accessions identified in this study could be used in production in South Asian countries as a preemptive strategy to prevent WB outbreak.
ISSN:1664-8021
1664-8021
DOI:10.3389/fgene.2021.679162