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Research article2021Peer reviewedOpen access

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

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.


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.


GWAS; resistance screening; Magnaporthe oryzae; Pyricularia oryzae; MoT

Published in

Frontiers in Genetics
2021, Volume: 12, article number: 679162

    Sustainable Development Goals

    End hunger, achieve food security and improved nutrition and promote sustainable agriculture

    UKÄ Subject classification

    Genetics and Breeding

    Publication identifier


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