Mining alleles for tar spot complex resistance from CIMMYT's maize Germplasm Bank

• DOI: 10.3389/fsufs.2022.937200
• Publication Date: 2022-08-02T06:02:35Z
• Authors: Martha C. Willcox; Juan A. Burgueño; Daniel Jeffers; Enrique Rodriguez...; Armando Guadarram...; Zakaria Kehel; Daniel Chepetla; Rosemary Shrestha; Kelly Swarts; Edward S. Buckler; Sarah Hearne; Charles Chen
• Keywords: Germ plasm

The tar spot complex (TSC) is a devastating disease of maize ( Zea mays L.), occurring in 17 countries throughout Central, South, and North America the Caribbean, can cause grain yield losses up to 80%. As from continue intensify Central America, Phyllachora maydis , one causal pathogens TSC, was first detected United States 2015, 2020 Ontario, Canada. Both distribution due TSC are increasing, there critical need identify genetic resources for resistance. Seeds Discovery Initiative at CIMMYT has sought combine next-generation sequencing technologies phenotypic characterization valuable alleles held Germplasm Bank use germplasm improvement programs. Individual landrace accessions “Breeders' Core Collection” were crossed hybrids form 918 unique topcrosses (F1 families) which evaluated during 2011 2012 reaction. A total 16 associated SNP variants identified foliar leaf damage resistance increased yield. These confirmed by evaluating reaction previously untested selections larger F1 testcross population (4,471 accessions) based on presence favorable SNPs. We demonstrated usefulness mining donor newly emerging diseases using genomic variation landraces.