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ARS Home » Midwest Area » West Lafayette, Indiana » Crop Production and Pest Control Research » Research » Publications at this Location » Publication #402868
Research Project: Fungal Host-Pathogen Interactions and Disease Resistance in Cereal Crops

Location: Crop Production and Pest Control Research

Title: New quantitative trait loci (QTL) for resistance to tar Spot in maize

Author
item Singh, Raksha
item Crane, Charles
item SHIM, SUJOUNG - Purdue University
item TELENKO, DARCY - Purdue University
item Goodwin, Stephen - Steve

Submitted to: International Congress of Plant Pathology Abstracts and Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 6/9/2023
Publication Date: 8/20/2023
Citation: Singh, R., Crane, C.F., Shim, S., Telenko, D.E., Goodwin, S.B. 2023. New quantitative trait loci (QTL) for resistance to tar Spot in maize. International Congress of Plant Pathology Abstracts and Proceedings. ABSTRACT.

Interpretive Summary: N/A

Technical Abstract: Tar spot, is a destructive disease of maize that was first discovered in Central and South America but has spread to the USA and Canada since 2015. During the past several years it has become the most important disease in the Corn Belt of the USA. A major quantitative trait locus (QTL) for resistance to tar spot was identified previously in tropical maize germplasm on chromosome 8 with minor QTL on other chromosomes, but a great need for additional resistance remains. To address this deficiency, progeny from the Nested Association Mapping (NAM) population of maize were selected for phenotypic analysis after a difference was identified between the resistant parent CML52 and the susceptible B73. Phenotyping of 197 recombinant-inbred lines of the CML52 by B73 plus the parents during the 2020 and 2021 growing seasons and analysis with existing molecular markers identified a major QTL on chromosome 9, a moderately strong QTL on chromosome 2 and minor QTL on chromosome 1, 4, 5, 7 and 8. The major QTL on chromosome 9 and many of the minor QTL appear to be novel and potentially provide new source of resistance against the disease. Additional molecular markers in the region containing the QTL on chromosome 9 are being developed and the region is being screened to identify potential candidate genes. Several other NAM parental lines showed strong resistance to tar spot during field trials in north America and could provide a rich source of materials for future breeding programs.