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ARS Home » Southeast Area » Raleigh, North Carolina » Plant Science Research » Research » Publications at this Location » Publication #370853
Research Project: Genetics of Disease Resistance and Food Quality Traits in Corn

Location: Plant Science Research

Title: Genome-wide association analysis of the strength of the MAMP-elicited defense response and resistance to target leaf spot in sorghum

Author
item SAMIRA, ROZALYNNE - North Carolina State University
item KIMBALL, JENNIFER - University Of Minnesota
item SAMAYOA-LOPEZ, LUIS - North Carolina State University
item Holland, Jim - Jim
item JAMANN, TIFFANY - University Of Illinois
item BROWN, PATRICK - University Of California
item STACEY, GARY - University Of Missouri
item Balint-Kurti, Peter

Submitted to: Scientific Reports
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 10/1/2020
Publication Date: 11/1/2020
Citation: Samira, R., Kimball, J.A., Samayoa-Lopez, L.F., Holland, J.B., Jamann, T.M., Brown, P.J., Stacey, G., Balint Kurti, P.J. 2020. Genome-wide association analysis of the strength of the MAMP-elicited defense response and resistance to target leaf spot in sorghum. Scientific Reports. https://doi.org/10.1038/s41598-020-77684-w.
DOI: https://doi.org/10.1038/s41598-020-77684-w

Interpretive Summary: We examined variation in resistance to a fungal foliar disease and in the basal defense response in a large diverse sorghum population. We identified several loci associated with variation in these traits.

Technical Abstract: Plants have the capacity to respond to conserved molecular features known as microbe-associated molecular patterns (MAMPs). The goal of this work was to assess variation in the MAMP response in sorghum, to map loci associated with this variation and to investigate possible connections with variation in quantitative disease resistance. Using an assay that measures the production of reactive oxygen species, we assessed variation in the MAMP response in a sorghum association mapping population known as the sorghum conversion population (SCP). We identified consistent variation for the response to chitin and flg22 -an epitope of flagellin. Two SNP loci were significantly associated with variation in the flg22 response and one with the chitin response. We also assessed resistance to Target Leaf Spot (TLS) disease caused by the necrotrophic fungus Bipolaris cookei in the SCP. We identified one strong association on chromosome 5 near a previously characterized disease resistance gene. A moderately significant correlation was observed between stronger flg22 response and lower TLS resistance. Possible reasons for this are discussed.