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Seminar: Anju Pandey: Exploring a Novel Source of Resistance to Septoria Leaf Spot for Organic Tomato Production
November 13, 2023 | 9:00 am - 10:00 am
Date: Monday, November 13, 2023
Time: 9:00 am
Speaker: Anju Pandey, PhD Introduction Seminar
Title: Exploring a Novel Source of Resistance to Septoria Leaf Spot for Organic Tomato Production
Host: Dr. Dilip Panthee
Location: 121 Kilgore / Hybrid
Join Zoom Meeting: https://ncsu.zoom.us/j/91000011461?pwd=MWE5TndsdS84WWgzcml6UHNhU0IwUT09
Meeting ID: 910 0001 1461
Septoria leaf spot (SLS) of tomatoes caused by Septoria lycopersici, is a persistent threat to tomato production systems, resulting in substantial economic losses in North Carolina, the northeastern United States, and Canada. Although fungicides have significantly reduced disease epidemics, planting resistant cultivars remains the most economical and effective tool to mitigate this disease in the organic production system. Conventional breeding efforts identified novel resistance sources mostly from wild relatives. At present, we still have inadequate information published on the molecular basis of tomato –S. lycopersici interactions. To mitigate this disease, there is an urgent need to discover SLS resistance genes to develop new tomato cultivars. This study evaluated a panel of 216 advanced tomato breeding lines from NC State University (NCSU) tomato breeding program and wild relatives from the USDA tomato germplasm collection to identify the genetic loci responsible for Septoria resistance in tomato seedlings under greenhouse conditions. From this study, 35 resistant accessions were identified, and the resistance was validated in the field conditions. We will use a genome-wide association study (GWAS) to identify single nucleotide polymorphism (SNP) markers associated with effective resistance genes using genotyping-by-sequencing (GBS) and further confirmed using RNA-seq data. This study is expected to advance our understanding of the genetic architecture for SLS resistance and molecular markers associated with resistance loci that will be useful in tomato breeding programs to develop durable resistance to SLS.