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POSTERS: Genetics of resistance

Fusarium Root Rot Resistant Genotypes and Genomic Regions Identified in Two Major Common Bean Gene Pools
Shalu Jain - North Dakota State University. Phillip McClean- North Dakota State University, Juan Osorno- Plant Sciences, NDSU, Kristin Simons- Dept of Plant Sciences, North Dakota State University, Atena Oladzad- North Dakota State University, Julie Pasche- Dept of Plant Pathology, North Dakota Sta

Accelerating crop improvement in common bean (Phaselous vulgaris L.), a staple food across many parts of the world, is key to ensuring global nutritional security; however, root rot is a yield limiting constraint worldwide. Identification of resistant lines and genomic regions associated with key resistance genes can facilitate breeding for resistance. The Andean (ADP) and Middle American (MDP) diversity panels, representing common bean genetic diversity from two major gene pools, were screened in the greenhouse for root rot using a mixture of nine Fusarium solani isolates as a source of inoculum. The assay was highly repeatable across five control genotypes based on the relative effects. Lines with high resistance to F. solani were identified in ADP and MDP based on the reaction of the control lines. To identify loci underlying variation related to Fusarium root rot, genome-wide association study was performed on quantitative (disease score and disease index) and qualitative (binary and three class) phenotypic data. Common genomic regions were observed for disease score, disease index and the three-class system on Pv08 and Pv07 in the ADP and MDP, respectively. There were no common significant intervals between ADP and MDP, indicating separate genetic controls for resistance in the two gene pools. The information provides a basis for bean improvement through use of resistant genotypes and marker-assisted breeding for more durable root rot resistance.