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Recently Accepted Publications (page 9)
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This addresses USDA-ARS Research Goal: Enhanced understanding of the biochemical pathways and metabolic processes that underpin crop traits and improvement

Youngjae Oh, Seonghee Lee, Renee Arielle Rioux, Pratibha Singh, Melissa H Jia, Yulin Jia, and Kirankumar Mysore. Analysis of Differentially Expressed Rice Genes Reveals the ATP-Binding Cassette (ABC) Transporters as a Candidate Gene Against the Sheath Blight Pathogen, Rhizoctonia solani.  Phytofrontiers  Published September 30, 2021.

Sheath blight disease, caused by the fungus Rhizoctonia solani, is one of the most devastating diseases of rice worldwide.  However, resistance genes and the molecular mechanisms for resistance are not well understood. As a result, control of this disease largely depends on the use of fungicides. In the present study, a field isolate of the pathogen was used to inoculate a resistant rice cultivar ‘Jasmine 85’ allowing identification of 159 plant genes that were “turned on” and involved in the resistance response. Three genes, members of the ABC transporter gene family involved in the transport of substrates across cell membranes, were mapped to known chromosomal regions (QTL) linked with sheath blight resistance. These results suggest that the movement of secondary metabolites and plant hormones that regulate the overall plant development are involved in cells resisting invasion by the sheath blight fungus. Genetic markers were developed from these ABC transporter genes to distinguish between the sheath blight susceptible cultivar ‘Lemont’ and the resistant cultivar Jasmine 85. A random set of 77 progeny derived from a cross between these two cultivars were used to verify the initial findings. The OsABC9 gene, located in a major sheath blight resistance QTL, qShB9-2, showed a major contribution to sheath blight resistance. These results have revealed a specific gene which will be useful in marker assisted selection to develop new sheath blight resistant cultivars and ultimately reduce the need for fungicide applications.


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