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ARS Home » Southeast Area » Stuttgart, Arkansas » Dale Bumpers National Rice Research Center » Research » Publications at this Location » Publication #418134
Research Project: Broadening and Strengthening the Genetic Base of Rice for Adaptation to a Changing Climate, Crop Production Systems, and Markets

Location: Dale Bumpers National Rice Research Center

Title: Genomic analysis of sheath blight resistance in rice: identifying resistant accessions and key genetic markers

Author
item PEDROZO, RODRIGO - Oak Ridge Institute For Science And Education (ORISE)
item OSAKINA, ARON - Washington University
item NICOLLI, CAMILA - Rice Research And Extension Center
item Jia, Yulin

Submitted to: Meeting Abstract
Publication Type: Proceedings
Publication Acceptance Date: 8/15/2024
Publication Date: 8/15/2024
Citation: Pedrozo, R., Osakina, A., Nicolli, C., Jia, Y. 2024. Genomic analysis of sheath blight resistance in rice: identifying resistant accessions and key genetic markers. Abstract. 2024 International Symposium on Rice Functional Genomics, September 9-11, 2024. Little Rock/Stuttgart, Arkansas.

Interpretive Summary:

Technical Abstract: Sheath blight, caused by Rhizoctonia solani, is a major disease affecting rice (Oryza sativa L.), leading to significant global yield losses. Addressing this issue is crucial for sustainable rice production, given rice’s role as a dietary staple for over two-thirds of the world’s population. This study explores the genetic basis of sheath blight resistance using a diverse panel of 300 rice accessions. Disease reaction assessments were conducted in a greenhouse using the microchamber method, where three seedlings per accession were inoculated with R. solani mycelia. Out of the 300 accessions, 93 exhibited moderate to high resistance, indicating their potential as valuable genetic resources for breeding programs. A field plot experiment is ongoing during the summer of 2024 to validate these findings under natural conditions. Plants will be evaluated for height, type, and susceptibility to sheath blight. The best-performing accessions will be genotyped with the 1k-RiCA SNP panel to identify genes/QTLs associated with resistance. Integrating phenotypic data with genetic loci will facilitate marker-assisted selection, aiding the development of rice varieties with durable resistance to sheath blight.