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ARS Home » Southeast Area » Stuttgart, Arkansas » Dale Bumpers National Rice Research Center » Research » Publications at this Location » Publication #431479
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: Genome-wide association study for early morning flowering trait in the AUS rice diversity panel

Author
item RANA, PRABHAT - Louisiana State University
item KONDI, RAVI - Louisiana State University
item CHAUDHARY, CHANDERKANT - Louisiana State University
item Rohila, Jai
item SUBUDHI, PRASANTA - Louisiana State University

Submitted to: Rice Technical Working Group Meeting Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 2/17/2025
Publication Date: 1/6/2026
Citation: Rana, P., Kondi, R.K., Chaudhary, C., Rohila, J.S., Subudhi, P.K. 2026. Genome-wide association study for early morning flowering trait in the AUS rice diversity panel. Rice Technical Working Group Meeting Proceedings. New Orleans, Louisiana, February 17-20, 2025.

Interpretive Summary:

Technical Abstract: Early morning flowering in rice is a crucial trait for mitigating the adverse effects of heat stress on grain yield, particularly under changing climatic conditions. A genome-wide association study (GWAS) was conducted in a panel of 197 AUS rice lines to investigate the genetic basis of this trait under controlled conditions. The early morning flowering trait was divided into three distinct time points: early, mid, and late. The phenotypic variation across these categories provided valuable insights into the diversity within the panel. The GWAS identified significant marker-trait associations linked to early morning flowering, revealing genetic loci that could serve as targets for improving this trait. These markers were further analyzed for their potential role in heat stress tolerance and yield enhancement. Candidate genes within significant loci were functionally annotated to explore their involvement in flowering time regulation. The findings from this study highlight the heritable nature of early morning flowering and its genetic determinants. These results provide valuable tools for marker-assisted selection in breeding programs aimed at developing heat-tolerant rice lines with improved grain yield potential, enhancing their adaptability to future heat-stress challenges.