Vol. 10, Issue 6 (2021)

Author(s):
Raveendran Muthurajan, Veera Ranjani Rajagopalan, Rohit Kambale, Bharathi Ayyenar and Vignesh Mohanavel

Abstract:
Heat stress, one of the severe hazard to global food security as a result of a rapidly warming climate. Even though, rice being the most important staple food crop for more than half of the world’s population, heat stress often reduces the quantity and quality of rice. In the view of rapidly increasing world’s population there is an urgent need to increase grain yield under drastic varying climatic conditions, especially to breed heat tolerant rice cultivars. Rice production is extremely sensitive to heat stress, since its yield is reduced by increasing temperature. Many genes have been reported for heat tolerance in rice, but their novel allelic variation for breeding heat tolerant rice varieties remain unclear. Therefore, in the present study, attempts were made to identify the allelic variation for the heat responsive ONAC129in 3K RG (Rice genome) panel subset. A set of 201 aus accessions from 3K rice genome project were accessed for the allelic variation. ONAC129 (LOC_Os11g31380), a heat stress responsive NAC transcription factor which play a significant role in rice grain filling. Allelic diversity analysis identified 74 SNPs and 30 INDELs in ONAC129 gene. In this study, four haplotypes (H1, H2, H3 and H4) were identified for ONAC129 based on 18 non synonymous SNPs.