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ARS Home » Southeast Area » Stuttgart, Arkansas » Dale Bumpers National Rice Research Center » Research » Publications at this Location » Publication #403349
Research Project: Gene Discovery and Crop Design for Current and New Rice Management Practices and Market Opportunities

Location: Dale Bumpers National Rice Research Center

Title: Towards understanding heat stress tolerance in rice using a chromosomal segment substitution library

Author
item Rohila, Jai

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 3/17/2023
Publication Date: 3/27/2023
Citation: Rohila, J.S. 2023. Towards understanding heat stress tolerance in rice using a chromosomal segment substitution library. American Society of Plant Biologists Souther Section Meeting, Fayetteville, Arkansas. March 25-27, 2023.

Interpretive Summary:

Technical Abstract: Rice is an important cereal crop for world’s food security as billions of people around the globe use it as their staple food. Increasing ambient temperatures during recent years have shown that it is sensitive to heat stress and as a result the rice produced has lower grain yield and quality, and eventually affect agricultural or bioeconomy of the US, and food security around the globe. To understand the complex stoichiometry of rice and ambient temperatures during cropping season we conducted some in-silico analysis and a two-year field study using a chromosomal segment substitution library (N=121) developed from a cross between heat stress susceptible parent (cv. Lemont) and comparatively heat stress tolerant parent (cv. TeQing). The in-silico results revealed a diurnal effect of heat stress where daytime and nighttime temperatures found differentially affecting yield and quality traits. The two-year replicated field study revealed that cv. TeQing harbors multiple interesting genomic regions associated with multiple thermotolerant mechanisms and thus improving rice performance for yield and quality of cv. Lemont, a premium US rice cultivar under increased ambient temperatures. Considering a narrow genetic base of US rice varieties, identified thermotolerant genetic loci (QTL) could be useful to increase performance of the US rice varieties under changing climate. Moreover, identified QTLs are novel targets for fine mapping experiments and towards increasing climate resiliency of rice crop under climate change.