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- W4386878216 abstract "Continuously increasing global temperatures present great challenges to food security. Grain size, one of the critical components determining grain yield in rice (Oryza sativa L.), is a prime target for genetic breeding. Thus, there is an immediate need for genetic improvement in rice to maintain grain yield under heat stress. However, quantitative trait loci (QTLs) endowing heat stress tolerance and grain size in rice are extremely rare. Here, we identified a novel negative regulator with pleiotropic effects, Thermo-Tolerance and grain Length 1 (TTL1), from the super pan-genomic and transcriptomic data. Loss-of-function mutations in TTL1 enhanced heat tolerance, and caused an increase in grain size by coordinating cell expansion and proliferation. TTL1 was shown to function as a transcriptional regulator and localized to the nucleus and cell membrane. Furthermore, haplotype analysis showed that hap L and hap S of TTL1 were obviously correlated with variations of thermotolerance and grain size in a core collection of cultivars. Genome evolution analysis of available rice germplasms suggested that TTL1 was selected during domestication of the indica and japonica rice subspecies, but still had much breeding potential for increasing grain length and thermotolerance. These findings provide insights into TTL1 as a novel potential target for development of high-yield and thermotolerant rice varieties. This article is protected by copyright. All rights reserved." @default.
- W4386878216 created "2023-09-21" @default.
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- W4386878216 date "2023-09-20" @default.
- W4386878216 modified "2023-09-27" @default.
- W4386878216 title "Identification of natural allelic variation in <i>TTL1</i> controlling thermotolerance and grain size by a rice super pan‐genome" @default.
- W4386878216 doi "https://doi.org/10.1111/jipb.13568" @default.
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- W4386878216 hasPublicationYear "2023" @default.
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