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Identification of natural allelic variation in TTL1 controlling thermotolerance and grain size by a rice super pan-genome

文献类型： 外文期刊

作者： Lin, Yarong 1 ; Zhu, Yiwang 1 ; Cui, Yuchao 3 ; Qian, Hongge 2 ; Yuan, Qiaoling 2 ; Chen, Rui 1 ; Lin, Yan 1 ; Chen, Jianmin 1 ; Zhou, Xishi 2 ; Shi, Chuanlin 2 ; He, Huiying 2 ; Hu, Taijiao 1 ; Gu, Chenbo 1 ; Yu, Xiaoman 2 ; Zhu, Xiying 2 ; Wang, Yuexing 5 ; Qian, Qian 2 ; Zhang, Cuijun 2 ; Wang, Feng 1 ; Shang, Lianguang 2 ;

作者机构： 1.Fujian Acad Agr Sci, Inst Biotechnol, Fujian Prov Key Lab Genet Engn Agr, Fuzhou 350003, Peoples R China

2.Chinese Acad Agr Sci, Agr Genom Inst Shenzhen, Minist Agr & Rural Affairs, Guangdong Lab Lingnan Modern Agr,Genome Anal Lab,S, Shenzhen 518120, Peoples R China

3.Xiamen Univ, Sch Life Sci, Xiamen Key Lab Plant Genet, Xiamen 361102, Peoples R China

4.Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha 410128, Peoples R China

5.China Natl Rice Res Inst, State Key Lab Rice Biol, Hangzhou 311401, Peoples R China

6.Yazhouwan Natl Lab, 8 Huanjin Rd, Sanya 572024, Peoples R China

关键词： domestication; grain size; heat tolerance; pan-genome; natural variation; domestication; grain size; heat tolerance; pan-genome; natural variation

期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：11.4； 五年影响因子：10.1 ）

ISSN： 1672-9072

年卷期： 2023 年

页码：

收录情况： SCI

摘要： 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 the development of high -yield and thermotolerant rice varieties.

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