Comprehensive dissection of variation and accumulation of free amino acids in tea accessions
文献类型： 外文期刊
作者： Huang, Rong 1 ; Wang, Zhihua 1 ; Wen, Weiwei 3 ; Yao, Mingzhe 1 ; Liu, Haoran 1 ; Li, Fang 1 ; Zhang, Shuran 1 ; Ni, Dejiang 3 ; Chen, Liang 1 ;
作者机构： 1.Chinese Acad Agr Sci, Key Lab Biol, Genet & Breeding Special Econ Anim & Plants, Minist Agr & Rural Affairs, Hangzhou 310008, Peoples R China
2.Chinese Acad Agr Sci, Tea Res Inst, Hangzhou 310008, Peoples R China
3.Huazhong Agr Univ, Coll Hort & Forestry Sci, Wuhan 430070, Peoples R China
期刊名称：HORTICULTURE RESEARCH （ 影响因子：8.7； 五年影响因子：9.0 ）
ISSN： 2662-6810
年卷期： 2024 年 11 卷 1 期
页码：
收录情况： SCI
摘要： Free amino acids (FAAs) positively determine the tea quality, notably theanine (Thea), endowing umami taste of tea infusion, which is the profoundly prevalent research in albino tea genetic resources. Therefore, 339 tea accessions were collected to study FAAs level for deciphering its variation and accumulation mechanism. Interestingly, alanine (Ala) and Thea which had the highest diversity index (H ') value among three varieties of Camellia sinensis (L.) O. Kuntze were significantly higher than wild relatives (P < 0.05). The intraspecific arginine (Arg) and glutamine (Gln) contents in C. sinensis var. assamica were significantly lower than sinensis and pubilimba varieties. Moreover, the importance of interdependencies operating across FAAs and chlorophyll levels were highlighted via the cell ultrastructure, metabolomics, and transcriptome analysis. We then determined that the association between phytochrome interacting factor 1 (CsPIF1) identified by weighted gene co-expression network analysis (WGCNA) and Thea content. Intriguingly, transient knock-down CsPIF1 expression increased Thea content in tea plant, and the function verification of CsPIF1 in Arabidopsis also indicated that CsPIF1 acts as a negative regulator of Thea content by mainly effecting the genes expression related to Thea biosynthesis, transport, and hydrolysis, especially glutamate synthase (CsGOGAT), which was validated to be associated with Thea content with a nonsynonymous SNP by Kompetitive Allele-Specific PCR (KASP). We also investigated the interspecific and geographical distribution of this SNP. Taken together, these results help us to understand and clarify the variation and profile of major FAAs in tea germplasms and promote efficient utilization in tea genetic improvement and breeding.
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