首页|Dissection of the spatial dynamics of biosynthesis,transport,and turnover of major amino acids in tea plants(Camellia sinensis)

Dissection of the spatial dynamics of biosynthesis,transport,and turnover of major amino acids in tea plants(Camellia sinensis)

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High levels of free amino acids(AAs)in tea leaves are crucial for tea flavor and health function;however,the dynamic AA biosynthesis,transport,and turnover in tea plants remain elusive.Here we dissected whole tea plants for these dynamics by assessing AA profiles and transcriptomes of metabolic pathway genes in tea roots,stems,and leaves and revealing their distinctive features with regard to AA synthesis,transport,and degradation/recycling.Nitrogen assimilation dominated in the roots wherein glutamine(Gln),theanine,and arginine(Arg)were actively synthesized.Arg was transported into trunk roots and stems,together with Glu,Gln,and theanine as the major AAs in the xylem sap for long-distance root-to-leaf transport.Transcriptome analysis revealed that genes involved in Arg synthesis were highly expressed in roots,but those for Arg transport and degradation were highly expressed in stems and young leaves,respectively.CsGSIa transcripts were found in root meristem cells,root,stem and leaf vascular tissues,and leaf mesophyll where it appeared to participate in AA synthesis,transport,and recycling.Overexpression of CsGSIa in tea transgenic hairy roots and knockdown of CsGSIa in transgenic hairy roots and tea leaves produced higher and lower Gln and theanine than wild-type roots and leaves,respectively.This study provides comprehensive and new insights into AA metabolism and transport in the whole tea plant.

Shuwei Yu、Mingzhi Zhu、Ping Li、Hao Zuo、Juan Li、Yingying Li、Anqi Peng、Jianan Huang、Alisdair R.Fernie、Zhonghua Liu、Jian Zhao

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Key Laboratory of Tea Science of Ministry of Education,College of Horticulture,Hunan Agricultural University,Changsha 410128,China

Tea Research Institute,Shandong Academy of Agricultural Sciences,Jinan 250000,China

National Research Center of Engineering and Technology for Utilization of Botanical Functional Ingredients & Co-Innovation Center of Education Ministry for Utilization of Botanical Functional Ingredients,Hunan Agricultural University,Changsha 410128,China

Biotechnology Center,Anhui Agricultural University,Hefei 230036,China

State Key Laboratory of Tea Plant Biology and Utilization,Anhui Agricultural University,Hefei 230036,China

Max-Planck-Institute of Molecular Plant Physiology,Am Mühlenberg 1,14476 Potsdam-Golm,Germany

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Natural Science Foundation of Chinafunds from Hunan'Three Top'Innovative Talents Project

U23A202142022RC1142

2024

10.1093/hr/uhae060

园艺研究(英文)

园艺研究(英文)

CSTPCD
ISSN：
年,卷(期)：2024.11(5)