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Int J Mol Sci

Title:		Influence of Chloroplast Defects on Formation of Jasmonic Acid and Characteristic Aroma Compounds in Tea (Camellia sinensis) Leaves Exposed to Postharvest Stresses
Author(s):		Li J; Zeng L; Liao Y; Gu D; Tang J; Yang Z;
Address:		"Tea Research Institute, Guangdong Academy of Agricultural Sciences & Guangdong Provincial Key Laboratory of Tea Plant Resources Innovation and Utilization, Dafeng Road 6, Tianhe District, Guangzhou 510640, China. skylong.41@163.com. Guangdong Provincial Key Laboratory of Applied Botany & Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, Xingke Road 723, Tianhe District, Guangzhou 510650, China. zenglanting@scbg.ac.cn. College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China. zenglanting@scbg.ac.cn. Guangdong Provincial Key Laboratory of Applied Botany & Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, Xingke Road 723, Tianhe District, Guangzhou 510650, China. honey_yyliao@scbg.ac.cn. College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China. honey_yyliao@scbg.ac.cn. Guangdong Provincial Key Laboratory of Applied Botany & Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, Xingke Road 723, Tianhe District, Guangzhou 510650, China. gdcawang@126.com. College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China. gdcawang@126.com. Tea Research Institute, Guangdong Academy of Agricultural Sciences & Guangdong Provincial Key Laboratory of Tea Plant Resources Innovation and Utilization, Dafeng Road 6, Tianhe District, Guangzhou 510640, China. tangjinchi@126.com. Guangdong Provincial Key Laboratory of Applied Botany & Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, Xingke Road 723, Tianhe District, Guangzhou 510650, China. zyyang@scbg.ac.cn. College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China. zyyang@scbg.ac.cn"
Journal Title:		Int J Mol Sci
Year:		2019
Volume:		20190227
Issue:		5
Page Number:		-
DOI:		10.3390/ijms20051044
ISSN/ISBN:		1422-0067 (Electronic) 1422-0067 (Linking)
Abstract:		"Characteristic aroma formation in tea (Camellia sinensis) leaves during the oolong tea manufacturing process might result from the defense responses of tea leaves against these various stresses, which involves upregulation of the upstream signal phytohormones related to leaf chloroplasts, such as jasmonic acid (JA). Whether chloroplast changes affect the formation of JA and characteristic aroma compounds in tea leaves exposed to stresses is unknown. In tea germplasms, albino-induced yellow tea leaves have defects in chloroplast ultrastructure and composition. Herein, we have compared the differential responses of phytohormone and characteristic aroma compound formation in normal green and albino-induced yellow tea leaves exposed to continuous wounding stress, which is the main stress in oolong tea manufacture. In contrast to single wounding stress (from picking, as a control), continuous wounding stress can upregulate the expression of CsMYC2, a key transcription factor of JA signaling, and activate the synthesis of JA and characteristic aroma compounds in both normal tea leaves (normal chloroplasts) and albino tea leaves (chloroplast defects). Chloroplast defects had no significant effect on the expression levels of CsMYC2 and JA synthesis-related genes in response to continuous wounding stress, but reduced the increase in JA content in response to continuous wounding stress. Furthermore, chloroplast defects reduced the increase in volatile fatty acid derivatives, including jasmine lactone and green leaf volatile contents, in response to continuous wounding stress. Overall, the formation of metabolites derived from fatty acids, such as JA, jasmine lactone, and green leaf volatiles in tea leaves, in response to continuous wounding stress, was affected by chloroplast defects. This information will improve understanding of the relationship of the stress responses of JA and aroma compound formation with chloroplast changes in tea"
Keywords:		"Camellia sinensis/*chemistry/genetics Chloroplasts/*metabolism Cyclopentanes/*metabolism Gene Expression Regulation, Plant Genes, Plant Oxylipins/*metabolism Plant Growth Regulators/metabolism Plant Leaves/*chemistry/*physiology *Stress, Physiological Vol;"
Notes:		"MedlineLi, Jianlong Zeng, Lanting Liao, Yinyin Gu, Dachuan Tang, Jinchi Yang, Ziyin eng 31600559/National Natural Science Foundation of China/ 2018M640837/China Postdoctoral Science Foundation/ 201804010097/Foundation of Science and Technology Program of Guangzhou/ 2016A030306039/Guangdong Natural Science Foundation for Distinguished Young Scholar/ 2018LM1092/Guangdong Innovation Team of Modern Agricultural Industry Technology System/ 201627TD/Academic Team Construction Projects of Guangdong Academy of Agricultural Sciences/ Switzerland 2019/03/02 Int J Mol Sci. 2019 Feb 27; 20(5):1044. doi: 10.3390/ijms20051044"