食品科学 ›› 2023, Vol. 44 ›› Issue (16): 205-212.doi: 10.7506/spkx1002-6630-20220826-322

• 生物工程 • 上一篇    下一篇

乌龙茶加工过程中(Z)-3-己烯醛与(E)-2-己烯醛转化关键调控基因的筛选与表达分析

吴晴阳,周子维,杨云,胡清财,黄慧清,林佳琪,吴宗杰,赖钟雄,孙云   

  1. (1.福建农林大学园艺学院,茶学福建省高校重点实验室,福建 福州 350002;2.福建农林大学园艺植物生物工程研究所,福建 福州 350002;3.宁德师范学院生命科学学院,福建 宁德 352000)
  • 出版日期:2023-08-25 发布日期:2023-09-01
  • 基金资助:
    财政部和农业农村部:国家现代农业(茶叶)产业技术体系建设专项(CARS-19); 福建农林大学茶产业链科技创新与服务体系建设项目(K1520005A06); 福建张天福茶叶发展基金会科技创新基金项目(FJZTF01);福建省自然科学基金项目(2021J05271); 宁德师范学院人才项目(2022Y05)

Screening and Expression Analysis of Key Regulator Genes Associated with (Z)-3-Hexenal and (E)-2-Hexenal Transformation during Manufacturing Process of Oolong Tea

WU Qingyang, ZHOU Ziwei, YANG Yun, HU Qingcai, HUANG Huiqing, LIN Jiaqi, WU Zongjie, LAI Zhongxiong, SUN Yun   

  1. (1. Key Laboratory of Tea Science in Fujian Province, College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002, China; 2. Institute of Horticultural Biotechnology, Fujian Agriculture and Forestry University, Fuzhou 350002, China; 3. College of Life Science, Ningde Normal University, Ningde 352000, China)
  • Online:2023-08-25 Published:2023-09-01

摘要: 通过检测乌龙茶加工过程中(Z)-3-己烯醛和(E)-2-己烯醛的变化,并结合转录组数据筛选4 条(3Z):(2E)-己烯醛异构酶((3Z):(2E)-hexenal isomerase,HI)关键基因,对(Z)-3-己烯醛和(E)-2-己烯醛二者变化趋势与基因表达水平进行相关性分析。结果表明,在加工过程中,(Z)-3-己烯醛和(E)-2-己烯醛大体呈现“此消彼长”的动态变化趋势;摇青工艺的机械损伤促使(Z)-3-己烯醛上升,(E)-2-己烯醛下降;而摇青后的摊放则有利于(Z)-3-己烯醛向(E)-2-己烯醛转化,使得(E)-2-己烯醛逐渐增加。筛选获得的4 条CsHI基因总体上对机械损伤和失水胁迫有较好的响应。系统发育进化树的构建发现CsHI与包括茶树、胡萝卜等物种在内的多条类萌发素蛋白具有较近的亲缘关系。本研究为明确乌龙茶加工过程中挥发性物质的形成与转化机理及乌龙茶品质提升提供一定参考依据。

关键词: 乌龙茶;加工过程;(Z)-3-己烯醛;(E)-2-己烯醛;(3Z):(2E)-己烯醛异构酶

Abstract: In this study, the contents of (Z)-3-hexenal and (E)-2-hexenal during oolong tea processing were measured and four (3Z):(2E)-hexenal isomerase (HI) genes were selected based on transcriptomic data. Meanwhile, the correlation between the changes of (Z)-3-hexenal and (E)-2-hexenal contents and related gene expression was analyzed. The results indicated that during oolong tea processing, one of the two compounds fell, while the other rose. Mechanical damage caused by tossing increased and reduced the contents of (Z)-3-hexenal and (E)-2-hexenal, respectively. Subsequent spreading contributed to the transformation of (Z)-3-hexenal into (E)-2-hexenal, resulting in an increase in the content of (E)-2-hexenal. The four selected genes all responded to mechanical stress and water deficit stress. The constructed phylogenetic tree indicated that CsHI was closely related to many germin-like proteins in plants such as tea (Camellia sinensis) and carrot (Daucus carota). This study provides a reference for clarifying the formation and transformation mechanism of volatile substances during oolong tea processing and improving the quality of oolong tea.

Key words: oolong tea; processing; (Z)-3-hexenal; (E)-2-hexenal; (3Z):(2E)-hexenal isomerase

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