文献类型： 外文期刊

作者： Wang, Ying ¹ ; Li, Yan ¹ ; Wang, Jihong ³ ; Xiang, Zhun ³ ; Xi, Peiyu ³ ; Zhao, Degang ¹ ;

作者机构： 1.Guizhou Univ, Key Lab Plant Resources Conservat & Germplasm Inn, Minist Educ, Inst Agrobioengn, Guiyang 550025, Peoples R China

2.Guizhou Univ, Coll Life Sci, Guiyang 550025, Peoples R China

3.Guizhou Acad Sci, Guizhou Prov Inst Biol, Guiyang, Peoples R China

4.Guizhou Acad Agr Sci, Applicat Ctr Plant Conservat Technol, Guiyang, Peoples R China

关键词： Camellia sinensis (L; ) Kuntze var; niaowangensis Q; H; Chen; cold stress; physiological response; gene expression

期刊名称：DNA AND CELL BIOLOGY （ 影响因子：3.311； 五年影响因子：3.557 ）

ISSN： 1044-5498

年卷期： 2021 年 40 卷 7 期

页码：

收录情况： SCI

摘要： Low temperature is an important factor that affects the growth and reproduction of tea plants [Camellia sinensis (L.) Kuntze]. In this study, Yunwu Tribute Tea cutting seedlings [Camellia sinensis (L.) Kuntze var. niaowangensis Q.H. Chen] were subjected to different low-temperature treatments in Guizhou Province, China, and the changes in physiological indicators of the leaves were measured to investigate the physiological response and cold tolerance of this variety. Under cold stress, the peak of antioxidant enzyme activity appeared on the third day of treatment at 1 degrees C, indicating that Yunwu Tribute Tea could improve the resistance to cold stress through an increase in enzyme activity within a low-temperature range. However, after 3 days treatment at 1 degrees C, the tolerance of plant had been exceeded; the ability to resist cold stress disappeared, and enzyme activity decreased. When the temperature or duration of stress exceeded the maximum tolerance of the plant, the synthesis of soluble substances decreased in concert with their protective effects. Under cold conditions, Yunwu Tribute Tea could increase the production of abscisic acid growth inhibitors and reduce those of indoleacetic acid, gibberellin, and other growth promoting substances to manage cold stress by regulating the balance of growth regulators in the plant. Five differential genes were screened as candidate genes from the Yunwu Tribute Tea cold stress transcriptome (DW, 1 degrees C) for fluorescence quantitative analysis. The results showed that the changes in levels of expression of these genes under continuous cold stress significantly positively correlated with the corresponding physiological indicators. Nevertheless, the levels of expression of the Yunwu Tribute Tea polyphenol oxidase (PPO) gene and the gibberellin 3 beta-dioxygenase gene (G3O2) were reversely inhibited under cold stress. The result was consistent with the corresponding physiological indicators, and it provides a basis for the study of cold resistance mechanisms in tea plants.