Effects of Low-Temperature Stress on Cold Resistance Biochemical Characteristics of Dali and Siqiu Tea Seedlings
文献类型： 外文期刊
第一作者： Chen, Ming
作者： Chen, Ming;Hou, Mengyue;Luo, Wen;Huang, Xiaoxia;Chen, Ming;Zhu, Xizhe;Jiang, Yongwen;Yu, Yaya;Wang, Jinjin;Yuan, Haibo;Hua, Jinjie
作者机构：
关键词： low-temperature stress; tea tree; physiological and biochemical characteristics; soluble sugar; chlorophyll; peroxidase
期刊名称：HORTICULTURAE （ 影响因子：3.0； 五年影响因子：3.2 ）
ISSN：
年卷期： 2024 年 10 卷 8 期
页码：
收录情况： SCI
摘要： Cold stress causes considerable damage to tender tea seedlings. Previous studies have explored changes in the physiological and biochemical factors of tea in response to cold stress; however, the mechanisms of cold resistance in ancient tea tree plants are unclear. The aim of this study was to analyze the effects of 0 degrees C cold stress for 15 days and 24 degrees C ambient temperature recovery for 5 days on the physiological and biochemical characteristics of two representative old tea varieties: Dali tea and Siqiu tea. The results revealed significant changes in antioxidant, photosynthetic efficiency, and physiological and biochemical indicators in response to cold stress, with the two species exhibiting different patterns. Cold stress decreased chlorophyll and carotene content, Fv/Fm, Y(II), non-photochemical quenching coefficient, photochemical quenching, and superoxide dismutase (SOD) activity, and increased intercellular CO2 concentration and ascorbate peroxidase activity. Siqiu tea showed a higher increase in soluble sugar content and antioxidant enzyme activity and a lower accumulation of malondialdehyde and minimal fluorescence (F0) than Dali, indicating a greater tolerance to cold stress. Based on partial least-squares discriminant analysis, six key differential physiological indicators of cold resistance-water-soluble sugar, F0, peroxidase, catalase, SOD, and gas conductance-were identified. Our findings provide technical support for identifying ways to protect ancient tea trees from extreme weather conditions.
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