数字农科院2.0

Elevated Ozone Reduces the Quality of Tea Leaves but May Improve the Resistance of Tea Plants

文献类型： 外文期刊

作者： Nuo Wang;Yuxi Wang;Xinyang Zhang;Yiqi Wu;Lan Zhang;Guanhua Liu;Jianyu Fu;Xin Li;Dan Mu;Zhengzhen Li

作者机构：

关键词： BVOCs;catechins;chemical defenses;ozone pollution;tea quality

期刊名称： Plants

ISSN： 2223-7747

年卷期： 2024 年 13 卷 8 期

页码：

收录情况： SCIE（2024版）

摘要： Tropospheric ozone (O3) pollution can affect plant nutritional quality and secondary metabolites by altering plant biochemistry and physiology, which may lead to unpredictable effects on crop quality and resistance to pests and diseases. Here, we investigated the effects of O3 (ambient air, Am; ambient air +80 ppb of O3, EO3) on the quality compounds and chemical defenses of a widely cultivated tea variety in China (Camellia sinensis cv. ‘Baiye 1 Hao’) using open-top chamber (OTC). We found that elevated O3 increased the ratio of total polyphenols to free amino acids while decreasing the value of the catechin quality index, indicating a reduction in leaf quality for green tea. Specifically, elevated O3 reduced concentrations of amino acids and caffeine but shows no impact on the concentrations of total polyphenols in tea leaves. Within individual catechins, elevated O3 increased the concentrations of ester catechins but not non-ester catechins, resulting in a slight increase in total catechins. Moreover, elevated O3 increased the emission of biogenic volatile organic compounds involved in plant defense against herbivores and parasites, including green leaf volatiles, aromatics, and terpenes. Additionally, concentrations of main chemical defenses, represented as condensed tannins and lignin, in tea leaves also increased in response to elevated O3. In conclusion, our results suggest that elevated ground-level O3 may reduce the quality of tea leaves but could potentially enhance the resistance of tea plants to biotic stresses.

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