UV-A Supplement Improved Growth, Antioxidant Capacity, and Anthocyanin Accumulation in Purple Lettuce (Lactuca sativa L.)

文献类型： 外文期刊

第一作者： Qin, Hengshan

作者： Qin, Hengshan;Xu, Yaliang;Zheng, Yinjian;Li, Qingming;Qin, Hengshan;Liu, Binbin;Li, Qingming;Qin, Hengshan;Liu, Binbin;Li, Qingming;Gao, Yong

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关键词： light recipes; purple lettuce; Ultraviolet-A; antioxidant system; anthocyanin synthesis

期刊名称：HORTICULTURAE （ 影响因子：3.1； 五年影响因子：3.4 ）

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年卷期： 2023 年 9 卷 6 期

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收录情况： SCI

摘要： This study investigated the impact of various light qualities on the growth, photosynthesis, antioxidant capacity, anthocyanin accumulation and associated gene expression in purple lettuce. The results showed that stem diameter, leaf number and dry mass of purple leaves lettuce increased significantly under white light plus red and blue light (WRB) plus 10 & mu;mol & BULL;m(-2)& BULL;s(-1) UV-A (SUV1), plus 20 & mu;mol & BULL;m(-2)& BULL;s(-1) UV-A (SUV2) and plus 30 & mu;mol & BULL;m(-2)& BULL;s(-1) UV-A (SUV3) treatments compared to white light plus red and blue light (WRB). Leaf expansion decreased with increasing UV-A doses, while fresh leaf mass was higher under SUV1 and SUV2 treatments. Photosynthesis parameters were improved under WRB, SUV1 and SUV2 treatments, with an increase in net photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate (Tr) and a decrease in intercellular carbon dioxide concentration (Ci) under SUV3 treatment. Superoxide radical generation rate, hydrogen peroxide and malondialdehyde (MDA) content and relative conductivity increased significantly under SUV3 treatment. Anthocyanin content increased significantly with increasing doses of UV-A treatment, while related structural gene expression levels were upregulated more significantly by SUV2 and SUV3 treatments than WRB treatment. In summary, moderate UV-A supplementation can enhance the antioxidant system and promote anthocyanin accumulation in purple lettuce. Specifically, WRB plus 20 & mu;mol & BULL;m(-2)& BULL;s(-1) UV-A (SUV2) is recommended as an optimal light recipe for cultivating purple lettuce in protected horticulture.

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