UV-A Supplement Improved Growth, Antioxidant Capacity, and Anthocyanin Accumulation in Purple Lettuce (Lactuca sativa L.)
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Published:2023-05-29
Issue:6
Volume:9
Page:634
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ISSN:2311-7524
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Container-title:Horticulturae
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language:en
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Short-container-title:Horticulturae
Author:
Qin Hengshan123, Xu Yaliang1ORCID, Liu Binbin23, Gao Yong4, Zheng Yinjian1, Li Qingming123ORCID
Affiliation:
1. Institute of Urban Agriculture, Chinese Academy of Agricultural Science, Chengdu 610299, China 2. College of Horticulture Science and Engineering, Shandong Agricultural University, Taian 271018, China 3. State Key Laboratory of Crop Biology, Shandong Agricultural University, Taian 271018, China 4. Fujian Sanan Sino-Science Photobiotech Co., Ltd., Xiamen 361013, China
Abstract
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 µmol·m−2·s−1 UV-A (SUV1), plus 20 µmol·m−2·s−1 UV-A (SUV2) and plus 30 µmol·m−2·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 µmol·m−2·s−1 UV-A (SUV2) is recommended as an optimal light recipe for cultivating purple lettuce in protected horticulture.
Funder
Agricultural Science and Technology Innovation Program Elite Youth Program of the Chinese Academy of Agricultural Sciences Sichuan Province Key Technology R&D Program Local Financial Funds of National Agricultural Science and Technology Center, Chengdu
Subject
Horticulture,Plant Science
Reference45 articles.
1. Light quality manipulation improves vegetable quality at harvest and postharvest: A review;Ilic;Environ. Exp. Bot.,2017 2. The effects of light-emitting diode lighting on greenhouse plant growth and quality;Olle;Agric. Food Sci.,2013 3. Azad, M.O.K., Kjaer, K.H., Adnan, M., Naznin, M.T., Lim, J.D., Sung, I.J., Park, C.H., and Lim, Y.S. (2020). The Evaluation of Growth Performance, Photosynthetic Capacity, and Primary and Secondary Metabolite Content of Leaf Lettuce Grown under Limited Irradiation of Blue and Red LED Light in an Urban Plant Factory. Agriculture, 10. 4. Growth and phenolic compounds of Lactuca sativa L. grown in a closed-type plant production system with UV-A,-B, or-C lamp;Lee;J. Sci. Food Agric.,2014 5. Naznin, M.T., Lefsrud, M., Gravel, V., and Azad, M.O.K. (2019). Blue Light added with Red LEDs Enhance Growth Characteristics, Pigments Content, and Antioxidant Capacity in Lettuce, Spinach, Kale, Basil, and Sweet Pepper in a Controlled Environment. Plants, 8.
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