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The Combinations of White, Blue, and UV-A Light Provided by Supplementary Light-Emitting Diodes Promoted the Quality of Greenhouse-Grown Cucumber Seedlings

Author

Listed:
  • Zhengnan Yan

    (College of Horticulture, Qingdao Agricultural University, Qingdao 266109, China
    These authors contributed equally to this work.)

  • Chunling Wang

    (College of Water Resources and Architecture Engineering, Tarim University, Aral 843300, China
    These authors contributed equally to this work.)

  • Long Wang

    (College of Horticulture, Qingdao Agricultural University, Qingdao 266109, China)

  • Xin Li

    (College of Horticulture, Qingdao Agricultural University, Qingdao 266109, China)

  • Guanjie Wang

    (Shandong Qicai Manor Vegetable Food Base Co., Ltd., Shouguang 262700, China)

  • Yanjie Yang

    (College of Horticulture, Qingdao Agricultural University, Qingdao 266109, China)

Abstract

Insufficient solar light in winter inside the greenhouse may lead to a lower quality of vegetable seedlings, and supplemental light is an effective technique to solve this problem. This study evaluated the impacts of supplementary white (W)-light-emitting diodes (LEDs), ultraviolet A LEDs (UV-A), white and blue LEDs (WB), the combinations of white and UV-A LEDs (W-UVA), and white, blue, and UV-A LEDs (WB-UVA) on the leaf morphology, photosynthetic traits, biomass accumulation, root architecture, and hormone content of cucumber ( Cucumis sativus L. cv. Tianjiao No. 5) seedlings grown in the greenhouse. The results indicated that supplementary LED lighting led to a decreased plant height, shorter hypocotyl length, bigger leaf area, and thicker leaf compared with those grown with solar light only, regardless of light quality. The shoot fresh weight, root fresh weight, and seedling quality index of cucumber seedlings grown under the combinations of white, blue, and UVA radiations increased by 30.8%, 3.2-fold, and 1.8-fold, respectively, compared with those grown with natural light only. However, no significant differences were exhibited in the biomass accumulation of greenhouse-grown cucumber seedlings between the control and the UVA treatment. The cellulose content and stem firmness of greenhouse-grown cucumber seedlings grown under the combinations of white, blue, and UVA radiations increased by 49.9% and 13.1%, respectively, compared with those grown under white light only. Additionally, the cytokinin content of cucumber seedlings was promoted by over 36.7% by applying supplementary light. In summary, the combinations of white, blue, and UVA radiations led to compact morphological characteristics, superior mechanical properties, and preferable growth performance, which could be applied as an available lighting strategy to obtain the desired morphological and quality properties of vegetable seedlings.

Suggested Citation

  • Zhengnan Yan & Chunling Wang & Long Wang & Xin Li & Guanjie Wang & Yanjie Yang, 2022. "The Combinations of White, Blue, and UV-A Light Provided by Supplementary Light-Emitting Diodes Promoted the Quality of Greenhouse-Grown Cucumber Seedlings," Agriculture, MDPI, vol. 12(10), pages 1-14, October.
    • Handle: RePEc:gam:jagris:v:12:y:2022:i:10:p:1593-:d:931817
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    References listed on IDEAS

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    1. Md Obyedul Kalam Azad & Katrine Heinsvig Kjaer & Md Adnan & Most Tahera Naznin & Jung Dae Lim & In Je Sung & Cheol Ho Park & Young Seok Lim, 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 ," Agriculture, MDPI, vol. 10(2), pages 1-16, January.
    2. Jianfeng Zheng & Peidian Gan & Fang Ji & Dongxian He & Po Yang, 2021. "Growth and Energy Use Efficiency of Grafted Tomato Transplants as Affected by LED Light Quality and Photon Flux Density," Agriculture, MDPI, vol. 11(9), pages 1-14, August.
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    Cited by:

    1. Filippos Bantis & Athanasios Koukounaras, 2023. "Impact of Light on Horticultural Crops," Agriculture, MDPI, vol. 13(4), pages 1-4, April.

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