Acta Horticulturae Sinica ›› 2021, Vol. 48 ›› Issue (8): 1504-1516.doi: 10.16420/j.issn.0513-353x.2021-0216

• Research Papers • Previous Articles     Next Articles

Effects of Supplemental Lighting at Different Positions on Tomato Plant Morphology,Photosynthesis and Endogenous Hormone Biosynthesis Under Low-light Environment

QI Zhenyu1, WANG Ting2, SANG Kangqi2, LIU Yue2, WANG Mingqin3, YU Jingquan2, ZHOU Yanhong2, XIA Xiaojian2,*()   

  1. 1Agricultural Experiment Station,Zhejiang University,Hangzhou 310058,China
    2Department of Horticulture,Zhejiang University,Hangzhou 310058,China
    3Shouguang New Century Seedling Co.,Ltd.,Weifang,Shandong 262700,China
  • Received:2021-04-15 Revised:2021-07-06 Online:2021-08-25 Published:2021-09-06
  • Contact: XIA Xiaojian


Greenhouse tomato production is often limited by insufficient light. It is of great significance to use LEDs for improvement of light environment. However,considering the cost and efficient use of resources,development and optimization of LED supplemental lighting technology are urgently required. In this study,the tomato plants were supplemented with top-lighting and inter-lighting using LEDs in a low-light environment,and the effects on plant morphology,photosynthetic efficiency and hormone metabolism were studied. Top-lighting promoted the photosynthetic efficiency of leaves at different positions,and led to an overall increase in the leaf area,a shorter plant height,smaller leaf angles,and an increase in the number of flowers. Changes in plant morphology were accompanied by reduced auxin (IAA)content,increased cytokinin(CK)content and down-regulation of brassinosteroid(BR)synthesis genes. Inter-lighting mainly promotes the photosynthetic efficiency and leaf area of the middle and lower leaves,significantly increased plant height and slightly increased the leaf angles of upper leaves. However,it had no effect on flower number,and in general had less effects on hormone metabolism as compared with top-lighting. Taken together,the top-lighting facilitates the formation of a better plant architecture,and promotes the photosynthesis and growth of tomato plants as a whole,and is a promising technology with potential application in the future.

Key words: tomato, greenhouse tomato, chlorophyll fluorescence, LED, photosynthesis, supplemental lighting

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