Combination of Red and Blue Lights Improved the Growth and Development of Eggplant ( Solanum melongena L.) Seedlings by
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Combination of Red and Blue Lights Improved the Growth and Development of Eggplant (Solanum melongena L.) Seedlings by Regulating Photosynthesis Qinghua Di1 · Jing Li1 · Yufen Du1 · Min Wei1,3 · Qinghua Shi1,3 · Yan Li1 · Fengjuan Yang1,2,3 Received: 26 May 2020 / Accepted: 18 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The photosynthesis, photomorphogenesis, and photoperiod processes in plants are regulated according to light intensity and quality. The aim of this study was to investigate the effects of different light qualities on eggplant seedlings and determine the best light quality for growth. The seedlings of eggplant cultivar ‘Jingqiejingang’ were grown under light-emitting diodes (LEDs): white (W, the control), red (R), blue (B), and different ratios of B/R lights (B/R = 1/1, B/R = 1/3, B/R = 1/6, B/R = 1/9). The growth parameters, leaf morphology, photosynthetic performance, chlorophyll fluorescence, and the carbon and nitrogen metabolism in the leaves of eggplant seedlings under different LED light treatments were studied. The results showed that the plant height, leaf development, and photosynthetic characteristics were inhibited by red light but elevated by blue light compared with the control. Conversely, the contents of chlorophyll a, chlorophyll b, and carotenoids were all increased by red light, while decreased by blue light significantly. In addition, the contents of carbohydrates and the activities of nitrogen assimilation enzymes were not or little changed by the monochromatic blue and red light. The combined light of red and blue were more beneficial for growth than the monochromatic light, especially B/R = 1/3 light. Under B/R = 1/3 light, the parameter values of plant growth, leaf development, photosynthetic pigments and characteristics, and carbon and nitrogen metabolism were all maximum. Taken together, combined application lights of red and blue are good practice for the cultivation of eggplant seedlings, and LED B/R = 1/3 light was optimum. Keywords Eggplant seedling · Light-emitting diodes · Ratio of blue and red lights · Photosynthesis
Introduction
Qinghua Di and Jing Li have contributed equally to this work. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00344-020-10211-3) contains supplementary material, which is available to authorized users. * Fengjuan Yang [email protected] 1
State Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an 271018, China
2
Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Huanghuai Region), Ministry of Agriculture and Rural Affairs, Tai’an 271018, China
3
Shandong Province Collaborative Innovation Center of Fruit and Vegetable, Tai’an 271018, China
Photosynthesis is the base of crop yield and quality and depends upon the concentration of Chl a, Chl b, and carotenoids, which affect photosynthetic capability directly (Li et al. 2018; Tan et al. 2011;
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