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Combination of Red and Blue Lights Improved the Growth and Development of Eggplant (Solanum melongena L.) Seedlings by Regulating Photosynthesis

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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.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (2016YFB0302403), National Natural Sciences Foundations of China (NO.31372060), and Special Project Protected Horticulture Advantage Team of Shandong Agricultural University ‘Double First-Class’ Science and Technology Team (SYL2017YSTD07).

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  1. Qinghua Di and Jing Li have contributed equally to this work.

Authors and Affiliations

  1. State Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an, 271018, China

    Qinghua Di, Jing Li, Yufen Du, Min Wei, Qinghua Shi, Yan Li & Fengjuan Yang

  2. Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Huanghuai Region), Ministry of Agriculture and Rural Affairs, Tai’an, 271018, China

    Fengjuan Yang

  3. Shandong Province Collaborative Innovation Center of Fruit and Vegetable, Tai’an, 271018, China

    Min Wei, Qinghua Shi & Fengjuan Yang

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  1. Qinghua Di
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  4. Min Wei
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FY, MW, QS, YL, and QD designed the study. QD and YD carried out the experiment and analyzed the data. QD and JL wrote the manuscript. JL and FY revised the manuscript.

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Correspondence to Fengjuan Yang.

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Di, Q., Li, J., Du, Y. et al. Combination of Red and Blue Lights Improved the Growth and Development of Eggplant (Solanum melongena L.) Seedlings by Regulating Photosynthesis. J Plant Growth Regul 40, 1477–1492 (2021). https://doi.org/10.1007/s00344-020-10211-3

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