Effects of different proportions of red and blue light on photosynthetic characteristics and flavonol content of Ginkgo biloba seeding

Abstract

[Objective] The study aims to investigate the effects of light quality with different red and blue ratios on the growth, photosynthesis, flavonol accumulation, and antioxidant capacity of Ginkgo biloba, select the light quality suitable for the growth and flavonoid accumulation, and provide a theoretical basis for improving the medicinal value of G. biloba leaves. [Methods] Two-year-old G. biloba seedlings were used, and four light quality treatments with red and blue ratios of 1∶1 (1R1B), 1∶3 (1R3B), 1∶5 (1R5B), and white light (W, control) were set up. The growth, photosynthetic physiology, flavonol content, and antioxidant capacity of G. biloba after 20 days of treatment were analyzed. [Results] Different ratios of red and blue light reduced the biomass of G. biloba leaves, which was not conducive to the growth of plant height and ground diameter, but was conducive to the improvement of leaf length, width, and area and photosynthetic gas exchange parameters.1R5B treatment increased the total chlorophyll content of leaves. 1R1B treatment promoted the accumulation of total leaf biomass. The chlorophyll fluorescence parameters, antioxidant capacity, carotenoid, and total flavonol contents of leaves under 1R3B were the highest. [Conclusion] The appropriate proportion of red and blue light had a significant effect on the growth and photosynthetic characteristics of G. biloba, and significantly increased the content of flavonols and antioxidant capacity. 1R3B red and blue light quality was the most conducive to the accumulation of flavonoids.

Keywords

• ginkgo biloba
• light quality
• photosynthetic characteristics
• flavonol
• oxidation resistance