红蓝光质复配对银杏幼苗光合特性及黄酮醇含量的影响

Effects of light quality with different red and blue ratios on photosynthetic characteristics and flavonol content of Ginkgo biloba seedlings

【目的】探究不同红蓝配比光质对银杏生长、光合与黄酮醇积累及抗氧化能力的影响,筛选适宜银杏生长与黄酮积累的光质,为调控提高银杏叶药用价值提供理论依据。【方法】以2年生银杏实生苗为试材,设红蓝比例为1∶1(1R1B)、1∶3(1R3B)、1∶5(1R5B)和白光(W,对照)4种光质处理,分析处理20 d后银杏生长、光合生理、黄酮醇含量及抗氧化能力。【结果】与白光相比,不同比例红蓝光均降低了银杏叶生物量,不利于株高地径的生长,却有利于提高叶长、叶宽、叶面积及光合气体交换参数。1R5B处理可提高叶片总叶绿素含量;1R1B处理促进了叶片总生物量积累;1R3B处理下叶片叶绿素荧光参数、抗氧化能力以及类胡萝卜素和总黄酮醇含量最大。【结论】适宜比例红蓝光配比光质对银杏生长及光合特性产生明显影响,并显著提高叶黄酮醇含量与抗氧化能力,且1R3B配比光质最有利于银杏黄酮类物质积累。

[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 con-tent of leaves.1R1B treatment promoted the accumulation of total leaf biomass.The chlorophyll fluores-cence 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.