Wang Shunli, Liu Xiaoting, Liu Xiaoning, Xue Jingqi, Ren Xiuxia, Zhai Yanning, Zhang Xiuxin
Key Laboratory of Biology and Genetic Improvement of Flower Crops (North China), Ministry of Agriculture and Rural Affairs, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, China.
Front Plant Sci. 2022 Dec 1;13:1048770. doi: 10.3389/fpls.2022.1048770. eCollection 2022.
Light quality strongly impacts the growth and flower quality of ornamental plants. The optimum light quality for the growth and flowering of remains to be validated. In the present study, we investigated the effect of the red/blue light ratio of LEDs on the growth and flowering quality of 'Red Lion'. Two LEDs with red/blue light ratio of 1:9 (RB) and 9:1 (RB) were designed. LEDs of white light were the control. In the earlier vegetative and reproductive growth phase, RB increased the biomass of the bulbs, leaves, and flowers. Compared with the control and RB group, RB LEDs delayed flowering by 2.30 d and 3.26 d, respectively. Based on chlorophyll contents, photosynthetic capacity, chlorophyll fluorescence parameters, and carbohydrate contents, the photosynthesis rate was higher in the RB group. Optimal red and blue light intensity promoted the accumulation of carbohydrates and early flowering and prolonged the flowering period of . Microscopic analysis showed that stomatal density was high, and the number of chloroplasts was large in the RB treatment group, which enhanced photosynthesis. Particularly, RB promoted the expression of seven key genes related to chlorophyll synthesis. RB also promoted early overexpression of the gene that promotes early flowering. Thus, higher blue light and 10% red light intensities promote early and extended flowering, while higher red light and 10% blue light promote vegetative plant growth but delay flowering.
光质对观赏植物的生长和花朵品质有强烈影响。[植物名称]生长和开花的最佳光质仍有待验证。在本研究中，我们研究了发光二极管（LED）的红/蓝光比例对‘红狮’[植物名称]生长和开花品质的影响。设计了两种红/蓝光比例分别为1:9（RB）和9:1（RB）的LED。白光LED作为对照。在营养生长和生殖生长早期阶段，RB增加了鳞茎、叶片和花朵的生物量。与对照组和RB组相比，RB LED分别使开花延迟了2.30天和3.26天。基于叶绿素含量、光合能力、叶绿素荧光参数和碳水化合物含量，RB组的光合速率更高。最佳的红光和蓝光强度促进了碳水化合物的积累和提前开花，并延长了[植物名称]的花期。微观分析表明，RB处理组的气孔密度高，叶绿体数量多，这增强了光合作用。特别是，RB促进了七个与叶绿素合成相关的关键基因的表达。RB还促进了促进早花的[基因名称]基因的早期过表达。因此，较高的蓝光和10%的红光强度促进早花并延长花期，而较高的红光和10%的蓝光促进植物营养生长但延迟开花。
