各种光谱,尤其是红光(RL)和蓝光(BL),对植物的生理过程和生长有很大的影响。以前,我们发现,在BL或RL和BL混合下,甜椒的植物光形态建成和光合作用发生了显着变化。本研究旨在阐明RL和BL混合如何在光形态建成过程中影响植物光合作用。我们检查了增长,植物形态学,单色RL下甜椒幼苗的光合响应,BL,不同比例的混合RL和BL(9R1B,6R1B,3R1B,1R1B,1R3B)具有相同的光合光子通量密度300μmol·m-2·s-1。使用白光(WL)作为对照。结果表明,下胚轴的伸长和第一节间以及叶片的扩张都受到RL的刺激,与WL相比,BL明显抑制。相反,叶子的发展,RL抑制了生物量积累和光合特性,但BL促进了生物量积累和光合特性。此外,与WL和其他治疗方法相比,3R1B能显著提高净光合速率,气体交换,光合电子传递能力,光化学效率,茎和根生物量的积累。此外,幼苗生长强劲,暴露于这种处理后,幼苗指数的值最大。总的来说,这些结果表明,在3R1B下生长的辣椒幼苗表现更好,可能是由于更平衡的光谱。更有利于提高甜椒的植物光形态发生和光合作用,在这种混合光谱下,可以同时实现更高的生物量积累和能量利用效率。
Various light spectra, especially red (RL) and blue light (BL), have great effects on physiological processes and growth of plants. Previously, we revealed that the plant photomorphogenesis and photosynthesis of sweet pepper was significantly altered under BL or mixed RL and BL. The present study aimed to elucidate how mixed RL and BL influences plant photosynthesis during photomorphogenesis. We examined the growth, plant morphology, photosynthetic response of sweet pepper seedlings under monochromatic RL, BL, different ratios of mixed RL and BL (9R1B, 6R1B, 3R1B, 1R1B, 1R3B) with the same photosynthetic photon flux density of 300 μmol·m-2·s-1. White light (WL) were used as a control. The findings showed that the elongation of hypocotyl and first internode as well as leaf expansion were all stimulated by RL, while significantly restrained by BL compared with WL. Conversely, the leaf development, biomass accumulation and photosynthetic properties were inhibited by RL but promoted by BL. Additionally, compared with WL and other treatments, 3R1B could significantly improve the net photosynthetic rate, gas exchange, photosynthetic electron transport capacity, photochemical efficiency, shoot and root biomass accumulation. Furthermore, seedlings grew robustly and exhibited the greatest value of seedling index when exposed to this treatment. Overall, these results suggested that pepper seedlings grown under 3R1B performed better, possibly due to the more balanced light spectrum. It was more conducive to improve the plant photomorphogenesis and photosynthesis of sweet pepper, and a higher biomass accumulation and energy utilization efficiency could be achieved simultaneously under this mixed light spectrum.