PDF(Pubmed)
Abstract：
The effects of red and blue light on growth and steady-state photosynthesis have been widely studied, but there are few studies focusing on dynamic photosynthesis and the effects of LED pre-treatment on cucumber seedlings\' growth, so in this study, cucumber (Cucumis sativus L. cv. Jinyou 365) was chosen as the test material. White light (W), monochromatic red light (R), monochromatic blue light (B), and mixed red and blue lights with different red-to-blue ratios (9:1, 7:3, 5:5, 3:7, and 1:9) were set to explore the effects of red and blue light on cucumber seedlings\' growth, steady-state photosynthesis, dynamic photosynthesis, and subsequent growth under fluctuating light. The results showed that compared with R and B, mixed red and blue light was more suitable for cucumber seedlings\' growth, and the increased blue light ratios would decrease the biomass of cucumber seedlings under mixed red and blue light; cucumber seedlings under 90% red and 10% blue mixed light (9R1B) grew better than other treatments. For steady-state photosynthesis, blue light decreased the actual net photosynthetic rate but increased the maximum photosynthetic capacity by promoting stomatal development and opening; 9R1B exhibited higher actual net photosynthetic rate, but the maximum photosynthetic capacity was low. For dynamic photosynthesis, the induction rate of photosynthetic rate and stomatal conductance were also accelerated by blue light. For subsequent growth under fluctuating light, higher maximum photosynthetic capacity and photoinduction rate could not promote the growth of cucumber seedlings under subsequent fluctuating light, while seedlings pre-treated with 9R1B and B grew better under subsequent fluctuating light due to the high plant height and leaf area. Overall, cucumber seedlings treated with 9R1B exhibited the highest biomass and it grew better under subsequent fluctuating light due to the higher actual net photosynthetic rate, plant height, and leaf area.
摘要：
红光和蓝光对生长和稳态光合作用的影响已被广泛研究,但是很少有研究关注动态光合作用和LED预处理对黄瓜幼苗生长的影响，所以在这项研究中，黄瓜(黄瓜。选择金油365）作为测试材料。白光(W),单色红光(R),单色蓝光（B），并设置了具有不同红蓝比（9：1、7：3、5：5、3：7和1：9）的混合红蓝光，以探索红蓝光对黄瓜幼苗生长的影响，稳态光合作用，动态光合作用,以及随后在波动光下的增长。结果表明,与R、B相比,红色和蓝色混合光更适合黄瓜幼苗的生长，蓝光比例的增加会降低红蓝光混合下黄瓜幼苗的生物量；90％红和10％蓝混合光（9R1B）下黄瓜幼苗的生长比其他处理好。对于稳态光合作用，蓝光降低了实际净光合速率，但通过促进气孔发育和开放增加了最大光合能力；9R1B表现出更高的实际净光合速率，但最大光合能力较低。对于动态光合作用，蓝光也加速了光合速率和气孔导度的诱导速率。对于波动光下的后续生长，在随后的光照波动下，较高的最大光合能力和光诱导速率不能促进黄瓜幼苗的生长，而用9R1B和B预处理的幼苗由于高的株高和叶面积而在随后的波动光照下生长更好。总的来说,用9R1B处理的黄瓜幼苗表现出最高的生物量，并且由于较高的实际净光合速率，在随后的波动光照下生长更好。植物高度,和叶面积。
