LED红蓝光质对水稻幼苗生长及生理特性的影响

为研究不同LED红蓝光质比对水稻幼苗生长和生理特性的影响,以湘早籼45号为试验材料,通过在白光的基础上添加不同光质比例的红光(主波长662 nm)和蓝光(457 nm),设置T1(白光:蓝光=2:1)、T2(白光:蓝光=1:2)、T3(白光:红光=7:1)、T4(白光:红光=2:1)、T5(白光:红光=3:2)、T6(白光:红光=1:2)共6种不同光质配比,以白光为对照(CK),探究不同光质比对水稻幼苗形态指标和生理特性的影响。结果表明,增加红光比例提高了水稻幼苗株高、倒二叶叶长、叶面积、壮苗指数、地下部鲜重、根总长、根总数、根表面积、叶绿素含量和叶片过氧化氢酶(CAT)活性。增加蓝光比例抑制了水稻幼苗的株高、第一叶叶鞘长,但在蓝光作用下水稻幼苗茎基宽、倒二叶叶宽、叶面积、壮苗指数、幼苗生物量、根总长、根总数、根表面积、根体积、叶绿素含量增加。T2的茎基宽和壮苗指数最大,相比CK分别增加了23.1%和51.6%。T3和T4有利于生物量积累以及叶面积和叶片抗氧化酶活性的提高,相比CK,T3和T4叶面积分别提高46.9%和45.6%。综上,LED红光提高了水稻叶片叶面积和抗氧化酶活性,促进幼苗干物质积累和根系系统的发育,蓝光则提高了茎基宽和壮苗指数,对改善水稻幼苗形态和培育壮苗具有重要意义。本研究为优化水稻工厂化育秧光照参数提供了理论依据。

Effects of LED Red and Blue Light Ratio on Growth and Physiological Characteristics of Rice Seedlings

In order to study effects of different LED red and blue light ratio on the growth and physiological characteristics of rice seedlings, Xiangzaoxian 45 was used as the experimental material by adding different proportions of red light R (main wavelength 662nm) and blue light B (main wavelength 457nm) on the basis of white light. Six proportions of light quality were set T1, white light: blue light=2:1 (light quality ratio); T2, white light:blue light=1:2; T3, white light:red light=7:1; T4, white light:red light=2:1; T5, White light:red light=3:2; T6, white light:red light=1:2, respectively. The effects of different light quality ratios on the morphological and physiological characteristics of rice seedlings were studied by using white light (W) as a control. The results showed that increasing the proportion of red light increased the plant height, the length of the second leaf, the leaf area, the seedling index, the fresh weight of underground part, the total length of root, the total number of roots, the surface area of root, the chlorophyll content and the Hydrogenase (CAT) activity of leaf. Increasing blue light inhibited the plant height, first leaf sheath length of rice seedlings were increased as wellas the total number of roots, root surface area, root volume, and chlorophyll content. The stem width and seedling index of T2 treatment were the highest, which increasing by 23.1% and 51.6%, respectively. T3 and T4 treatments were beneficial to biomass accumulation, increasing leaf area and antioxidant enzyme activity, and increasing leaf area of T3 and T4 by 46.9% and 45.6%, respectively, compared with CK. In summary, LED red light enhances the leaf area of rice leaves and antioxidant enzyme activity of rice leaves in addition to promote the dry matter accumulation of seedlings and the development of root system, and LED blue light can increase stem base width and seedling index for improving the morphology of rice seedlings and cultivating strong seedlings. This study provides a theoretical basis for optimizing the illumination parameters of rice planting.