早稻幼苗生长发育对不同波长蓝光的响应

Response of Early Rice Seedling Growth and Development to Different Wavelengths of Blue Light

为确定适合早稻工厂化育秧的蓝光二极管(LED)最佳补光波长,以白光LED为对照(CK),设置T1(400 nm)、T2(420 nm)、T3(450 nm)3种波长蓝光处理,研究不同波长蓝光对湘早籼24号幼苗生长发育的影响。结果表明,3种波长蓝光均能加快水稻幼苗的生长,较CK显著降低了幼苗株高和丙二醛含量,T3处理幼苗的叶面积、根长和壮苗指数最大,分别较CK增加14.04%、53.45%和60.00%。与CK相比,T3处理幼苗的叶绿素(a+b)、可溶性糖、淀粉、可溶性蛋白和脯氨酸含量分别增加37.81%、59.76%、68.80%、106.41%和38.54%。此外,T3处理幼苗的气孔密度较CK显著增加55.22%,同时也增强了幼苗的根系吸收能力和抗逆能力,使植株生长更健壮。综上,T3可作为早稻工厂化育秧的较佳补充光源。本研究结果为确立水稻工厂化育秧的精准补光技术提供了理论依据。

To determine the optimal supplementary light wavelength of blue light-emitting diodes(LEDs)suitable for early rice industrialized seedling cultivation,three blue light wavelengths[T1(400 nm),T2(420 nm)and T3(450 nm)]were set up with white LED as control(CK),and the effects of different blue light wavelengths on the growth and development of rice(Xiangzaoxian 24)seedlings were studied.Results showed that the three wavelengths of blue light could accelerate the growth of rice seedlings,and significantly reduce the seedling height and malondialdehyde content compared with CK.The leaf area,root length and strong seedling index of T3 were the highest,compared with CK,which were increased by 14.04%,53.45%and 60.00%,respectively.Compared with CK,the content of chlorophyll(a+b),soluble sugar,starch,soluble protein and proline in seedlings under T3 increased by 37.81%,59.76%,68.80%,106.41%and 38.54%,respectively.In addition,the stomatal density of T3 was significantly increased by 50.00%compared to CK,while also enhanced the root absorption capacity and stress resistance of seedlings,making the plant grow stronger.In summary,T3 could be used as a better supplementary light source for early rice industrialized seedling cultivation.This study provide a theoretical basis for establishing the targeted light supplementation technology of industrialized rice seedling cultivation.