不同波长蓝光LED对两个品种水稻秧苗生长的影响

Effects of different blue LEDs on the seedling growth of two rice cultivars

关键词:  育秧, 蓝光LED, 水稻幼苗, 生长

Key words:  cultivating seedlings, blue LEDs, rice seedling, growth

摘要:

传统的大田育秧方式容易受到自然条件的影响,如在连续的阴雨天容易导致烂秧,而采用人工可控的工厂化育秧则有助于解决此类问题。LED光源具有光质纯、光效高以及低能耗等优势,是一种有望在工厂化育秧中应用的人工光源。该研究以生长特性差异明显的水稻天优998(籼稻)和圣稻14(粳稻)为材料,在光强为(60±5)μmol·m^-2·s^-1、光周期为12 h·d^-1的条件下,以450、470和490 nm 3个波长的蓝光LED照射天优998和圣稻14秧苗,考察了不同波长蓝光对两个品种的三叶期和五叶期水稻秧苗生长的影响。结果表明:蓝光处理下两个品种、不同秧龄幼苗的壮苗指数、根系活力和根数增加,体内碳、氮代谢活性增强,抗氧化物酶活性也会增加。3个波长的蓝光对两个品种、不同秧龄水稻秧苗生长的影响存在差异,450 nm照射下水稻秧苗的各项生长指标较优,生产上育秧可根据秧龄选择450 nm或490 nm作为独立和组合光源。

Abstract:

Traditional method of cultivating seedling in the field would be more susceptible to natural conditions, especially in the consistent rainy days. It is effective to solve this problem by industrialized rice seeding. LED is a promising light source to be used in the seedling factory due to its advantages of light quality, light effects and low-power consumption. To investigate influence of different blue light on the growth of three-leaf stage and five-leaf stage rice seedlings. Seedlings of Tianyou 998(Indica)and Shengdao 14(Japonica)were exposed to the illumination of three blue light LEDs(450, 470 and 490 nm)under following condition: light intensity(60±5)μmol·m^-2·s^-1, photoperiod 12 h·d^-1. Then, multiple growth index were evaluated. The results showed that under blue LEDs treatment, in two rice seedlings of different ages, sound seedling index, root activity and root number increased, carbon and nitrogen metabolic activity enhanced, as well as the antioxidase activity. Although three blue LEDs treatments have different influences on the growth of two rice seedlings with different age, rice seedlings grew better under 450 nm illumination. The present results suggested that 450 nm or 490 nm LEDs could be selected as an independent or mixed light source for cultivating rice seedling in practice.