Abstract:

Pure blue(BL) or red light (RL) were obtained by filtering blue or red fluorescent lamp light through plastic filters. With the same intensity of white light(WL) as control, the effects of light quality on the primary nitrogen assimilation of rice seedlings were studied. Irradiation for 2-6 h with BL promoted the uptake of NO-3, the induction of nitrate reductase (NR), and the increase of the NO-3 content in the etiolated seedlings.Seedlings grown under BL for 5-7 d had higher activities of NR, NIR (nitrite reductase) GOGAT (glutamate synthase) as well as GS (glutamine synthetase) than those under WL. However, for more than 10 days under BL, the levels of these enzymes became lower than those of the seedlings under WL. Compared with BL or WL, RL was less effective on the primary nitrogen assimilation.

光质对水稻幼苗初级氮同化的影响
邓江明* 宾金华 潘瑞炽**

（华南师范大学生物系，广州510631）

摘要： 用滤光膜过滤蓝色或红色荧光灯，得到纯的蓝光和红光，以白光为对照，研究不同光质对水稻（Oryza sativa L.）幼苗初级氮同化的影响。结果表明：蓝光促进水稻黄化幼苗吸收NO3-，增加体内NO3含量，并促进NR（硝酸还原酶）的诱导。在蓝光下生长5-7的幼苗的NR,NIR（亚硝酸还原酶）、GS（谷氨酰胺合成酶）和GOGAT（谷氨酸合酶）活性均高于白光下生长的，但第10天以后，白光下生长的幼苗酶活性最高。与白光和蓝光相比，红光对初级氮
同化的过程表现出抑制作用。
关键词： 光质；蓝光；红光；水稻；氮同化

Key words: light quality, blue light, red light, Oryza sativa, nitrogen assimilation