夜间补光对黄瓜幼苗激素含量及养分吸收的影响

为了明确夜间补光在育苗中的作用及机理，以‘津研四号’为试材，研究了夜间补光0、3、6、9和12 h对黄瓜幼苗生长、内源激素含量、根系活力及养分吸收的影响。结果表明：与对照（补光0 h）相比，夜间补光处理的黄瓜幼苗干重、叶面积、根冠比、壮苗指数、矿质元素积累量、吲哚乙酸(IAA)、赤霉素(GA3)、(ZR+GA3+IAA)/ABA和根系活力提高，脱落酸(ABA)含量降低，这些指标的升高（或降低）幅度随补光时间的延长而增大。黄瓜幼苗的玉米素核苷(ZR)含量补光时间的延长先增加后降低，补光6 h的最高。说明夜间补光能促进黄瓜幼苗生长，这与内源激素含量、根系活力及矿质元素积累量的改变有关。

Effects of Supplementary Illumination at Night on Hormones Content and Nutrient Absorption of Cucumber Seedlings

Effects of supplementary illumination 0, 3, 6, 9 and 12 h at night on growth, endogenous hormones content and nutrient absorption of cucumber (Cucumis sativus L.) seedlings (‘Jinyan 4’) were studied to probe the role and mechanism of supplementary illumination in breeding seedlings. The results showed that: compared with the control (supplementary illumination 0 h) dry weight, leaf area, R/S, seedling index, mineral elements accumulation, indole acetic acid (IAA), gibberellin (GA3), (ZR+GA3+IAA)/ABA and root activity increased under supplementary illumination, while abscisic acid (ABA) decreased, and the changes of these indicators were more pronounced as the supplementary illumination time prolonging. Zeatin riboside (ZR) content firstly increased, then decreased with the supplementary illumination time prolonging, and it is the highest when supplementary illumination time was 6 h. These results suggested that supplementary illumination at night can promote the growth of cucumber seedlings, and that was connect with the changes of endogenous hormone content, root activity and accumulation of mineral elements.