【摘要】 【目的】研究不同光质暗间断后对玉米生长发育的影响。【方法】选用对光周期敏感的热带玉米自交系CML288为材料,保证每天9 h的自然光照。在植株发育的不同时期,于15 h暗期分别用白光、红光和远红光进行30 min曝光(NB),处理不同时间(d)后统计玉米的抽雄期、吐丝期和株高。【结果】在玉米不同发育时期开始暗间断(NB)处理,与对照相比,抽雄期和吐丝期均有不同程度滞后,株高均有所降低,且5叶期时开始处理,抽雄期和吐丝期滞后最多,两者平均较对照晚11 d;株高也最低,较对照降低了38.1 cm。红光对抽雄期和吐丝期推迟的作用最大,其次是白光,远红光的效应最小,且远红光能够部分抵消红光的效应。【结论】暗间断对CML288的最大效应发生在5叶期,CML288是实际上的短日植物;光敏素可能是暗间断影响玉米生长发育过程的光受体。更多还原

【Abstract】 【Objective】 Alteration of maize growth and development was studied after Night-break(NB) treatment using different light quality.【Method】 A tropical photoperiod-sensitive maize inbred line CML288 was grown under daily cycles of 9 h light/15 h night.The plants were exposed under 30 min of fluorescent white light(WL),Red light(R) and Far Red light(FR) in the middle of 15-h night at different development stages,and days to tasselling,days to pollenning and plant heights were calculated after treatment.【Result】 The results showed that night break(NB) caused a clear delay in days to tasselling and days to pollenning and inhibited the plant height.When NB was treated at the stage of 5-leaf period,days to tasselling and days to pollenning were the latest,the plant height was the lowest compared with the control.Days to tasselling and days to pollenning were 11 d later,plant height was 38.1 cm shorter than the control.Inhibition effect of R on days to tasselling and days to pollenning was the maximum,then the WL,and the FR effect the minimum.FR could partly reverse R effect.【Conclusion】 NB-max effect on CML288 occurred at the stage of 5-leaf period and CML288 was actually a short-day plant.Phytochrome might be the photoreceptor in the NB effects on growth and development of maize CML288.更多还原