玉米和狗尾草光周期敏感性的比较研究

光周期是影响植物生长发育的关键因素之一。玉米和狗尾草都是短日照禾本科植物,且都具有光周期敏感性。对玉米和狗尾草的光周期敏感性比较研究,探索易于研究的狗尾草光周期敏感性机理,借以解析玉米光周期敏感性反应的机理。以玉米自交系CML288、黄早四和狗尾草自交系A10为材料,研究在长日照、短日照和在不同生育时期长短日照相互挪移处理下的光周期反应。结果表明,玉米和狗尾草在长日照条件下都表现出营养生长旺盛和生育期延迟,二者在长日照条件下的光周期敏感阶段都比短日照条件下的光周期敏感阶段长;玉米在进入光周期敏感期之前有一段时间的光周期钝感期,而狗尾草从发芽出苗就直接进入光周期敏感期。两个光周期敏感程度不同的玉米自交系比较,光周期敏感自交系CML288比光周期相对不敏感自交系黄早四的光周期敏感阶段长。

Comparative Study on the Photoperiod-Sensitive Between Maize and Setaria viridis

Photoperiod sensitivity of flowering time is an important consideration in plant cultivation and breeding.Maize and Setaria viridis are short-day grass plants, and they have close genetic relationship. With maize inbredlines CML288, Huangzao4 and Setaria viridis inbred line A10, we studied the photoperiod under short daylight andlong daylight, and using reciprocal transfer between long-day(LD) and short-day conditions(SD). For resolving themechanism of photoperiod-sensitive of maize, and in order to explore the mechanism of photoperiod-sensitive of S.viridis, the comparison of photoperiod-sensitive between maize and S. viridis were studied. The results showed thatmaize and Setaria viridis both had photoperiod-sensitive, vigorous vegetative growth and growth phase were lengthened.The stage of photoperiod-sensitive under long daylight was longer than short daylight. Maize had a photoperiod-insensitive stage before photoperiod-sensitive. However, Setaria viridis directly produced photoperiod-sensitivefrom germination. The stage of photoperiod-sensitive in CML288 was longer than Huangzao4.