大豆开花后光周期反应的研究

STUDIES ON THE POST FLOWERING PHOTOPERIODIC RESPONSES IN SOYBEAN

利用中国大豆主要生态区的生育期不同的代表品种研究了大豆（Ｇｌｙｃｉｎｅ ｍ ａｘ （Ｌ．）Ｍｅｒｒ．）开花后对光照长度的反应． 结果表明，不同成熟期的大豆品种开花后普遍存在着对光照长度的反应．这种反应属于典型的光周期现象，而不是由温度的替代作用、光合时间的改变或前期短日后效应引起的．开花后光周期反应不仅存在于大豆的花荚期，而且存在于鼓粒期．研究认为∶大豆开花结实对光周期的需求是一个连续过程；光周期对大豆生育期的调控作用存在于出苗至成熟的全过程；光周期诱导开花和促进成熟的作用有一定的共同性；

Typical varieties from the main ecological regions and of different maturity stages in China were chosen for studying the post flowering photoperiodic responses to day length in soybean (Glycine max (L.) Merr.). The results indicated that the response to post flowering photoperiod existed among all varieties with different maturity stages. The response was not due to of temperature effects, duration of photosynthesis or pre flowering photoperiodic after effect Instead, it was typical photoperiodism. The response was found not only at the stages of flowering and podding but also at the stage of seed filling. Experimental results proposed that the photoperiodic demand for flowering and fruiting in soybean was a continuous process.The regulation of photoperiod on growth lasted from emergence of seedlings to maturation. There were some common basis in photoperiodic effects on both flowering induction and maturation promotion. However, the effects of photoperiodic induction had after effect and were reversible.