小麦穗分化过程中的光温组合效应研究

在Ｃｏｎｖｉｒｏｎ生长箱控制条件下，利用６个来自不同生态区的春小麦品种，研究了４种光温组合下（高温长日，高温短日，低温长日，低温短日）穗人化期持续天数与积温的反应，结果表明，日照对缩短各穗分化期起主要作用。（２）温度对光周期反应有强烈的调节作用，主要表现，长日照下。高温加快生育进程，短日照下，高温使短日抑制穗分化效应更为显著，常导致幼穗中途死亡，低温虽然延缓了小麦的生育进程，但却可以减轻短日对穗分

Studies on the Combination Effect of Temperature and Daylength on Spike Differentiation of Wheat

In Conviron growth cabinet, six spring wheat cultivars coming from different ecological regions of China were chosen to study the response of spike differentiation under four photo-thermal combinations (that is, high temperature long daylength, high temperature short daylength, low temperature long daylength, low temperature short daylength respec tively). The result was as follows. (1) After vernalization requirement was fulfilled, photoperi- odism was the decisive factor controlling the differentiation process no matter how the photo- thermal combination changed. (2) Temperature had significant regulation roles as follows: High temperature stimulated the enhancing effect of long daylength and the inhibiting effect of short daylength, which may lead to the death of young spike. Under short daylength, low tempera ture could sustain the differentiation process though development was delayed significantly. (3) The thermal time required for glume differentiation in different photo-thermal condition was showed that; high temperature and short daylength>low temperature and short daylength> high temperature and long daylength>low temperature and long daylength. The thermal time was less changed with different temperatures under long daylength and/or non-photosensitive cultivars.