品种类型与营养生长积温对小麦穗部性状的影响

大穗型，中间型和多穗型品种具有各自不同的穗、粒、重间的协调平衡关系。以高产为目标，最适穗容量平衡点呈多穗型＞中间型＞大穗型。营养生长基础对群体穗粒重的效应为多穗型＞大穗型＞中间型。穗粒数的增加是提高穗粒得的有效途径，增加小穗数／穗对高结实率品种 有效，减少不孕小穗数／穗对环境敏感型品种效应显著。

Effects of Varieties of Winter Wheat and Accumulated Temperature in the Vegetative Growth Period on Ear Characteristics

The big-ear,intermediate and multiple-ear vairieties of winter wheat differ in their individual coordinated relations among the number of ears, the number of kernels and the weight of kernels.So far as the best balance point of ear capacity to obtain high yield is concerned,the three varieties are found in the following order:multiple-ear varieties> interme diate varieties>big-ear varieties.The multiple-ear varieties are the highest for the effect of the basic conditions for vegetative growth on the weight of kernels per ear within the population,followed by the big-ear and the intermediate varieties.Increasing the number of kernels per ear proves to be an effective way to increasing the weight of kernels per ear.In creasing the number of spikelets per ear may affect the varieties which demonstrat higher seed setting rates.Decreasing the number of futile spikelets per ear can significantly affect the species sensitive to the environmental conditions.