大粒小麦品种86(79)生理特点及其与穗粒重的关系

以大粒小麦品种86（79）、中粒小麦品种豫麦41号为材料,在河南生态条件下,研究了大粒小麦品种生理特点及其与穗粒重的关系。结果表明,大粒小麦品种净同化率高,灌浆期叶片叶绿素、总糖、全氮含量高,光合速率高,茎鞘中总糖、全氮含量高,但下降快,碳水化合物运输受阻,后期氮素相对缺乏;大粒品种粒重增长快,子粒中蛋白质含量高,变化平稳,不受子粒积累碳水化合物的影响;大粒品种后期灌浆不充分,子粒饱满度差,子粒中GA3／ABA与子粒灌浆速率呈显著的正相关,而旗叶与子粒中GA3／ABA的相关性不显著。

The relationship between physiological characteristics and spike grain weight of big kernel wheat variety 86(79)

The research was carried out under the ecological conditions in Henan on the relationship between physiological characteristics and spike grain weight of big kernel wheat variety by using big kernel wheat variety 86(79) and medium kernel wheat variety yumai 41 as test materials. The main results are as follows:The big kernel wheat has higher photosynthetic productivity, the content of chlorophyll,total carbohydrate and total nitrogen in leaves were higher at filling stage. The content of total carbohydrate and total nitrogen in stems was higher, but dropped fast, the carbohydrate transport was blocked, the nitrogen was lacking at late stage.The grain weight of big kernel wheat increased quickly, the content of kernel protein was higher, varied steadily and wasn't affected by the accumulation of carbohydrate.Grain filling of big kernel wheat wasn't sufficient at late stage, the plumpness of the seeds was poor. It presented significant positive correlation between the rate of GA 3/ABA in kernel and grain filling rate, but the correlation of rates of GA 3/ABA in flag leaf and in kernels wasn't significant.