小麦非顺序衰老的生物学特征研究

Some biological characteristics of inverted senescing sequence of wheat leaves

以叶色倒置小麦为材料,通过对叶色倒置小麦中倒置茎和正置茎上一些重要的形态、生理和产量等指标的测定及比较。进一步研究小麦叶片非顺序衰老的生物学特性,探讨其理论意义和实践价值。结果表明,倒置茎上旗叶先于倒二叶衰老,与此相呼应,在结实后期旗叶的绿叶面积比<倒二叶绿叶面积比,旗叶叶绿素含量<倒二叶叶绿素含量,伴随这种生理变化下,倒置茎上籽粒的千粒干重和千粒体积都明显高于正置茎,籽粒千粒重显著重于正置茎,平均增重7.08%。这可引发人们对小麦衰老机制的二元化认识和思考,并为小麦新品种的培育提供新的思路和参考。

Leaf-color inverted wheat are used as material to survey and compare the important indexes of morph,physiology and production of the wheat so as to study the laws of inverted senescing sequence of wheat leaves and to reveal its significances in theory and practice.The results show that the flag leaf of the inverted sequence stem ages before the second leaf and consequently the flag leaf area and chlorophyll content are smaller than those of the second leaf in the latter period of its maturity.The physiological change causes the 1 000-kernel weight and the volume of the kernel are larger than those of the conventional sequence stem and the 1 000-kernel weighs highly more than that of the conventional sequence stem,increasing weight 7.08% by means.The dualization of the senescing mechanism of wheat needs more exploration.The paper intends to provide new method for the breeding of new varieties of wheat.