播种密度对小麦茎秆大维管束系统和穗部发育的影响

研究了不同播种密度与小麦地上部伸长节间大维管束系统和穗部生产力之间的关系。结果表明：不同播种密度显著影响地上部伸长节间大维管束发达程度（大维管束数目和横截面积）和穗部生产力，其发达程度与穗部生产力呈显著正相关。播种密度的差异显著影响地上伸长节间茎壁厚度、节间长度和粗度及茎高，从而影响到小麦的抗倒能力。同时，不同播种密度也显著影响单位面积穗数、单穗结实粒数、单穗重及经济产量。

Effects of Sowing Density on Macro-vascular Bundle System of Culm and Spike Devlopment

The experiment Studied the relationship between different sowing densities and macro-vascular bundle system of elongated internodes, and spike productivity. The results were as follows: The Sowing density had significant influence on the development of macro-vascular bundle system of elongated initernodes (number and cross-section's area of macro-vascular bundle) developed extent were significantly positive correlation to spike productivity. Different sowing density had significant influence on thickness of culm wall,diameter and length of niternodes and culm,capacity of resistance to lodging,and also had significant influence on number of spike, grain number, grain weight and yield.