小麦基部节间茎秆密度与抗倒性关系的研究

为了给小麦抗倒性的评价提供简便易行的指标,以抗倒性不同的20个小麦品(系)为材料,研究了抽穗至成熟期茎秆基部第二节间鲜、干密度的变化特点,以及鲜、干密度与产量性状及其他形态与生理指标的关系。结果表明,小麦茎秆抗倒性强弱与基部节间茎秆鲜干密度值的大小密切相关;鲜密度随灌浆过程的进行基本呈递减趋势,在蜡熟期最低;在灌浆中期干密度较高但变化幅度较大的品种抗倒性较差。基部第二节间茎秆鲜、干密度与茎秆机械强度、单株鲜重、基部节间鲜干重、壁厚等形态生理指标呈极显著正相关,与倒伏指数呈极显著负相关,与不孕小穗数、单位面积穗数等产量性状呈极显著负相关。因此,直接利用基部节间茎秆鲜、干密度来评价小麦品种的抗倒性是可行的,通过提高基部节间茎秆的干密度可以实现抗倒性和产量的同步提高。

Relationship between Bending Property and Density of Wheat Stem

[ Objective] The aim is to research the relationship between bending property and density of wheat stem. [ Method ] The bending properties such as elastic modulus, bending strength, flexural rigidity, moment of inertia, density and water content of the second base internodes of Zhengmai 9023 and Yumai 25 were determined. [ Result] The results show that during filling stage, there are significant differences in the elastic modulus, moment of inertia, flexural rigidity and density among wheat varieties, while there are no significant differences in the bending strength and water content among wheat varieties. The moment of inertia, flexural strength and flexural rigidity have positive relationship to density but negative relationship to water content. [ Conclusion] The study results provide some references for the research on high yield cultivation and lodging resistance of wheat.