砂质脱潮土区不同冬小麦品种（系）抗倒伏特性研究
摘要
【Objective】 Lodging refers to the process that the crop shoots are displaced from their vertical stance. It is impacted by many factors including whether, crop varieties, soil type. The objective of this work is to experimentally study the variation of lodging between different winter wheat lines in a sandy fluvo-aquic soil in Henan province. 【Method】 The experiment was conducted in a field in which we compared 13 winter wheat lines. For each line, we measured the material properties and lodging resistance of its stems during the middle grain-filling stages under different agronomic managements. The relationship between the lodging resistance index (CLRI) of the second internode and nine culm properties was calculated using correlation, cluster and principal component analysis. 【Result】 Plant height and location of the gravitational center of the aerial parts had little impact on the lodging of the wheat in the middle grain-filling stage. The mechanical strength of the second internode of all lines was negatively correlated to the CLRI though not at a significant level. Plant height and the ratio of length of the second internode to plant height were both negatively correlated with the mechanical strength and the CLRI, both at significant level. The culm diameter, stem thickness and the ratio of stem thickness to culm diameter were all positively correlated with the mechanical strength and CLRI at significant level. Cluster analysis of Group I showed that reducing plant height and optimizing the second internode improved lodging resistance of the wheat, while the Group II analysis revealed that optimizing the traits of the second internode were equally effective. The result of Group III was that reducing plant height and increasing mechanical strength of the stems can also improve the lodging resistance. There were three principal component factors cumulatively contributing 83.72% of the principal component analysis, and the principal component factors (PCF) reflect