不同陆地棉品种脱叶性与农艺性状相关性分析

Correlation Analysis of Leaf Defoliation and Agronomic Traits of Different Upland Cotton Varieties

通过研究30个陆地棉品种脱叶率与农艺性状的相关性,明确脱叶性与农艺性状的关系,对脱叶率及挂枝率进行差异分析,筛选出脱叶性及农艺性状优良的品种。研究结果发现脱叶率与株高、始节高、始节数存在正相关,总叶片数与脱叶率存在显著正相关,果节数与脱叶率存在负相关,有效果枝数与脱叶率存在显著负相关,挂枝率、叶绿素SPAD值与脱叶率存在极显著负相关,结果显示除脱叶率、挂枝率性状外,总叶片数、有效果枝数shows叶绿素SPAD值可作为评价品种脱叶能力性状的关键参考性状。参试陆地棉品种脱叶率差异较大,最终筛选出综合脱叶性状较好的3个品种,包括‘新陆中14’、‘新陆中15’、‘新陆中40’。本研究为适用于机械采收的棉花脱叶性种质资源创制及脱叶性状指标建立提供参考。

By studying the correlation between the defoliation rate and agronomic traits of 30 upland cotton varieties,the relationship between defoliation and agronomic traits was clarified,and the difference between the defoliation rate and the hanging branch rate was analyzed,and the varieties with excellent defoliation and agronomic traits were screened out.The results of the study found that there is a positive correlation between the defoliation rate and the plant height,the height of the first node,and the number of the first node,the total number of leaves has a significant positive correlation with the defoliation rate,the number of fruit nodes has a negative correlation with the defoliation rate,and the number of effective branches is correlated with defoliation.There is a significant negative correlation between the rate of hanging branches,the SPAD value of chlorophyll,and the rate of defoliation.The results shows that in addition to the traits of the rate of defoliation and the rate of hanging branches,the total number of leaves,the number of effective branches,and the SPAD value of the chlorophyll can be used as the key reference traits for evaluating the traits of defoliation ability of varieties.The defoliation rate of the tested upland cotton varieties was quite different,and finally three varieties with better comprehensive defoliation characteristics were screened,including'Xinluzhong14','Xinluzhong15','Xinluzhong40'.This study provides a reference for the creation of cotton defoliation germplasm resources suitable for mechanical harvesting and the establishment of defoliation trait indicators.