棉花产量性状的相关及通径分析

以棉花染色体片段代换系(CSSLs)为材料,对棉花农艺性状及产量性状进行相关与通径分析。结果表明:产量与单株铃数、单铃重、株高、果枝数的相关系数分别为0.937、0.327、0.275、0.265,均达极显著正相关,这表明增加铃数、果枝数,提高铃重、株高是获得较高产量的基础。通径分析表明单株铃数对皮棉产量有最高的直接效应(通径系数为0.8960),其次为铃重(通径系数为0.3729)。因而,棉花高产育种中应注重植株中等偏高、果枝始节低、果枝数多、铃多铃大性状的选择。

Correlation and Path Analysis of Cotton Yield Characters

Using chromosome segment substitution lines as materials,the correlation and path analysis on yield characters and agronomic characters of cotton were conducted.The results showed that the lint yield significantly positively correlated with boll number per plant(r=0.937**),single boll weight(r=0.327**),plant height(r=0.275**) and number of fruit branches(r=0.265**),which indicated that the increase of them was the base for increasing lint yield.The path analysis showed that the direct effect of boll number per plant was the highest on lint yield with the path coefficient as 0.8960,which was followed by single boll weight with the path coefficient as 0.3729.In conclusion,the middle-high plant height,lower initial fruit branch,more fruit branches,more bolls and larger boll size should be payed more attention to during high-yielding cotton breeding.