新疆向日葵品种产量敏感性分析

Sensitivity analysis of sunflower yield from Xinjiang

为保证高产,调查影响产量的性状。从新疆向日葵品种中选择8个品种,对其9个主要性状与产量的遗传相关性和通径系数进行了分析,结果表明:百粒重、茎粗、盘径和结实率等4个性状变量与产量显著相关,对产量的直接影响系数分别为0.8158、-0.8677、0.4563和0.2002;间接影响系数在-0.1022~0.8982之间。在遗传相关分析的基础上进一步再进行通径分析表明,百粒重、结实率和盘径是影响产量最敏感的三个变量;株高、叶数、单盘粒数则对向日葵产量表现出较低的敏感性。因此初步认为在向日葵育种中,为保证高产首先要选择增加百粒重,适当重视选择盘径大、茎秆细的品种,同时兼顾其它性状,协调好各性状的关系。

For high yield breeding,genetic correlation and path coefficient between 9 main agronomic characteristics and yield of Xinjiang sunflower were analyzed.Results showed that hundred grain weight,stem diameter,disc diameter and seed setting rate were associated significant correlation with yield,their direct influence coefficiences were 0.8158,-0.8677,0.4563 and 0.2002 respectively,and their indirect influence coefficiences were between 0.1022 to 0.8982.Path analysis showed that hundred grain weight,seed setting rate and disk diameter were the most sensitive variables in factors on yield.But plant height,leaf number and single plate grain number showed less sensitivity to seed yield.Therefore,in order to improve high yield in sunflower breeding,the first important trait should be considered as higher hundred grain weight.Others should be large sunflower plate diameter and appropriate fine stalks varieties.