滇龙胆主要农艺性状的相关及通径分析

目的:研究滇龙胆植株根部产量与各农艺性状间的相关性,为滇龙胆优良种源的筛选及培育提供重要参考依据.方法:以云南26个野生种群的滇龙胆种质资源为研究对象,对其12个性状(根粗、根长、根数、根干重、茎粗、株高、一级分枝数、叶长、叶宽、叶长宽比、花萼长、花萼裂数)进行相关性、多元回归及通径分析.结果:相关性分析表明,地上部分多个 性状均与根长、根粗、根数、根干重有显著(P＜0.05)或极显著(P＜0.01)的正相关.多元逐步回归分析表明,根粗、根长、根数、株高、分枝数及花萼裂数是影响根干重的主要因子.通径分析结果表明,根粗、根长、根数对根干重的直接正影响较大.地上性状中,株高、一级分枝数对根干重直接正影响较大.结论:在实际生产及良种选育过程中,应关注植株较高大、主茎粗壮、一级分枝数多,植株呈丛生状的材料.

Correlation and path analysis on agronomic traits of Gentiana rigescens

Objective : The interrelation of yield and agronomic traits of Gentiana rigescens was studied for the germplasm and breeding variety of this species. Method : Twelve agronomic traits, root diameter, root length, root number, root biomass, stem diameter, plant height, the first branch number, leaf length, leaf width, leaf length/leaf width ratio, calyx length, and calyx number of G. rigescens from 26 wild populations in Yunnan were determined for correlation analysis, multiple stepwise regression analysis and path analysis. Result : Correlation analysis showed that there were significantly positive correlation between the traits of aboveground part and the length, diameter, number, and biomass of the root. Multiple stepwise regression analysis showed that length, width, and number of root, plant height, the first branch number, and the calyx number were the main factors that affected the root biomass. Path analysis showed that the diameter, length, and number of the root, the stem height, and the first branch number had a direct positive effect on the root biomass. Conclusion : The traits, such as high and strong stem, high number of first branch number and shrubby shape could be selected for the breeding and high yielding of G. rigescens.