矮生菜豆豆荚产量构成因素的通径分析

以8个矮生菜豆品种为材料，研究了单株豆荚产量与其主要构成因素的关系，结果表明，单株豆荚产量及作为豆荚产量构成因素的主茎高、分枝数、花序数、豆荚数、豆荚长和豆荚重在品种间均存在极显著的差异；但这些产量构成因素与单株豆荚产量之间，无论是表型相关系数还是遗传相关系数或是环境相关系数均未达到显著水平。通径分析结果显示，一个与单株豆荚产量关系密切的性状。其对单株豆荚产量的效应总是由于存在一个或多个负向的间接通径系数而被削弱。从而掩盖了该性状对单株豆荚产量的遗传效应，从表型和遗传通径系数看，对单株产量最为重要的是单株结荚数及单株花序数。单株分枝数、主茎高和豆荚重其次。豆荚长则较为次要。根据通径分析结果，就矮生菜豆丰产性育种中各有关性状的选择进行了讨论。

Path Coefficient Analysis of Pod Yield and Its Components in Phaseolus vulgaris L. Var. humilis Alef.

In order to study the relationship between pod yield and its correlated characters (including stem high, number of branches and inflorescences and pods, pod length and pod weight), eight cultivars of dwarf French bean (Phaseolus vtilgaris L. var. humilis Alef.) are used with random block design. The main results are as follows. Significant difference existes among these cultivars for all seven characters mentioned above. But no significance of correlation coefficient of phenotype and genotype or environment between pod yield per plant and its seven correlated characters is found. Path coefficient analysis shows that one character which correlates to pod yield closely, indicates a little direct effect to pod yield because of one or more high negative indirect path coefficient. These negative indirect path coefficients cover up the genetic effect of this character to pod yield. Considering the phenotypic and genotypic path coefficient, number of pods and inflorescences are the most important characters to pod yield, number of branches, stem high and pod weight are secondary, and pod length is less important. High pod yield selection method in dwarf French bean is discussed.