油桐北移引种幼苗越冬相关性状的遗传分析

初步探讨了油桐北移引种中幼苗越冬相关性状的广义遗传率（ｈ２Ｂ％）以及它们之间的遗传相关。结果表明，幼苗越冬率、种仁含油率、结果枝比率和平均冠直径的广义遗传率最高，分别为９９．１９％、９９．１３％、９９．０１％和９７．９０％，株均产籽量的广义遗传率最低，为１２．５３％。幼苗越冬率构成因素与越冬率的遗传相关系数分别是：结果枝比率为０．５５，株均产籽量为０．５９，干果出籽率为０．３８。通径分析结果表明，种仁含油率、干果出籽率和株均产籽量的直接作用分别为１．１５、０．５６和０．５４

Inheritance Analysis on Correlated Characters of the Overwintering Seedlings of Tung Trees Introduced Northward

A preliminary study was carried out on the general heritabilities (h 2 B%) and genetic correlations of the correlated characters of the overwintering seedlings of tung trees introduced northward.The results showed that the general heritabilities of the rates of winter survivals (99.19%) ,kernel oil-bearing (99.13%),fruit-bearing shoots (99.01%),and average crown diameters (97.9%) were very high. The general heritability of the mean nut output for each tree (12.53%) was the lowest one.The coefficients of genetic correlation between the rate of winter survivals and their components factors were as follows: the ratio of fruit bearing shoots, 0.55; average nut output for each tree, 0.5; nut producing rate of dried fruit, 0.38. The results of path analysis showed that the immediate actions of the oil bearing rate of the kernel,nut producing rate of the dried fruit and the mean nut output for each tree were 1.15, 0.56 and 0.54 respectively.