Bodzon Zbigniew
Plant Breeding and Acclimatization Institute, Radzików, Błonie, Poland.
J Appl Genet. 2004;45(1):49-59.
Phenotypic correlation coefficients and heritability of the characters controlling seed yield of long-raceme forms of alfalfa was determined. It was found that seed yield per plant, which was positively correlated with 10 out of 12 analysed characters, depended upon the number of pods per raceme and the number of seeds per pod. Variability of these characters determined about 60% of the variability of seed yield. Multiple linear regression and phenotypic correlations show that simultaneous selection for increased pod number per raceme and increased seed number per pod and raceme length resulted in enhanced seed yield potential. The share of the additive genetic effects in the phenotypic variance for number of pods per raceme was low and about 21-23%, while for number of seeds per pod and per raceme amounted to about 50%. The expected genetic progress in recombination breeding for number of seeds per pod and number of seeds per raceme will be of medium magnitude, while one cannot expect any rapid and considerable progress in the number of pods per raceme. Considering the high positive correlation between raceme length and number of pods and seeds per raceme, one should conclude that raceme length can be an important criterion in selection of plants showing a high seed productivity.
测定了紫花苜蓿长总状花序型种子产量控制性状的表型相关系数和遗传力。结果发现，单株种子产量与12个分析性状中的10个呈正相关，它取决于每个总状花序的荚果数和每个荚果的种子数。这些性状的变异性决定了种子产量变异性的60%左右。多元线性回归和表型相关性表明，同时选择增加每个总状花序的荚果数、每个荚果和总状花序长度的种子数，可提高种子产量潜力。每个总状花序荚果数的表型方差中，加性遗传效应的占比很低，约为21-23%，而每个荚果和每个总状花序的种子数的加性遗传效应占比约为50%。在重组育种中，每个荚果的种子数和每个总状花序的种子数预期的遗传进展将处于中等水平，而对于每个总状花序的荚果数，无法预期有任何快速且显著的进展。考虑到总状花序长度与每个总状花序的荚果数和种子数之间高度正相关，应该得出结论，总状花序长度可以作为选择具有高种子生产力植株的一个重要标准。
