陆地棉纤维品质性状的遗传力和显性度——1980—1985年估测结果综述

本文总结了1980—1985年间测定的陆地棉纤维长度、整齐度、纤维细度、纤维捻曲度、纤维强度、断裂长度等主要纤维品质性状的广、狭义遗传力(h_B~2·h~2)和显性度(H/D)~(1/2)的估值;结果显示这些性状大多具有中、低等遗传力,广狭义遗传力估值差异不大;这些性状的显性度,除纤维细度在6次测定中有1次达到1.55、断裂长度在1次测定中达到1.01以外,其余都在1.00以下,表明这几种性状大多属于部分显性,杂种优势不强。本文还对在估算遗传力估值中产生的偏倚进行了讨论,对在估算遗传参数中增加样本数和加强地区之间的协作,提出了建议。

HERITABILITY AND DEGREE OF DOMINANCE OF FIBER QUALITY CHARACTERS OF UPLAND COTTON (A SUMMARY OF 1980 - 1985 ESTIMATIONS)

Broad-(h_B~2) and Narrow-sense heritability (h~2) and Degree of DominanceH/D~(1/2) of fiber quality characters, including fiber Length, uniformity,Ifineness, twist, strength and break--length of upland cotton were estamatedfrom 1980 t0 1985. The results indicated that these these fiber characters showmedian to f Iow heritability, there were little difference between the estimatesof h_B~2 and h~2, The degree of dominance (H/D~(1/2) ), with exceptions in Iestimate out of 6 gets 1. 55 for fiber fineness,and in I determination gets 1.05for break-length, were all below 1.00 for other characters, this indicatedthat most of these characters showing partial dominance and that hybrid f vigorwere of no more importance.The bias that ordinary occur in the estimation ofheritabilty were discussed and suggestions for increase of sample size and forthe enhance--ment of cooperation between locations in the estimation of geneticparamaters were also emphasized in this paper.