Agronomy Department, Faculty of Agriculture, Alexandria University, Egypt.
Theor Appl Genet. 1971 Jan;41(3):100-3. doi: 10.1007/BF00277750.
Variability, covariability, heritability, and expected genetic gains from selection for heading date, plant height, and kernel weight were estimated in progenies derived from six wheat crosses. The crosses differed in the magnitude of the genetic variabilities of their progenies, but all crosses had significant variabilities for all traits. Heritability estimates were calculated by the variance components method. The estimates of heritability were relatively high for all three traits and averaged 86% for heading date, 77% for plant height, and 70% for kernel weight. The presence of significant genetic variabilities and high heritability estimates indicated that selection would be effective for the three traits.The segregates derived from crosses between medium tall parents showed transgressive segregation that would permit isolation of short-statured types. Transgressive segregation also occurred for heading date and kernel weight.Heading date and plant height were positively and highly significantly correlated in four crosses out of six. But both plant height and heading date had, in general, low negative correlations with kernel weight which would not preclude the development of short wheats with high kernel weight from these crosses. The association between characters was mostly genetic in cause.
在六个小麦杂交后代中，对抽穗期、株高和千粒重的变异性、协变性、遗传力和选择预期遗传增益进行了估计。这些杂交种在后代的遗传变异性大小上存在差异，但所有杂交种在所有性状上都具有显著的变异性。遗传力估计值是通过方差分量法计算的。这三个性状的遗传力估计值都相对较高，平均抽穗期为 86%，株高为 77%，千粒重为 70%。三个性状均存在显著的遗传变异性和较高的遗传力估计值，表明选择对这三个性状是有效的。从中等高度亲本杂交产生的后代显示出超亲分离，这将允许分离出矮秆类型。抽穗期和千粒重也发生了超亲分离。在六个杂交中的四个中，抽穗期和株高之间呈正相关，且高度显著。但一般来说，株高和抽穗期与千粒重呈负相关，这不会排除从这些杂交种中选育出具有高千粒重的矮秆小麦。性状之间的关联主要是遗传上的原因。
