engleski

Estimation of some Genetic Parameters through Generation Mean Analysis in Two Winter Wheat Crosses

The objective of this study was to estimate some genetic parameters for three important quantitative traits (grain yield components) in two winter wheat crosses (Divana/Srpanjka and Soissons/Žitarka). Eight generations (namely ; P1, P2, F1, F2, Bc1.1. (P1xF1), Bc1.2. (P2xF1), RBc1.1. (F1xP1) and RBc1.2. (F1xP2)) were raised and subjected to generation mean analysis for detecting the nature of gene effects responsible for inheritance of kernels number, single grain weight and mass of grains per spike of the longest culm. Digenic epistatic model was adequate to explain variation in generation means for single grain weight in Divana/Srpanjka and for mass of grains per spike in Soissons/Žitarka crossing combinations. Additive gene effects were more important for mass of grains per spike in Soissons/Žitarka cross, while dominance and epistatic gene effects were predominant in controlling inheritance of single grain weight in Divana/Srpanjka cross. For number of kernels in both crosses, single grain weight in Soissons/Žitarka and mass of grains per spike in Divana/Srpanjka crossing combinations digenic epistatic model failed to explain variation in generation means, implying more complex nature of inheritance and/or influence of the environment on the expression of those traits. The estimated values of narrow-sense heritability was higher for mass of grains (0, 50-0, 52) than number of grains (0, 42-0, 35) and single grain weight (0, 29-0, 41). From breeder's point of view better chances for improvement based on esitmated heritability in narrow-sense and estimated gene effects for studied quantitative characters, offers crossings with predominant influence of additive (fixable) components.

winter wheat; generation mean analysis; inheritance; gene effects; heritability

Radi potpunosti zapisa, molim unesite ISBN zbornika, admin (2007-06-06)