Estimation of Some Genetic Parameters for phenological, Morphological and productivity Traits in Two Bread Wheat Crosses


Abstract in English

The experiment was grown in a Randomized Complete Blocks Design with three replications during two seasons. Generations means analysis method was used to study the genetic parameters for number of days to heading, number of days to maturity, plant height, number of spikes per plant, number of grains per spike and grain yield per plant of two bread wheat crosses Triticum aestivum L. (Gairwel7 x Douma4), (Azaz1 x Soued), Results have shown that both additive and dominance genetic effects were high significant in most evaluated traits, with predominance of the dominance genetic effects’ values. Also, epistatic genetic effects have contributed to inheritance of most studied traits. The signs of dominance and dominance x dominance were opposite in most examined traits indicating duplicate epistasis for all studied traits of the first cross and for number of days to maturity, plant height and number of grains per spike of the second cross, that indicates that the selection for these traits should be delayed after several generations. High phenotypic variations were composed of high genotypic variations and less of environmental variations, indicating the presence of high genetic variability for different traits and less influence of environment. Highly significant heterosis relative to mid and better parents in F1 was recorded for most characters, accompanied with inbreeding depression for all traits in F2. Narrow sense heritability and genetic advance were low in most cases due to the dominant of non-additive genetic action in controlling the genetic variation of the most studied traits.

References used

Abd El-Majeed, S. E. A. 2005. Heterosis and combining ability analysis for yield and its components in durum wheat (Triticum durum, Desf.). Fayoum J. Agric. Res & Dev, 19 (1): 1-7
Abd El-Rahman, M. E. 2013. Estimation of Some Genetic Parameters through Generation Mean Analysis in Three Bread Wheat Crosses. Alex. J. Agric. Res, 58(3): 183‐195
Abd El-Rahman, M. E. and S.M. Hammad. 2009. Estimation of some genetic parameters for some agronomic characteristics in three crosses of bread wheat. J. Agric. Sci. Mansoura Univ, 34(2): 1091-1100
Abul-Nass, A. A., M. A. Mahrous and A. A. El-Hosary. 1993. Genetical studies on grain yield and some of its components in barly (Hordeum vulgar L.) Egypt j. Agron, 18 (1-2): 33-46
Allard, R. W. 1960. Principles of plant breeding. New York, John Wiley, PP. 485

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