Quantitative inheritance of some wheat plant traits

Abstract

The objective of this study was to estimate gene effects and genetic variability for some quantitative traits of two winter wheat crosses (Soissons/Zitarka and Soissons/Sana) by generation mean analysis. In most cases a digenic epistatic model was sufficient to explain variation in generation means. The additive-dominance model was adequate for plant height and grain weight per spike of the longest culm. In two cases (grain yield per plant and single grain weight) these models failed to explain variation in generation means, implying the presence of higher order interactions or interactions between linked loci. Dominance effects and additive x additive epistasis were more important than additive effects and other epistatic components. Only complementary type epistasis was observed.The estimated values of narrow-sense heritability (h 2 n ) varied for plant height (54-81%), number of heads per plant (9-76%), number of grains per spike (11-99.8%), grain weight per spike (23-73%), grain yield per plant (21-78%) and single grain weight (49.7-72%). The adequacy of certain modes of inheritance as well as the importance and significance of gene effects and genetic components of variance for analyzed traits were dependent upon the particular crossing combination and experimental site.

Gene actions involved in the inheritance of yield related traits in bread wheat (Triticum aestivum L.)

“…These results are in agreement with those obtained by Fatehi et al (2008) and Khattab et al (2010), who also observed the presence of duplicate type of epistasis in the inheritance of plant height. Contrary to these results, the presence of non-allelic gene interaction caused by complementary genes was indicated Novoselović et al (2004). In the cross combination Pobeda/Partizanka, the less favorable case of duplicate type of epistasis was observed, as the value of epistatic effects dominance×dominance (l) was negative.…”

Genetic parameters estimation in quantitative traits of a cross of triticale (x Triticosecale W.)

“…Means within a column followed by the same letter are not significantly different at the 0.05 probability level Unauthenticated Download Date | 5/8/18 9:48 PM generations and thus increase the chances of success in the improvement (Novoselović et al 2004;Ljubičić et al 2016).…”

“…These results are in accordance with reports published by other authors in wheat (Bnejdi and El Gazzah 2010;Erkul et al 2010;Dvojković et al 2010;Sultan et al 2011;Abd El-Rahman 2013;Amin 2013). The negative dominance variance for SP, SS, HW and GY may be due to micro-environmental variations, sampling errors and / or the fact that the basic generations are inefficient to determine the variance of dominance in the analysis (Novoselović et al 2004;Dvojković et al 2010). Snape (1987) points out that it is common to find non-significant additive effects and significant effects of dominance for yield and its components, as it occurs in the present study with the GY, SS, HW and SP.…”

Gene effects for different metric traits under normal and high temperature stress environments in wheat (T. aestivum L. Em Thell)

“…Likewise additive x additive (i) effects were found for grain yield per plant (E1), number of grains per spike (E2), for number of grain per spike (E1), peduncle length (E2), number of tillers per plant (E2) in PBW 343 x PBW 435 , for 1000-grain weight in UP 2565 x UP 2425, peduncle length (E2) in PBW 343 x WH 283 and for number of grains per spike (E1) in PBW 343 x WH 542. Both the additive as well as additive x additive gene effects being fixable (Novoselovic et al, 2004;Kaur and Singh, 2004) simple pedigree method followed by simple selection in crosses like PBW 343 x PBW 435, UP 2565 x UP 2425, PBW 343 x WH 283 and in PBW 343 x WH 542 will be useful for improvement of traits governed by such gene effects. However, for improvement of traits governed by dominance gene effects and, additive x dominance and dominance x dominance digenic interactions with prevalence of duplicate epistasis, some sort of intermating followed by selection in later generations will be advisable (Prakash, 2005;Singh and http://www.publish.csiro.au/journals/spjns Pawar, 2005) as release of additional genetic variability may express more additive and additive x additive effects.…”