INHERITANCE AND GENE ACTION FOR YIELD AND ITS ATTRIBUTES IN THREE BREAD WHEAT CROSSES (Triticum aestivum L.).

Abstract

The present investigation was carried out at El-Gemmeiza Agricultural Research station, Agricultural Research Center (ARC), Egypt during four successive seasons from 2007/2008 through 2010/2011. Three crosses were used among five parental varieties, namely P1xP2 (1), P3xP4 (2) and P4xP5 (3) five populations (P1, P2, F1, F2 and F3) for each cross were used in this investigation. Highly significant heterotic values in positive direction were found for all charcters except for plant height and 1000-grain yield in the first cross, spike length in the second cross, and plant height, No. of grains/spike and No. of spikes/plant in the third cross. Over domenance for all characters except plant height and 1000-grain weight in the first cross, spike length in the second cross and No.of grains /spike in the third cross was detected. Inbreeding depression was obtained in two out of three crosses for spike length, No.of grains/spike, No.of spikes/plant, 1000-grain weight and grain yield/plant and in one out of the three crosses for plant height. The important roles of both additive and non-additive gene actionwere found in certain studied traits. Significant positive F2 deviation (E1) were indicated for plant height in the third cross, No.of spikes/pant and grain yield/plant in the second and third crosses and 1000-grain weight in the first and third crosses. High to medium values of heritability estimates were found to be associated with high and moderate expected and actual gain in most traits. These obtained results indicated that, these traits could be used in the early generations, but would be more effective if postponed to late generations.

Estimation of Genetic Parameters for some Agronomic Traits, and Resistance to Stripe and Stem Rusts using Six Parameters Model in Three Bread Wheat Crosses

“…of kernels/spike in the second cross and 100-kernel weight in both of first and second crosses while none of the crosses exhibited positive or negative significant for No.of spikes/plant. These results agree with those obtained by Hassan et al (2013), Koumber and El-Gammaal (2012), Abd El-Aty et al Patel et al (2018).…”

“…However, both BC 1 and BC 2 mean values varied according to the character itself, which tended toward the mean of recurrent parent for the studied traits with some exceptions. Similar results were obtained by Manal H. Eid (2009), Koumber andEl-Gammaal (2012) andHamam (2013).…”

Genetic Analysis of Grain Yield Attributes and Protein Content in Bread Wheat Under Different Nitrogen Fertilization Levels.

“…The estimated values of (H2/4H1) however, were found to be less than (0.25) for number of spikes/plant at medium and normal nitrogen levels in addition to grain protein content at three nitrogen levels, indicating that positive and negative alleles were not equally distributed among the parents for these traits. Similar results were previously obtained by Koumber and El-Gammaal (2012).…”

Inheritance Pattern of Metric Characters Affecting Grain Yield in Two Bread Wheat ( Triticum Aestivum L. ) Crosses under Rainfed Conditions

“…Transgressive segregants for thousand-kernel weight and inbreeding depression for biomass, grain yield, grains per spike and spike number were observed in the F 2 generation. Koumber and El-Gammaal (2012) reported similar results. Broad sense heritability values were equal to or greater than 50% for the traits under study, suggesting possibilities for improvement through selection.…”