السلوك الوراثي والمظهري في الصفات الكمية لبعض أصناف من الحنطة (Triticum aestivum L.) وهجنها التبادلية النصفية

Abstract

A field experiment was carried out at the research station of the field crops departmentcollege of agricultureuniversity of Tikrit during (2011-2012 and 2013 winter seasons, includedcrossing according half diallel cross in the first season and evaluating parents and their crosses inthe second season to study the genotypic and phenotypic behavior for the traits: days to anthesis,plant height (cm), no. spikes. plant-1, no. grains. spike-1, 1000 grains weight (g) and individual grainweight. Results showed highly significant differences for whole studied traits, many parents havehigh significant means and agood combiner in many traits especially ACS-W-J19-9148 parents inplant height and grains. spike-1 , ACS-W-J14-9143 parent in days to anthesis and 1000 grain weightand ACS-W-J15-9144 in no.grains.spike-1 and individual grain weight. Many crosses have betterperformance and affected positively to wards desired direction of significant hybrid vigor (ACS-WJ19-9148 X sham 6) in no. grains. spike-1 and individual grain yield, (ACS-W-J15-9144) in 1000grain weight and individual grain weight. Whole traits were controlled by dominance type of geneaction and that adequate with the ratio of the degree of dominance which were more than one.Consequently heritability in narrow sense and expected genetic advance were low. The last twocrosses can be useful through the application of pedigree selection on the late segregationgenerations to improve bread wheat cultivars