Estimation of combining ability and genetic variance using the half diallel cross in wheat (Triticum aestivum L.)
ANBAR JOURNAL OF AGRICULTURAL SCIENCES,
2008, Volume 6, Issue 2, Pages 59-70
AbstractCollege of Education for women University of Al-Anbar
Six genotypes of wheat were crossed in half diallel. The grains of parents and (F1) crosses were sown using randomized complete block design (R.C.B.D) with three replications. The studied characters were: number of days from planting to 50% flowering, number of days from planting to maturity, spike length/ cm, fertility%, number of spiklet/ spike, number of flowers per spike, and yield of single plant per gram, the parents (Tamooz, Alkaeed, Ipa (99), Sham (6), saber beg, Abu-graib) and it's F1 crosses differed significantly for all characters, The parents were generally combined in desirable direction for several characters, while the specific combining ability was significant only for number of days from planting to 50% flowering and to maturity characters respectively, Variance of specific combining abilities was more than variance of general combining abilities for number of days to flowering and to maturity and for yield of single plant characters while variance of general combining ability more than variance of specific combining abilities for spike length, fertility, number of flowers per spike, and number of spiklet per spike characters.
The additive gene action was more affective from the dominance gene action for all characters which were studied except yield of single plant/ gm, The narrow- sense heritability values were ranged between 52.77% for spike length/ cm to 91.73% for number of days from planting to maturity while the broad sense of heritability values were ranged between 10.67% and 76.61% for single plant yield/ gm and number of flowers/ spike, respectively, The average degree of dominance was higher than one for number of days to 50% flowering and to maturity and single plant yield characters, which revealed over dominance but less than one for another characters such as spike length, fertility, number of flowers/spike and number of spiklet per spike, which revealed dominance, with additive gene action.
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