مطالعه ژنتيكي برخي صفات گندم در شرايط تنش خشكي با استفاده از تجزيه ميانگين نسلها

Genetic assay of some traits in wheat (Triticum aestivum L.) under drought stress condition using Generation Mean Analysis

Awareness of gene action of traits is very important in plant breeding methods. Generation mean analysis (GMA) using parents. (PI & P2) and their progenies (Fl, F2, BC1 & BC2) in two mating groups was used to study the type of gene action and the best genetically model of traits under drought stress condition. The experiment was conducted using a randomized complete block design with three replications for each mating group. Generation mean analysis was performed using Mather and Jinks model and joint scaling test. The nine traits included spike length, spike number, pedancle length, awn length, grain yield, plant height, spike weight, grains per spikes and 100 grain weight were evaluated. The analysis showed disagreement of additive-dominance model for all traits, resulted that there is epistatic non-allele interactions between the genes of each trait. The distribution of traits was continuous in F2 and backcrossed populations, as a reason for polygenic inheritance of the traits. For the majority of the traits, additive gene effect was significant, but its magnitude was less than dominant gene effect. The amount of h/d for many traits such as grain yield was high (h/d>l), indicated the predominance of dominant gene effects in Fl progeny.