Keywords : expected genetic advance


Genetical Analysis of Self-Fertilized Generation Variances in Two Durum Wheat Crosses

Nabeel T. Al-Badrany; Najeeb K. Yousif; Ghada A. Al-Hamdany

Rafidain Journal of Science, 2012, Volume 23, Issue 6, Pages 68-82
DOI: 10.33899/rjs.2012.59623

Phenotypic variance in parents and third generation were analyzed to estimate the additive genetic variance, dominance genetic variance, environmental variance, average degree of dominance, heritability in broad sense, heritability in narrow sense and expected genetic advance from selection in F3 generation, of two crosses in durum wheat (Triticum durum Desf.), the first cross between Azeghar-1 and Um-Rabie-5 and the second cross between Leeds and Waha for traits, heading time, flag leaf venation, plant height, peduncle length, number of spike, spike length, grain yield, 100 grains weight and number of grains per spike. Average degree of dominance revealed the different types of dominance for the studied traits, the values of narrow sense heritability were high for plant height, peduncle length, number of spikes, grain yield and number of grains per spikes in both crosses, spike length and weight of 100 grains in first cross, and flag leaf venation in second cross.

The Estimates of Heritability and Expected Genetic Advance by Using Analysis Generation Variances of Self – fertilizing Generations in Bread Wheat

Manal A. Hayalye

Rafidain Journal of Science, 2011, Volume 22, Issue 2, Pages 100-108
DOI: 10.33899/rjs.2011.32392

Four generations (F2 , F3 , Bs5 and Bs3) of two crosses in bread wheat , the first (S3- 69, S6 – 35) and the second (Germany X pandas), were used to study the components of variances , average degree of dominance , heritability and expected genetic advance form selction in the generations F2 , F3 , B1s and B2s for the quantitative traits : grain yield , number of per spikes , weight of 100 grains and number of grains per spike . The results of this study showed that the polygenes revealed over dominance for :
(1) number of spikes and weight of 100 grains in the two crosses . (2) grain yield and number of grains per spike in the first cross .
Broad and narrow sense heritabilities and expected genetic advance were high magnitude for some traits in the studied generations . Selection could used in the four generations to increase the frequency of desirable alleles for weight of 100 grains in the two crosses and recurrent selection could suggested to increase the frequency of desirable alleles for other traits .