GENETIC STUDIES ON WHEAT EARLINESS
Abstract: Six populations; P1, P2, F1, F2, BC1 and BC2 of six bread wheat crosses were used in this study to determine quantitative genetic parameters for days to heading (DH), days to maturity (DM), grain filling period (GFP), grain filling rate (GFR), plant height (PH), number of spikes plant-1 (S/P), number of grains spike-1 (G/S), 100-grain weight(100-GW) and grain yield plant-1 (GY/P). The t-test of the differences between parents of each cross was highly significant in most cases in the six studied crosses. The genetic analysis showed that the genetic variance among F2 plants was genetically differed for all studied characters in the six wheat crosses. The results indicated the importance of both additive and epistasis gene effects in the inheritance of both DH and DM, while additive gene effect is important in inheritance of GFP, PH and 100-GW. Additive, dominance and epistasis gene effects are important in inheritance of GFR, S/P, and GY/P at most crosses. Estimate of heritability in broad sense (h2b.s) were high for all earliness traits and medium to high percentages for yield and yield component in most crosses. Heritability in narrow sense (h2n.s) had moderate to high estimates for earliness traits and GY/P in most crosses, however, it had low to moderate values for G/S and 100- GW at most cases. Genetic advance under selection (∆g%) was found to be low for DH, DM, GFP and PH at most cases. Meanwhile, it was medium to high for GFR, S/P and GY/P at most cases. No associated molecular marker with wheat earliness could be detected following application of 18 random primer (10 decamers and 8 15 mer ones) against all of the nine DNA templets isolated from the different early or late maturity genotypes. The second peroxidase isozyme exhibited high activity in early genotypes and lower activity in late ones with exception of late Bc2 the same trend was detected exactly with the second esterases isozymes. On the other hand no relationship was detected between the two cataase isozyme and wheat earliness. The early groups showed high intensities for the third protein band and low intensities in Line 3 (late)and the late groups, this protein band may be associated with earliness.
Publication year 2013
Organization Name
Country Egypt
Author(s) from ARC
External authors (outside ARC)
    Prof. Dr. M. A. Nassar جامعة الازهر
Agris Categories Agricultural research
Publication Type Master Thesis
↑