GENETIC ANALYSIS OF SOME DROUGHT AND YIELD RELATED CHARACTERS IN SPRING WHEAT VARIETIES [Triticum aestivum L.] | ||
| Journal of Plant Production | ||
| Article 3, Volume 29, Issue 7, July 2004, Pages 3719-3729 PDF (2.94 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2004.238675 | ||
| Author | ||
| H. S. EI-Borhamy, | ||
| Wheat Res. Sec., Field Crop Res. Instit., Agric. Res. Center, Giza, Egypt. | ||
| Abstract | ||
| Six genotypes of wheat [Triticum aestivum I.] representing different agronomic characters crossed in all possible combination, excluding reciprocals, in 2000/2001 season. The six parents and their 15 F1 hybrids were evaluated during 2001/2002 growing season in the experimental from at Sakha Agric-Res. Stn, Kafer EI-Sheikh Governorate. The studied traits were days to heading, days to maturity, plant height, no. of spikes/plant, kernel weighVspike, no. of grains/spike, grain yield/plant, leaf temperature, stomatal resistant and transpiration rate. The analysis of variance revealed highly significant differences among genotypes for all studied traits except no. of spikes/plant under stress environment. G.C.A and S.C.A mean squares were highly significant for all studied traits and the magnitude of G.C .. A was greater than S.C.A mean squares, suggesting that additive genetic effects were predominant and played a major role in the inheritance of all traits. The genetic components Le. additive and dominance were highly significant under stress environment for all traits. • Significant dominance type of gene action was detected for all studied characters, except for heading date and maturity date, the dominance component was larger in magnitude than the additive one and the average degree of dominance in these character revealed the existence of over dominance. The value (H2/4 H1) was approximately equal to its maximum value for heading date, maturity date and number of spikes/plant, whereas , it was deviated from 0.25 for other traits .Heritability estimates in broad sense were high. however high to moderate heritability values (in narrow sense) were detected for heading date, indicating that most of genetic variance might be due to additive genetic effects .. The genetic variance might be due to additive types of gene action, so selection could be useful in this respect. Narrow sense heritability values were low for all traits indicating that most of genetic variance might be due to non-additive genetic effects. | ||
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