ESTIMATION OF EPISTASIS, ADDITIVE AND DOMINANCE VARIATION IN SOME BREAD WHEAT(Tritr’cum aestr‘vum, L)CROSSES | ||||
| Journal of Plant Production | ||||
| Article 5, Volume 30, Issue 6, June 2005, Page 2999-3011 PDF (583.08 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2005.237241 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| S. A. Abd EI-Majeed, | ||||
| National Wheat Research Program, Field Crops Research Institute, ARC. | ||||
| Abstract | ||||
| A, B and C scaling test as well as 6-parameters model were used in order to assess the nature of gene effects for seven traits in three crosses of bread wheat viz. plant height, number of days to heading. number of days to maturity, number of spikes/plant, number of kernels lspike, 1000 kernel weight and grain yield lplant in three bread wheat crosses (Tritlcum aestivum, L) Analysis of variance indicated significant differences existed among generations for all studied traits Non-allelic interactions were observed for all traits and crosses except in few cases in which the values did not reach the significant levels . In the 6—parameters model, the additive component (a) as well as dominance component (d) were significant In most cases. Additive X additive tea) was significant for all cases except for plant height in cross lll Additive X dominance (ad) component was significant for plant height in cross II and days to maturity and spikasfplant in cross 1. The dominance X dominance (dd) component was significant for all cases except for days to maturity in cross ll, and spikeslpiant in cross l and cross ill Significant values of heterosis based on mid- parent values were obtained Negative inbreeding depression was detected for some traits in some crosses whereas no inbreeding depression was observed for spikeslplant in cross I. High heritability values 1n broad sense were observed for all studied trails for all crosses. Narrow sense heritability ranged from 42.05 for kernelslspike to 74.30 for plant height in cross lll. Genetic advance values were higher for spikesipiant in all crosses whereas those values were found to be very low for days to maturity in all crosses under study | ||||
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