Estimation of some genetic features of maize strains (ZeamaysL.) and the hybrids obtained from them under water stress

	Estimation of some genetic features of maize strains (ZeamaysL.) and the hybrids obtained from them under water stress
journal of kerbala university
Article 1, Volume 11, Issue 0, 2015, Pages 48-59 PDF (0 K)
Abstract
A field experiment was conducted in Agronomy Research Station Abu-Ghuraib in three seasons ( fall of 2012 and 2013 and spring of 2014 ) to assess the performance of six pure lines of maize (Dr-c-87 , AST-217, Dr-B-32, Zm-189, Pio-24 and MGW-12 ) and to obtain individual hybrids under 2 irrigation system ( irrigation at 5 days interval and irrigation at 13 days interval ) , as well as the estimation of hybrid vigor and its General Combining Ability and Specific Combining Ability with some genetic features . The pure lines mentioned above were crossed at fall of 2012 and cross hybridization processes were done in one direction . Comparisons of hybrids and their parents were conducted in fall season of 2013 and spring of 2014 , following Randomized complete blocksdesignwith 3 replicates . Results show the followings : Statistical genetic analysis show that there were a significant differences among the different genotypes ( lines and their cross hybrids ) in all qualities studied. This analysis also show that mean squares of General Combining Ability and Specific Combining Ability of the hybrids were highly significant in most of the traits for the two seasons except ear number / plant in the 2nd irrigation interval . The effects of General Combining Abilityfor all the characters studied were significant , particularly the line (6) which had a high combining ability and in the desirable direction for most of the qualities . On the other hand , The effects of Specific Combining Abilityfor the crosses were significant for the most of the traits . The hybrid (2×5) however , gave the highest of this ability for most of the traits and the dominance degree reached above (1) in all the traits . The heritability percent for the broad sense was high in all the traits and low in the narrow sense for most the traits and both the irrigation intervals . The above results indicate that the hybridization protocol is the most suitable in improving the traits .

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