Estimation of some genetic parameters and heterosis using half diallelcrossing between five early maturity inbred lines of maize

	Estimation of some genetic parameters and heterosis using half diallelcrossing between five early maturity inbred lines of maize
Journal of Tikrit University For Agriculture Sciences
Article 1, Volume 11, Issue 1, 2011, Pages 86-97
Abstract
The study was carried out during the spring season at the farm of the college of Agriculture – Duhok university by using inbred line locally development (IK8, IK58, un44652, ZP-301 and un-44052. Half diallel cross program was applied for five inbred line to produce ten single crosses. Yield trail for the hybrid and parents were applied in research farm of college of agriculture Salahdidin university using a randomized complete block design with three replication in order to study the gene action for yield and yield components besides estimated heterosis, combining ability and phenotypic variance (additive, dominance and environmental variance.) in addition to estimating some genetic parameters. The results showed the presence of significant differences among genotypes for all characters. The best parent is (ZP-301) and also the best hybrid is (IK8×IK58) in yield and number of grain/ ear. The parent (IK8) appeared the to be the better general combining ability for the most characters while the hybrid (IK8×IK58) appeared to be the high specific combining ability for the yield/ plant, ear height, plant height and leaf area. The genetic variance more one and more than the additive variance for all characters this mean that characters under the effects of non-additive gene effect. The broad sense heritability were high value for all characters except the number of seed/ ear, while the narrow sense heritability were moderate for yield/ plant, 100 grain weight, ear length, number of grains/ ear and the number of days to 50% tasseling and low for the rest traits. The heterosis value was high for number of grains/ ear (63.33) and yield/ plant (19.33 ) for the hybrid (IK8×IK58) and high value for leaf area for hybrid (IK8×un44652), (Zp301×IK8) and (IK8×UN44052)

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