Submit Manuscript

Asian Journal of Crop Science

Year: 2013 | Volume: 5 | Issue: 1 | Page No.: 1-13
Facebook Twitter Digg Reddit Linkedin StumbleUpon E-mail

Article Trend

Total views 280

Authors

M.El.M. El-Badawy

Keywords

Research Article

Heterosis and Combining Ability in Maize using Diallel Crosses among Seven New Inbred Lines

M.El.M. El-Badawy
A half diallel cross between 7 inbred lines of maize was evaluated under two different nitrogen rates for six quantitative characters. Nitrogen rates, genotypes, parents, hybrids and parents vs crosses mean squares were significant for all traits. Significant genotypexnitrogen rate mean squares were obtained for days to 50% maturity, No. of rows ear-1 and shelling%. Significant interaction mean squares between hybridsxnitrogen rates were detected for days to 50% maturity, No. of rows ear-1 and grain yield plant-1. General and Specific Combing Ability (GCA and SCA) mean squares were significant for all traits. GCA/SCA ratios revealed that the additive and additivexadditive types of gene action were the most important expressions for days to 50% maturity, number of rows ear-1 and shelling% in both and nitrogen rates and combined analysis. Significant interaction mean squares between nitrogen rates and GCA and SCA were detected for most traits. The crosses P1xP2 and P1xP7 at the low nitrogen level, P1xP4, P1xP6, P1xP7 and P2xP5 hybrids at the normal nitrogen level and the hybrid P1xP7 in the across nitrogen levels, were out yielded the check hybrid (Pioneer 30K8). Also, single cross P1xP7 did not differ significantly from the hybrid Hytech 2031 in low nitrogen rate and combined analysis for grain yield plant-1. The parental inbred line No. 4 gave a good combiner for No. of rows ear-1 and grain yield plant-1 at both and across nitrogen rate. The most desirable inter and intra allelic interactions were presented by combinations: P1xP6, P1xP7, P2xP6 and P5xP6 for 100-kernel weight, P1xP2, P1xP4, P1xP6, P1xP7, P2xP3, P2xP5, P2xP7 and P4xP7 for grain yield plant-1 and P1xP4 and P4xP7 for shelling%. These crosses may be prime importance in breeding programs either towards hybrid maize production or synthetic varieties composed of hybrids which involved the good combiners for the traits in view.
PDF Fulltext XML References Citation

Related Articles

Diallel Analysis of Some Yellow Maize Inbred Lines under Low and Normal Nitrogen Levels
Evaluation of Combining Ability and Heterosis for Yield and its Components Traits of Five Maize Inbreds under Normal and Stress Nitrogen Fertilization
Relative Values of Three Different Testers in Evaluating Combining Ability of New Maize Inbred Lines
Genotypic Correlation and Path Coefficient for Some Agronomic Traits of Hybrid and Inbred Rice (Oryza sativa L.) Cultivars
Response of Maize (Zea mays L.) Fodder to Different Levels of Nitrogen and Phosphorus
The Effect of Nitrogen and Phosphorus Fertilization on Growth, Yield and Quality of Forage Maize (Zea mays L.)
Genetic Control of Flowering Traits, Yield and its Components in Maize (Zea mays L.) at Different Sowing Dates
Genetic Parameters and Path Analysis of Yield and its Components in Corn Inbred Lines (Zea mays L.) at Different Sowing Dates
Yielding Ability and Nitrogen Use Efficiency in Maize Inbred Lines and Their Crosses

Leave a Comment

Your email address will not be published. Required fields are marked *