Genetic variability, genotypic and phenotypic correlations between economic traits of maize under different dates of planting [electronic resource].

By: Contributor(s): Language: English Summary language: Arabic Description: p.5973-5981Other title:
  • التباين الوراثى والأرتباط الوراثى والمظهرى بين الصفات الاقتصادية للذرة الشامية تحت مواعيد زراعة مختلفة.‪ [Added title page title]
Uniform titles:
  • Mansoura University journal of agricultural sciences, 2005 v. 30 (10) [electronic resource].
Subject(s): Online resources: In: Mansoura University Journal of Agricultural Sciences 2005.v.30(10)Summary: New early 27 yellow three-way crosses of maize were evaluated at two planting dates (early and late). Genotypic and phenotypic variation, correlation coefficients, heritability in the broad sense and heterosis were estimated for six economic traits. Mean squares due to planting dates were highly significant for all attributes except for number of rows/ear. The means were higher under the eariy planting date compared with the late planting date for all the traits. The genetic variance of genotypes was significant for all traits at each of the two planting dates and across planting dates. While, the interaction between genetic variance and planting dates was not significant for all the studied traits. Phenotypic and genotypic variances were increased under early planting date (non- stress environment) for silking date, ear length and ear diameter, while the phenotypic and genotypic variances were increased under late planting date (stress environment) for grain yield, number of rows/ear and number of kernels/row. Heritability was higher under non stress environment for silking date, grain yield and ear length, while it was higher under stress environment for ear diameter, number of rows/ear and number of kernels/row. The highestvalue of heritability was obtained for silking date (91.43%).
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New early 27 yellow three-way crosses of maize were evaluated at two planting dates (early and late). Genotypic and phenotypic variation, correlation coefficients, heritability in the broad sense and heterosis were estimated for six economic traits. Mean squares due to planting dates were highly significant for all attributes except for number of rows/ear. The means were higher under the eariy planting date compared with the late planting date for all the traits. The genetic variance of genotypes was significant for all traits at each of the two planting dates and across planting dates. While, the interaction between genetic variance and planting dates was not significant for all the studied traits. Phenotypic and genotypic variances were increased under early planting date (non- stress environment) for silking date, ear length and ear diameter, while the phenotypic and genotypic variances were increased under late planting date (stress environment) for grain yield, number of rows/ear and number of kernels/row. Heritability was higher under non stress environment for silking date, grain yield and ear length, while it was higher under stress environment for ear diameter, number of rows/ear and number of kernels/row. The highestvalue of heritability was obtained for silking date (91.43%).

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