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Asian Journal of Crop Science

Year: 2011 | Volume: 3 | Issue: 3 | Page No.: 106-117
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Authors

Manal Hefny

Keywords

Research Article

Genetic Parameters and Path Analysis of Yield and its Components in Corn Inbred Lines (Zea mays L.) at Different Sowing Dates

Manal Hefny
The present investigation was carried out to estimate the genetic parameters and path analysis of plant characters measured on 13 inbred lines of corn and evaluated at two sowing dates during the 2009 growing season. The experiment was arranged in split-plot design with three replications. The main plots were two sowing dates (June 1st and July 1st) and subplots were thirteen inbred lines of corn. Results showed that, under optimal sowing, ear diameter, ear weight plant-1, number of rows ear-1 and number of grains row-1 exhibited positive and significant correlations at genotypic and phenotypic levels with yield plant-1. Days to 50% tasseling and silking associated negatively with ear diameter, grains row-1, 100 grain weight and grain yield. Under late sowing conditions, positive and significant genotypic correlations existed between grain yield plant-1 against days to 50% tasseling, days to 50% silking, ear length, ear weight plant-1 and number of rows ear-1. At optimal sowing, ear weight plant-1 had the highest positive direct influence (0.996) on grain yield followed by days to 50% tasseling (0.158) and 100-grain weight (0.126). On the other hand, ear diameter and days to 50% silking exerted high negative direct effect (-0.258 and -0.136, respectively). At late planting, ear weight plant-1 (1.093) and ear diameter (0.274) recorded the highest positive direct effect on grain yield. A moderate and positive influence of flowering traits was observed. Grains number row-1 (-0.092) recorded negative direct effect on yield and recorded positive and indirect effects through ear weight plant-1, ear diameter and 100-grain weight, respectively. It can be concluded that, ear weight plant-1 (at both planting dates), ear length, days to 50% silking and ear diameter as a primary; 100 grain weight and kernels row-1 as a secondary could be used as the main criteria for yield improvement when selecting in the studied materials.
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