Estimation of Potence Ratio and Path Analysis Coefficient in Single Crosses of Maize (Zea Mays L.)

(Reem Ahmad Al-Hadi and Maha Lutfi Hadid and Samir Ali Al-Ahmad)

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Abstract

The present study was undertaken to study potence ratio and path analysis coefficient for 50% silking date, plant and ear height, ear length, ear diameter, number of rows per ear, number of kernels per row, 100 kernels weight, and grain yield per plant. Twenty8211; eight hybrids were produced through a half diallel crossing system using 8 inbred lines of yellow corn in 2008 season then evaluated during 2009 season. The results indicated that: 1. The best hybrids were (IL.275-06 215; IL.362-06), (IL.363-06 215; IL.275-06), (IL. 375-06 215; IL.362-06), (IL. 375-06 215; IL.275-06), (IL.459-06215; IL.275-06), (IL.459-06 215; IL.362-06 (for yield per plant. 2. Results of potence ratio indicated that inheritance of 50% silking date, plant and ear height, number of kernels per row, 100 kernels weight and grain yield per plant were controlled by over dominance while, inheritance of ear diameter was controlled by partial dominance. 3. Correlation coefficients among traits indicated positive and significant association between grain yield per plant with plant, ear height, ear length, ear diameter, number of kernels per row and 100 kernels weight. On the other hand, path analysis indicated that ear length, diameter, number of kernels per row, and ear height had high positive direct effects on grain yield variability. Key Words: Maize, Path analysis coefficient, Phenotypic correlation, Potence ratiod.
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