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Bullo Neda Tulu
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International Journal of Plant Breeding and Crop Science

Correlation and path coefficients analysis studies among yield and yield related traits of quality protein maize (QPM) inbred lines

Bullo Neda Tulu

Department of Plant Science (Plant Breeding and Genetics courses), College of Veterinary Medicine and Agriculture, Salale Campus Addis Ababa University, P.O. Box 245, Fiche, Ethiopia

Accepted 19 September, 2014.

Citation: Tulu BN (2014). Correlation and path coefficients analysis studies among yield and yield related traits of quality protein maize (QPM) inbred lines. International Journal of Plant Breeding and Crop Science, 1(2): 006-017.

Copyright: © 2014 Tulu BN. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited. 


The study was carried out to estimate correlation coefficients among grain yield and yield related traits and work out direct and indirect effects of yield-related traits on grain yield using path- coefficient analysis. Sixty-six F1 crosses and two standard checks were evaluated at Mechara, Ethiopia. The analysis of variance revealed that mean squares due to entries and crosses were highly significant (p<0.01) or significant (p<0.05) for most traits studied, indicating the existence of variability among the materials evaluated, which could be exploited for the improvement of respective traits. Grain yield showed positive and highly significant correlations with most traits at phenotypic and genotypic levels.  Ear diameter and number of kernels per row exerted positive direct effect and also had positive association with grain yield. These traits could be used as a reliable indicator in indirect selection for higher grain yield since their direct effect and association with grain yield were positive at phenotypic and genotypic levels. Traits having strong relationship with grain yield can be used for indirect selection to improve grain yield because grain yield can be simultaneously improved along with the traits for which it showed strong relationship.

Key Words: Correlation coefficients, path coefficients, quality protein maize