Correlation and path coefficient analysis in five inbred line of maize (Zea mays L.) and their F 1 and F 2 hybrids under different conditions using line × tester analysis


Sherwan I. Tawfiq, Dana A. Abdulkhaleq, and Bestoon O. Hamma-Umin

Professor, Ph.D in Plant Breeding and Genetics, Field Crops Department, Faculty of Agricultural Sciences, University of Sulaimani, Iraqi Kurdistan
Lecturer, Ph.D in Plant Breeding and Genetics, Field Crops Department, Faculty of Agricultural Sciences, University of Sulaimani, Iraqi Kurdistan.
Assistant Lecturer, M.Sc. in Plant Breeding and Genetics, Field Crops Department, Faculty of Agricultural Sciences, University of Sulaimani, Iraqi Kurdistan


Abstract

This investigation was conducted on maize (Zea mays L.) at two environmentally
different locations in Sulaimani, viz. Kanipanka and Qlyasan. The objective was to
investigate the correlation between kernel yield and other agronomic characters and their
direct and indirect effects on yield through path coefficient analysis. For the first
generation at Kanipanka, correlation studies revealed significant positive relationship of
kernel yield with number of rows/ear, while at Qlyasan, kernel yield had significant
positive correlation with plant height number of kernels/row and kernel weight/row. For
the second generation kernel yield/plant had highly significant correlation with most of
the studied characters at both locations. For the first generation, the path analysis revealed
that, number of ear/plant and number of kernel/row recorded the maximum positive direct
effect in kernel yield/plant at Kanipanka and Qlyasan, while the maximum negative direct
effect in kernel yield exhibited by plant height and number of ear/plant at Kanipanka and
Qlyasan. The maximum positive indirect effect on kernel yield/plant recorded by number
of ear/plant via plant height and the maximum negative indirect effect recorded by plant
height via number of ear/plant at Kanipanka location, while at Qlyasan location number
of kernel/row gave the maximum positive indirect effect via kernel weight/row and the
maximum negative indirect effect recorded by number of ear/plant via kernel weight/row.
For the second generation, the maximum positive direct effect in kernel yield recorded
by number of ear/plant and plant height at Kanipanka and Qlyasan locations, while the
maximum negative direct effect recorded by 300-kernel weight at both locations. The
maximum positive indirect effect showed by number of ear/plant via number of rows/ear
at Kanipanka location. At Qlyasan, the maximum positive indirect recorded by plant
height via kernel weight/ear. The maximum negative indirect effect recorded by 300-
kernel weight via plant height at both locations. These results detected that number of
ear/plant, number of kernels/row and plant height may be used as reliable criteria for
improving kernel yield in maize.

Key Words:

Zea mays L.;
Correlation Analysis;
Path Coefficient
Analysis; Grain Yield

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