Correlation and path coefficient analysis for grain yield and its attributing traits of maize inbred lines (Zea mays L.) under heat stress condition

Year 2018, , 124 - 130, 20.12.2018

Manoj Kandel , Surya Kant Ghimire Bishnu Raj Ojha Jiban Shrestha

https://doi.org/10.31015/jaefs.18021

Cited By: 3

Abstract

Heat stress during the flowering,
pollination and grain filling periods affect maize grain yield and its
attributing  traits. Twenty maize inbred
lines were evaluated in alpha lattice design with two replications under heat condition
during spring season from February to June, 2016 at Rampur, Chitwan, Nepal. Meterological data showed maximum mean temperature (46.2–43.28^ºC) and minimum
(30.52-30.77^ºC) in with relative humidity 37.05 to 49.45% inside the
tunnel during in April-May which coincided with the flowering, pollination and
grain filling periods. The data were
analyzed statistically to study the correlation and path coefficient. The
analysis of variance showed that all the lines were significantly
different from each other for all traits anthesis silking interval, SPAD chlorophyll and leaf senescence, tassel blast, leaf
firing, plant and ear height, leaf area index, ear per plant, cob length and
diameter, number of kernel ear^-1, number of
kernel row^-1, number of kernel row, silk receptivity, shelling percentage, thousand
kernel weight and grain yield. Grain yield had positive and significant
phenotypic correlation with silk receptivity, shelling percentage, cob length
and diameter, number of kernel ear^-1, number
of kernel row^-1, number of kernel row, SPAD chlorophyll, thousand
kernel weight and significant and negative correlation with tassel blast,
anthesis silking interval, leaf area index, leaf firing. Path analysis revealed
that of thousand kernel weight, shelling percentage, number of kernel ear^-1
and silk receptivity exerted maximum positive direct effect on grain yield.
Therefore, selection of genotypes having maximum thousand kernel weight,
shellingpercentage, silk receptivity and number of kernel ear^-1 and
shorter anthesis silking interval, no leaf firing and tassel blast is
pre-requisite for attaining improvement in grain yield under heat stress
condition.

Keywords

Maize (Zea mays L.), Heat stress, Correlation, Path analysis, Coefficient

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