Journals / International Journal of Agriculture, Environment and Food Sciences / 2018 / Cilt: 2 - Sayı: 4
Correlation and path coefficient analysis for grain yield and its attributing traits of maize inbred lines (Zea mays L.) under heat stress condition
- Pages
- 124–130
- DOI
- —
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 springseason from February to June, 2016 at Rampur, Chitwan, Nepal. Meterological data showed maximum meanº ºtemperature (46.2–43.28C) and minimum (30.52-30.77C) in with relative humidity 37.05 to 49.45% inside the tunnelduring in April-May which coincided with the flowering, pollination and grain filling periods. The data were analyzedstatistically to study the correlation and path coefficient. The analysis of variance showed that all the lines weresignificantly different from each other for all traits anthesis silking interval, SPAD chlorophyll and leaf senescence, tassel-1 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 , number of kernel row, silk receptivity, shelling percentage, thousand kernel weight and grainyield. Grain yield had positive and significant phenotypic correlation with silk receptivity, shelling percentage, cob-1 -1 length and diameter, number of kernel ear , number of kernel row , number of kernel row, SPAD chlorophyll, thousandkernel weight and significant and negative correlation with tassel blast, anthesis silking interval, leaf area index, leaf-1 firing. Path analysis revealed that of thousand kernel weight, shelling percentage, number of kernel ear and silkreceptivity exerted maximum positive direct effect on grain yield. Therefore, selection of genotypes having maximum-1 thousand kernel weight, shelling percentage, silk receptivity and number of kernel ear and shorter anthesis silkinginterval, no leaf firing and tassel blast is pre-requisite for attaining improvement in grain yield under heat stress condition.