Genetic variability, Interrelationship and Path-coefficient Analysis for Grain Yield and other Yield Attributes among Maize (Zea mays L.) Genotypes
Publication Date : 23/04/2022
Assessment of genetic variability and association existing between different agronomic traits determine the progress of selection in crop improvement program. The objective of this study is to estimate genetic variability, correlation and path analysis for grain and yield components of traits of maize genotypes. Fifteen maize genotypes arranged in randomize complete block design with three replicates were evaluated at two different sites (Gezira and White Nile) during one season, 2017/2018. Then studied the growth performance such as days to 50% tasseling and silking, plant height and ear height, and reproductive stage such as ear characteristics (length, size and hundred kernel weight) and grain yield. Amount of genetic variability was detected among the studied genotypes due to significant differences observed among the most of studied traits with the grain yield. The overall mean for grain yield was 1568 kg/ha in the first location and 4959.2kg\ha in the second location. Genotypes for grain yield ranged from1300kg\ha genotype 2011DTMA-WSTR to2035.5kg\ha genotype Hudiba-2.in the second location, on the other hand, it ranged from 4161.5kg/ha for genotype TZEE-WPOP STRXZ 104 to 5989.6kg/ha for genotype; 2008DTMA-WSTR. Association studies indicate that the traits like days to 50% tasseling and silking, ear length and hundred kernels weight were showed a significant positive association with grain yield. Out of ten traits taken for path analysis, plant height recorded a maximum direct effect with grain yield followed by ear diameter, number of kernels per rows and hundred kernel weight and they strongly contributed for higher grain yield and could be relied upon for selection of genotypes to improve genetic yield potential of maize. Direct selection of plant height, ear diameter and number of kernel per rows might be rewarding for yield improvement since they revealed true relationship with grain yield. The variability in maize genotypes scored high values of yield and other related traits could be used in any maize breeding program in Sudan in the future.
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