Estimation of genetic variability and correlation coefficients of different salinity levels in mungbean genotypes

Abstract

For this study eight mungbean genotypes viz., ADT 2, BM-2002-1, ML 5, AKM 4, Vishal, Vamban, TARM 1 and Utkarsh were used. Observation were taken on seven seedling characters and 7 quantitative characters. Statistical analysis of the seedling and quantitative characters showed that the PCV was higher than that of GCV for all the characters studied. Highest GCV and PCV were expressed by seedling shoot dry weight at 6 dSm-1 salinity level followed by seedling shoot fresh weight at 6 dSm-1, indicating that variation among the genotypes was highest for these traits. The PCV and GCV values were lowest in germination percentage followed by the shoot length at control. Among the growth characters heritability (broad sense) was found to range from 41.57 % to 100 % in control, while in salinity levels broad sense heritability ranged from 50 % to 100 %. Under control, heritability was high for all characters except for germination percentage, shoot length and plant height. While in salinity condition, it was high for all characters except for number of pods/plant at 6 dsm-1 salinity level. The genetic advance was high in nature only for the germination percentage whereas, the remaining character revealed low GA estimates. The maximum genetic advance in percent of mean (GAMP) was obtained for seedling shoot dry weight followed by seedling root dry weight at 6 dsm-1 and the lowest was for plant height followed by germination percentage at control. The study revealed that all the 14 characters were positively correlated with each other. For all the characters, the genotypic correlation was at higher level than the phenotypic correlation. Four elite genotypes were found to be superior based on the mean performance namely Utkarsh, TARM 1, Vamban and Vishal among the various levels of salinity.