Genetic variability in flooding tolerance of mungbean (Vigna radiata L. Wilczek) genotypes |
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Authors: | M Rafiqul Islam Abdul Hamid Qazi Abdul Khaliq Jalal Uddin Ahmed M Moynul Haque M Abdul Karim |
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Institution: | (1) Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, 1706, Bangladesh;(2) Department of Crop Botany, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, 1706, Bangladesh |
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Abstract: | The study was an exploratory in nature conducted using a large number of mungbean (Vigna radiata L. Wilczek) genotypes of diverse growth habit and adaptive characters. Soil flooding induced changes in eleven morpho-physiological
characters of one-week old seedlings of 530 mungbean genotypes was compared in the study. The first and second principal components
(PC) of principal component analysis (PCA) results accounted for 58 and 14%, respectively of the total variations of mungbean
genotypes. The variation for first PC was composed mainly of relative dry weight (DW) of shoot and leaf as well as total DW.
The second PC distinguished the genotypes that produced larger root system. There were seven clusters distinguished in the
cluster analysis. The genotypes in cluster 4 and 6 performed better in respect of relative total DW and relative root DW,
respectively and hence having flooding tolerance. The genotypes in clusters 7 and 1 performed very poorly and those of under
clusters 3, 2 and 5 were moderate to poor. D2 analysis indicated that the clusters differed significantly from each other. Discriminant function analysis (DFA) reaffirmed
that more than 90% of the genotypes were correctly assigned to clusters. Both PCA and DFA confirmed that the relative total
DW followed by shoot and leaf DW as well as leaf area were the major discriminatory variables and the root : shoot ratio and
root DW were the secondary important variables to distinguish genotypes into groups. In this study, multivariate analyses
were used in identifying the mungbean genotypes of desirable traits for flooding tolerance. |
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Keywords: | Genotypes Variability Flooding tolerance Mungbean |
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