Variability of common bean (Phaseolus vulgaris L.) in Tanzania as evidenced by morphological assessment
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Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
Greener Journal of Agricultural Sciences
Abstract
A total of 84 common bean (Phaseolus vulgaris L.) accessions were collected
from different areas of Tanzania serving as source of germplasm. Nineteen agromorphological
traits of 84 common bean accessions were assessed to analyze
the variability as a core objective for this study. Among all the accessions,
40.48% were characterized by indeterminate bush with moderate climbing ability
and pods distributed evenly up to the plant habitus followed by 36.9%. Similarly,
14.29% were the genotypes with indeterminate bush with semi-climbing main
stem and branches habitus genotypes. Also, 14.29% were the genotypes with
the indeterminate bush with prostrate, and 7.14% were the genotypes with
indeterminate bush with erect branches habitus while 1.19% were the genotypes
with determinate bush least. Phonological, quantitative and qualitative traits
were evaluated and their scores were subjected to principal component analysis
and cluster analysis. The phylogenetic tree demonstrated 2 major clusters
which were further divided into sub-clusters. Principal component analysis
accounted for the accumulative variance of 35.78% revealing morphological
variation highly attributed with variables which had greater than 0.2 Eigen
values. The study demonstrated low morphological variation among the
genotypes and emphasized the need to broaden genetic variability of the
common bean in Tanzania. The results of this study can be used to select the
valuable breeding material for use. Besides, molecular markers can be deployed
to assess further the variability and diversity of these genotypes.
Description
Research article
Keywords
Common bean, qualitative traits, quantitative traits, cluster analysis, landraces