Genetic Variability of Agronomic Traits as Potential Indicators of Drought Tolerance in Common Beans (Phaseolus vulgaris L.)
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Date
2019
Authors
Langat, Charles
Ombori, Omwoyo
Leley, Philip
Karanja, David
Cheruiyot, Richard
Gathaara, Moses
Masila, Benard
Journal Title
Journal ISSN
Volume Title
Publisher
hindawi
Abstract
Sixteen progeny lines of common beans obtained from single crosses made between two parents, GLP2 and KAT B1, were grown
in randomized complete block design in a rainout shelter at the Agricultural and Mechanization Research Institute, Machakos,
Kenya. 'e experiment was conducted to study inheritance of traits associated with drought stress adaptation and to establish if
significant variation for those traits was existing in order to carry out selection for drought tolerance. 'e calculated mean values
were used to estimate heritability, genetic advance, and correlation study for each trait. Water stress had a significant (p ≤ 0.01)
effect on the number of pods per plant, grains per plant, 100-seed weight, and yield per plant. 'e highest values for genotypic
coefficient of variation (36.11%) and phenotypic coefficient of variation (36.70%) were recorded for pods plant-1 under stress
condition. Highest broad-sense heritability estimates (96.54%, 94.97%, and 93.16%) coupled with high genetic advance as percent
of the mean (22.32%, 34.97%, and 26.32%) were obtained for the number of pods plant− 1, days to maturity, and yield plant− 1,
respectively, showing that selection of these traits together could lead to yield improvement under stressed conditions. Harvest
index showed a significant and positive relationship with biomass aboveground (r � 0.86) and the number of pods plant− 1
(r � 0.86) indicating the possibility of identifying high performing lines of common beans for drought stress environment for
further studies on these traits.
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Citation
Langat, C., Ombori, O., Leley, P., Karanja, D., Cheruiyot, R., Gathaara, M., & Masila, B. (2019). Genetic variability of agronomic traits as potential indicators of drought tolerance in common beans (Phaseolus vulgaris L.). International Journal of Agronomy, 2019.