Inheritance of resistance to common bacterial blight in four selected common bean (Phaseolus vulgaris L.) genotypes
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Date
2017
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Plant Breeding and Crop Science
Abstract
Common bacterial blight (CBB) is the most serious bacterial disease of common bean in Uganda. It
causes severe yield losses of up to 62%. Genetic resistance is the most effective option for controlling
CBB in smallholder common bean production systems. This study was carried out to determine the
inheritance pattern of CBB resistance in leaf and pod of four new resistance sources. The four resistant
and four susceptible genotypes were crossed in a half-diallel mating design. F1 individuals were
advanced to F2 and evaluated with the parents, in a randomized complete block design replicated twice.
Combining ability analysis was performed according to Griffing's (1956) method IV and model 1 using
Genstat 12th. General combining ability effects were significant whereas specific combining ability was
not suggesting that resistance to CBB in leaf and pod was primarily controlled by additive genes
effects. The estimated narrow sense coefficient of genetic determination was moderately high (0.65) for
the resistance in leaf and high (0.83) for resistance in pod suggesting that early-generation selection
would be effective. Baker’s ratio estimates were relatively high for resistance in leaf (0.79) and pod (0.9)
suggesting that hybrids’ performance can be predicted based on the parents’ general combining ability
(GCA) effects.
Description
Keywords
Xanthomonas axonopodis pv, Phaseoli, General combining ability, Additive gene effects, Coefficient of genetic determination
Citation
Alladassi, B. M., Nkalubo, S. T., Mukankusi, C., Mwale, E. S., Gibson, P., Edema, R., ... & Rubaihayo, P. R. (2017). Inheritance of resistance to common bacterial blight in four selected common bean (Phaseolus vulgaris L.) genotypes. Journal of Plant Breeding and Crop Science. DOI: 10.5897/JPBCS2017.0644