Musoni, Augustine and Kimani, Paul and Narla, R.D. and Buruchara, Robin
(2010)
Inheritance of fusarium wilts (Fusarium oxysporum F. sp. phaseoli) resistance in climbing beans.
African Journal of Agricultural Research , 5 (5).
pp. 399-404.
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Abstract
Fusarium wilt, caused by Fusarium oxysporum F. sp. phaseoli caused growers to abandon the most
popular climbing bean cultivar, Umubano (G2333) in Rwanda. The present objective was to determine the
nature of inheritance of fusarium wilt resistance and recommend a breeding strategy to introduce
resistance into susceptible cultivars. Two cultivars, vuninkingi (G685) and flora were donors of resistance
to fusarium wilt whereas G2333 was highly susceptible. Injured root tips of 10-day old seedlings of the
parents, progenies of F1 and F2 (G2333 × G685) and (G2333 × Flora), backcrosses F2 (G685 × Flora) were
inoculated with 106 conidia ml-1 of Rwandan isolate of F. oxysporum F. sp phaseoli (FOP-RW2) in a
glasshouse. The disease severity was rated 28 days later using the CIAT scale of 1 - 9, where 1 - 3
represent resistant, 4 - 6 tolerant and 7 - 9 susceptible reactions. The chi-square analysis was performed
to determine the Mendelian segregation ratios of resistant and susceptibility among the inoculated
progenies. The F1 and the backcross progenies to the resistant parents segregated in the ratio of 1:0 as
did the F2 population (G685 × Flora). The F2 progenies segregated in the ratio of 3:1. The backcross
progenies to the susceptible parent segregated in the ratio of 1:1. Resistance to fusarium wilt is
conditioned by a single highly heritable major dominant gene. The resistance can be achieved by
backcross breeding.
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