Inheritance of angular leaf spot [Phaeoisariopsis griseola (Sacc.) Ferr] resistance in common bean (Phaseolus vulgaris L.) population developed from Kablanketi x Mexico 54
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Date
2012-07-20
Journal Title
Journal ISSN
Volume Title
Publisher
David Publishing
Abstract
The genetic resistance to angular leaf spot (ALS) caused by Phaeoisariopsis griseola in the common bean cultivar Mexico
54 was investigated on disease reactions in parental, F1, F2 and backcross generations derived from crosses between a resistant
cultivar Mexico 54 and a susceptible cultivar Kablanketi under screen house conditions. The heritability (h2
) estimate was as high as
0.719 indicating a successful transfer of ALS resistance among progenies and thus selection can be performed in early generation.
High heritability coupled with high expected genetic advance of 39.5% is considered to be more useful in predicting the outcome of
selecting the best individuals. Chi-square values were computed to determine whether the observed ratios for disease reactions
deviated from expected Mendelian ratios for a single, dominant gene controlling resistance to angular leaf spot in common bean.
Based on the resistance of the F2, and the backcross generation to the resistant parent, a 3 resistant: 1 susceptible segregation ratio in
the F2 and a 1 resistant: 1 susceptible segregation ratio in the backcross generation to the susceptible parent was obtained implying
that resistance to the isolate of Phaeoisariopsis griseola is governed by a single, dominant gene.
Description
Journal article
Keywords
Phaeoisariopsis griseola, Heritability, Genetic advance, Inheritance, Common bean