Inheritance of resistance to Acanthoscelides obtectus in a wild common bean accession crossed to commercial bean cultivars

Vista sencilla de ítem
dc.creatorKornegay, Julia L.
dc.creatorCardona, C.
dc.date1991
dc.date2014-09-24T07:58:52Z
dc.date2014-09-24T07:58:52Z
dc.date.accessioned2026-06-27T14:43:26Z
dc.descriptionThe bean weevil Acanthoscelides obtectus, is an important storage pest of common beans in Latin America and Africa. A few wild bean accessions from Mexico have been identified as highly resistant to the weevil. One accession, G 12952, was crossed to two susceptible bean cultivars differing in seed size. Reciprocal F1 and F2 individual seed were evaluated for days to adult emergence (DAE) and emerged adult weight. Maternally inherited seed size affected resistance measurements only in the F1 reciprocal crosses, however, the overall resistance level of the F1 was more similar to that of the susceptible cultivars. The F2 showed a continuous, but skewed distribution from low to high DAE. Very few F2 individuals had the resistance level of G 12952. When the frequency distributions were divided into discrete categories based on parental response, resistance was found to be inherited as two recessive complementary genes. The F3 generation showed an overall lowering of resistance levels compared to their original F2 evaluations. However, none of the lines classified as resistant (?50 DAE) in the F2, fell into the susceptible category in the F3, indicating that the resistant genotypes were relatively stable as expected with recessively inherited traits. Modifying genes from the commercial parents may be responsible for general lowering of resistance. Seed size was negatively correlated with adult weight but not with DAE. The unique resistance of the wild bean accessions is discussed in relation to its inheritance. The results and obstacles encountered in the A. obtectus breeding program at CIAT are described.
dc.identifierhttps://hdl.handle.net/10568/42984
dc.identifier.urihttp://hdl.handle.net/123456789/86513
dc.languageen
dc.rightsLimited Access
dc.subjectphaseolus vulgaris
dc.subjectacanthoscelides obtectus
dc.subjectresistance
dc.subjectinheritance
dc.subjectcrossbreeding
dc.subjectwild beans
dc.subjectseed size
dc.subjectcoleoptera
dc.subjectinjurious insects
dc.subjectnoxious animals
dc.subjectpests
dc.subjectplant breeding
dc.subjectresistencia
dc.subjectherencia
dc.subjectcruzamiento
dc.subjectfrijol silvestre
dc.subjecttamano de la semilla
dc.titleInheritance of resistance to Acanthoscelides obtectus in a wild common bean accession crossed to commercial bean cultivars
dc.typeJournal Article

Archivos

Colecciones

Centro Internacional de Agricultura Tropical (CIAT)