Epistasis in cassava adapted to midaltitude valley environments

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dc.creatorPérez Velásquez, Juan Carlos
dc.creatorCeballos, H.
dc.creatorJaramillo, Gustavo
dc.creatorMorante, N
dc.creatorCalle, F.
dc.creatorArias, B.
dc.creatorBellotti, Anthony C.
dc.date2005-07
dc.date2014-09-24T08:42:06Z
dc.date2014-09-24T08:42:06Z
dc.date.accessioned2026-06-27T14:32:51Z
dc.descriptionLittle is known about the inheritance of agronomic traits in cassava (Manihot esculenta Crantz). The vegetative multiplication of cassava allows cloning of individual genotypes, and separates environmental from genetic variation in the within-family variation. Knowing the magnitude of between- and within-family variation is important for defining breeding strategies and for measuring different components of genetic variances, particularly the seldom-estimated epistasis. A group of nine genotypes, adapted to midaltitude environments, was used for a diallel study. Thirty clones were obtained from every F1 cross (each clone was represented by six plants), and planted in three replications at two locations. Statistical differences among crosses were found for fresh-root yield, harvest index, root dry-matter content, and reaction to mites (Mononychellus tanajoa Bondar) and to whiteflies (Aleurotrachelus socialis Bondar). General combining ability (GCA) was significant for all traits except fresh-root yield and dry-matter content, and specific combining ability (SCA) was significant for all traits except whitefly damage score. Fresh-root yield was the only trait with significant epistatic effects, which, combined with a large dominance variance, suggested a prevalence of nonadditive effects. The introduction of inbreeding would be one approach for the efficient exploitation of these nonadditive effects found for fresh-root yield. For the remaining traits, epistasis was negligible and current schemes exploiting additive effects may suffice.
dc.identifierhttps://hdl.handle.net/10568/43413
dc.identifier.urihttp://hdl.handle.net/123456789/81357
dc.languageen
dc.publisherWiley
dc.rightsLimited Access
dc.subjectmanihot esculenta
dc.subjectgenetic variation
dc.subjectdiallel crossing
dc.subjectgene interaction
dc.subjectaleurotrachelus socialis
dc.subjectmononychellus tanajoa
dc.subjectvariación genética
dc.subjectcruzamiento dialelo
dc.subjectinteracción de genes
dc.titleEpistasis in cassava adapted to midaltitude valley environments
dc.typeJournal Article

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Centro Internacional de Agricultura Tropical (CIAT)