Mapping QTL for climbing ability and component traits in common bean (<Emphasis Type="Italic">Phaseolus vulgaris</Emphasis> L.) |
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Authors: | Oscar E Checa Matthew W Blair |
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Institution: | 1.Faculty of Agricultural Sciences,Universidad de Nari?o,Pasto,Colombia;2.Bean Project,Centro Internacional de Agricultura Tropical (CIAT),Cali,Colombia |
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Abstract: | Common bean (Phaseolus vulgaris L.) varies in growth habit from aggressive climbing types to bush beans. Growth habit is determined by a combination of factors
including determinate versus indeterminate growth, total plant height, degree of branching and internode length. Together
these factors make up climbing ability. The objective of this research was to determine the quantitative trait loci (QTL)
controlling climbing ability in a F5:8 recombinant inbred line population derived from an inter-gene pool cross of an aggressive indeterminate climbing bean with
type IV growth habit (G2333) by an indeterminate bush bean of type IIb growth habit (G19839). The population was planted in
four randomized complete block design experiments across environments that varied in altitude (from 1,000 to 1,750 masl) and
soil fertility (low versus high phosphorus). QTL were identified for plant height, internode length and number of branches
per plant on a genetic map covering all common bean linkage groups with a total length of 1,175 cM. In addition a scale was
developed to evaluate overall climbing ability and was also used to identify QTL. A total of 7 QTL were found for plant height,
9 for climbing ability, 6 for internode length and 1 for branch number. The largest number and most significant QTL were found
on the lower half of linkage group B04 suggesting a major pleiotropic locus for growth habit traits at this location of the
genome that is distinct from previously characterized genes which control plant morphology of the crop. |
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Keywords: | Growth habit Internode length Plant architecture and plant height |
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