Plant Genome II Conference
Town & Country Conference Center, San Diego, CA, January, 1994.
PG-II: MOLECULAR LINKAGE MAP ANALYSIS OF THE GENENCS OF DOMESTTCATION
IN COMMON-BEAN
MOLECULAR LINKAGE MAP ANALYSIS OF THE GENENCS OF DOMESTTCATION
IN COMMON-BEAN.
E.M.K. Koinange 1, S.P. Singh 2, P. Gepts 1, 1 Department of
Agronomy and Range Science, University of California, Davis, CA
95616-8515. Current address of EMKK is Ministry of Agriculture,
Lyamungu Research Institute, P.O. Box 3004, Moshi, Tanzania; 2
Bean Program, Centro Internacional de Agricultura Tropical,
Apartado Aereo 6713, Cali, Colombia.
The wild progenitor and cultivated descendant of crop
species show marked phenotypic differences for morphological and
physiological traits constituting the domestication syndrome.
These traits include growth habit, seed dispersal and dormancy,
and phenology. We developed an F8 recombinant inbred population
of n = 65 between the snap bean cultivar Midas and the wild bean
accession G12873. Using RFLP linkage mapping, we showed that the
genetic control of most traits of this syndrome in common-bean
(Phaseolus vulgaris L.) involves genes that have a major effect
and account for most of the variation observed (> 60%). The
exceptions were internode length and harvest index. Few genomic
regions were involved, one of which greatly affected growth habit
and phenology, two important traits in determining adaptation to
a cultivated environment. These results suggest domestication
may have proceeded rapidly and that adaptation to rapidly
changing environmental conditions may involve genes with major
phenotypic effect.
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