Plant Genome II Conference
Town & Country Conference Center, San Diego, CA, January, 1994.
PG-II: VARIATION FOR SEGREGATION AND LINKAGE IN CROSSES OF
COMMON-BEAN
VARIATION FOR SEGREGATION AND LINKAGE IN CROSSES OF
COMMON-BEAN.
O.M. Paredes 1 and P. Gepts, Department of Agronomy and Range
Science, University of California, Davis, CA 95616-8515, 1
Present address: Estacion Experimental Quilamapu, INIA, Casilla
426, Chillan Chile
Segregation for isozymes and RFLPs was investigated in F2
populations of common-bean. Segregation distortion for 7% of
RFLP loci was observed in both Andean x Andean and Andean x
Middle American crosses. For isozymes, segregation distortion
was observed for 33% of loci in Middle American x Andean crosses
and 0% in Andean x Andean crosses. Recombination was analyzed in
two linkage groups in 5 F2 populations resulting from Middle
American x Andean crosses. Considerable variation for
recombination values was obtained among crosses, part of which
appeared to be independent of environmental influences. The gene
order was generally conserved with the exception of some more
closely linked markers. The consequences of these findings for
common-bean genome mapping will be discussed.
Return to Previous Page or Intl-PAG Homepage