Plant Genome I Conference
Town & Country Conference Center, San Diego, CA, November, 1992.
PG-I: 92pg1
EFFICIENCY OF GMAPB (Genome Map Assisted Plant Breeding)
Ben Hui Liu and Patrick Hayes Department of Crop and Soil
Science Oregon State University, Corvallis, OR 97331
Molecular marker-based linkage maps have been developed, or
are under onstruction, for most plant species. The impetus for
much of this work has been to increase the efficiency of applied
plant breeding. We have simulated marker-assisted selection
(MAS) in a self-pollinated doubled haploid population (barley)
and an outcrossing haploid population (loblolly pine). Factorial
combinations of the following were simulated for 500
replications: average linkage map densities (5%, 10%, and 20%
recombination frequency between adjacent markers); number of
known QTLs (quantitative trait loci) 1, 2, 4, and 6; average QTL
additive effects in terms of number of standard deviations (0. 1,
0.3, 0.5, 1.0, 2.0, and 4.0); number of progenies (50, 100, 500,
1000, and 5000); selection intensities of 1%, 5%, 10%, 20%, and
40%; and selection schemes (individual selection, full-sib
selection, and half-sib selection). Marker-assisted selection
(MAS) is at least as efficient as conventional selection (CS).
In most cases MAS is twice as efficient as CS and it can be up to
thirty times as efficient in certain cases. Given the potential
for rapidly genotyping large populations MAS should increase
selection efficiency and reduce cycle time. The role of parent
selection and maintenance of genetic variation in GMAPB is
discussed. A computer software for GMAPB is roposed. GMAPB is
demonstrated using data from the North American arley Genome
Mapping Project.
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