Marker assisted selection: Is it practical?
2000
Sorrells, M.E. (Cornell University, New York (USA). Department of Plant Breeding)
Molecular markers have been proposed for use in fingerprinting, parental selection, monitoring homozygosityoutcrossing, or genetic stocks, for selection of loci controlling traits that are difficult or costly to evaluate, or have low heritabilityand for selection against donor genome in backcrosses. The use of markers for these activities to date has been minimal, especially for crops such as wheat where the genetic system is complex. There are many potential problems. Some of the limitations include low polymorphism, complex inheritance, low precision in mapping, errors in assigning relative weights or in choosing loci, cost of developing and using molecular markers, undetected recombination between markers and trait loci, unknown linkage relationships between marker and trait alleles in genotypes other than parents of mapping populations, locus x year interaction, and negative pleiotropic effects. Because conventional breeding methods have been effective for improving quantitative traits, there is resistance to implementation of marker assisted selection due to labor and cost. Initiallymarker assisted selection (MAS) in backcross populations using elite recurrent parents is the most efficient method for testing the efficacy of MAS. For species with low polymorphism, the use of hypervariable markers such as microsatellites is critical.
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