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Marker assisted selection: is it practical?

By: Sorrells, M.E | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Kohli, M.M.|Francis, M [eds.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Montevideo (Uruguay) CIMMYT : 2000Description: 103-110.ISBN: 9974-7586-1-0.Subject(s): Genetic maps | Genetic markers AGROVOC | Genetic variation | Genotype environment interaction AGROVOC | Selection | CIMMYT | Triticum | Plant breeding AGROVOCDDC classification: 633.1153 Summary: Molecular markers have been proposed for use in fingerprinting, parental selection, monitoring homozygosity; outcrossing, or genetic stocks, for selection of loci controlling traits that are difficult or costly to evaluate, or have low heritability; and 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. Initially; marker 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.Collection: CIMMYT Publications Collection
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 633.1153 KOH (Browse shelf) 1 Available E649448
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Molecular markers have been proposed for use in fingerprinting, parental selection, monitoring homozygosity; outcrossing, or genetic stocks, for selection of loci controlling traits that are difficult or costly to evaluate, or have low heritability; and 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. Initially; marker 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.

English

0105|AL-Wheat Program|AGRIS 0102

Jose Juan Caballero

CIMMYT Publications Collection

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Centro Internacional de Mejoramiento de Maíz y Trigo (CIMMYT) © Copyright 2015. Carretera México-Veracruz. Km. 45, El Batán, Texcoco, México, C.P. 56237.
Si tiene cualquier pregunta, contáctenos a CIMMYT-Knowledge-Center@cgiar.org