Comparison of selection strategies for marker-assisted backcrossing of a gene

Frisch, M. and Bohn, M. and Melchinger, A.E. (1999) Comparison of selection strategies for marker-assisted backcrossing of a gene. Crop Science, 39 (5). pp. 1295-1301.

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Marker-assisted selection can accelerate recovery of the recurrent parent genome (RPG) in backcross breeding. In this study, computer simulations were used to compare selection strategies with regard to (i) the proportion of the RPG recovered and (ii) the number of marker data points (MDP) required in a backcross programme designed for introgression of one target allele from a donor line into a recipient line. Simulations were performed using a published maize (Zea mays) genetic map consisting of 80 markers. Selection for the target allele was based on phenotypic evaluation. In comparison with a constant population size across all generations, increasing population sizes from generation BC1 to BC3 reduced the number of required MDP by as much as 50% without affecting the proportion of the RPG. A four-stage selection approach, emphasizing in the first generations selection for recombinants on the carrier chromosome of the target allele, reduced the required number of MDP by as much as 75% in comparison to a selection index taking into account all markers across the genome. Adopting the above principles for the design of marker-assisted backcross programmes resulted in substantial savings in the number of MDP required.

Item Type: Article
Author Affiliation: Institute of Plant Breeding, Seed Science, and Population Genetics, University of Hohenheim, 70593 Stuttgart, Germany.
Subjects: Crop Improvement > Genetics/Genomics
Crop Improvement > Plant Breeding
Divisions: General
Depositing User: Syamala
Date Deposited: 03 Nov 2010 20:43
Last Modified: 29 Dec 2010 20:51

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