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Mapping quantitative trait loci in tetraploid populations

Published online by Cambridge University Press:  01 August 2000

CHONGQING XIE
Affiliation:
Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA
SHIZHONG XU
Affiliation:
Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA Current address: Dr Chongqing Xie, Pioneer Hi-Bred International Inc., 7300 N.W. 62nd Avenue, Johnston, IA 50131, USA.
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Abstract

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Knowledge of quantitative trait locus (QTL) mapping in polyploids is almost void, albeit many exquisite strategies of QTL mapping have been proposed and extensive investigations have been carried out in diploid animals and plants. In this paper we develop a simple algorithm which uses an iteratively reweighted least square method to map QTLs in tetraploid populations. The method uses information from all markers in a linkage group to infer the probability distribution of QTL genotype under the assumption of random chromosome segregation. Unlike QTL mapping in diploid species, here we estimate and test the compound ‘gametic effect’, which consists of the composite ‘genic effect’ of alleles and higher-order gene interactions. The validity and efficiency of the proposed method are investigated through simulation studies. Results show that the method can successfully locate QTLs and separates different sources (e.g. additive and dominance) of variance components contributed by the QTLs.

Type
Research Article
Copyright
© 2000 Cambridge University Press