J Integr Plant Biol. ›› 2012, Vol. 54 ›› Issue (4): 228-237.DOI: 10.1111/j.1744-7909.2012.01108.x

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A Sequential Quantitative Trait Locus Fine-Mapping Strategy Using Recombinant-Derived Progeny

Qin Yang, Dongfeng Zhang and Mingliang Xu*   

  1. National Maize Improvement Center of China, China Agricultural University, 2 West Yuanmingyuan Road, Beijing 100193, China
  • Received:2011-12-14 Accepted:2012-02-08 Published:2012-04-01
  • About author:These two authors contributed equally to this article
    *Corresponding author Tel: +86 10 6273 3166; Fax: +86 10 6273 3808; E-mail: mxu@cau.edu.cn

Abstract:

A thorough understanding of the quantitative trait loci (QTLs) that underlie agronomically important traits in crops would greatly increase agricultural productivity. Although advances have been made in QTL cloning, the majority of QTLs remain unknown because of their low heritability and minor contributions to phenotypic performance. Here we summarize the key advantages and disadvantages of current QTL fine-mapping methodologies, and then introduce a sequential QTL fine-mapping strategy based on both genotypes and phenotypes of progeny derived from recombinants. With this mapping strategy, experimental errors could be dramatically diminished so as to reveal the authentic genetic effect of target QTLs. The number of progeny required to detect QTLs at various R2 values was calculated, and the backcross generation suitable to start QTL fine-mapping was also estimated. This mapping strategy has proved to be very powerful in narrowing down QTL regions, particularly minor-effect QTLs, as revealed by fine-mapping of various resistance QTLs in maize. Application of this sequential QTL mapping strategy should accelerate cloning of agronomically important QTLs, which is currently a substantial challenge in crops.

Yang Q, Zhang D, Xu M (2012) A sequential QTL fine-mapping strategy using recombinant-derived progeny. J. Integr. Plant Biol. 54(4), 228–237.

Key words: Fine-mapping strategy, progeny, quantitative trait locus, recombinant

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