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Crop Science Abstract - Crop Breeding & Genetics

Efficacy of qFL-chr1, a Quantitative Trait Locus for Fiber Length in Cotton (Gossypium spp.)

 

This article in CS

  1. Vol. 51 No. 5, p. 2005-2010
     

    * Corresponding author(s): pwchee@uga.edu
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doi:10.2135/cropsci2010.11.0653
  1. Xinlian Shenab,
  2. Zhibin Caob,
  3. Rippy Singha,
  4. Edward L. Lubbersa,
  5. Peng Xub,
  6. C. Wayne Smithc,
  7. Andrew H. Patersond and
  8. Peng W. Chee *a
  1. a Molecular Cotton Breeding Lab., Univ. of Georgia, Tifton, GA 31793
    b Institute of Agro-biotechnology, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
    c Dep. Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77843
    d Plant Genome Mapping Lab., Univ. of Georgia, Athens, GA 30602. The University of Georgia and Jiansu Academy of Agricultural Sciences contributed equally to this work

Abstract

In an earlier advanced-backcross quantitative trait locus (QTL) analysis of an interspecific Gossypium hirsutum L. × Gossypium barbadense L. population, 28 fiber length QTLs were identified including qFL-chr1 on chromosome 1 of the A-subgenome. The G. barbadense allele at this QTL contributed to longer fibers and explained up to 24% of the phenotypic variance. To substantiate the association of this genomic region with fiber length, three BC3F2 plants heterozygous for the genetic markers that delineate the qFL-chr1 QTL were selected to construct three independent populations of near-isogenic introgression lines (NIILs). The efficacy of qFL-chr1 was evaluated among 140 NIILs grown in 2 yr. The results support the positive effect of qFL-chr1 on fiber length. A single NIIL, R01-40-08, had about 94.3% of recurrent genome composition and significantly longer fiber than the recurrent parent when grown in Nanjing, China. Therefore, in addition to confirming the efficacy of qFL-chr1 to enhance fiber length, this work provides a valuable genetic resource for the improvement of cotton.

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