Efficacy of qFL-chr1, a Quantitative Trait Locus for Fiber Length in Cotton (Gossypium spp.)
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abstract
In an earlier advanced-backcross quantitative trait locus (QTL) analysis of an inter specific Gos-sypium 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 BC3F2plants heterozygous for the genetic markers that delineate the qFL-chr1 QTL were selected to construct three independent populations of near-isogenic intro-gression 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. Crop Science Society of America.
