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Mapping Quantitative Trait Loci Associated with Leaf and Stem Pubescence in Cotton

Mapping Quantitative Trait Loci Associated with Leaf and Stem Pubescence in Cotton Leaf pubescence in cotton have a potential for insect pest management. Varying degrees of leaf trichome density in Gossypium species and cultivars have been associated to a series of five genes, referred to as t 1 – t 5 . We used two segregating interspecific G. hirsutum × G. barbadense backcross populations developed in our laboratory to assess qualitatively and quantitatively leaf and stem pubescence. QTL analyses were performed using simple and composite interval mapping. Based on both types of measurements and under both types of QTL analyses, nine QTLs met permutation-based thresholds. The nine QTLs mapped to four different chromosome regions. Highest LOD values corresponded to the QTLs detected on c6 (four colocalized QTLs) and on D03 (two QTLs) for which the higher pubescence in the progeny derived from the pubescent G. hirsutum parent alleles. Conversely, on c17 (one QTL) and A01 (two QTLs), the G. hirsutum parental alleles affected negatively pubescence. These results combined with another published study confirm (1) the location in a center region of chromosome 6 of the t 1 locus as a major locus/gene determining leaf pubescence, and (2) additional genes located on seven additional chromosomes have been shown to impart trichome density either positively or negatively. The existence of a high density of PCR-based loci in most of the regions identified as harboring leaf pubescence QTLs, particularly that on chromosome 6, will facilitate future efforts for map-based cloning. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Heredity Oxford University Press

Mapping Quantitative Trait Loci Associated with Leaf and Stem Pubescence in Cotton

Lacape, J.-M.; Nguyen, T. B.
Journal of Heredity , Volume 96 (4) – Jul 1, 2005
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References (20)

Publisher
Oxford University Press
Copyright
Copyright 2005
ISSN
0022-1503
eISSN
1465-7333
DOI
10.1093/jhered/esi052
pmid
15829730
Publisher site
See Article on Publisher Site

Abstract

Leaf pubescence in cotton have a potential for insect pest management. Varying degrees of leaf trichome density in Gossypium species and cultivars have been associated to a series of five genes, referred to as t 1 – t 5 . We used two segregating interspecific G. hirsutum × G. barbadense backcross populations developed in our laboratory to assess qualitatively and quantitatively leaf and stem pubescence. QTL analyses were performed using simple and composite interval mapping. Based on both types of measurements and under both types of QTL analyses, nine QTLs met permutation-based thresholds. The nine QTLs mapped to four different chromosome regions. Highest LOD values corresponded to the QTLs detected on c6 (four colocalized QTLs) and on D03 (two QTLs) for which the higher pubescence in the progeny derived from the pubescent G. hirsutum parent alleles. Conversely, on c17 (one QTL) and A01 (two QTLs), the G. hirsutum parental alleles affected negatively pubescence. These results combined with another published study confirm (1) the location in a center region of chromosome 6 of the t 1 locus as a major locus/gene determining leaf pubescence, and (2) additional genes located on seven additional chromosomes have been shown to impart trichome density either positively or negatively. The existence of a high density of PCR-based loci in most of the regions identified as harboring leaf pubescence QTLs, particularly that on chromosome 6, will facilitate future efforts for map-based cloning.

Journal

Journal of Heredity – Oxford University Press

Published: Jul 1, 2005

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