Theoretical and Applied Genetics

, Volume 111, Issue 6, pp 1137–1146

Genetic mapping and comparative analysis of seven mutants related to seed fiber development in cotton

Authors

  • Junkang Rong
    • Plant Genome Mapping LaboratoryUniversity of Georgia
  • Gary J. Pierce
    • Plant Genome Mapping LaboratoryUniversity of Georgia
  • Vijay N. Waghmare
    • Plant Genome Mapping LaboratoryUniversity of Georgia
  • Carl J. Rogers
    • Plant Genome Mapping LaboratoryUniversity of Georgia
  • Aparna Desai
    • Plant Genome Mapping LaboratoryUniversity of Georgia
    • Department of Crop and Soil SciencesUniversity of Georgia
  • Peng W. Chee
    • Plant Genome Mapping LaboratoryUniversity of Georgia
    • Coastal Plains Experiment StationUniversity of Georgia
  • O. Lloyd May
    • Coastal Plains Experiment StationUniversity of Georgia
  • John R. Gannaway
    • Texas A&M Research and Extension Center
  • Jonathan F. Wendel
    • Department of Ecology, Evolution, and Organismal BiologyIowa State University
  • Thea A. Wilkins
    • Department of Plant SciencesUniversity of California
    • Plant Genome Mapping LaboratoryUniversity of Georgia
    • Department of Crop and Soil SciencesUniversity of Georgia
Original Paper

DOI: 10.1007/s00122-005-0041-0

Cite this article as:
Rong, J., Pierce, G.J., Waghmare, V.N. et al. Theor Appl Genet (2005) 111: 1137. doi:10.1007/s00122-005-0041-0

Abstract

Mapping of genes that play major roles in cotton fiber development is an important step toward their cloning and manipulation, and provides a test of their relationships (if any) to agriculturally-important QTLs. Seven previously identified fiber mutants, four dominant (Li1, Li2, N1 and Fbl) and three recessive (n2, sma-4(ha), and sma-4(fz)), were genetically mapped in six F2 populations comprising 124 or more plants each. For those mutants previously assigned to chromosomes by using aneuploids or by linkage to other morphological markers, all map locations were concordant except n2, which mapped to the homoeolog of the chromosome previously reported. Three mutations with primary effects on fuzz fibers (N1, Fbl, n2) mapped near the likelihood peaks for QTLs that affected lint fiber productivity in the same populations, perhaps suggesting pleiotropic effects on both fiber types. However, only Li1 mapped within the likelihood interval for 191 previously detected lint fiber QTLs discovered in non-mutant crosses, suggesting that these mutations may occur in genes that played early roles in cotton fiber evolution, and for which new allelic variants are quickly eliminated from improved germplasm. A close positional association between sma-4(ha), two leaf and stem-borne trichome mutants (t1, t2), and a gene previously implicated in fiber development, sucrose synthase, raises questions about the possibility that these genes may be functionally related. Increasing knowledge of the correspondence of the cotton and Arabidopsis genomes provides several avenues by which genetic dissection of cotton fiber development may be accelerated.

Copyright information

© Springer-Verlag 2005