Theoretical and Applied Genetics

, Volume 107, Issue 3, pp 479–493

Mapping quantitative trait loci for yield, yield components and morphological traits in an advanced backcross population between Oryza rufipogon and the Oryza sativa cultivar Jefferson

  • M. J. Thomson
  • T. H. Tai
  • A. M. McClung
  • X-H. Lai
  • M. E. Hinga
  • K. B. Lobos
  • Y. Xu
  • C. P. Martinez
  • S. R. McCouch
Article

DOI: 10.1007/s00122-003-1270-8

Cite this article as:
Thomson, M.J., Tai, T.H., McClung, A.M. et al. Theor Appl Genet (2003) 107: 479. doi:10.1007/s00122-003-1270-8

Abstract

An advanced backcross population between an accession of Oryza rufipogon (IRGC 105491) and the U.S. cultivar Jefferson (Oryza sativa ssp. japonica) was developed to identify quantitative trait loci (QTLs) for yield, yield components and morphological traits. The genetic linkage map generated for this population consisted of 153 SSR and RFLP markers with an average interval size of 10.3 cM. Thirteen traits were examined, nine of which were measured in multiple environments. Seventy-six QTLs above an experiment-wise significance threshold of P < 0.01 (corresponding to an interval mapping LOD > 3.6 or a composite interval mapping LOD > 3.9) were identified. For the traits measured in multiple environments, 47% of the QTLs were detected in at least two environments. The O. rufipogon allele was favorable for 53% of the yield and yield component QTLs, including loci for yield, grains per panicle, panicle length, and grain weight. Morphological traits related to the domestication process and/or weedy characteristics, including plant height, shattering, tiller type and awns, were found clustered on chromosomes 1 and 4. Comparisons to previous studies involving wild × cultivated crosses revealed O. rufipogon alleles with stable effects in multiple genetic backgrounds and environments, several of which have not been detected in studies between Oryza sativa cultivars, indicating potentially novel alleles from O. rufipogon. Some O. rufipogon-derived QTLs, however, were in similar regions as previously reported QTLs from Oryza sativa cultivars, providing evidence for conservation of these QTLs across the Oryza genus. In addition, several QTLs for grain weight, plant height, and flowering time were localized to putative homeologous regions in maize where QTLs for these traits have been previously reported, supporting the hypothesis of functional conservation of QTLs across the grasses.

Keywords

Quantitative trait locus (QTL) Advanced backcross QTL analysis (AB-QTL) Rice Domestication Comparative genetics 

Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • M. J. Thomson
    • 1
  • T. H. Tai
    • 2
  • A. M. McClung
    • 3
  • X-H. Lai
    • 3
  • M. E. Hinga
    • 4
  • K. B. Lobos
    • 4
  • Y. Xu
    • 4
  • C. P. Martinez
    • 5
  • S. R. McCouch
    • 1
  1. 1.Department of Plant Breeding, 240 Emerson Hall, Cornell University, Ithaca, NY 14853-1901, USA
  2. 2.USDA-ARS CPGRU and Department of Agronomy and Range Science, One Shields Ave, University of California, Davis, CA 95616 USA
  3. 3.USDA/ARS, 1509 Aggie Dr, Beaumont, TX 77713, USA
  4. 4.RiceTec, P.O. Box 1305, Alvin, TX 77512, USA
  5. 5.Centro Internacional de Agricultura Tropical, Apdo aereo 6713, Cali, Colombia

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