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doi:10.1534/genetics.105.050500
A more recent version of this article appeared on April 1, 2006.
REGULAR RESEARCH PAPERS |
Substitution mapping of dth1.1, a flowering time QTL associated with transgressive variation in rice, reveals multiple sub-QTLs
Michael J. Thomson 1, Jeremy D. Edwards 1, Endang M. Septiningsih 2, Sandra E. Harrington 1 and Susan R. McCouch 1*
1 Cornell University
2 Indonesian Center for Ag. Biotechnology and Genetic R & D (ICABIOGRAD)
* To whom correspondence should be addressed. E-mail: srm4{at}cornell.edu.
Submitted on September 2, 2005
Revised on November 26, 2005
Accepted on 24 January 2006
A quantitative trait locus (QTL), dth1.1, was associated with transgressive variation for days to heading in an advanced backcross population derived from the Oryza sativa variety Jefferson and an accession of the wild rice relative Oryza rufipogon. A series of near-isogenic lines (NILs) containing different O. rufipogon introgressions across the target region were constructed to dissect dth1.1 using substitution mapping. In contrast to the late flowering O. rufipogon parent, O. rufipogon alleles in the substitution lines caused early flowering under both short and long day lengths and provided evidence for at least two distinct sub-QTLs: dth1.1a and dth1.1b. Potential candidate genes underlying these sub-QTLs include genes with sequence similarity to Arabidopsis GI, FT, SOC1, and EMF1, and Pharbitis nil PNZIP. Evidence from families with non-target O. rufipogon introgressions in combination with dth1.1 alleles also detected an early-flowering QTL on chromosome 4, a late-flowering QTL on chromosome 6, and provided evidence for additional sub-QTLs in the dth1.1 region. The availability of a series of near-isogenic lines with alleles introgressed from a wild relative of rice provides an opportunity to better understand the molecular basis of transgressive variation in a quantitative trait.
Key Words: Oryza sativa, QTL mapping, heading date, positional candidate gene analysis, transgressive variation
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