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JXB Advance Access published online on August 29, 2008
Journal of Experimental Botany, doi:10.1093/jxb/ern213
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© 2008 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

The paramutated SULFUREA locus of tomato is involved in auxin biosynthesis

Britta Ehlert1, Mark Aurel Schöttler1, Gilbert Tischendorf2, Jutta Ludwig-Müller3 and Ralph Bock1,*

1Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, D-14476 Potsdam-Golm, Germany
2Freie Universität Berlin, Institut für Biologie, Pflanzenphysiologie, D-14195 Berlin, Germany
3Institut für Botanik, Technische Universität Dresden, Zellescher Weg 20b, D-01062, Dresden, Germany

* To whom correspondence should be addressed: E-mail: rbock{at}mpimp-golm.mpg.de

The tomato (Solanum lycopersicum) sulfurea mutation displays trans-inactivation of wild-type alleles in heterozygous plants, a phenomenon referred to as paramutation. Homozygous mutant plants and paramutated leaf tissue of heterozygous plants show a pigment-deficient phenotype. The molecular basis of this phenotype and the function of the SULFUREA gene (SULF) are unknown. Here, a comprehensive physiological analysis of the sulfurea mutant is reported which suggests a molecular function for the SULFUREA locus. It is found that the sulf mutant is auxin-deficient and that the pigment-deficient phenotype is likely to represent only a secondary consequence of the auxin deficiency. This is most strongly supported by the isolation of a suppressor mutant which shows an auxin overaccumulation phenotype and contains elevated levels of indole-3-acetic acid (IAA). Several lines of evidence point to a role of the SULF gene in tryptophan-independent auxin biosynthesis, a pathway whose biochemistry and enzymology is still completely unknown. Thus, the sulfurea mutant may provide a promising entry point into elucidating the tryptophan-independent pathway of IAA synthesis.

Key words: Auxin, auxin biosynthesis, paramutation, photosynthesis, Solanum lycopersicum, sulfurea

Received 12 June 2008; Revised 23 July 2008 Accepted 24 July 2008


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