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JXB Advance Access originally published online on April 10, 2007
Journal of Experimental Botany 2007 58(7):1813-1823; doi:10.1093/jxb/erm040
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© 2007 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 ectopically parting cells 1-2 (epc1-2) mutant exhibits an exaggerated response to abscisic acid

Lindsay Bown1, Shinnosuke Kusaba1 *, Florence Goubet2 {dagger}, Lesley Codrai1, Aaron G. Dale2, Zhinong Zhang2, Xiaolan Yu2, Karl Morris1, Tadashi Ishii3, Carol Evered1, Paul Dupree2 and Stephen Jackson1,{ddagger}

1Warwick HRI, University of Warwick, Wellesbourne, Warwick CV35 9EF, UK
2Department of Biochemistry, Downing site, Cambridge CB2 1QW, UK
3Forestry and Forest Products Research Institute, 1 Matunosato, Tsukuba, Ibaraki, 305-8687, Japan

{ddagger} To whom correspondence should be addressed. E-mail: stephen.jackson{at}warwick.ac.uk

The ECTOPICALLY PARTING CELLS 1 (EPC1) gene encodes a putative retaining glycosyltransferase of the GT64 family, and epc1-1 mutant plants have a severely dwarfed phenotype. A new mutant allele of this gene, epc1-2, has been isolated. Reduced cell adhesion that has previously been reported for the epc1-1 mutant was not observed for either the epc1-1 or epc1-2 mutants grown in our conditions, suggesting that EPC1 does not affect cell adhesion but is involved in some other process affecting plant growth and development. It is shown that the epc1-2 mutant exhibits hypersensitivity to the phytohormone abscisic acid in germination and root elongation assays, however it shows an unaltered response to gibberellin, epi-brassinosteroid, auxin, or ethylene. An EPC1:YFP fusion protein is localized to small motile structures within the cytosol that are similar in size and number to the Golgi apparatus. Analysis of cell wall pectins revealed that levels of ß-(1,4)-galactan in the epc1-2 mutant are reduced by 50%, whilst other pectic polysaccharides (homogalacturonan, arabinan, and rhamnogalacturonan II) are unchanged.

Key words: ABA, cell wall, dwarf, galactan, pectin, root hair

* Present address: National Agricultural Research Center for Western Region 2575 Ikano, Zentsuji, Kagawa 765-0053, Japan.

{dagger} Present address: Bayer BioScience NV, Technologiepark 38, B-9052 Gent, Belgium.

Received 6 December 2006; Revised 14 February 2007 Accepted 14 February 2007


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