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Plant and Cell Physiology Advance Access published online on January 30, 2009
Plant and Cell Physiology, doi:10.1093/pcp/pcp015
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© The Author 2009. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Aberrant cell expansion in the elongation mutants of barley

Dyani Lewis1,*, Antony Bacic1, Peter M. Chandler2 and Edward J. Newbigin1

1Plant Cell Biology Research Centre and Australian Centre for Plant Functional Genomics, School of Botany, University of Melbourne, Parkville, VIC, 3010, Australia
2CSIRO, Plant Industry, Canberra, ACT, 2601, Australia

Corresponding Author: Dr. Edward Newbigin. Address: PCBRC, School of Botany, University of Melbourne, Parkville, 3010, Australia. ph: +61 3 8344 4871, fax: +61 3 9347 1071, email: edwardjn{at}unimelb.edu.au


  Abstract

The elongation (elo) mutants of barley (Hordeum vulgare cv ‘Himalaya’) are a class of dwarf plants with defects affecting cell expansion. Phenotypes of mutants in three of the elo loci (elo1, elo2 and elo3) are recessive to the wild-type allele and the mutations at elo-4 and elo 5 are semi-dominant. Allelism tests showed that elo1, elo2 and elo3 were at separate loci and mapping data indicated that elo-5 was possibly allelic to either elo1 or elo2. A phenotype common to all elo mutants was the presence of short, radially swollen cells on the leaf epidermis, indicating a defect in longitudinal cell expansion. In three of the mutants, elo1, elo3 and elo5, this was accompanied by a twisting growth habit. Two of the mutations, elo2 and elo 5, affected cell division, with aberrant periclinal cell division resulting in the formation of increased cell layers in the leaf epidermis of elo2 and elo-5 homozygotes and in the aleurone layer of elo2 grains. Misplaced anticlinal divisions also occurred in the elo-5 leaf epidermis. Leaf cell walls of all elo lines contained less cellulose than wild-type and the cortical microtubules in elongating root epidermal cells in some elo lines were more randomly oriented than in wild-type, consistent with the presence of radially swollen cells. We discuss possible functions for the Elo genes in primary cell wall synthesis.

Keywords: Barley - cell expansion - cell wall - Hordeum vulgare

*Current address: School of Biological Sciences, Monash University, Clayton, VIC, 3800, Australia

(Received December 15, 2008; Accepted January 23, 2009)
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