An Alpha-galactosidase with an Essential Function During Leaf Development

Overview

Journal Planta

Specialty Biology

Date 2006 Jul 18

PMID 16845526

Citations 23

Authors

Bozena Chrost

Uener Kolukisaoglu

Burkhard Schulz

Karin Krupinska

Affiliations

Soon will be listed here.

Abstract

The putative alpha-galactosidase gene HvSF11 of barley, previously shown to be expressed during dark induced senescence, is expressed in the growing/elongating zone of primary foliage leaves of barley. The amino acid sequence deduced from the full length HvSF11 cDNA contains a hydrophobic signal sequence at the N-terminus. Phylogenetic relationship of the HvSF11 encoded barley alpha-galactosidase to other alpha-galactosidases revealed high homology with the alpha-galactosidase encoded by the gene At5g08370 from Arabidopsis thaliana. We have isolated two independent heterozygous At5g08370 T-DNA insertion mutants from Arabidopsis thaliana, both of which have a higher number of rosette leaves with a curly surface leaf morphology and delayed flowering time in comparison to wildtype plants. Localization of the Arabidopsis alpha-galactosidase protein via GUS-tag revealed that the protein is associated with the cell wall. This result was confirmed by immunological detection of the orthologous barley protein in a protein fraction derived from cell walls of barley leaves. It is concluded that the alpha-galactosidase proteins from barley and Arabidopsis might fulfill an important role in leaf development by functioning in cell wall loosening and cell wall expansion.

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