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Title: The Monosaccharide Transporter Gene, AtSTP4, and the Cell-Wall Invertase Atβfruct1, Are Induced in Arabidopsis during Infection with the Fungal Biotroph Erysiphe cichoracearum
Authors: Fotopoulos, Vasileios 
Gilbert, Martin J. 
Pittman, Jon K. 
Marvier, Alison C. 
Buchanan, Aram J. 
Sauer, Norbert 
Hall, John L. 
Williams, Lorraine E. 
Keywords: Beta-fructofuranosidase;Sucrose;Sucrose phosphate
Category: AGRICULTURAL SCIENCES;Agricultural Biotechnology;Other Agricultural Sciences
Field: Agricultural Sciences
Issue Date: 1-Jun-2003
Publisher: American Society of Plant Biologists
Source: Plant Physiology, Volume 132, Issue 2, 1 June 2003, Pages 821-829
Journal: Plant Physiology 
Abstract: Powdery mildew fungi are biotrophic pathogens that form a complex interface, the haustorium, between the host plant and the parasite. The pathogen acts as an additional sink, competing with host sinks, resulting in considerable modification of photoassimilate production and partitioning within the host tissue. Here, we examine the factors that may contribute to these changes. We show for the first time in one biotrophic interaction (Arabidopsis/Erysiphe cichoracearum) all of the following responses: Glc uptake in host tissues is enhanced after fungal infection; this coincides with the induction of expression of the monosaccharide transporter gene, Arabidopsis sugar transport protein 4 (AtSTP4), in infected leaves; invertase activity and transcript levels for a cell wall invertase, Atfruct1, increase substantially in Arabidopsis during attack by this pathogen. Before infection, Arabidopsis plants transformed with an AtSTP4 promoter--glucuronidase construct show expression mainly in sink tissues such as roots; after infection, AtSTP4 expression is induced in the mature leaves and increases over the 6-d time period. Sections of infected leaves stained for -glucuronidase show that AtSTP4 expression is not confined to infected epidermal cells but is also evident in a wider range of cells, including those of the vascular tissue. The results are discussed in relation to the possible coordinated expression of hexose transporters and cell wall invertase in the host response to powdery mildew infection.
ISSN: 00320889
DOI: 10.1104/pp.103.021428
Rights: American Society of Plant Biologists
Type: Article
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