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Diurnal and light-regulated expression of AtSTP1 in guard cells of Arabidopsis
Citation
Stadler, R and Buttner, M and Ache, P and Hedrich, R and Ivashikina, N and Melzer, M and Shearson, SM and Smith, SM and Sauer, N, Diurnal and light-regulated expression of AtSTP1 in guard cells of Arabidopsis, Plant Physiology, 133, (2) pp. 528-537. ISSN 0032-0889 (2003) [Refereed Article]
Copyright Statement
Copyright 2003 American Society of Plant Biologists
DOI: doi:10.1104/pp.103.024240
Abstract
Guard cell chloroplasts are unable to perform significant photosynthetic CO2 fixation via Rubisco. Therefore, guard cells depend on carbon supply from adjacent cells even during the light period. Due
to their reversible turgor changes, this import cannot be mediated by plasmodesmata. Nevertheless, guard cells of several
plants were shown to use extracellular sugars or to accumulate sucrose as an osmoticum that drives water influx to increase
stomatal aperture. This paper describes the first localization of a guard cell-specific Arabidopsis sugar transporter involved
in carbon acquisition of these symplastically isolated cells. Expression of the AtSTP1 H+-monosacharide symporter gene in guard cells was demonstrated by in situ hybridization and by immunolocalization with an AtSTP1-specific
antiserum. Additional RNase protection analyses revealed a strong increase of AtSTP1 expression in the dark and a transient, diurnally regulated increase during the photoperiod around midday. This transient
increase in AtSTP1 expression correlates in time with the described guard cell-specific accumulation of sucrose. Our data suggest a function
of AtSTP1 in monosaccharide import into guard cells during the night and a possible role in osmoregulation during the day.
Item Details
Item Type: | Refereed Article |
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Keywords: | arabidopsis, guard cell, AtSTP1, light-regulated expression |
Research Division: | Biological Sciences |
Research Group: | Plant biology |
Research Field: | Plant physiology |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the biological sciences |
UTAS Author: | Smith, SM (Professor Steven Smith) |
ID Code: | 101545 |
Year Published: | 2003 |
Web of Science® Times Cited: | 97 |
Deposited By: | Plant Science |
Deposited On: | 2015-06-25 |
Last Modified: | 2015-09-21 |
Downloads: | 0 |
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