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Two plant Ca 2+ pumps expressed in stomatal guard cells show opposite expression patterns during cold stress
Author(s) -
Schiøtt Morten,
Palmgren Michael G.
Publication year - 2005
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.2005.00512.x
Subject(s) - guard cell , microbiology and biotechnology , arabidopsis , downregulation and upregulation , biology , chemistry , biophysics , gene , genetics , mutant
Guard cells respond to cold and other stimuli with an oscillating Ca 2+ signal, causing an opening or closing of the stomatal pore. However, the molecular basis for the regulation of Ca 2+ transients in guard cells has so far not been elucidated. We have localized the expression of two closely related Ca 2+ ‐ATPases, ACA8 and ACA10 , to guard cells in Arabidopsis . Whereas ACA8 expression was limited to guard cells and vascular tissues, ACA10 was found to be ubiquitously expressed. Upon cold treatment, the expression of ACA8 was found to be upregulated while that of ACA10 was downregulated. This finding was supported by the presence of the cold responsive C‐repeat/dehydration‐responsive element motif in the ACA8 promoter sequence.