Plant cells maintain high Ca2+ concentration gradients between the cytosol and the extracellular matrix, as well as intracellular compartments. During evolution, the regulatory mechanisms, maintaining low cytosolic free Ca2+ concentrations, most likely provided the backbone for the development of Ca2+-dependent signalling pathways. In this review, the current understanding of molecular mechanisms involved in Ca2+ homeostasis of plants cells is evaluated. The question is addressed to which extent the mechanisms, controlling the cytosolic Ca2+ concentration, are linked to Ca2+-based signalling. A large number of environmental stimuli can evoke Ca2+ signals, but the Ca2+-induced responses are likely to differ depending on the stimulus applied. Two mechanisms are put forward to explain signal specificity of Ca2+-dependent responses. A signal may evoke a specific Ca2+ signature that is recognized by downstream signalling components. Alternatively, Ca2+ signals are accompanied by Ca2+-independent signalling events that determine the specificity of the response. The existence of such parallel-acting pathways explains why guard cell responses to abscisic acid (ABA) can occur in the absence, as well as in the presence, of Ca2+ signals. Future research may shed new light on the relation between parallel acting Ca2+-dependent and -independent events, and may provide insights in their evolutionary origin.
%0 Journal Article
%1 roelfsema2010making
%A Roelfsema, M.R.G.
%A Hedrich, R.
%D 2010
%J Plant, cell & environment
%K ABA anion-channel ca2+-signals guard-cell light myown
%N 3
%P 305-321
%R 10.1111/j.1365-3040.2009.02075.x
%T Making sense out of Ca2+signals: their role in regulating stomatal movements
%U http://onlinelibrary.wiley.com/doi/10.1111/j.1365-3040.2009.02075.x/full
%V 33
%X Plant cells maintain high Ca2+ concentration gradients between the cytosol and the extracellular matrix, as well as intracellular compartments. During evolution, the regulatory mechanisms, maintaining low cytosolic free Ca2+ concentrations, most likely provided the backbone for the development of Ca2+-dependent signalling pathways. In this review, the current understanding of molecular mechanisms involved in Ca2+ homeostasis of plants cells is evaluated. The question is addressed to which extent the mechanisms, controlling the cytosolic Ca2+ concentration, are linked to Ca2+-based signalling. A large number of environmental stimuli can evoke Ca2+ signals, but the Ca2+-induced responses are likely to differ depending on the stimulus applied. Two mechanisms are put forward to explain signal specificity of Ca2+-dependent responses. A signal may evoke a specific Ca2+ signature that is recognized by downstream signalling components. Alternatively, Ca2+ signals are accompanied by Ca2+-independent signalling events that determine the specificity of the response. The existence of such parallel-acting pathways explains why guard cell responses to abscisic acid (ABA) can occur in the absence, as well as in the presence, of Ca2+ signals. Future research may shed new light on the relation between parallel acting Ca2+-dependent and -independent events, and may provide insights in their evolutionary origin.
@article{roelfsema2010making,
abstract = {Plant cells maintain high Ca2+ concentration gradients between the cytosol and the extracellular matrix, as well as intracellular compartments. During evolution, the regulatory mechanisms, maintaining low cytosolic free Ca2+ concentrations, most likely provided the backbone for the development of Ca2+-dependent signalling pathways. In this review, the current understanding of molecular mechanisms involved in Ca2+ homeostasis of plants cells is evaluated. The question is addressed to which extent the mechanisms, controlling the cytosolic Ca2+ concentration, are linked to Ca2+-based signalling. A large number of environmental stimuli can evoke Ca2+ signals, but the Ca2+-induced responses are likely to differ depending on the stimulus applied. Two mechanisms are put forward to explain signal specificity of Ca2+-dependent responses. A signal may evoke a specific Ca2+ signature that is recognized by downstream signalling components. Alternatively, Ca2+ signals are accompanied by Ca2+-independent signalling events that determine the specificity of the response. The existence of such parallel-acting pathways explains why guard cell responses to abscisic acid (ABA) can occur in the absence, as well as in the presence, of Ca2+ signals. Future research may shed new light on the relation between parallel acting Ca2+-dependent and -independent events, and may provide insights in their evolutionary origin.},
added-at = {2017-08-09T16:08:37.000+0200},
author = {Roelfsema, M.R.G. and Hedrich, R.},
biburl = {https://www.bibsonomy.org/bibtex/2d4d8ef7fb11f6ff3cf0b0d781b266810/robroelfsema},
doi = {10.1111/j.1365-3040.2009.02075.x},
interhash = {e15b2f0c8369d8fcb10541fd9cd77068},
intrahash = {d4d8ef7fb11f6ff3cf0b0d781b266810},
journal = {Plant, cell & environment},
keywords = {ABA anion-channel ca2+-signals guard-cell light myown},
number = 3,
pages = {305-321},
timestamp = {2017-08-09T16:08:37.000+0200},
title = {Making sense out of Ca2+signals: their role in regulating stomatal movements
},
url = {http://onlinelibrary.wiley.com/doi/10.1111/j.1365-3040.2009.02075.x/full},
volume = 33,
year = 2010
}