Calcium uptake by plant cells--channels and pumps acting in concert.
How do plant cells accomplish a net uptake of Ca(2+) but keep the membrane potential under control? Consideration of the voltage dependence of the depolarization-activated calcium channel and hyperpolarization-activated calcium channel types, and two other major transporters in the plasma membrane, the H(+)-ATPase and I(K,out), suggests that one channel is well suited for both nutritive and signalling Ca(2+) uptake whereas the other could be limited to a signalling function.
Miedema
H
H
Dept of Plant Sciences, University of Cambridge, Downing Street, CB2 3EA, Cambridge, UK.
Bothwell
J H
JH
Brownlee
C
C
Davies
J M
JM
D017360:Arabidopsis / Q000378:metabolism; D029681:Arabidopsis Proteins; D002118:Calcium / Q000378:metabolism*; D015220:Calcium Channels / Q000378:metabolism*; D016623:Ion Pumps / Q000502:physiology*; D018408:Patch-Clamp Techniques; D010940:Plant Proteins / Q000378:metabolism; D015221:Potassium Channels / Q000378:metabolism; D024683:Potassium Channels, Tandem Pore Domain; D006180:Proton-Translocating ATPases / Q000235:genetics / Q000378:metabolism
D029681:Arabidopsis Proteins; D015220:Calcium Channels; D016623:Ion Pumps; C503455:KCO1 protein, Arabidopsis; D010940:Plant Proteins; D015221:Potassium Channels; D024683:Potassium Channels, Tandem Pore Domain; D006180:Proton-Translocating ATPases; D002118:Calcium