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Trends Plant Sci. 2001 Nov;6(11):514-9.

Calcium uptake by plant cells--channels and pumps acting in concert.

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Dept of Plant Sciences, University of Cambridge, Downing Street, CB2 3EA, Cambridge, UK.


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.

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