Abstract
The Ca2+ in the cytoplasm has to be kept under very low levels and hence requires extrusion or efflux mechanism for this job. Two families of active transporters in the plant cell facilitate the transport function. The P-type ATPases (ER-Type Ca2+-ATPases (ECA) and P2B are autoinhibited Ca2+-ATPases (ACA)) and the Ca2+/cation antiporter (CaCA) members perform the task of Ca2+ extrusion from the plant cell cytoplasm. Both of them are multimember families with conserved architecture and regulatory mechanism. We discuss these two families in this chapter.
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