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Protoplasma. 2014 May;251(3):477-88. doi: 10.1007/s00709-013-0555-2. Epub 2013 Oct 5.

Pump up the volume - a central role for the plasma membrane H(+) pump in pollen germination and tube growth.

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Molecular Plant Biophysics and Biochemistry, Department of Molecular Biology, University of Salzburg, Billrothstr. 11, 5020, Salzburg, Austria.


The plasma membrane H(+) ATPase is a member of the P-ATPase family transporting H(+) from the cytosol to the extracellular space and thus energizing the plasma membrane for the uptake of ions and nutrients. As a housekeeping gene, this protein can be detected in almost every plant cell including the exclusive expression of specific isoforms in pollen grains and tubes where its activity is a prerequisite for successful germination and growth of pollen tubes. This review summarizes the current knowledge on pollen PM H(+) ATPases and hypothesizes a central role for pollen-specific isoforms of this protein in tube growth. External as well as cytosolic signals from signal transduction and metabolic pathways are integrated by the PM H(+) ATPase and directly translated to tube growth rates, allocating the PM H(+) ATPase to an essential node in the signalling network of pollen tubes in their race to the ovule.

[Indexed for MEDLINE]

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