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PLANT PHYSIOLOGY , Vol 111, Issue 2 645-649, Copyright © 1996 by American Society of Plant Biologists
PIP1 Aquaporins Are Concentrated in Plasmalemmasomes of Arabidopsis thaliana Mesophyll
D. G. Robinson, H. Sieber, W. Kammerloher and A. R. Schaffner
Pflanzenphysiologisches Institut, Universitat Gottingen, Untere Karspule 2, D-37073 Gottingen, Germany (D.G.R.)
The PIP1 subfamily of water channel proteins (aquaporins) constitute about
1% of the plasma membrane (PM) proteins from Arabidopsis thaliana leaves.
Immunogold electron microscopy has confirmed their localization at the PM
of mesophyll cells. Very high labeling density at PM invaginations known as
plasmalemmasomes was observed. Therefore, we suggest that these subcellular
structures are involved in water transport between the apoplast and the
vacuole.
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