Vacuolar proton pumping: more than the sum of its parts?
Petunia flower colour is dependent on vacuolar pH and is therefore used to study acidification mechanisms. Recently, it was shown that the concerted action of two tonoplast-localised P3-ATPases is required to hyperacidify vacuoles of petunia petal epidermis cells. Here we discuss how steep cross-tonoplast pH gradients may be established in specific cells.
Institute of Plant Biology, University of Zürich, Zollikerstrasse 107, CH-8008 Zürich, Switzerland. Electronic address: cornelia.eisenach@botinst.uzh.ch.
Cornelia
C
Eisenach
Institute of Plant Biology, University of Zürich, Zollikerstrasse 107, CH-8008 Zürich, Switzerland.
Ulrike
U
Baetz
Institute of Plant Biology, University of Zürich, Zollikerstrasse 107, CH-8008 Zürich, Switzerland.
Enrico
E
Martinoia
D000595:Amino Acid Sequence; D035264:Flowers / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D008969:Molecular Sequence Data; D032306:Petunia / Q000235:genetics / Q000378:metabolism*; D010860:Pigments, Biological / Q000378:metabolism; D019441:Plant Epidermis / Q000378:metabolism*; D017494:Proton Pumps / Q000235:genetics / Q000378:metabolism; D014617:Vacuoles / Q000378:metabolism*
D010860:Pigments, Biological; D017494:Proton Pumps