Diber et al., "Improving plant stress tolerance and yield production: is the tonoplast
aquaporin SlTIP2;2 a key to isohydric to anisohydric conversion?," New Phytologist, vol.
plasma membrane intrinsic proteins; qPCR, real-time polymerase chain reaction; TIPs, tonoplast
intrinsic proteins; XIPs, X-intrinsic proteins.
Potential ESTs from the MIP gene superfamily were identified using the keywords "aquaporin," "major intrinsic protein," "PIP," "TIP," "PIN," "SIP" "plasma membrane intrinsic protein" "tonoplast
intrinsic protein," "nodulin-26-like intrinsic protein" and "small basic intrinsic protein" in the EST annotations, or "water transporter" in the GO terms.
NaCl Induced Accumulation of Tonoplast
and Plasma Membrane [H.sup.+]-ATPase Message in Tomato.
The presence of V-ATPases is not exclusively restricted to the tonoplast
but they have also been detected in other subcellular fractions in the plant cell.
Activated SOS2 kinase regulates sodium efflux and sequestration of sodium into the vacuole by activating [Na.sup.+]/[H.sup.+] antiporters of plasma membrane and tonoplast
Arabidopsis V-ATPase activity at the tonoplast
is required for efcient nutrient storage but not for sodium accumulation.
The PIP2 protein, an aquaporin that specializes in osmotic fluid transport , functions as a water channel to transport water through the plasma membrane and tonoplast
to adjust the osmotic pressure under stress conditions [48, 49], exhibiting an inducible expression pattern during drought stress and peaking at expression level in the early stress period (3 days after water withdrawal), indicating that the expression of this gene might play a critical role in early drought defense.
Effects of salinity on activities of [H.sup.+]-ATPase, [H.sup.+]-PPase and membrane lipid composition in plasma membrane and tonoplast
vesicles from soybean (Glycine max L) seedlings.
Amongst other orthologs, mammalian AQP8- and the plant tonoplast
intrinsic protein (TIP)-type channels, which have been termed aquaammoniaporins (Jahn et al., 2002), are not unique in transporting ammonia.
As (III) or complexed As (III) is then transported across the tonoplast
and sequestered in the vacuole.
Ions are transported by [Na.sup.+]/[H.sup.+] antiport transporters on the tonoplast
or in the plasmatic membrane (APSE; BLUMWALD, 2007).