Turgor regulation in a novel Halomonas species

1993 ◽  
Vol 160 (4) ◽  
pp. 319-323 ◽  
Author(s):  
Stephen P. Cummings ◽  
Michael P. Williamson ◽  
D. James Gilmour
Keyword(s):  
Turgor Regulation ◽  
Halomonas Species

Short-term volume and turgor regulation in yeast

2008 ◽  
Vol 45 ◽  
pp. 147-160 ◽  
Author(s):  
Jörg Schaber ◽  
Edda Klipp
Keyword(s):  
Dynamic Model ◽  
Volume Change ◽  
Volume Regulation ◽  
Time Course ◽  
Osmotic Shock ◽  
Intracellular Concentration ◽  
Short Term ◽  
Hydrodynamic Property ◽  
Turgor Regulation ◽  
Thermodynamic Framework

Volume is a highly regulated property of cells, because it critically affects intracellular concentration. In the present chapter, we focus on the short-term volume regulation in yeast as a consequence of a shift in extracellular osmotic conditions. We review a basic thermodynamic framework to model volume and solute flows. In addition, we try to select a model for turgor, which is an important hydrodynamic property, especially in walled cells. Finally, we demonstrate the validity of the presented approach by fitting the dynamic model to a time course of volume change upon osmotic shock in yeast.

scholarly journals Two tonoplast MATE proteins function as turgor-regulating chloride channels inArabidopsis

2017 ◽  
Vol 114 (10) ◽  
pp. E2036-E2045 ◽  
Author(s):  
Haiwen Zhang ◽  
Fu-Geng Zhao ◽  
Ren-Jie Tang ◽  
Yuexuan Yu ◽  
Jiali Song ◽  
...  
Keyword(s):  
Chloride Channels ◽  
Ectopic Expression ◽  
Root Hairs ◽  
Large Family ◽  
Patch Clamp Recording ◽  
Mesophyll Cells ◽  
Environmental Signals ◽  
Turgor Regulation ◽  
Cell Turgor ◽  
Definition Of

The central vacuole in a plant cell occupies the majority of the cellular volume and plays a key role in turgor regulation. The vacuolar membrane (tonoplast) contains a large number of transporters that mediate fluxes of solutes and water, thereby adjusting cell turgor in response to developmental and environmental signals. We report that two tonoplast Detoxification efflux carrier (DTX)/Multidrug and Toxic Compound Extrusion (MATE) transporters, DTX33 and DTX35, function as chloride channels essential for turgor regulation inArabidopsis. Ectopic expression of each transporter inNicotiana benthamianamesophyll cells elicited a large voltage-dependent inward chloride current across the tonoplast, showing that DTX33 and DTX35 each constitute a functional channel. Both channels are highly expressed inArabidopsistissues, including root hairs and guard cells that experience rapid turgor changes during root-hair elongation and stomatal movements. Disruption of these two genes, either in single or double mutants, resulted in shorter root hairs and smaller stomatal aperture, with double mutants showing more severe defects, suggesting that these two channels function additively to facilitate anion influx into the vacuole during cell expansion. In addition,dtx35single mutant showed lower fertility as a result of a defect in pollen-tube growth. Indeed, patch-clamp recording of isolated vacuoles indicated that the inward chloride channel activity across the tonoplast was impaired in the double mutant. Because MATE proteins are widely known transporters of organic compounds, finding MATE members as chloride channels expands the functional definition of this large family of transporters.

scholarly journals Electrophysiology of Turgor Regulation in Marine Siphonous Green Algae

2006 ◽  
Vol 211 (1) ◽  
pp. 1-14 ◽  
Author(s):  
M.A. Bisson ◽  
M.J. Beilby ◽  
V.A. Shepherd
Keyword(s):  
Green Algae ◽  
Turgor Regulation

High level synthesis of levan by a novel Halomonas species growing on defined media

2009 ◽  
Vol 78 (4) ◽  
pp. 651-657 ◽  
Author(s):  
Annarita Poli ◽  
Hande Kazak ◽  
Bahar Gürleyendağ ◽  
Giuseppina Tommonaro ◽  
Giuseppina Pieretti ◽  
...  
Keyword(s):  
High Level Synthesis ◽  
Defined Media ◽  
High Level ◽  
Halomonas Species

scholarly journals Turgor regulation in the salt‐tolerant algaChara longifolia

2000 ◽  
Vol 23 (6) ◽  
pp. 629-637 ◽  
Author(s):  
N. A. Stento ◽  
N. Gerber Ryba ◽  
E. A. Kiegle ◽  
M. A. Bisson
Keyword(s):  
Salt Tolerant ◽  
Turgor Regulation
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