scholarly journals Role of Ca2+ and EGTA on Stomatal Movements in Commelina communis L.

1985 ◽  
Vol 79 (4) ◽  
pp. 1003-1005 ◽  
Author(s):  
Amnon Schwartz
Keyword(s):  
Commelina Communis ◽  
Stomatal Movements

Stomatal movements and ion fluxes within epidermis of Commelina communis L.

Nature ◽  
1974 ◽  
Vol 252 (5479) ◽  
pp. 126-127 ◽  
Author(s):  
C. M. WILLMER ◽  
J. E. PALLAS
Keyword(s):  
Ion Fluxes ◽  
Commelina Communis ◽  
Stomatal Movements

Myotubularins, PtdIns5P, and ROS in ABA-mediated stomatal movements in dehydrated Arabidopsis seedlings

2018 ◽  
Vol 45 (2) ◽  
pp. 259 ◽  
Author(s):  
Akanksha Nagpal ◽  
Ammar Hassan ◽  
Ivan Ndamukong ◽  
Zoya Avramova ◽  
František Baluška
Keyword(s):  
Cell Signalling ◽  
Membrane Dynamics ◽  
Dehydration Stress ◽  
Oxygen Species ◽  
Secondary Messenger ◽  
Signalling Molecule ◽  
Ros Accumulation ◽  
Evolutionarily Conserved ◽  
Stomatal Movements

Myotubularins (MTMs) are lipid phosphoinositide 3-phosphate phosphatases and the product of their enzyme activity – phosphoinositide 5-phosphate (PtdIns5P) – functions as a signalling molecule in pathways involved in membrane dynamics and cell signalling. Two Arabidopsis genes, AtMTM1 and AtMTM2, encode enzymatically active phosphatases but although AtMTM1 deficiency results in increased tolerance to dehydration stress and a decrease in cellular PtdIns5P, the role of AtMTM2 is less clear, as it does not contribute to the PtdIns5P pool upon dehydration stress. Here we analysed the involvement of AtMTM1, AtMTM2 and PtdIns5P in the response of Arabidopsis seedlings to dehydration stress/ABA, and found that both AtMTM1 and AtMTM2 were involved but affected oppositely stomata movement and the accumulation of reactive oxygen species (ROS, e.g. H2O2). Acting as a secondary messenger in the ABA-induced ROS production in guard cells, PtdIns5P emerges as an evolutionarily conserved signalling molecule that calibrates cellular ROS under stress. We propose the biological relevance of the counteracting AtMTM1 and AtMTM2 activities is to balance the ABA-induced ROS accumulation and cellular homeostasis under dehydration stress.

scholarly journals ABA signalling and metabolism are not essential for dark-induced stomatal closure but affect response speed

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ashley J. Pridgeon ◽  
Alistair M. Hetherington
Keyword(s):  
Metabolic Pathways ◽  
Stomatal Closure ◽  
Response Speed ◽  
Signalling Pathways ◽  
Delayed Response ◽  
Wild Type ◽  
Receptor Mutant ◽  
Stomatal Movements ◽  
Molecular Patterns

AbstractStomata are microscopic pores that open and close, acting to balance CO2 uptake with water loss. Stomata close in response to various signals including the drought hormone abscisic acid (ABA), microbe-associated-molecular-patterns, high CO2 levels, and darkness. The signalling pathways underlying ABA-induced stomatal closure are well known, however, the mechanism for dark-induced stomatal closure is less clear. ABA signalling has been suggested to play a role in dark-induced stomatal closure, but it is unclear how this occurs. Here we investigate the role of ABA in promoting dark-induced stomatal closure. Tracking stomatal movements on the surface of leaf discs we find, although steady state stomatal apertures are affected by mutations in ABA signalling and metabolism genes, all mutants investigated close in response to darkness. However, we observed a delayed response to darkness for certain ABA signalling and metabolism mutants. Investigating this further in the quadruple ABA receptor mutant (pyr1pyl1pyl2pyl4), compared with wild-type, we found reduced stomatal conductance kinetics. Although our results suggest a non-essential role for ABA in dark-induced stomatal closure, we show that ABA modulates the speed of the dark-induced closure response. These results highlight the role of ABA signalling and metabolic pathways as potential targets for enhancing stomatal movement kinetics.

scholarly journals Trehalose and trehalose-6-phosphate induce stomatal movements and interfere with ABA-induced stomatal closure in grapevine

OENO One ◽  
2015 ◽  
Vol 49 (3) ◽  
pp. 165 ◽  
Author(s):  
Magdalena Gamm ◽  
Marie-Claire Héloir ◽  
Marielle Adrian
Keyword(s):  
Stomatal Closure ◽  
Guard Cells ◽  
Oxygen Species ◽  
Light Conditions ◽  
Whole Plant ◽  
Low Concentrations ◽  
Stomatal Movements ◽  
Plant Level ◽  
First Time

<p style="text-align: justify;"><strong>Aims</strong>: The effects of trehalose and trehalose-6-phosphate (T6P), among other sugars, were assessed on grapevine stomatal movements.</p><p style="text-align: justify;"><strong>Methods and results</strong>: Epidermal peels were used to assess the effects of sugars. Low concentrations of trehalose and T6P (1 µM) induced an osmotic-independent reduction of the stomatal aperture in light conditions. Furthermore, ABA-induced stomatal closure was reduced by sugar application in association with lower accumulation of reactive oxygen species in guard cells. Similar effects, although weaker, were observed in response to the disaccharides sucrose and maltose, but not in response to the monosaccharides fructose and glucose.</p><p style="text-align: justify;"><strong>Conclusion</strong>: This study clearly highlights the effects of sugars, especially trehalose and T6P, on grapevine stomatal movements.</p><p style="text-align: justify;"><strong>Significance and impact of the study</strong>: This is the first time that such effects are described in grapevine and the results obtained provide new insights about the role of sugars on stomatal regulation at the whole plant level.</p>

scholarly journals The role of calcium in ABA-induced gene expression and stomatal movements

2001 ◽  
Vol 26 (3) ◽  
pp. 351-362 ◽  
Author(s):  
Alex A. R. Webb ◽  
Mark G. Larman ◽  
Lucy T. Montgomery ◽  
Jane E. Taylor ◽  
Alistair M. Hetherington
Keyword(s):  
Gene Expression ◽  
Stomatal Movements

Studies on the Role of Abscisic Acid in Stomatal Movements

1980 ◽  
pp. 274-285 ◽  
Author(s):  
K. Dörffling ◽  
D. Tietz ◽  
J. Streich ◽  
M. Ludewig
Keyword(s):  
Abscisic Acid ◽  
Stomatal Movements
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