Light-Regulated Stomatal Aperture in Arabidopsis

Chen, Chen; Xiao, Yuguo; Li, Xin; Ni, Min

doi:10.1093/mp/sss039

Cited by 87 publications

(71 citation statements)

References 68 publications

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“…Wang et al (2014a), in this issue, have undertaken such an approach using OnGuard models for V. faba and Arabidopsis (Chen et al, 2012a;Hills et al, 2012;Wang et al, 2012). OnGuard models incorporate all of our knowledge of molecular, biophysical, and kinetic characteristics of guard cell transport, Mal metabolism, and H + and Ca 2+ buffering, and they link this knowledge to stomatal aperture.…”

Section: Ion Transport Stomatal Response and Wuementioning

confidence: 99%

Stomatal Size, Speed, and Responsiveness Impact on Photosynthesis and Water Use Efficiency

2014

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The control of gaseous exchange between the leaf and bulk atmosphere by stomata governs CO 2 uptake for photosynthesis and transpiration, determining plant productivity and water use efficiency. The balance between these two processes depends on stomatal responses to environmental and internal cues and the synchrony of stomatal behavior relative to mesophyll demands for CO 2 . Here we examine the rapidity of stomatal responses with attention to their relationship to photosynthetic CO 2 uptake and the consequences for water use. We discuss the influence of anatomical characteristics on the velocity of changes in stomatal conductance and explore the potential for manipulating the physical as well as physiological characteristics of stomatal guard cells in order to accelerate stomatal movements in synchrony with mesophyll CO 2 demand and to improve water use efficiency without substantial cost to photosynthetic carbon fixation. We conclude that manipulating guard cell transport and metabolism is just as, if not more likely to yield useful benefits as manipulations of their physical and anatomical characteristics. Achieving these benefits should be greatly facilitated by quantitative systems analysis that connects directly the molecular properties of the guard cells to their function in the field.In order for plants to function efficiently, they must balance gaseous exchange between inside and outside the leaf to maximize CO 2 uptake for photosynthetic carbon assimilation (A) and to minimize water loss through transpiration. Stomata are the "gatekeepers" responsible for all gaseous diffusion, and they adjust to both internal and external environmental stimuli governing CO 2 uptake and water loss. The pathway for CO 2 uptake from the bulk atmosphere to the site of fixation is determined by a series of diffusional resistances, which start with the layer of air immediately surrounding the leaf (the boundary layer). Stomatal pores provide a major resistance to flux from the atmosphere to the substomatal cavity within the leaf. Further resistance is encountered by CO 2 across the aqueous and lipid boundaries into the mesophyll cell and chloroplasts (mesophyll resistance). Water leaving the leaf largely follows the same pathway in reverse, but without the mesophyll resistance component. Guard cells surround the stomatal pore. They increase or decrease in volume in response to external and internal stimuli, and the resulting changes in guard cell shape adjust stomatal aperture and thereby affect the flux of gases between the leaf internal environment and the bulk atmosphere. Stomatal behavior, therefore, controls the volume of CO 2 entering the intercellular air spaces of the leaf for photosynthesis. It also plays a key role in minimizing the amount of water lost. Transpiration, by virtue of the concentration differences, is an order of magnitude greater than CO 2 uptake, which is an inevitable consequence of free diffusion across this pathway. Although the cumulative area of stomatal pores only represents a small fraction...

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Section: Ion Transport Stomatal Response and Wuementioning

confidence: 99%

Stomatal Size, Speed, and Responsiveness Impact on Photosynthesis and Water Use Efficiency

2014

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“…10,11 ABA triggers a signaling network in guard cells that includes protein kinases and leads to activation of anion channels and the outward movement of anions, resulting in loss of turgor and reduction of the stomatal aperture. [12][13][14][15][16][17] Blue light triggers stomatal opening in most plants 18 by a signaling network that involves protein kinases and results in the phosphorylation and activation of the H C -ATPase in the plasma membrane of the guard cell. [19][20][21][22][23] Loss of H C leads to uptake of K C , increase in turgor, and increase of the stomatal aperture.…”

Section: Introductionmentioning

confidence: 99%

Protein phosphorylation in stomatal movement

Zhang

Chen

Harmon

2014

Plant Signaling & Behavior

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“…Stomatal movements are regulated by a variety of factors that stimulate opening and closure (Kim et al, 2010;Araújo et al, 2011;Chen et al, 2012). It has been reported that stomatal movement may be influenced by UV-B, and the response observed (opening or closure) is dependent on the fluence rate (Nogues et al, 1999;Jansen and Noort, 2000;Eisinger et al, 2003;He et al, 2005He et al, , 2013.…”

mentioning

confidence: 99%

Ultraviolet-B-Induced Stomatal Closure in Arabidopsis Is Regulated by the UV RESISTANCE LOCUS8 Photoreceptor in a Nitric Oxide-Dependent Mechanism

et al. 2014

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UV RESISTANCE LOCUS8 (UVR8) signaling involves CONSTITUTIVELY PHOTOMORPHOGENIC1, the ELONGATED HYPOCOTYL5 (HY5) transcription factor, and the closely related HY5 HOMOLOG. Some UV-B responses mediated by UVR8 are also regulated by nitric oxide (NO), a bioactive molecule that orchestrates a wide range of processes in plants. In this study, we investigated the participation of the UVR8 pathway and its interaction with NO in UV-B-induced stomatal movements in Arabidopsis (Arabidopsis thaliana). Stomata in abaxial epidermal strips of Arabidopsis ecotype Landsberg erecta closed in response to increasing UV-B fluence rates, with maximal closure after 3-h exposure to 5.46 mmol m -2 s -1 UV-B. Both hydrogen peroxide (H 2 O 2 ) and NO increased in response to UV-B, and stomatal closure was maintained by NO up to 24 h after the beginning of exposure. Stomata of plants expressing bacterial NO dioxygenase, which prevents NO accumulation, did not close in response to UV-B, although H 2 O 2 still increased. When the uvr8-1 null mutant was exposed to UV-B, stomata remained open, irrespective of the fluence rate. Neither NO nor H 2 O 2 increased in stomata of the uvr8-1 mutant. However, the NO donor S-nitrosoglutathione induced closure of uvr8-1 stomata to the same extent as in the wild type. Experiments with mutants in UVR8 signaling components implicated CONSTITUTIVELY PHOTOMORPHOGENIC1, HY5, and HY5 HOMOLOG in UV-B-induced stomatal closure. This research provides evidence that the UVR8 pathway regulates stomatal closure by a mechanism involving both H 2 O 2 and NO generation in response to UV-B exposure.

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Light-Regulated Stomatal Aperture in Arabidopsis

Cited by 87 publications

References 68 publications

Stomatal Size, Speed, and Responsiveness Impact on Photosynthesis and Water Use Efficiency

Stomatal Size, Speed, and Responsiveness Impact on Photosynthesis and Water Use Efficiency

Protein phosphorylation in stomatal movement

Ultraviolet-B-Induced Stomatal Closure in Arabidopsis Is Regulated by the UV RESISTANCE LOCUS8 Photoreceptor in a Nitric Oxide-Dependent Mechanism

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