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Fuji S, Yamauchi S, Sugiyama N, Kohchi T, Nishihama R, Shimazaki KI, Takemiya A. Light-induced stomatal opening requires phosphorylation of the C-terminal autoinhibitory domain of plasma membrane H +-ATPase. Nat Commun 2024; 15:1195. [PMID: 38378726 PMCID: PMC10879506 DOI: 10.1038/s41467-024-45236-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 01/16/2024] [Indexed: 02/22/2024] Open
Abstract
Plasma membrane H+-ATPase provides the driving force for light-induced stomatal opening. However, the mechanisms underlying the regulation of its activity remain unclear. Here, we show that the phosphorylation of two Thr residues in the C-terminal autoinhibitory domain is crucial for H+-ATPase activation and stomatal opening in Arabidopsis thaliana. Using phosphoproteome analysis, we show that blue light induces the phosphorylation of Thr-881 within the C-terminal region I, in addition to penultimate Thr-948 in AUTOINHIBITED H+-ATPASE 1 (AHA1). Based on site-directed mutagenesis experiments, phosphorylation of both Thr residues is essential for H+ pumping and stomatal opening in response to blue light. Thr-948 phosphorylation is a prerequisite for Thr-881 phosphorylation by blue light. Additionally, red light-driven guard cell photosynthesis induces Thr-881 phosphorylation, possibly contributing to red light-dependent stomatal opening. Our findings provide mechanistic insights into H+-ATPase activation that exploits the ion transport across the plasma membrane and light signalling network in guard cells.
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Affiliation(s)
- Saashia Fuji
- Department of Biology, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, 753-8512, Japan
| | - Shota Yamauchi
- Department of Biology, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, 753-8512, Japan
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, Chiba, Japan
| | - Naoyuki Sugiyama
- Department of Molecular & Cellular BioAnalysis, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, 606-8501, Japan
| | - Takayuki Kohchi
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8502, Japan
| | - Ryuichi Nishihama
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8502, Japan
- Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Ken-Ichiro Shimazaki
- Department of Biology, Faculty of Science, Kyushu University, 744 Motooka, Fukuoka, 819-0395, Japan
| | - Atsushi Takemiya
- Department of Biology, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, 753-8512, Japan.
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2
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John SP, Svihla ZT, Hasenstein KH. Changes in endogenous abscisic acid and stomata of the resurrection fern, Pleopeltis polypodioides, in response to de- and rehydration. AMERICAN JOURNAL OF BOTANY 2023; 110:e16152. [PMID: 36896495 DOI: 10.1002/ajb2.16152] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 02/12/2023] [Accepted: 02/13/2023] [Indexed: 05/11/2023]
Abstract
PREMISE While angiosperms respond uniformly to abscisic acid (ABA) by stomatal closure, the response of ferns to ABA is ambiguous. We evaluated the effect of endogenous ABA, hydrogen peroxide (H2 O2 ), nitric oxide (NO), and Ca2+ , low and high light intensities, and blue light (BL) on stomatal opening of Pleopeltis polypodioides. METHODS Endogenous ABA was quantified using gas chromatography-mass spectrometry; microscopy results and stomatal responses to light and chemical treatments were analyzed with Image J. RESULTS The ABA content increases during initial dehydration, peaks at 15 h and then decreases to one fourth of the ABA content of hydrated fronds. Following rehydration, ABA content increases within 24 h to the level of hydrated tissue. The stomatal aperture opens under BL and remains open even in the presence of ABA. Closure was strongly affected by BL, NO, and Ca2+ , regardless of ABA, H2 O2 effect was weak. CONCLUSIONS The decrease in the ABA content during extended dehydration and insensitivity of the stomata to ABA suggests that the drought tolerance mechanism of Pleopeltis polypodioides is independent of ABA.
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Affiliation(s)
- Susan P John
- Department of Biology, University of Louisiana at Lafayette, Lafayette, LA, 70503, USA
| | - Zachary T Svihla
- Department of Biology, University of Louisiana at Lafayette, Lafayette, LA, 70503, USA
| | - Karl H Hasenstein
- Department of Biology, University of Louisiana at Lafayette, Lafayette, LA, 70503, USA
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3
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Ando E, Kollist H, Fukatsu K, Kinoshita T, Terashima I. Elevated CO 2 induces rapid dephosphorylation of plasma membrane H + -ATPase in guard cells. THE NEW PHYTOLOGIST 2022; 236:2061-2074. [PMID: 36089821 PMCID: PMC9828774 DOI: 10.1111/nph.18472] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Accepted: 08/26/2022] [Indexed: 06/15/2023]
Abstract
Light induces stomatal opening, which is driven by plasma membrane (PM) H+ -ATPase in guard cells. The activation of guard-cell PM H+ -ATPase is mediated by phosphorylation of the penultimate C-terminal residue, threonine. The phosphorylation is induced by photosynthesis as well as blue light photoreceptor phototropin. Here, we investigated the effects of cessation of photosynthesis on the phosphorylation level of guard-cell PM H+ -ATPase in Arabidopsis thaliana. Immunodetection of guard-cell PM H+ -ATPase, time-resolved leaf gas-exchange analyses and stomatal aperture measurements were carried out. We found that light-dark transition of leaves induced dephosphorylation of the penultimate residue at 1 min post-transition. Gas-exchange analyses confirmed that the dephosphorylation is accompanied by an increase in the intercellular CO2 concentration, caused by the cessation of photosynthetic CO2 fixation. We discovered that CO2 induces guard-cell PM H+ -ATPase dephosphorylation as well as stomatal closure. Interestingly, reverse-genetic analyses using guard-cell CO2 signal transduction mutants suggested that the dephosphorylation is mediated by a mechanism distinct from the established CO2 signalling pathway. Moreover, type 2C protein phosphatases D6 and D9 were required for the dephosphorylation and promoted stomatal closure upon the light-dark transition. Our results indicate that CO2 -mediated dephosphorylation of guard-cell PM H+ -ATPase underlies stomatal closure.
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Affiliation(s)
- Eigo Ando
- Department of Biological Sciences, School of ScienceThe University of TokyoHongo 7‐3‐1, BunkyoTokyo113‐0033Japan
- Division of Biological Science, Graduate School of ScienceNagoya UniversityFuro‐cho, ChikusaNagoyaAichi464‐8602Japan
| | - Hannes Kollist
- Institute of TechnologyUniversity of TartuTartu50411Estonia
| | - Kohei Fukatsu
- Division of Biological Science, Graduate School of ScienceNagoya UniversityFuro‐cho, ChikusaNagoyaAichi464‐8602Japan
| | - Toshinori Kinoshita
- Division of Biological Science, Graduate School of ScienceNagoya UniversityFuro‐cho, ChikusaNagoyaAichi464‐8602Japan
- Institute of Transformative Bio‐Molecules (WPI‐ITbM)Nagoya UniversityFuro‐cho, ChikusaNagoyaAichi464‐8602Japan
| | - Ichiro Terashima
- Department of Biological Sciences, School of ScienceThe University of TokyoHongo 7‐3‐1, BunkyoTokyo113‐0033Japan
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4
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Jones JJ, Huang S, Hedrich R, Geilfus CM, Roelfsema MRG. The green light gap: a window of opportunity for optogenetic control of stomatal movement. THE NEW PHYTOLOGIST 2022; 236:1237-1244. [PMID: 36052708 DOI: 10.1111/nph.18451] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 08/17/2022] [Indexed: 06/15/2023]
Abstract
Green plants are equipped with photoreceptors that are capable of sensing radiation in the ultraviolet-to-blue and the red-to-far-red parts of the light spectrum. However, plant cells are not particularly sensitive to green light (GL), and light which lies within this part of the spectrum does not efficiently trigger the opening of stomatal pores. Here, we discuss the current knowledge of stomatal responses to light, which are either provoked via photosynthetically active radiation or by specific blue light (BL) signaling pathways. The limited impact of GL on stomatal movements provides a unique option to use this light quality to control optogenetic tools. Recently, several of these tools have been optimized for use in plant biological research, either to control gene expression, or to provoke ion fluxes. Initial studies with the BL-activated potassium channel BLINK1 showed that this tool can speed up stomatal movements. Moreover, the GL-sensitive anion channel GtACR1 can induce stomatal closure, even at conditions that provoke stomatal opening in wild-type plants. Given that crop plants in controlled-environment agriculture and horticulture are often cultivated with artificial light sources (i.e. a combination of blue and red light from light-emitting diodes), GL signals can be used as a remote-control signal that controls stomatal transpiration and water consumption.
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Affiliation(s)
- Jeffrey J Jones
- Division of Controlled Environment Horticulture, Faculty of Life Sciences, Albrecht Daniel Thaer-Institute of Agricultural and Horticultural Sciences, Humboldt-University of Berlin, Berlin, 14195, Germany
| | - Shouguang Huang
- Molecular Plant Physiology and Biophysics, Biocenter, University of Würzburg, 97082, Würzburg, Germany
| | - Rainer Hedrich
- Molecular Plant Physiology and Biophysics, Biocenter, University of Würzburg, 97082, Würzburg, Germany
| | - Christoph-Martin Geilfus
- Division of Controlled Environment Horticulture, Faculty of Life Sciences, Albrecht Daniel Thaer-Institute of Agricultural and Horticultural Sciences, Humboldt-University of Berlin, Berlin, 14195, Germany
- Department of Soil Science and Plant Nutrition, Hochschule Geisenheim University, 65366, Geisenheim, Germany
| | - M Rob G Roelfsema
- Molecular Plant Physiology and Biophysics, Biocenter, University of Würzburg, 97082, Würzburg, Germany
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Yang J, Song J, Jeong BR. Low-Intensity Blue Light Supplemented during Photoperiod in Controlled Environment Induces Flowering and Antioxidant Production in Kalanchoe. Antioxidants (Basel) 2022; 11:antiox11050811. [PMID: 35624675 PMCID: PMC9137757 DOI: 10.3390/antiox11050811] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 04/19/2022] [Accepted: 04/19/2022] [Indexed: 11/16/2022] Open
Abstract
Kalanchoe (Kalanchoe blossfeldiana) is a qualitative short-day plant with a high aesthetic value. When the night length is less than a specified cultivar-dependent critical value, however, it does not develop flowers. This study investigated the effects of low-intensity supplementary or night interrupting (NI) blue (B) light on the plant performance and flower induction in kalanchoe ‘Rudak’. During the photoperiod in a closed-type plant factory with day/night temperatures of 23 °C/18 °C, white (W) LEDs were utilized to produce a photosynthetic photon flux density (PPFD) of 300 μmol m−2 s−1, and B LEDs were used to give supplementary/NI light at a PPFD of 10 μmol m−2 s−1. The control plants were exposed to a 10-h short day (SD, positive control) or a 13-h long day (LD, negative control) treatment without any B light. The B light was used for 4 h either (1) to supplement the W LEDs at the end of the SD (SD + 4B) and LD (LD + 4B), or (2) to provide night interruption (NI) in the SD (SD + NI-4B) and LD (LD + NI-4B). The LD + 4B and LD + NI-4B significantly enhanced plant growth and development, followed by the SD + 4B and SD + NI-4B treatments. In addition, the photosynthesis, physiological parameters, and activity of antioxidant systems were improved in those treatments. Except in the LD and LD + NI-4B, all plants flowered. It is noteworthy that kalanchoe ‘Rudak’ flowered in the LD + 4B treatment and induced the greatest number of flowers, followed by SD + NI-4B and SD + 4B. Plants grown in the LD + 4B treatment had the highest expression levels of certain monitored genes related to flowering. The results indicate that a 4-h supplementation of B light during the photoperiod in both the SD and LD treatments increased flower bud formation, promoted flowering, and enhanced plant performance. Kalanchoe ‘Rudak’ flowered especially well in the LD + 4B, presenting a possibility of practically inducing flowering in long-day seasons with B light application.
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Affiliation(s)
- Jingli Yang
- Department of Horticulture, Division of Applied Life Science (BK21 Four), Graduate School of Gyeongsang National University, Jinju 52828, Korea; (J.Y.); (J.S.)
| | - Jinnan Song
- Department of Horticulture, Division of Applied Life Science (BK21 Four), Graduate School of Gyeongsang National University, Jinju 52828, Korea; (J.Y.); (J.S.)
| | - Byoung Ryong Jeong
- Department of Horticulture, Division of Applied Life Science (BK21 Four), Graduate School of Gyeongsang National University, Jinju 52828, Korea; (J.Y.); (J.S.)
- Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Korea
- Research Institute of Life Science, Gyeongsang National University, Jinju 52828, Korea
- Correspondence: ; Tel.: +82-55-772-1913
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6
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Dubeaux G, Hsu PK, Ceciliato PHO, Swink KJ, Rappel WJ, Schroeder JI. Deep dive into CO2-dependent molecular mechanisms driving stomatal responses in plants. PLANT PHYSIOLOGY 2021; 187:2032-2042. [PMID: 35142859 PMCID: PMC8644143 DOI: 10.1093/plphys/kiab342] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 06/30/2021] [Indexed: 05/04/2023]
Abstract
Recent advances are revealing mechanisms mediating CO2-regulated stomatal movements in Arabidopsis, stomatal architecture and stomatal movements in grasses, and the long-term impact of CO2 on growth.
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Affiliation(s)
- Guillaume Dubeaux
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California 92093-0116, USA
| | - Po-Kai Hsu
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California 92093-0116, USA
| | - Paulo H O Ceciliato
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California 92093-0116, USA
| | - Kelsey J Swink
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California 92093-0116, USA
| | - Wouter-Jan Rappel
- Physics Department, University of California San Diego, La Jolla, California 92093-0116, USA
| | - Julian I Schroeder
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, California 92093-0116, USA
- Author for communication:
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Vialet-Chabrand S, Matthews JSA, Lawson T. Light, power, action! Interaction of respiratory energy- and blue light-induced stomatal movements. THE NEW PHYTOLOGIST 2021; 231:2231-2246. [PMID: 34101837 DOI: 10.1111/nph.17538] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 05/26/2021] [Indexed: 05/07/2023]
Abstract
Although the signalling pathway of blue light (BL)-dependent stomatal opening is well characterized, little is known about the interspecific diversity, the role it plays in the regulation of gas exchange and the source of energy used to drive the commonly observed increase in pore aperture. Using a combination of red and BL under ambient and low [O2 ] (to inhibit respiration), the interaction between BL, photosynthesis and respiration in determining stomatal conductance was investigated. These findings were used to develop a novel model to predict the feedback between photosynthesis and stomatal conductance under these conditions. Here we demonstrate that BL-induced stomatal responses are far from universal, and that significant species-specific differences exist in terms of both rapidity and magnitude. Increased stomatal conductance under BL reduced photosynthetic limitation, at the expense of water loss. Moreover, we stress the importance of the synergistic effect of BL and respiration in driving rapid stomatal movements, especially when photosynthesis is limited. These observations will help reshape our understanding of diurnal gas exchange in order to exploit the dynamic coordination between the rate of carbon assimilation (A) and stomatal conductance (gs ), as a target for enhancing crop performance and water use efficiency.
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Affiliation(s)
| | - Jack S A Matthews
- School of Life Sciences, University of Essex, Colchester, CO4 3SQ, UK
| | - Tracy Lawson
- School of Life Sciences, University of Essex, Colchester, CO4 3SQ, UK
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8
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Hosotani S, Yamauchi S, Kobayashi H, Fuji S, Koya S, Shimazaki KI, Takemiya A. A BLUS1 kinase signal and a decrease in intercellular CO2 concentration are necessary for stomatal opening in response to blue light. THE PLANT CELL 2021; 33:1813-1827. [PMID: 33665670 PMCID: PMC8254492 DOI: 10.1093/plcell/koab067] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 02/20/2021] [Indexed: 05/20/2023]
Abstract
Light-induced stomatal opening stimulates CO2 uptake and transpiration in plants. Weak blue light under strong red light effectively induces stomatal opening. Blue light-dependent stomatal opening initiates light perception by phototropins, and the signal is transmitted to a plasma membrane H+-ATPase in guard cells via BLUE LIGHT SIGNALING 1 (BLUS1) kinase. However, it is unclear how BLUS1 transmits the signal to H+-ATPase. Here, we characterized BLUS1 signaling in Arabidopsis thaliana, and showed that the BLUS1 C-terminus acts as an auto-inhibitory domain and that phototropin-mediated Ser-348 phosphorylation within the domain removes auto-inhibition. C-Terminal truncation and phospho-mimic Ser-348 mutation caused H+-ATPase activation in the dark, but did not elicit stomatal opening. Unexpectedly, the plants exhibited stomatal opening under strong red light and stomatal closure under weak blue light. A decrease in intercellular CO2 concentration via red light-driven photosynthesis together with H+-ATPase activation caused stomatal opening. Furthermore, phototropins caused H+-ATPase dephosphorylation in guard cells expressing constitutive signaling variants of BLUS1 in response to blue light, possibly for fine-tuning stomatal opening. Overall, our findings provide mechanistic insights into the blue light regulation of stomatal opening.
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Affiliation(s)
- Sakurako Hosotani
- Department of Biology, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 753-8512, Japan
| | - Shota Yamauchi
- Department of Biology, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 753-8512, Japan
| | - Haruki Kobayashi
- Department of Biology, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 753-8512, Japan
| | - Saashia Fuji
- Department of Biology, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 753-8512, Japan
| | - Shigekazu Koya
- Department of Biology, Kyushu University, Fukuoka 819-0395, Japan
| | | | - Atsushi Takemiya
- Department of Biology, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 753-8512, Japan
- Author for correspondence:
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9
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Geilfus CM, Zhang X, Mithöfer A, Burgel L, Bárdos G, Zörb C. Leaf apoplastic alkalization promotes transcription of the ABA-synthesizing enzyme Vp14 and stomatal closure in Zea mays. JOURNAL OF EXPERIMENTAL BOTANY 2021; 72:2686-2695. [PMID: 33345268 PMCID: PMC8006549 DOI: 10.1093/jxb/eraa589] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Accepted: 12/15/2020] [Indexed: 06/12/2023]
Abstract
The chloride component of NaCl salinity causes the leaf apoplast to transiently alkalinize. This transition in pH reduces stomatal aperture. However, whether this apoplastic pH (pHapo) transient initiates stomatal closure by interacting with other chloride stress-induced responses or whether the pH transient alone initiates stomatal closure is unknown. To clarify the problem, the transient alkalinization of the leaf apoplast was mimicked in intact maize (Zea mays L.) by infiltrating near-neutral pH buffers into the leaf apoplast. Effects of the pHapo transient could thus be investigated independently from other chloride stress-derived effects. Microscopy-based ratiometric live pHapo imaging was used to monitor pHapoin planta. LC-MS/MS and real-time quantitative reverse transcription-PCR leaf analyses showed that the artificially induced pHapo transient led to an increase in the concentrations of the stomata-regulating plant hormone abscisic acid (ABA) and in transcripts of the key ABA-synthesizing gene ZmVp14 in the leaf. Since stomatal aperture and stomatal conductance decreased according to pHapo, we conclude that the pHapo transient alone initiates stomatal closure. Therefore, the functionality does not depend on interactions with other compounds induced by chloride stress. Overall, our data indicate that the pH of the leaf apoplast links chloride salinity with the control of stomatal aperture via effects exerted on the transcription of ABA.
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Affiliation(s)
- Christoph-Martin Geilfus
- Division of Controlled Environment Horticulture, Albrecht Daniel Thaer-Institute of Agricultural and Horticultural Sciences, Humboldt-University of Berlin, Albrecht-Thaer-Weg, Berlin, Germany
| | - Xudong Zhang
- Institute of Crop Science, Quality of Plant Products, University Hohenheim, Schloss, Westhof-West, Stuttgart, Germany
| | - Axel Mithöfer
- Max Planck Institute for Chemical Ecology, Research Group Plant Defense Physiology, Hans-Knöll-Straße, Jena, Germany
| | - Lisa Burgel
- Institute of Crop Science, Quality of Plant Products, University Hohenheim, Schloss, Westhof-West, Stuttgart, Germany
| | - Gyöngyi Bárdos
- Institute of Crop Science, Quality of Plant Products, University Hohenheim, Schloss, Westhof-West, Stuttgart, Germany
| | - Christian Zörb
- Institute of Crop Science, Quality of Plant Products, University Hohenheim, Schloss, Westhof-West, Stuttgart, Germany
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Nie G, Liu X, Zhou X, Song Q, Fu M, Xu F, Wang X. Functional analysis of a novel cryptochrome gene ( GbCRY1) from Ginkgo biloba. PLANT SIGNALING & BEHAVIOR 2021; 16:1850627. [PMID: 33258712 PMCID: PMC7849775 DOI: 10.1080/15592324.2020.1850627] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 11/09/2020] [Accepted: 11/10/2020] [Indexed: 06/12/2023]
Abstract
Cryptochrome (CRY) is a blue light receptor that is widely distributed in animals, plants, and microorganisms. CRY as a coding gene of cryptochrome that regulates the organism gene expression and plays an important role in organism growth and development. In this study, we identified four photolyase/cryptochrome (PHR/CRY) members from the genome of Ginkgo biloba. Phylogenetic tree analysis showed that the Ginkgo PHR/CRY family members were closely related to Arabidopsis thaliana and Solanum lycopersicum. We isolated a cryptochrome gene, GbCRY1, from G. biloba and analyzed its structure and function. GbCRY1 shared high similarity with AtCRY1 from A. thaliana. GbCRY1 expression level was higher in stems and leaves and lower in roots, male strobili, female strobili. GbCRY1 expression level fluctuated periodically within 24 h, gradually increased in the dark, and decreased under blue light. The newly germinated ginkgo seedlings were cultured under dark, white light, and blue light conditions. The blue light normally induced photomorphogenesis of ginkgo seedlings, which included hypocotyl elongation inhibition, leaf expansion inhibition, and chlorophyll formation. Treating dark-adapted ginkgo leaves with blue light could induce stomatal opening. At the same time, blue light reduced the expression level of GbCRY1 in the process of inducing photomorphogenesis and stoma opening. Our results provide evidence that GbCRY1 expression is affected by space, circadian cycle and light, and also proves that GbCRY1 is related to ginkgo circadian clock, photomorphogenesis and stoma opening process.
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Affiliation(s)
- Gongping Nie
- College of Horticulture and Gardening, Yangtze University, Jingzhou, Hubei, China
| | - Xiaomeng Liu
- College of Horticulture and Gardening, Yangtze University, Jingzhou, Hubei, China
| | - Xian Zhou
- College of Horticulture and Gardening, Yangtze University, Jingzhou, Hubei, China
| | - Qiling Song
- College of Horticulture and Gardening, Yangtze University, Jingzhou, Hubei, China
| | - Mingyue Fu
- College of Horticulture and Gardening, Yangtze University, Jingzhou, Hubei, China
| | - Feng Xu
- College of Horticulture and Gardening, Yangtze University, Jingzhou, Hubei, China
| | - Xuefeng Wang
- College of Art, Yangtze University, Jingzhou, Hubei, China
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11
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Inoue S, Kaiserli E, Zhao X, Waksman T, Takemiya A, Okumura M, Takahashi H, Seki M, Shinozaki K, Endo Y, Sawasaki T, Kinoshita T, Zhang X, Christie JM, Shimazaki K. CIPK23 regulates blue light-dependent stomatal opening in Arabidopsis thaliana. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 104:679-692. [PMID: 32780529 PMCID: PMC7693358 DOI: 10.1111/tpj.14955] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 07/11/2020] [Accepted: 07/21/2020] [Indexed: 05/23/2023]
Abstract
Phototropins (phot1 and phot2) are plant blue light receptor kinases that function to mediate phototropism, chloroplast movement, leaf flattening, and stomatal opening in Arabidopsis. Considerable progress has been made in understanding the mechanisms associated with phototropin receptor activation by light. However, the identities of phototropin signaling components are less well understood by comparison. In this study, we specifically searched for protein kinases that interact with phototropins by using an in vitro screening method (AlphaScreen) to profile interactions against an Arabidopsis protein kinase library. We found that CBL-interacting protein kinase 23 (CIPK23) interacts with both phot1 and phot2. Although these interactions were verified by in vitro pull-down and in vivo bimolecular fluorescence complementation assays, CIPK23 was not phosphorylated by phot1, as least in vitro. Mutants lacking CIPK23 were found to exhibit impaired stomatal opening in response to blue light but no deficits in other phototropin-mediated responses. We further found that blue light activation of inward-rectifying K+ (K+ in ) channels was impaired in the guard cells of cipk23 mutants, whereas activation of the plasma membrane H+ -ATPase was not. The blue light activation of K+ in channels was also impaired in the mutant of BLUS1, which is one of the phototropin substrates in guard cells. We therefore conclude that CIPK23 promotes stomatal opening through activation of K+ in channels most likely in concert with BLUS1, but through a mechanism other than activation of the H+ -ATPase. The role of CIPK23 as a newly identified component of phototropin signaling in stomatal guard cells is discussed.
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Affiliation(s)
- Shin‐Ichiro Inoue
- Division of Biological ScienceGraduate School of ScienceNagoya UniversityFuro‐cho, Chikusa‐kuNagoya464‐8602Japan
| | - Eirini Kaiserli
- Institute of Molecular Cell and Systems BiologyCollege of Medical, Veterinary and Life SciencesUniversity of GlasgowGlasgowG12 8QQUK
| | - Xiang Zhao
- Institute of Plant Stress BiologyState Key Laboratory of Cotton BiologySchool of Life SciencesHenan UniversityKaifeng475004People’s Republic of China
| | - Thomas Waksman
- Institute of Molecular Cell and Systems BiologyCollege of Medical, Veterinary and Life SciencesUniversity of GlasgowGlasgowG12 8QQUK
| | - Atsushi Takemiya
- Department of BiologyFaculty of ScienceKyushu University744 MotookaFukuoka819‐0395Japan
- Present address:
Department of BiologyGraduate School of Sciences and Technology for InnovationYamaguchi UniversityYamaguchi753‐8512Japan
| | - Masaki Okumura
- Division of Biological ScienceGraduate School of ScienceNagoya UniversityFuro‐cho, Chikusa‐kuNagoya464‐8602Japan
- Present address:
Department of Plant and Microbial BiologyUniversity of Minnesota
| | | | - Motoaki Seki
- RIKEN Cluster for Pioneering Research2‐1 HirosawaWako351‐0198Japan
- RIKEN Center for Sustainable Resource Science1‐7‐22, Suehiro, Tsurumi‐kuYokohama230‐0045Japan
| | - Kazuo Shinozaki
- Gene Discovery Research GroupRIKEN Center for Sustainable Resource Science3‐1‐1 KoyadaiTsukuba305‐0074Japan
| | - Yaeta Endo
- Institute for the Promotion of Science and TechnologyEhime UniversityMatsuyama790‐8577Japan
| | | | - Toshinori Kinoshita
- Institute of Transformative Bio‐Molecules (WPI‐ITbM)Nagoya UniversityChikusaNagoya464‐8602Japan
| | - Xiao Zhang
- Institute of Plant Stress BiologyState Key Laboratory of Cotton BiologySchool of Life SciencesHenan UniversityKaifeng475004People’s Republic of China
| | - John M. Christie
- Institute of Molecular Cell and Systems BiologyCollege of Medical, Veterinary and Life SciencesUniversity of GlasgowGlasgowG12 8QQUK
| | - Ken‐Ichiro Shimazaki
- Department of BiologyFaculty of ScienceKyushu University744 MotookaFukuoka819‐0395Japan
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12
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Lefoulon C, Boxall SF, Hartwell J, Blatt MR. Crassulacean acid metabolism guard cell anion channel activity follows transcript abundance and is suppressed by apoplastic malate. THE NEW PHYTOLOGIST 2020; 227:1847-1857. [PMID: 32367511 DOI: 10.1111/nph.16640] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Accepted: 04/22/2020] [Indexed: 06/11/2023]
Abstract
Plants utilising crassulacean acid metabolism (CAM) concentrate CO2 around RuBisCO while reducing transpirational water loss associated with photosynthesis. Unlike stomata of C3 and C4 species, CAM stomata open at night for the mesophyll to fix CO2 into malate (Mal) and store it in the vacuole. CAM plants decarboxylate Mal in the light, generating high CO2 concentrations within the leaf behind closed stomata for refixation by RuBisCO. CO2 may contribute to stomatal closure but additional mechanisms, plausibly including Mal activation of anion channels, ensure closure in the light. In the CAM species Kalanchoë fedtschenkoi, we found that guard cell anion channel activity, recorded under voltage clamp, follows KfSLAC1 and KfALMT12 transcript abundance, declining to near zero by the end of the light period. Unexpectedly, however, we found that extracellular Mal inhibited the anion current of Kalanchoë guard cells, both in wild-type and RNAi mutants with impaired Mal metabolism. We conclude that the diurnal cycle of anion channel gene transcription, rather than the physiological signal of Mal release, is a key factor in the inverted CAM stomatal cycle.
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Affiliation(s)
- Cécile Lefoulon
- Laboratory of Plant Physiology and Biophysics, University of Glasgow, Bower Building, Glasgow, G12 8QQ, UK
| | - Susanna F Boxall
- Department of Functional and Comparative Genomics, Institute of Integrative Biology, University of Liverpool, Biosciences Building, Crown Street, Liverpool,, L69 7ZB, UK
| | - James Hartwell
- Department of Functional and Comparative Genomics, Institute of Integrative Biology, University of Liverpool, Biosciences Building, Crown Street, Liverpool,, L69 7ZB, UK
| | - Michael R Blatt
- Laboratory of Plant Physiology and Biophysics, University of Glasgow, Bower Building, Glasgow, G12 8QQ, UK
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13
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Hayashi M, Sugimoto H, Takahashi H, Seki M, Shinozaki K, Sawasaki T, Kinoshita T, Inoue SI. Raf-like kinases CBC1 and CBC2 negatively regulate stomatal opening by negatively regulating plasma membrane H +-ATPase phosphorylation in Arabidopsis. Photochem Photobiol Sci 2020; 19:88-98. [PMID: 31904040 DOI: 10.1039/c9pp00329k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Stomatal pores, which are surrounded by pairs of guard cells in the plant epidermis, regulate gas exchange between plants and the atmosphere, thereby controlling photosynthesis and transpiration. Blue light works as a signal to guard cells, to induce intracellular signaling and open stomata. Blue light receptor phototropins (phots) are activated by blue light; phot-mediated signals promote plasma membrane (PM) H+-ATPase activity via C-terminal Thr phosphorylation, serving as the driving force for stomatal opening in guard cells. However, the details of this signaling process are not fully understood. In this study, through an in vitro screening of phot-interacting protein kinases, we obtained the CBC1 and CBC2 that had been reported as signal transducers in stomatal opening. Promoter activities of CBC1 and CBC2 indicated that both genes were expressed in guard cells. Single and double knockout mutants of CBC1 and CBC2 showed no lesions in the context of phot-mediated phototropism, chloroplast movement, or leaf flattening. In contrast, the cbc1cbc2 double mutant showed larger stomatal opening under both dark and blue light conditions. Interestingly, the level of phosphorylation of C-terminal Thr of PM H+-ATPase was higher in double mutant guard cells. The larger stomatal openings of the double mutant were effectively suppressed by the phytohormone abscisic acid (ABA). CBC1 and CBC2 interacted with BLUS1 and PM H+-ATPase in vitro. From these results, we conclude that CBC1 and CBC2 act as negative regulators of stomatal opening, probably via inhibition of PM H+-ATPase activity.
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Affiliation(s)
- Maki Hayashi
- Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa, Nagoya, 464-8602, Japan
| | - Hodaka Sugimoto
- Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa, Nagoya, 464-8602, Japan
| | - Hirotaka Takahashi
- Proteo-Science Center (PROS), Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime, 790-8577, Japan
| | - Motoaki Seki
- RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.,RIKEN Center for Sustainable Resource Science, 1-7-22, Suehiro, Tsurumi-ku, Yokohama, Kanagawa, 230-0045, Japan
| | - Kazuo Shinozaki
- Gene Discovery Research Group, RIKEN Center for Sustainable Resource Science, 3-1-1 Koyadai, Tsukuba, Ibaraki, 305-0074, Japan
| | - Tatsuya Sawasaki
- Proteo-Science Center (PROS), Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime, 790-8577, Japan
| | - Toshinori Kinoshita
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Chikusa, Nagoya, 464-8602, Japan
| | - Shin-Ichiro Inoue
- Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa, Nagoya, 464-8602, Japan.
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14
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Zhang J, De-Oliveira-Ceciliato P, Takahashi Y, Schulze S, Dubeaux G, Hauser F, Azoulay-Shemer T, Tõldsepp K, Kollist H, Rappel WJ, Schroeder JI. Insights into the Molecular Mechanisms of CO 2-Mediated Regulation of Stomatal Movements. Curr Biol 2019; 28:R1356-R1363. [PMID: 30513335 DOI: 10.1016/j.cub.2018.10.015] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Plants must continually balance the influx of CO2 for photosynthesis against the loss of water vapor through stomatal pores in their leaves. This balance can be achieved by controlling the aperture of the stomatal pores in response to several environmental stimuli. Elevation in atmospheric [CO2] induces stomatal closure and further impacts leaf temperatures, plant growth and water-use efficiency, and global crop productivity. Here, we review recent advances in understanding CO2-perception mechanisms and CO2-mediated signal transduction in the regulation of stomatal movements, and we explore how these mechanisms are integrated with other signaling pathways in guard cells.
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Affiliation(s)
- Jingbo Zhang
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, CA 92093, USA
| | - Paulo De-Oliveira-Ceciliato
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, CA 92093, USA
| | - Yohei Takahashi
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, CA 92093, USA
| | - Sebastian Schulze
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, CA 92093, USA
| | - Guillaume Dubeaux
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, CA 92093, USA
| | - Felix Hauser
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, CA 92093, USA
| | - Tamar Azoulay-Shemer
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, CA 92093, USA
| | - Kadri Tõldsepp
- Institute of Technology, University of Tartu, Tartu 50411, Estonia
| | - Hannes Kollist
- Institute of Technology, University of Tartu, Tartu 50411, Estonia
| | - Wouter-Jan Rappel
- Physics Department, University of California San Diego, La Jolla, CA 92093, USA
| | - Julian I Schroeder
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla, CA 92093, USA.
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15
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Lin YJ, Chen YC, Tseng KC, Chang WC, Ko SS. Phototropins Mediate Chloroplast Movement in Phalaenopsis aphrodite (Moth Orchid). PLANT & CELL PHYSIOLOGY 2019; 60:2243-2254. [PMID: 31198960 DOI: 10.1093/pcp/pcz116] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Accepted: 06/10/2019] [Indexed: 06/09/2023]
Abstract
Chloroplast movement is important for plants to avoid photodamage and to perform efficient photosynthesis. Phototropins are blue light receptors in plants that function in chloroplast movement, phototropism, stomatal opening, and they also affect plant growth and development. In this study, full-length cDNAs of two PHOTOTROPIN genes, PaPHOT1 and PaPHOT2, were cloned from a moth orchid Phalaenopsis aphrodite, and their functions in chloroplast movement were investigated. Phylogenetic analysis showed that PaPHOT1 and PaPHOT2 orthologs were highly similar to PHOT1 and PHOT2 of the close relative Phalaenopsis equestris, respectively, and clustered with monocots PHOT1 and PHOT2 orthologs, respectively. Phalaenopsis aphrodite expressed a moderate level of PaPHOT1 under low blue light of 5 μmol�m-2�s-1 (BL5) and a high levels of PaPHOT1 at >BL100. However, PaPHOT2 was expressed at low levels at <BL50 but expressed at high levels at > BL100. Analysis of light-induced chloroplast movements using the SPAD method indicated that orchid accumulated chloroplasts at <BL10. The chloroplast avoidance response was detectable at >BL25 and significant chloroplast avoidance movement was observed at >BL100. Virus-induced gene silencing of PaPHOTs in orchids showed decreased gene expression of PaPHOTs and reduced both chloroplast accumulation and avoidance responses. Heterologous expression of PaPHOT1 in Arabidopsis phot1phot2 double mutant recovered chloroplast accumulation response at BL5, but neither PaPHOT1 nor PaPHOT2 was able to restore mutant chloroplast avoidance at BL100. Overall, this study showed that phototropins mediate chloroplast movement in Phalaenopsis orchid is blue light-dependent but their function is slightly different from Arabidopsis which might be due to gene evolution.
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Affiliation(s)
- Yi-Jyun Lin
- Academia Sinica Biotechnology Center in Southern Taiwan, Tainan, Taiwan
| | - Yu-Chung Chen
- Academia Sinica Biotechnology Center in Southern Taiwan, Tainan, Taiwan
- Institute of Tropical Plant Sciences, National Cheng Kung University, Tainan, Taiwan
| | - Kuan-Chieh Tseng
- Department of Life Sciences, National Cheng Kung University, Tainan, Taiwan
| | - Wen-Chi Chang
- Institute of Tropical Plant Sciences, National Cheng Kung University, Tainan, Taiwan
- Department of Life Sciences, National Cheng Kung University, Tainan, Taiwan
| | - Swee-Suak Ko
- Academia Sinica Biotechnology Center in Southern Taiwan, Tainan, Taiwan
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
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16
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Sussmilch FC, Schultz J, Hedrich R, Roelfsema MRG. Acquiring Control: The Evolution of Stomatal Signalling Pathways. TRENDS IN PLANT SCIENCE 2019; 24:342-351. [PMID: 30797685 DOI: 10.1016/j.tplants.2019.01.002] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 01/02/2019] [Accepted: 01/10/2019] [Indexed: 05/24/2023]
Abstract
In vascular plants, stomata balance two opposing functions: they open to facilitate CO2 uptake and close to prevent excessive water loss. Here, we discuss the evolution of three major signalling pathways that are known to control stomatal movements in angiosperms in response to light, CO2, and abscisic acid (ABA). We examine the evolutionary origins of key signalling genes involved in these pathways, and compare their expression patterns between an angiosperm and moss. We propose that variation in stomatal sensitivity to stimuli between plant groups are rooted in differences in: (i) gene presence/absence, (ii) specificity of gene spatial expression pattern, and (iii) protein characteristics and functional interactions.
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Affiliation(s)
- Frances C Sussmilch
- Institute for Molecular Plant Physiology and Biophysics, University of Würzburg, D-97082 Würzburg, Germany
| | - Jörg Schultz
- Center for Computational and Theoretical Biology, University of Würzburg, D-97218 Würzburg, Germany
| | - Rainer Hedrich
- Institute for Molecular Plant Physiology and Biophysics, University of Würzburg, D-97082 Würzburg, Germany
| | - M Rob G Roelfsema
- Institute for Molecular Plant Physiology and Biophysics, University of Würzburg, D-97082 Würzburg, Germany.
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17
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Hedrich R, Shabala S. Stomata in a saline world. CURRENT OPINION IN PLANT BIOLOGY 2018; 46:87-95. [PMID: 30138845 DOI: 10.1016/j.pbi.2018.07.015] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Revised: 07/18/2018] [Accepted: 07/25/2018] [Indexed: 05/20/2023]
Abstract
Salt stress results in a dramatic increase in ABA biosynthesis, H2O2 accumulation, and reduced K+ availability in the shoot. Each of these factors leads to stomata closure, so reducing CO2 assimilation and imposing yield penalties. However, halophytes, naturally salt tolerant plant species, flourish under saline conditions that would cause massive yield penalties in glycophytic crops. Is there anything special about the stomata of halophytes, why is guard cell function in these salt tolerant species not affected by the above factors? This opinion paper addresses these questions by providing a comprehensive assessment of the molecular identity and operational modes of major plasma membrane transporters that mediate stomata movements.
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Affiliation(s)
- Rainer Hedrich
- Institute for Molecular Plant Physiology and Biophysics, University Wuerzburg, D-97070 Wuerzburg, Germany; Tasmanian Institute of Agriculture, College of Science and Engineering, University of Tasmania, Hobart, Tas 7001, Australia.
| | - Sergey Shabala
- Tasmanian Institute of Agriculture, College of Science and Engineering, University of Tasmania, Hobart, Tas 7001, Australia; Department of Horticulture, Foshan University, Foshan 528000, China.
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18
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Voss LJ, McAdam SAM, Knoblauch M, Rathje JM, Brodribb T, Hedrich R, Roelfsema MRG. Guard cells in fern stomata are connected by plasmodesmata, but control cytosolic Ca 2+ levels autonomously. THE NEW PHYTOLOGIST 2018; 219:206-215. [PMID: 29655174 DOI: 10.1111/nph.15153] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 03/06/2018] [Indexed: 05/10/2023]
Abstract
Recent studies have revealed that some responses of fern stomata to environmental signals differ from those of their relatives in seed plants. However, it is unknown whether the biophysical properties of guard cells differ fundamentally between species of both clades. Intracellular micro-electrodes and the fluorescent Ca2+ reporter FURA2 were used to study voltage-dependent cation channels and Ca2+ signals in guard cells of the ferns Polypodium vulgare and Asplenium scolopendrium. Voltage clamp experiments with fern guard cells revealed similar properties of voltage-dependent K+ channels as found in seed plants. However, fluorescent dyes moved within the fern stomata, from one guard cell to the other, which does not occur in most seed plants. Despite the presence of plasmodesmata, which interconnect fern guard cells, Ca2+ signals could be elicited in each of the cells individually. Based on the common properties of voltage-dependent channels in ferns and seed plants, it is likely that these key transport proteins are conserved in vascular plants. However, the symplastic connections between fern guard cells in mature stomata indicate that the biophysical mechanisms that control stomatal movements differ between ferns and seed plants.
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Affiliation(s)
- Lena J Voss
- Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute for Biosciences, Biocenter, Würzburg University, Julius-von-Sachs-Platz 2, D-97082, Würzburg, Germany
| | - Scott A M McAdam
- School of Biological Science, University of Tasmania, Hobart, TAS, 7001, Australia
- Botany and Plant Pathology, Purdue University, 915 West State Street, West Lafayette, IN, 47907, USA
| | - Michael Knoblauch
- School of Biological Sciences, Washington State University, PO Box 644236, Pullman, WA, 99164-4236, USA
| | - Jan M Rathje
- Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute for Biosciences, Biocenter, Würzburg University, Julius-von-Sachs-Platz 2, D-97082, Würzburg, Germany
| | - Tim Brodribb
- School of Biological Science, University of Tasmania, Hobart, TAS, 7001, Australia
| | - Rainer Hedrich
- Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute for Biosciences, Biocenter, Würzburg University, Julius-von-Sachs-Platz 2, D-97082, Würzburg, Germany
| | - M Rob G Roelfsema
- Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute for Biosciences, Biocenter, Würzburg University, Julius-von-Sachs-Platz 2, D-97082, Würzburg, Germany
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19
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Hiyama A, Takemiya A, Munemasa S, Okuma E, Sugiyama N, Tada Y, Murata Y, Shimazaki KI. Blue light and CO 2 signals converge to regulate light-induced stomatal opening. Nat Commun 2017; 8:1284. [PMID: 29101334 PMCID: PMC5670223 DOI: 10.1038/s41467-017-01237-5] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Accepted: 08/31/2017] [Indexed: 01/08/2023] Open
Abstract
Stomata regulate gas exchange between plants and atmosphere by integrating opening and closing signals. Stomata open in response to low CO2 concentrations to maximize photosynthesis in the light; however, the mechanisms that coordinate photosynthesis and stomatal conductance have yet to be identified. Here we identify and characterize CBC1/2 (CONVERGENCE OF BLUE LIGHT (BL) AND CO2 1/2), two kinases that link BL, a major component of photosynthetically active radiation (PAR), and the signals from low concentrations of CO2 in guard cells. CBC1/CBC2 redundantly stimulate stomatal opening by inhibition of S-type anion channels in response to both BL and low concentrations of CO2. CBC1/CBC2 function in the signaling pathways of phototropins and HT1 (HIGH LEAF TEMPERATURE 1). CBC1/CBC2 interact with and are phosphorylated by HT1. We propose that CBCs regulate stomatal aperture by integrating signals from BL and CO2 and act as the convergence site for signals from BL and low CO2. Stomata open in response to low CO2 conditions in the light to maximise photosynthesis. Here, Hiyama et al. identify two kinases that promote stomatal opening by inhibiting S-type anion channels downstream of phototropin and HT1 thereby acting as a convergence point for blue light and CO2 signaling.
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Affiliation(s)
- Asami Hiyama
- Department of Biology, Faculty of Science, Kyushu University, 744 Motooka, Fukuoka, 819-0395, Japan
| | - Atsushi Takemiya
- Department of Biology, Faculty of Science, Kyushu University, 744 Motooka, Fukuoka, 819-0395, Japan.,Graduate School of Sciences and Technology for Innovation, 1677-1 Yoshida, Yamaguchi, 753-8512, Japan
| | - Shintaro Munemasa
- Graduate School of Environmental and Life Science, Okayama University, Okayama, 700-8530, Japan
| | - Eiji Okuma
- Graduate School of Environmental and Life Science, Okayama University, Okayama, 700-8530, Japan
| | - Naoyuki Sugiyama
- Department of Molecular & Cellular BioAnalysis, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Yasuomi Tada
- Center for Gene Research, Nagoya University, Chikusa, Nagoya, 464-8602, Japan
| | - Yoshiyuki Murata
- Graduate School of Environmental and Life Science, Okayama University, Okayama, 700-8530, Japan
| | - Ken-Ichiro Shimazaki
- Department of Biology, Faculty of Science, Kyushu University, 744 Motooka, Fukuoka, 819-0395, Japan.
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20
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Müller HM, Schäfer N, Bauer H, Geiger D, Lautner S, Fromm J, Riederer M, Bueno A, Nussbaumer T, Mayer K, Alquraishi SA, Alfarhan AH, Neher E, Al-Rasheid KAS, Ache P, Hedrich R. The desert plant Phoenix dactylifera closes stomata via nitrate-regulated SLAC1 anion channel. THE NEW PHYTOLOGIST 2017; 216:150-162. [PMID: 28670699 DOI: 10.1111/nph.14672] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 05/17/2017] [Indexed: 05/22/2023]
Abstract
Date palm Phoenix dactylifera is a desert crop well adapted to survive and produce fruits under extreme drought and heat. How are palms under such harsh environmental conditions able to limit transpirational water loss? Here, we analysed the cuticular waxes, stomata structure and function, and molecular biology of guard cells from P. dactylifera. To understand the stomatal response to the water stress phytohormone of the desert plant, we cloned the major elements necessary for guard cell fast abscisic acid (ABA) signalling and reconstituted this ABA signalosome in Xenopus oocytes. The PhoenixSLAC1-type anion channel is regulated by ABA kinase PdOST1. Energy-dispersive X-ray analysis (EDXA) demonstrated that date palm guard cells release chloride during stomatal closure. However, in Cl- medium, PdOST1 did not activate the desert plant anion channel PdSLAC1 per se. Only when nitrate was present at the extracellular face of the anion channel did the OST1-gated PdSLAC1 open, thus enabling chloride release. In the presence of nitrate, ABA enhanced and accelerated stomatal closure. Our findings indicate that, in date palm, the guard cell osmotic motor driving stomatal closure uses nitrate as the signal to open the major anion channel SLAC1. This initiates guard cell depolarization and the release of anions together with potassium.
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Affiliation(s)
- Heike M Müller
- Biocenter, Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, University of Wuerzburg, 97082, Wuerzburg, Germany
| | - Nadine Schäfer
- Biocenter, Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, University of Wuerzburg, 97082, Wuerzburg, Germany
| | - Hubert Bauer
- Biocenter, Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, University of Wuerzburg, 97082, Wuerzburg, Germany
| | - Dietmar Geiger
- Biocenter, Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, University of Wuerzburg, 97082, Wuerzburg, Germany
| | - Silke Lautner
- Department of Wood Science, University Hamburg, 21031, Hamburg, Germany
| | - Jörg Fromm
- Department of Wood Science, University Hamburg, 21031, Hamburg, Germany
| | - Markus Riederer
- Biocenter, Institute for Ecophysiology and Vegetation Ecology, Julius-von-Sachs-Institute, University of Wuerzburg, 97082, Wuerzburg, Germany
| | - Amauri Bueno
- Biocenter, Institute for Ecophysiology and Vegetation Ecology, Julius-von-Sachs-Institute, University of Wuerzburg, 97082, Wuerzburg, Germany
| | - Thomas Nussbaumer
- Plant Genome and Systems Biology, Helmholtz Center Munich, D-85764, Neuherberg, Germany
| | - Klaus Mayer
- Plant Genome and Systems Biology, Helmholtz Center Munich, D-85764, Neuherberg, Germany
| | | | - Ahmed H Alfarhan
- College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Erwin Neher
- Department for Membrane Biophysics, Max Planck Institute for Biophysical Chemistry, D-37077, Goettingen, Germany
| | - Khaled A S Al-Rasheid
- Biocenter, Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, University of Wuerzburg, 97082, Wuerzburg, Germany
- College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Peter Ache
- Biocenter, Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, University of Wuerzburg, 97082, Wuerzburg, Germany
| | - Rainer Hedrich
- Biocenter, Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, University of Wuerzburg, 97082, Wuerzburg, Germany
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21
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Hedrich R, Geiger D. Biology of SLAC1-type anion channels - from nutrient uptake to stomatal closure. THE NEW PHYTOLOGIST 2017; 216:46-61. [PMID: 28722226 DOI: 10.1111/nph.14685] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 04/25/2017] [Indexed: 05/22/2023]
Abstract
Contents 46 I. 46 II. 47 III. 50 IV. 53 V. 56 VI. 57 58 58 References 58 SUMMARY: Stomatal guard cells control leaf CO2 intake and concomitant water loss to the atmosphere. When photosynthetic CO2 assimilation is limited and the ratio of CO2 intake to transpiration becomes suboptimal, guard cells, sensing the rise in CO2 concentration in the substomatal cavity, deflate and the stomata close. Screens for mutants that do not close in response to experimentally imposed high CO2 atmospheres identified the guard cell-expressed Slowly activating anion channel, SLAC1, as the key player in the regulation of stomatal closure. SLAC1 evolved, though, before the emergence of guard cells. In Arabidopsis, SLAC1 is the founder member of a family of anion channels, which comprises four homologues. SLAC1 and SLAH3 mediate chloride and nitrate transport in guard cells, while SLAH1, SLAH2 and SLAH3 are engaged in root nitrate and chloride acquisition, and anion translocation to the shoot. The signal transduction pathways involved in CO2 , water stress and nutrient-sensing activate SLAC/SLAH via distinct protein kinase/phosphatase pairs. In this review, we discuss the role that SLAC/SLAH channels play in guard cell closure, on the one hand, and in the root-shoot continuum on the other, along with the molecular basis of the channels' anion selectivity and gating.
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Affiliation(s)
- Rainer Hedrich
- Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, Biocenter, University of Wuerzburg, Wuerzburg, 97082, Germany
| | - Dietmar Geiger
- Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, Biocenter, University of Wuerzburg, Wuerzburg, 97082, Germany
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23
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Matrosova A, Bogireddi H, Mateo-Peñas A, Hashimoto-Sugimoto M, Iba K, Schroeder JI, Israelsson-Nordström M. The HT1 protein kinase is essential for red light-induced stomatal opening and genetically interacts with OST1 in red light and CO2 -induced stomatal movement responses. THE NEW PHYTOLOGIST 2015; 208:1126-37. [PMID: 26192339 DOI: 10.1111/nph.13566] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Accepted: 06/11/2015] [Indexed: 05/26/2023]
Abstract
The question of whether red light-induced stomatal opening is mediated by a photosynthesis-derived reduction in intercellular [CO2 ] (Ci ) remains controversial and genetic analyses are needed. The Arabidopsis thaliana protein kinase HIGH TEMPERATURE 1 (HT1) is a negative regulator of [CO2 ]-induced stomatal closing and ht1-2 mutant plants do not show stomatal opening to low [CO2 ]. The protein kinase mutant ost1-3 exhibits slowed stomatal responses to CO2 . The functions of HT1 and OPEN STOMATA 1 (OST1) to changes in red, blue light or [CO2 ] were analyzed. For comparison we assayed recessive ca1ca4 carbonic anhydrase double mutant plants, based on their slowed stomatal response to CO2 . Here, we report a strong impairment in ht1 in red light-induced stomatal opening whereas blue light was able to induce stomatal opening. The effects on photosynthetic performance in ht1 were restored when stomatal limitation of CO2 uptake, by control of [Ci ], was eliminated. HT1 was found to interact genetically with OST1 both during red light- and low [CO2 ]-induced stomatal opening. Analyses of ca1ca4 plants suggest that more than a low [Ci ]-dependent pathway may function in red light-induced stomatal opening. These results demonstrate that HT1 is essential for red light-induced stomatal opening and interacts genetically with OST1 during stomatal responses to red light and altered [CO2 ].
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Affiliation(s)
- Anastasia Matrosova
- Umeå Plant Science Center, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83, Umeå, Sweden
| | - Hanumakumar Bogireddi
- Umeå Plant Science Center, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83, Umeå, Sweden
| | - Alfonso Mateo-Peñas
- Umeå Plant Science Center, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83, Umeå, Sweden
| | | | - Koh Iba
- Department of Biology, Faculty of Sciences, Kyushu University, Fukuoka, 812-8581, Japan
| | - Julian I Schroeder
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California, San Diego, La Jolla, CA, 92093-0116, USA
| | - Maria Israelsson-Nordström
- Umeå Plant Science Center, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83, Umeå, Sweden
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Creese C, Oberbauer S, Rundel P, Sack L. Are fern stomatal responses to different stimuli coordinated? Testing responses to light, vapor pressure deficit, and CO2 for diverse species grown under contrasting irradiances. THE NEW PHYTOLOGIST 2014; 204:92-104. [PMID: 25077933 DOI: 10.1111/nph.12922] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2014] [Accepted: 05/17/2014] [Indexed: 05/10/2023]
Abstract
The stomatal behavior of ferns provides an excellent system for disentangling responses to different environmental signals, which balance carbon gain against water loss. Here, we measured responses of stomatal conductance (gs ) to irradiance, CO2 , and vapor pressure deficit (VPD) for 13 phylogenetically diverse species native to open and shaded habitats, grown under high- and low-irradiance treatments. We tested two main hypotheses: that plants adapted and grown in high-irradiance environments would have greater responsiveness to all stimuli given higher flux rates; and that species' responsiveness to different factors would be correlated because of the relative simplicity of fern stomatal control. We found that species with higher light-saturated gs had larger responses, and that plants grown under high irradiance were more responsive to all stimuli. Open habitat species showed greater responsiveness to irradiance and CO2 , but lower responsiveness to VPD; a case of plasticity and adaptation tending in different directions. Responses of gs to irradiance and VPD were positively correlated across species, but CO2 responses were independent and highly variable. The novel finding of correlations among stomatal responses to different stimuli suggests coordination of hydraulic and photosynthetic signaling networks modulating fern stomatal responses, which show distinct optimization at growth and evolutionary time-scales.
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Affiliation(s)
- Chris Creese
- Department of Ecology and Evolutionary Biology, University of California Los Angeles, 621 Charles E. Young Drive South, Box 951606, Los Angeles, CA, 90095-1606, USA
| | - Steve Oberbauer
- Department of Biological Sciences, Florida International University, Miami, FL, 33199, USA
| | - Phil Rundel
- Department of Ecology and Evolutionary Biology, University of California Los Angeles, 621 Charles E. Young Drive South, Box 951606, Los Angeles, CA, 90095-1606, USA
| | - Lawren Sack
- Department of Ecology and Evolutionary Biology, University of California Los Angeles, 621 Charles E. Young Drive South, Box 951606, Los Angeles, CA, 90095-1606, USA
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Suetsugu N, Takami T, Ebisu Y, Watanabe H, Iiboshi C, Doi M, Shimazaki KI. Guard cell chloroplasts are essential for blue light-dependent stomatal opening in Arabidopsis. PLoS One 2014; 9:e108374. [PMID: 25250952 PMCID: PMC4177113 DOI: 10.1371/journal.pone.0108374] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Accepted: 08/20/2014] [Indexed: 01/13/2023] Open
Abstract
Blue light (BL) induces stomatal opening through the activation of H+-ATPases with subsequent ion accumulation in guard cells. In most plant species, red light (RL) enhances BL-dependent stomatal opening. This RL effect is attributable to the chloroplasts of guard cell, the only cells in the epidermis possessing this organelle. To clarify the role of chloroplasts in stomatal regulation, we investigated the effects of RL on BL-dependent stomatal opening in isolated epidermis, guard cell protoplasts, and intact leaves of Arabidopsis thaliana. In isolated epidermal tissues and intact leaves, weak BL superimposed on RL enhanced stomatal opening while BL alone was less effective. In guard cell protoplasts, RL enhanced BL-dependent H+-pumping and DCMU, a photosynthetic electron transport inhibitor, eliminated this effect. RL enhanced phosphorylation levels of the H+-ATPase in response to BL, but this RL effect was not suppressed by DCMU. Furthermore, DCMU inhibited both RL-induced and BL-dependent stomatal opening in intact leaves. The photosynthetic rate in leaves correlated positively with BL-dependent stomatal opening in the presence of DCMU. We conclude that guard cell chloroplasts provide ATP and/or reducing equivalents that fuel BL-dependent stomatal opening, and that they indirectly monitor photosynthetic CO2 fixation in mesophyll chloroplasts by absorbing PAR in the epidermis.
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Affiliation(s)
- Noriyuki Suetsugu
- Department of Biology, Faculty of Sciences, Kyushu University, Fukuoka, Japan
| | - Tsuneaki Takami
- Department of Biology, Faculty of Sciences, Kyushu University, Fukuoka, Japan
| | - Yuuta Ebisu
- Graduate School of System Life Sciences, Kyushu University, Fukuoka, Japan
| | - Harutaka Watanabe
- Department of Biology, Faculty of Sciences, Kyushu University, Fukuoka, Japan
| | - Chihoko Iiboshi
- Department of Biology, Faculty of Sciences, Kyushu University, Fukuoka, Japan
| | - Michio Doi
- Faculty of Art and Science, Kyushu University, Fukuoka, Japan
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26
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O'Carrigan A, Babla M, Wang F, Liu X, Mak M, Thomas R, Bellotti B, Chen ZH. Analysis of gas exchange, stomatal behaviour and micronutrients uncovers dynamic response and adaptation of tomato plants to monochromatic light treatments. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2014; 82:105-15. [PMID: 24935228 DOI: 10.1016/j.plaphy.2014.05.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Accepted: 05/22/2014] [Indexed: 05/02/2023]
Abstract
Light spectrum affects the yield and quality of greenhouse tomato, especially over a prolonged period of monochromatic light treatments. Physiological and chemical analysis was employed to investigate the influence of light spectral (blue, green and red) changes on growth, photosynthesis, stomatal behaviour, leaf pigment, and micronutrient levels. We found that plants are less affected under blue light treatment, which was evident by the maintenance of higher A, gs, Tr, and stomatal parameters and significantly lower VPD and Tleaf as compared to those plants grown in green and red light treatments. Green and red light treatments led to significantly larger increase in the accumulation of Fe, B, Zn, and Cu than blue light. Moreover, guard cell length, width, and volume all showed highly significant positive correlations to gs, Tr and negative links to VPD. There was negative impact of monochromatic lights-induced accumulation of Mn, Cu, and Zn on photosynthesis, leaf pigments and plant growth. Furthermore, most of the light-induced significant changes of the physiological traits were partially recovered at the end of experiment. A high degree of morphological and physiological plasticity to blue, green and red light treatments suggested that tomato plants may have developed mechanisms to adapt to the light treatments. Thus, understanding the optimization of light spectrum for photosynthesis and growth is one of the key components for greenhouse tomato production.
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Affiliation(s)
- Andrew O'Carrigan
- School of Science and Health, University of Western Sydney, Penrith, 2751, NSW, Australia
| | - Mohammad Babla
- School of Science and Health, University of Western Sydney, Penrith, 2751, NSW, Australia
| | - Feifei Wang
- School of Science and Health, University of Western Sydney, Penrith, 2751, NSW, Australia; School of Agricultural Science, University of Tasmania, Hobart, TAS, 7001, Australia
| | - Xiaohui Liu
- School of Science and Health, University of Western Sydney, Penrith, 2751, NSW, Australia; School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
| | - Michelle Mak
- School of Science and Health, University of Western Sydney, Penrith, 2751, NSW, Australia
| | - Richard Thomas
- School of Science and Health, University of Western Sydney, Penrith, 2751, NSW, Australia
| | - Bill Bellotti
- School of Science and Health, University of Western Sydney, Penrith, 2751, NSW, Australia
| | - Zhong-Hua Chen
- School of Science and Health, University of Western Sydney, Penrith, 2751, NSW, Australia.
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Kollist H, Nuhkat M, Roelfsema MRG. Closing gaps: linking elements that control stomatal movement. THE NEW PHYTOLOGIST 2014; 203:44-62. [PMID: 24800691 DOI: 10.1111/nph.12832] [Citation(s) in RCA: 177] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Accepted: 03/27/2014] [Indexed: 05/18/2023]
Abstract
Stomata are an attractive experimental system in plant biology, because the responses of guard cells to environmental signals can be directly linked to changes in the aperture of stomatal pores. In this review, the mechanics of stomatal movement are discussed in relation to ion transport in guard cells. Emphasis is placed on the ion pumps, transporters, and channels in the plasma membrane, as well as in the vacuolar membrane. The biophysical properties of transport proteins for H(+), K(+), Ca(2+), and anions are discussed and related to their function in guard cells during stomatal movements. Guard cell signaling pathways for ABA, CO2, ozone, microbe-associated molecular patterns (MAMPs) and blue light are presented. Special attention is given to the regulation of the slow anion channel (SLAC) and SLAC homolog (SLAH)-type anion channels by the ABA signalosome. Over the last decade, several knowledge gaps in the regulation of ion transport in guard cells have been closed. The current state of knowledge is an excellent starting point for tackling important open questions concerning stress tolerance in plants.
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Affiliation(s)
- Hannes Kollist
- Institute of Technology, University of Tartu, Nooruse 1, Tartu, 50411, Estonia
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Merilo E, Jõesaar I, Brosché M, Kollist H. To open or to close: species-specific stomatal responses to simultaneously applied opposing environmental factors. THE NEW PHYTOLOGIST 2014; 202:499-508. [PMID: 24392838 DOI: 10.1111/nph.12667] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Accepted: 11/30/2013] [Indexed: 05/07/2023]
Abstract
Plant stomatal responses to single environmental factors are well studied; however, responses to a change in two (or more) factors - a common situation in nature - have been less frequently addressed. We studied the stomatal responses to a simultaneous application of opposing environmental factors in six evolutionarily distant mono- and dicotyledonous herbs representing different life strategies (ruderals, competitors and stress-tolerators) to clarify whether the crosstalk between opening- and closure-inducing pathways leading to stomatal response is universal or species-specific. Custom-made gas exchange devices were used to study the stomatal responses to a simultaneous application of two opposing factors: decreased/increased CO2 concentration and light availability or reduced air humidity. The studied species responded similarly to changes in single environmental factors, but showed species-specific and nonadditive responses to two simultaneously applied opposing factors. The stomata of the ruderals Arabidopsis thaliana and Thellungiella salsuginea (previously Thellungiella halophila) always opened, whereas those of competitor-ruderals either closed in all two-factor combinations (Triticum aestivum), remained relatively unchanged (Nicotiana tabacum) or showed a response dominated by reduced air humidity (Hordeum vulgare). Our results, indicating that in changing environmental conditions species-specific stomatal responses are evident that cannot be predicted from studying one factor at a time, might be interesting for stomatal modellers, too.
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Affiliation(s)
- Ebe Merilo
- Institute of Technology, University of Tartu, Nooruse 1, 50411, Tartu, Estonia
| | - Indrek Jõesaar
- Institute of Technology, University of Tartu, Nooruse 1, 50411, Tartu, Estonia
| | - Mikael Brosché
- Institute of Technology, University of Tartu, Nooruse 1, 50411, Tartu, Estonia
- Division of Plant Biology, Department of Biosciences, University of Helsinki, PO Box 65 (Viikinkaari 1), FI-00014, Helsinki, Finland
| | - Hannes Kollist
- Institute of Technology, University of Tartu, Nooruse 1, 50411, Tartu, Estonia
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Abstract
The plasma membrane H(+)-ATPase is the pump that provides the driving force for transport of numerous solutes in plant cells, and plays an essential role for the growth and maintenance of cell homeostasis. Recent investigations using guard cells with respect to blue-light-induced stomatal opening uncovered the regulatory mechanisms of the H(+)-ATPase, and revealed that the phosphorylation status of penultimate threonine in the C-terminus of H(+)-ATPase is key step for the activity regulation. The same regulatory mechanisms for the H(+)-ATPase were evidenced in hypocotyl elongation in response to ABA and auxin, suggesting that the phosphorylation of the penultimate threonine is a common regulatory mechanism for the H(+)-ATPase. We also present the data that the activity of the H(+)-ATPase limits the plant growth. Typical structure of the H(+)-ATPase in the C-terminus was acquired in the transition of plants from water to the terrestrial land.
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Affiliation(s)
- Yin Wang
- Institute for Advanced Research, Nagoya University, Nagoya, Japan; Institute of Transformative Bio-Molecules (WPI-ITbM) Nagoya, Japan
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30
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Zhang T, Chen S, Harmon AC. Protein phosphorylation in stomatal movement. PLANT SIGNALING & BEHAVIOR 2014; 9:e972845. [PMID: 25482764 PMCID: PMC4622631 DOI: 10.4161/15592316.2014.972845] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Accepted: 07/16/2014] [Indexed: 05/18/2023]
Abstract
As research progresses on how guard cells perceive and transduce environmental cues to regulate stomatal movement, plant biologists are discovering key roles of protein phosphorylation. Early research efforts focused on characterization of ion channels and transporters in guard cell hormonal signaling. Subsequent genetic studies identified mutants of kinases and phosphatases that are defective in regulating guard cell ion channel activities, and recently proteins regulated by phosphorylation have been identified. Here we review the essential role of protein phosphorylation in ABA-induced stomatal closure and in blue light-induced stomatal opening. We also highlight evidence for the cross-talk between different pathways, which is mediated by protein phosphorylation.
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Key Words
- AAPK, ABA activated protein kinase
- ABA
- ABA, abscisic acid
- ABI, abscisic acid insensitive
- AHK5, Arabidopsis histidine kinases 5
- AKS, ABA-responsive kinase substrates
- BL, blue light
- BLUS1, blue light signaling1
- CBL, calcineurin-B like proteins
- CIPK, CBL-interacting protein kinase
- CPK, calcium dependent protein kinase
- EPs, epidermal peels
- GCPs, guard cell protoplasts
- GHR1, guard cell hydrogen peroxide-resistant1
- HAB1, homology to ABI1
- HRB1, hypersensitive to red and blue 1
- HXK, hexokinase
- IHC, immunohistochemistry
- KAT1, K+ channel in A. thaliana 1
- LC-MS/MS, liquid chromatography–mass spectrometry
- MAP4K, mitogen-activated protein kinase kinase kinase kinase
- MPK, mitogen-activated protein kinase
- MeJA, methyl jasmonate
- NO, nitric oxide
- OST1, open stomata 1
- PA, phosphatidic acid
- PHO1, phosphate1
- PP1, protein phosphatase
- PP7, protein phosphatase
- PRSL1, PP1 regulatory subunit2-like protein1
- PTPases, protein tyrosine phosphatases
- QUAC1, quickly-activating anion channel 1
- RBOH, respiratory burst oxidase homolog
- ROS
- ROS, reactive oxygen species
- SLAC1, slow anion channel-associated 1
- SnRK2.6, sucrose nonfermenting-1 (Snf1)-related protein kinase 2.6
- blue light
- guard cell, ion channel
- kinase
- phosphatase
- protein phosphorylation
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Affiliation(s)
- Tong Zhang
- Department of Biology and the University of Florida Genetics Institute; University of Florida; Gainesville, FL USA
| | - Sixue Chen
- Department of Biology and the University of Florida Genetics Institute; University of Florida; Gainesville, FL USA
- Interdisciplinary Center for Biotechnology Research; University of Florida; Gainesville, FL USA
- Plant Molecular and Cellular Biology Program; University of Florida; Gainesville, FL USA
| | - Alice C Harmon
- Department of Biology and the University of Florida Genetics Institute; University of Florida; Gainesville, FL USA
- Plant Molecular and Cellular Biology Program; University of Florida; Gainesville, FL USA
- Correspondence to: Alice C Harmon;
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31
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Hlavinka J, Nauš J, Fellner M. Spontaneous mutation 7B-1 in tomato impairs blue light-induced stomatal opening. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2013; 209:75-80. [PMID: 23759105 DOI: 10.1016/j.plantsci.2013.04.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Revised: 04/05/2013] [Accepted: 04/28/2013] [Indexed: 06/02/2023]
Abstract
It was reported earlier that 7B-1 mutant in tomato (Solanum lycopersicum L.), an ABA overproducer, is defective in blue light (BL) signaling leading to BL-specific resistance to abiotic and biotic stresses. In this work, we examine responses of stomata to blue, red and white lights, fusicoccin, anion channel blockers (anthracene-9-carboxylic acid; 9-AC and niflumic acid; NIF) and ABA. Our results showed that the aperture of 7B-1 stomata does not increase in BL, suggesting that 7B-1 mutation impairs an element of BL signaling pathway involved in stomatal opening. Similar stomatal responses of 7B-1 and wild type (WT) to fusicoccin or 9-AC points out that activity of H(+)-ATPase and 9-AC-sensitive anion channels per se is not likely affected by the mutation. Since 9-AC restored stomatal opening of 7B-1 in BL, it seems that 9-AC and BL could block similar type of anion channels. The stomata of both genotypes did not respond to NIF neither in darkness nor in any light conditions tested. In light, 9-AC but not NIF restored stomatal opening inhibited by ABA in WT and 7B-1. We suggest that in comparison to WT, the activity of S-type anion channels in 7B-1 is more promoted by increased ABA content, and less reduced by BL, because of the mutant resistance to BL.
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Affiliation(s)
- Jan Hlavinka
- Centre of the Region Haná for Biotechnological and Agricultural Research, Department of Biophysics, Faculty of Science, Palacký University in Olomouc, Šlechtitelů 11, Olomouc CZ-78371, Czech Republic.
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32
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Fujita T, Noguchi K, Terashima I. Apoplastic mesophyll signals induce rapid stomatal responses to CO2 in Commelina communis. THE NEW PHYTOLOGIST 2013; 199:395-406. [PMID: 23560389 DOI: 10.1111/nph.12261] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Accepted: 03/06/2013] [Indexed: 05/18/2023]
Abstract
Previous studies have suggested that the mesophyll contributes to stomatal CO(2) responses. The effects of changes in CO(2) concentration (100 or 700 ppm) on stomatal responses in red or white light were examined microscopically in a leaf segment, an epidermal strip and an epidermal strip placed on a mesophyll segment of Commelina communis, all mounted on a buffer-containing gel. In both red and white light, stomata of the leaf segment opened/closed rapidly at low/high CO(2). In red light, epidermal strip stomata barely responded to CO(2). In white light, they opened at low CO(2), but hardly closed at high CO(2). Stomata of the epidermal strip placed on the mesophyll responded in the same manner as those on the leaf segment. Insertion of a doughnut-shaped cellophane spacer (but not polyethylene spacer) between the epidermal strip and the mesophyll hardly altered these responses. Stomata in leaf segments treated with 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU), a photosynthesis inhibitor, did not open in red light, but opened/closed at low/high CO(2) in white light. These results indicate that the apoplast transfer of 'mesophyll signals' and the stomatal opening at low CO(2) are dependent on photosynthesis, whereas the stomatal closure at high CO(2) is independent of photosynthesis.
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Affiliation(s)
- Takashi Fujita
- Plant Sciences, Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 1130033, Japan
| | - Ko Noguchi
- Plant Sciences, Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 1130033, Japan
| | - Ichiro Terashima
- Plant Sciences, Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 1130033, Japan
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33
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Ando E, Ohnishi M, Wang Y, Matsushita T, Watanabe A, Hayashi Y, Fujii M, Ma JF, Inoue SI, Kinoshita T. TWIN SISTER OF FT, GIGANTEA, and CONSTANS have a positive but indirect effect on blue light-induced stomatal opening in Arabidopsis. PLANT PHYSIOLOGY 2013; 162:1529-38. [PMID: 23669744 PMCID: PMC3707529 DOI: 10.1104/pp.113.217984] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2013] [Accepted: 05/08/2013] [Indexed: 05/18/2023]
Abstract
FLOWERING LOCUS T (FT) is the major regulatory component controlling photoperiodic floral transition. It is expressed in guard cells and affects blue light-induced stomatal opening induced by the blue-light receptor phototropins phot1 and phot2. Roles for other flowering regulators in stomatal opening have yet to be determined. We show in Arabidopsis (Arabidopsis thaliana) that TWIN SISTER OF FT (TSF), CONSTANS (CO), and GIGANTEA (GI) provide a positive effect on stomatal opening. TSF, which is the closest homolog of FT, was transcribed in guard cells, and light-induced stomatal opening was repressed in tsf-1, a T-DNA insertion mutant of TSF. Overexpression of TSF in a phot1 phot2 mutant background gave a constitutive open-stomata phenotype. Then, we examined whether CO and GI, which are upstream regulators of FT and TSF in photoperiodic flowering, are involved in stomatal opening. Similar to TSF, light-induced stomatal opening was suppressed in the GI and CO mutants gi-1 and co-1. A constitutive open-stomata phenotype was observed in GI and CO overexpressors with accompanying changes in the transcription of both FT and TSF. In photoperiodic flowering, photoperiod is sensed by photoreceptors such as the cryptochromes cry1 and cry2. We examined stomatal phenotypes in a cry1 cry2 mutant and in CRY2 overexpressors. Light-induced stomatal opening was suppressed in cry1 cry2, and the transcription of FT and TSF was down-regulated. In contrast, the stomata in CRY2 overexpressors opened even in the dark, and FT and TSF transcription was up-regulated. We conclude that the photoperiodic flowering components TSF, GI, and CO positively affect stomatal opening.
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34
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Aggarwal C, Łabuz J, Gabryś H. Phosphoinositides play differential roles in regulating phototropin1- and phototropin2-mediated chloroplast movements in Arabidopsis. PLoS One 2013; 8:e55393. [PMID: 23405144 PMCID: PMC3566141 DOI: 10.1371/journal.pone.0055393] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Accepted: 12/24/2012] [Indexed: 01/06/2023] Open
Abstract
Phototropins are UVA/blue-light receptors involved in controlling the light-dependent physiological responses which serve to optimize the photosynthetic activity of plants and promote growth. The phototropin-induced phosphoinositide (PI) metabolism has been shown to be essential for stomatal opening and phototropism. However, the role of PIs in phototropin-induced chloroplast movements remains poorly understood. The aim of this work is to determine which PI species are involved in the control of chloroplast movements in Arabidopsis and the nature of their involvement. We present the effects of the inactivation of phospholipase C (PLC), PI3-kinase (PI3K) and PI4-kinase (PI4K) on chloroplast relocations in Arabidopsis. The inhibition of the phosphatidylinositol 4,5-bisphospahte [PI(4,5)P2]-PLC pathway, using neomycin and U73122, suppressed the phot2-mediated chloroplast accumulation and avoidance responses, without affecting movement responses controlled by phot1. On the other hand, PI3K and PI4K activities are more restricted to phot1- and phot2-induced weak-light responses. The inactivation of PI3K and PI4K by wortmannin and LY294002 severely affected the weak blue-light-activated accumulation response but had little effect on the strong blue-light-activated avoidance response. The inhibitory effect observed with PI metabolism inhibitors is, at least partly, due to a disturbance in Ca2+(c) signaling. Using the transgenic aequorin system, we show that the application of these inhibitors suppresses the blue-light-induced transient Ca2+(c) rise. These results demonstrate the importance of PIs in chloroplast movements, with the PI(4,5)P2-PLC pathway involved in phot2 signaling while PI3K and PI4K are required for the phot1- and phot2-induced accumulation response. Our results suggest that these PIs modulate cytosolic Ca2+ signaling during movements.
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Affiliation(s)
- Chhavi Aggarwal
- Department of Plant Biotechnology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
| | - Justyna Łabuz
- Department of Plant Biotechnology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
| | - Halina Gabryś
- Department of Plant Biotechnology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
- * E-mail:
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35
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Laanemets K, Wang YF, Lindgren O, Wu J, Nishimura N, Lee S, Caddell D, Merilo E, Brosche M, Kilk K, Soomets U, Kangasjärvi J, Schroeder JI, Kollist H. Mutations in the SLAC1 anion channel slow stomatal opening and severely reduce K+ uptake channel activity via enhanced cytosolic [Ca2+] and increased Ca2+ sensitivity of K+ uptake channels. THE NEW PHYTOLOGIST 2013; 197:88-98. [PMID: 23126621 PMCID: PMC3508330 DOI: 10.1111/nph.12008] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Accepted: 09/17/2012] [Indexed: 05/19/2023]
Abstract
The Arabidopsis guard cell anion channel SLAC1 is essential for stomatal closure in response to various endogenous and environmental stimuli. Interestingly, here we reveal an unexpected impairment of slac1 alleles on stomatal opening. We report that mutations in SLAC1 unexpectedly slow stomatal opening induced by light, low CO(2) and elevated air humidity in intact plants and that this is caused by the severely reduced activity of inward K(+) (K(+)(in)) channels in slac1 guard cells. Expression of channels and transporters involved in stomatal opening showed small but significant reductions in transcript levels in slac1 guard cells; however, this was deemed insufficient to explain the severely impaired K(+)(in) channel activity in slac1. We further examined resting cytosolic Ca(2+) concentration ([Ca(2+)](cyt)) and K(+)(in) channel sensitivity to [Ca(2+)](cyt) in slac1. These experiments showed higher resting [Ca(2+)](cyt) in slac1 guard cells and that reducing [Ca(2+)](cyt) to < 10 nM rapidly restored the activity of K(+)(in) channels in slac1 closer to wild-type levels. These findings demonstrate an unanticipated compensatory feedback control in plant stomatal regulation, which counteracts the impaired stomatal closing response of slac1, by down-regulating stomatal opening mechanisms and implicates enhanced [Ca(2+)](cyt) sensitivity priming as a mechanistic basis for the down-regulated K(+)(in) channel activity.
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Affiliation(s)
| | - Yong-Fei Wang
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla CA 92093-0116, USA
- National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Shanghai Institute for Biological Sciences, The Chinese Academy of Sciences, Shanghai 200032, China
| | - Ove Lindgren
- Institute of Technology, University of Tartu, 50411 Tartu, Estonia
| | - Juyou Wu
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla CA 92093-0116, USA
| | - Noriyuki Nishimura
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla CA 92093-0116, USA
| | - Stephen Lee
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla CA 92093-0116, USA
| | - Daniel Caddell
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla CA 92093-0116, USA
| | - Ebe Merilo
- Institute of Technology, University of Tartu, 50411 Tartu, Estonia
| | - Mikael Brosche
- Institute of Technology, University of Tartu, 50411 Tartu, Estonia
- Division of Plant Biology, Department of Biosciences, University of Helsinki, PO Box 65, FI-00014 Helsinki, Finland
| | - Kalle Kilk
- Department of Biochemistry, University of Tartu, 50411, Tartu, Estonia
| | - Ursel Soomets
- Department of Biochemistry, University of Tartu, 50411, Tartu, Estonia
| | - Jaakko Kangasjärvi
- Division of Plant Biology, Department of Biosciences, University of Helsinki, PO Box 65, FI-00014 Helsinki, Finland
| | - Julian I. Schroeder
- Division of Biological Sciences, Cell and Developmental Biology Section, University of California San Diego, La Jolla CA 92093-0116, USA
| | - Hannes Kollist
- Institute of Technology, University of Tartu, 50411 Tartu, Estonia
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Abstract
Since the first recordings of single potassium channel activities in the plasma membrane of guard cells more than 25 years ago, patch-clamp studies discovered a variety of ion channels in all cell types and plant species under inspection. Their properties differed in a cell type- and cell membrane-dependent manner. Guard cells, for which the existence of plant potassium channels was initially documented, advanced to a versatile model system for studying plant ion channel structure, function, and physiology. Interestingly, one of the first identified potassium-channel genes encoding the Shaker-type channel KAT1 was shown to be highly expressed in guard cells. KAT1-type channels from Arabidopsis thaliana and its homologs from other species were found to encode the K+-selective inward rectifiers that had already been recorded in early patch-clamp studies with guard cells. Within the genome era, additional Arabidopsis Shaker-type channels appeared. All nine members of the Arabidopsis Shaker family are localized at the plasma membrane, where they either operate as inward rectifiers, outward rectifiers, weak voltage-dependent channels, or electrically silent, but modulatory subunits. The vacuole membrane, in contrast, harbors a set of two-pore K+ channels. Just very recently, two plant anion channel families of the SLAC/SLAH and ALMT/QUAC type were identified. SLAC1/SLAH3 and QUAC1 are expressed in guard cells and mediate Slow- and Rapid-type anion currents, respectively, that are involved in volume and turgor regulation. Anion channels in guard cells and other plant cells are key targets within often complex signaling networks. Here, the present knowledge is reviewed for the plant ion channel biology. Special emphasis is drawn to the molecular mechanisms of channel regulation, in the context of model systems and in the light of evolution.
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Affiliation(s)
- Rainer Hedrich
- University of Wuerzburg, Institute for Molecular Plant Physiology and Biophysics, Wuerzburg, Germany; and King Saud University, Riyadh, Saudi Arabia
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Roelfsema MRG, Hedrich R, Geiger D. Anion channels: master switches of stress responses. TRENDS IN PLANT SCIENCE 2012; 17:221-9. [PMID: 22381565 DOI: 10.1016/j.tplants.2012.01.009] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2011] [Revised: 01/13/2012] [Accepted: 01/19/2012] [Indexed: 05/18/2023]
Abstract
During stress, plant cells activate anion channels and trigger the release of anions across the plasma membrane. Recently, two new gene families have been identified that encode major groups of anion channels. The SLAC/SLAH channels are characterized by slow voltage-dependent activation (S-type), whereas ALMT genes encode rapid-activating channels (R-type). Both S- and R-type channels are stimulated in guard cells by the stress hormone ABA, which leads to stomatal closure. Besides their role in ABA-dependent stomatal movement, anion channels are also activated by biotic stress factors such as microbe-associated molecular patterns (MAMPs). Given that anion channels occur throughout the plant kingdom, they are likely to serve a general function as master switches of stress responses.
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Affiliation(s)
- M Rob G Roelfsema
- Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute for Biosciences, Biocenter, Würzburg University, Julius-von-Sachs-Platz 2, D-97082 Würzburg, Germany.
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Zhao X, Qiao XR, Yuan J, Ma XF, Zhang X. Nitric oxide inhibits blue light-induced stomatal opening by regulating the K+ influx in guard cells. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2012; 184:29-35. [PMID: 22284707 DOI: 10.1016/j.plantsci.2011.12.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2011] [Revised: 12/08/2011] [Accepted: 12/09/2011] [Indexed: 05/31/2023]
Abstract
Blue light (BL)-induced stomatal opening and nitric oxide (NO)-promoted stomatal closure comprise two main aspects of stomatal regulation. Stomatal movement depends on ion fluxion in guard cells, whereas the physiological roles of BL or NO in regulating ion channel activities remain largely unknown. For gaining further insights into NO function in mediating BL-induced stomatal opening, guard cell protoplasts (GCPs) were patch-clamped in a whole-cell configuration. The results showed that twice BL pulses (100 μmol m⁻² s⁻¹ for 30s) effectively activated inward rectifying K⁺ channels by 67% and 20% in Vicia GCPs, respectively. In contrast, Red light (RL) showed little effect on inward rectifying K⁺ channels. In accord with this, BL also increased inward K⁺ currents by 54% in Arabidopsis thaliana wild type gl1, but not in phot1-5 phot2-1 (BL receptor phototropin deletion mutant). Sodium nitroprusside (SNP, a NO donor), at 100 μM, inhibited BL-dependent K⁺ influx and stomatal opening, which were abolished by c-PTIO (a specific NO scavenger). These results indicated that NO inhibits BL-induced stomatal opening maybe through restricting the K⁺ influx across plasma membrane in guard cells.
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Affiliation(s)
- Xiang Zhao
- State Key Laboratory of Cotton Biology, Key laboratory of Plant Stress Biology, College of Life Sciences, Henan University, Kaifeng 475004, People's Republic of China
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Mumm P, Wolf T, Fromm J, Roelfsema MRG, Marten I. Cell type-specific regulation of ion channels within the maize stomatal complex. PLANT & CELL PHYSIOLOGY 2011; 52:1365-75. [PMID: 21690176 DOI: 10.1093/pcp/pcr082] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The stomatal complex of Zea mays is composed of two pore-forming guard cells and two adjacent subsidiary cells. For stomatal movement, potassium ions and anions are thought to shuttle between these two cell types. As potential cation transport pathways, K(+)-selective channels have already been identified and characterized in subsidiary cells and guard cells. However, so far the nature and regulation of anion channels in these cell types have remained unclear. In order to bridge this gap, we performed patch-clamp experiments with subsidiary cell and guard cell protoplasts. Voltage-independent anion channels were identified in both cell types which, surprisingly, exhibited different, cell-type specific dependencies on cytosolic Ca(2+) and pH. After impaling subsidiary cells of intact maize plants with microelectrodes and loading with BCECF [(2',7'-bis-(2-carboxyethyl)-5(and6)carboxyflurescein] as a fluorescent pH indicator, the regulation of ion channels by the cytosolic pH and the membrane voltage was further examined. Stomatal closure was found to be accompanied by an initial hyperpolarization and cytosolic acidification of subsidiary cells, while opposite responses were observed during stomatal opening. Our findings suggest that specific changes in membrane potential and cytosolic pH are likely to play a role in determining the direction and capacity of ion transport in subsidiary cells.
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Affiliation(s)
- Patrick Mumm
- University of Würzburg, Department of Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, Julius-von-Sachs-Platz 2, D-97082 Würzburg, Germany
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40
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Aasamaa K, Sõber A. Responses of stomatal conductance to simultaneous changes in two environmental factors. TREE PHYSIOLOGY 2011; 31:855-64. [PMID: 21856657 DOI: 10.1093/treephys/tpr078] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
To clarify interactions between stomatal responses to two simultaneous environmental changes, the rates of change in stomatal conductance were measured after simultaneously changing two environmental factors from the set of air humidity, leaf water potential (hydraulic environmental factors), air CO(2) concentration and light intensity (photosynthetic environmental factors). The stomatal responses to changes in leaf water potential were not significantly modified by any other simultaneous environmental change. A decrease in air humidity was followed by a decrease in stomatal conductance, and an increase in air humidity was followed by an increase in the conductance, irrespective of the character of the simultaneous change in the photosynthetic environmental factor. If the simultaneous change had an opposite effect on stomatal conductance, the rate of change in stomatal conductance was higher than the theoretical summed rate-the sum of the rate following one environmental change and the rate following another environmental change, measured separately. That is, the stomatal response to air humidity dominated over the responses to photosynthetic environmental factors. Yet, if the simultaneous change in photosynthetic factors had a codirectional effect on stomatal conductance, the rate of stomatal conductance change was lower than the theoretical summed rate. After a simultaneous change of two photosynthetic environmental factors, the rate of stomatal conductance change was very similar to the theoretical rate, if both the environmental changes had a codirectional effect on stomatal conductance. If the changes in the photosynthetic factors had opposite effects on stomatal conductance, the conductance increased, irrespective of the character of the increasing environmental factor. In drought-stressed trees, the rates of change in stomatal conductance tended to differ from the theoretical summed rates more than in well-watered trees. Stomatal closure following an increase in CO(2) concentration was the stomatal response that was most strongly suppressed by the response to another simultaneous environmental change. Six species of temperate deciduous trees were shown to be similar in their relations between the stomatal responses to two simultaneous environmental changes. The mechanism and ecological significance of the interactions between the two signal response pathways of stomata are discussed.
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Affiliation(s)
- Krõõt Aasamaa
- Department of Silviculture, Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Kreutzwaldi 5, Tartu 51014, Estonia.
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41
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Geiger D, Maierhofer T, Al-Rasheid KAS, Scherzer S, Mumm P, Liese A, Ache P, Wellmann C, Marten I, Grill E, Romeis T, Hedrich R. Stomatal closure by fast abscisic acid signaling is mediated by the guard cell anion channel SLAH3 and the receptor RCAR1. Sci Signal 2011; 4:ra32. [PMID: 21586729 DOI: 10.1126/scisignal.2001346] [Citation(s) in RCA: 238] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
S-type anion channels are direct targets of abscisic acid (ABA) signaling and contribute to chloride and nitrate release from guard cells, which in turn initiates stomatal closure. SLAC1 was the first component of the guard cell S-type anion channel identified. However, we found that guard cells of Arabidopsis SLAC1 mutants exhibited nitrate conductance. SLAH3 (SLAC1 homolog 3) was also present in guard cells, and coexpression of SLAH3 with the calcium ion (Ca2+)-dependent kinase CPK21 in Xenopus oocytes mediated nitrate-induced anion currents. Nitrate, calcium, and phosphorylation regulated SLAH3 activity. CPK21-dependent SLAH3 phosphorylation and activation were blocked by ABI1, a PP2C-type protein phosphatase that is inhibited by ABA and inhibits the ABA signaling pathway in guard cells. We reconstituted the ABA-stimulated phosphorylation of the SLAH3 amino-terminal domain by CPK21 in vitro by including the ABA receptor-phosphatase complex RCAR1-ABI1 in the reactions. We propose that ABA perception by the complex consisting of ABA receptors of the RCAR/PYR/PYL family and ABI1 releases CPK21 from inhibition by ABI1, and then CPK21 is further activated by an increase in the cytosolic Ca2+ concentration, leading to its phosphorylation of SLAH3. Thus, the identification of SLAH3 as the nitrate-, calcium-, and ABA-sensitive guard cell anion channel provides insights into the relationship among stomatal response to drought, signaling by nitrate, and nitrate metabolism.
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Affiliation(s)
- Dietmar Geiger
- Institute for Molecular Plant Physiology and Biophysics, University Würzburg, Julius-von-Sachs Platz 2, D-97082 Würzburg, Germany
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Plant Proton Pumps: Regulatory Circuits Involving H+-ATPase and H+-PPase. SIGNALING AND COMMUNICATION IN PLANTS 2011. [DOI: 10.1007/978-3-642-14369-4_2] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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Marten I, Deeken R, Hedrich R, Roelfsema MRG. Light-induced modification of plant plasma membrane ion transport. PLANT BIOLOGY (STUTTGART, GERMANY) 2010; 12 Suppl 1:64-79. [PMID: 20712622 DOI: 10.1111/j.1438-8677.2010.00384.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Light is not only the driving force for electron and ion transport in the thylakoid membrane, but also regulates ion transport in various other membranes of plant cells. Light-dependent changes in ion transport at the plasma membrane and associated membrane potential changes have been studied intensively over the last century. These studies, with various species and cell types, revealed that apart from regulation by chloroplasts, plasma membrane transport can be controlled by phytochromes, phototropins or channel rhodopsins. In this review, we compare light-dependent plasma membrane responses of unicellular algae (Eremosphaera and Chlamydomonas), with those of a multicellular alga (Chara), liverworts (Conocephalum), mosses (Physcomitrella) and several angiosperm cell types. Light-dependent plasma membrane responses of Eremosphaera and Chara are characterised by the dominant role of K(+) channels during membrane potential changes. In most other species, the Ca(2+)-dependent activation of plasma membrane anion channels represents a general light-triggered event. Cell type-specific responses are likely to have evolved by modification of this general response or through the development of additional light-dependent signalling pathways. Future research to elucidate these light-activated signalling chains is likely to benefit from the recent identification of S-type anion channel genes and proteins capable of regulating these channels.
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Affiliation(s)
- I Marten
- Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute for Biosciences Biocenter, Würzburg University, Würzburg, Germany
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Geiger D, Scherzer S, Mumm P, Stange A, Marten I, Bauer H, Ache P, Matschi S, Liese A, Al-Rasheid KAS, Romeis T, Hedrich R. Activity of guard cell anion channel SLAC1 is controlled by drought-stress signaling kinase-phosphatase pair. Proc Natl Acad Sci U S A 2009; 106:21425-30. [PMID: 19955405 PMCID: PMC2795561 DOI: 10.1073/pnas.0912021106] [Citation(s) in RCA: 627] [Impact Index Per Article: 41.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2009] [Indexed: 11/18/2022] Open
Abstract
In response to drought stress the phytohormone ABA (abscisic acid) induces stomatal closure and, therein, activates guard cell anion channels in a calcium-dependent as well as-independent manner. Two key components of the ABA signaling pathway are the protein kinase OST1 (open stomata 1) and the protein phosphatase ABI1 (ABA insensitive 1). The recently identified guard cell anion channel SLAC1 appeared to be the key ion channel in this signaling pathway but remained electrically silent when expressed heterologously. Using split YFP assays, we identified OST1 as an interaction partner of SLAC1 and ABI1. Upon coexpression of SLAC1 with OST1 in Xenopus oocytes, SLAC1-related anion currents appeared similar to those observed in guard cells. Integration of ABI1 into the SLAC1/OST1 complex, however, prevented SLAC1 activation. Our studies demonstrate that SLAC1 represents the slow, deactivating, weak voltage-dependent anion channel of guard cells controlled by phosphorylation/dephosphorylation.
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Affiliation(s)
- Dietmar Geiger
- University Wuerzburg, Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs Platz 2, D-97082 Wuerzburg, Germany
| | - Sönke Scherzer
- University Wuerzburg, Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs Platz 2, D-97082 Wuerzburg, Germany
| | - Patrick Mumm
- University Wuerzburg, Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs Platz 2, D-97082 Wuerzburg, Germany
| | - Annette Stange
- University Wuerzburg, Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs Platz 2, D-97082 Wuerzburg, Germany
| | - Irene Marten
- University Wuerzburg, Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs Platz 2, D-97082 Wuerzburg, Germany
| | - Hubert Bauer
- University Wuerzburg, Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs Platz 2, D-97082 Wuerzburg, Germany
| | - Peter Ache
- University Wuerzburg, Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs Platz 2, D-97082 Wuerzburg, Germany
| | - Susanne Matschi
- Department of Plant Biochemistry, Free University Berlin, Koenigin-Luise-Str. 12-16, D-14195 Berlin, Germany; and
| | - Anja Liese
- Department of Plant Biochemistry, Free University Berlin, Koenigin-Luise-Str. 12-16, D-14195 Berlin, Germany; and
| | - Khaled A. S. Al-Rasheid
- Zoology Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Tina Romeis
- Department of Plant Biochemistry, Free University Berlin, Koenigin-Luise-Str. 12-16, D-14195 Berlin, Germany; and
| | - Rainer Hedrich
- University Wuerzburg, Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs Platz 2, D-97082 Wuerzburg, Germany
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Bergougnoux V, Hlavácková V, Plotzová R, Novák O, Fellner M. The 7B-1 mutation in tomato (Solanum lycopersicum L.) confers a blue light-specific lower sensitivity to coronatine, a toxin produced by Pseudomonas syringae pv. tomato. JOURNAL OF EXPERIMENTAL BOTANY 2009; 60:1219-1230. [PMID: 19213807 DOI: 10.1093/jxb/ern366] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The spontaneous mutant 7B-1 in tomato (Solanum lycopersicum=Lycopersicon esculentum) is a photoperiod-dependent male-sterile mutant previously reported as resistant to various abiotic stresses specifically under blue light. Since this finding improved the potential of 7B-1's use in breeding programmes, its susceptibility to stress induced by coronatine (COR), the phytotoxine produced by several Pseudomonas syringae strains, was assessed in this study. The 7B-1 mutant was found to be less sensitive than the corresponding wild type (WT) to COR treatment in a blue light-dependent manner. Treatment of WT and 7B-1 plants with COR induced a strong accumulation of salicylic acid (SA), jasmonic acid (JA), and abscisic acid (ABA) in hypocotyls. Interestingly, accumulation of ABA and SA in the 7B-1 mutant was distinctly greater than in WT, especially in blue light. Based on the cross-talk between SA- and JA-signalling pathways, expression analysis of NPR1 and COI1 genes, respectively involved in these pathways, was investigated in COR-stressed plants. The blue light-specific lower sensitivity of 7B-1 plants to COR was found to be associated with blue light-specific overexpression of the NPR1 gene. These data suggest that the SA-dependent NPR1-dependent pathway could be involved in the lower sensitivity of the 7B-1 mutant to COR. The role of anthocyanins and ABA accumulation during the response to COR is also discussed in the present study.
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Affiliation(s)
- Véronique Bergougnoux
- Palacky University in Olomouc, Faculty of Science, Department of Cell Biology and Genetics, Laboratory of Molecular Physiology, Slechtitelů 11, 783 71 Olomouc, Czech Republic
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46
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Harada A, Shimazaki KI. Measurement of changes in cytosolic Ca2+ in Arabidopsis guard cells and mesophyll cells in response to blue light. PLANT & CELL PHYSIOLOGY 2009; 50:360-73. [PMID: 19106118 DOI: 10.1093/pcp/pcn203] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Phototropins (phot1 and phot2) are blue light (BL) receptors that mediate responses including phototropism, chloroplast movement and stomatal opening, and increased cytosolic Ca(2+). BL absorbed by phototropins activates plasma membrane H(+)-ATPase in guard cells, resulting in membrane hyperpolarization, and drives K(+) uptake and stomatal opening. However, it is unclear whether the phototropin-mediated Ca(2+) increase activates the H(+)-ATPase. Here, we determined cytosolic Ca(2+) concentrations in guard cell protoplasts (GCPs) from Arabidopsis transformed with aequorin. Cytosolic Ca(2+) increased rapidly in response to BL in GCPs from both the wild type and phot1 phot2 double mutants, but was mostly suppressed by an inhibitor of photosynthetic electron flow (DCMU). With depleted external K(+), we observed another slower Ca(2+) increase, which was phototropin- dependent. Fusicoccin, a H(+)-ATPase activator, mimicked the effect of BL. The slow Ca(2+) increase thus appears to result from membrane hyperpolarization. The slow Ca(2+) increase was suppressed by external K(+) and was restored by blockers of inward-rectifying K(+) channels, CsCl and tetraethylammonium, suggesting the preferential uptake of K(+) over Ca(2+). Such efficient K(+) uptake in response to BL was not found in mesophyll cells. Both the fast and the slow Ca(2+) increases were inhibited by Ca(2+) channel blockers (CoCl(2) and LaCl(3)) and a chelating agent (EGTA). These results indicate that the phototropin-mediated Ca(2+) increase was not observed prior to H(+)-ATPase activation in guard cells and that Ca(2+) entered guard cells via Ca(2+) channels through photosynthesis and phototropin-mediated membrane hyperpolarization.
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Affiliation(s)
- Akiko Harada
- Department of Biology, Kyushu University, Fukuoka, Japan.
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Monti A, Bezzi G, Venturi G. Internal conductance under different light conditions along the plant profile of Ethiopian mustard (Brassica carinata A. Brown.). JOURNAL OF EXPERIMENTAL BOTANY 2009; 60:2341-50. [PMID: 19237547 DOI: 10.1093/jxb/erp032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
This study focused on the internal conductance (g(i)) along the plant profile of Ethiopian mustard under two light conditions: (i) light from the top only (I1); (ii) light from the top integrated by supplementary lateral light along the whole plant profile (I2). Lateral light strongly increased the productivity (e.g. +104% of seed oil) and net photosynthesis (A). The latter appeared more driven by g(i) (r=0.78**) than by stomatal conductance (g(s)) (r=0.51*). Importantly, irradiance also considerably shortened the time from leaf appearance to senescence, which means that corresponding leaves in I1 and I2 had different ages. Therefore, since leaf age and irradiance have counteracting effects on g(i), I1 sometimes showed higher g(i) values than I2. With respect to irradiance, leaf age had clearly higher effects on g(i), which radically declined from the top to the basal leaves, even under constant light conditions. The internal conductance caused a significant drawdown of CO(2) from the sub-stomatal cavity (C(i)) to the site of carboxylation (C(c)) that, in turn, led to a substantial underestimation of V(cmax) calculated using the A/C(i) model. Again, the trends of g(i) and g(s) were not consistent along the plant profile, and so the ratio between stomatal and internal limitations to A changed from top to bottom leaves, accordingly. This study suggests that g(i) may be a valuable trait for increasing photosynthetic capacity and productivity; nonetheless, it suggests caution in selecting leaves for high g(i), as the latter can considerably change along the plant profile due to leaf age and irradiance effects.
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Affiliation(s)
- Andrea Monti
- Department of Agroenvironmental Science and Technology, University of Bologna, Italy.
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48
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Abstract
Chloroplasts are a key feature of most guard cells; however, the function of these organelles in stomatal responses has been a subject of debate. This review examines evidence for and against a role of guard cell chloroplasts in stimulating stomatal opening. Controversy remains over the extent to which guard cell Calvin cycle activity contributes to stomatal regulation. However, this is only one of four possible functions of guard cell chloroplasts; other roles include supply of ATP, blue-light signalling and starch storage. Evidence exists for all these mechanisms, but is highly dependent upon species and growth/measurement conditions, with inconsistencies between different laboratories reported. Significant plasticity and extreme flexibility in guard cell osmoregulatory, signalling and sensory pathways may be one explanation. The use of chlorophyll a fluorescence analysis of individual guard cells is discussed in assessing guard and mesophyll cell physiology in relation to stomatal function. Developments in transgenic and molecular techniques have recently provided interesting, albeit contrasting, data regarding the role of these highly conserved organelles in stomatal function. Recent studies examining the link between mesophyll photosynthesis and stomatal conductance are discussed. An enhanced understanding of these processes may be fundamental in generating crop plants with greater water use efficiencies, capable of combating future climatic changes.
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Affiliation(s)
- Tracy Lawson
- Department of Biological Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, UK
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Kwak JM, Mäser P, Schroeder JI. The Clickable Guard Cell, Version II: Interactive Model of Guard Cell Signal Transduction Mechanisms and Pathways. THE ARABIDOPSIS BOOK 2008; 6:e0114. [PMID: 22303239 PMCID: PMC3243356 DOI: 10.1199/tab.0114] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Guard cells are located in the leaf epidermis and pairs of guard cells surround and form stomatal pores, which regulate CO(2) influx from the atmosphere into leaves for photosynthetic carbon fixation. Stomatal guard cells also regulate water loss of plants via transpiration to the atmosphere. Signal transduction mechanisms in guard cells integrate a multitude of different stimuli to modulate stomatal apertures. Stomata open in response to light. Stomata close in response to drought stress, elevated CO(2), ozone and low humidity. In response to drought, plants synthesize the hormone abscisic acid (ABA) that triggers closing of stomatal pores. Guard cells have become a highly developed model system for dissecting signal transduction mechanisms in plants and for elucidating how individual signaling mechanisms can interact within a network in a single cell. Many new findings have been made in the last few years. This chapter is an update of an electronic interactive chapter in the previous edition of The Arabidopsis Book (Mäser et al. 2003). Here we focus on mechanisms for which genes and mutations have been characterized, including signaling components for which there is substantial signaling, biochemical and genetic evidence. Ion channels have been shown to represent targets of early signal transduction mechanisms and provide functional signaling and quantitative analysis points to determine where and how mutations affect branches within the guard cell signaling network. Although a substantial number of genes and proteins that function in guard cell signaling have been identified in recent years, there are many more left to be identified and the protein-protein interactions within this network will be an important subject of future research. A fully interactive clickable electronic version of this publication can be accessed at the following web site: http://www-biology.ucsd.edu/labs/schroeder/clickablegc2/. The interactive clickable version includes the following features: Figure 1. Model for the roles of ion channels in ABA signaling.Figure 2. Blue light signaling pathways in guard cells.Figure 3. ABA signaling pathways in guard cells.Figure 1 is linked to explanations that appear upon mouse-over. Figure 2 and Figure 3 are clickable and linked to info boxes, which in turn are linked to TAIR, to relevant abstracts in PubMed, and to updated background explanations from Schroeder et al (2001), used with permission of Annual Reviews of Plant Biology.
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Affiliation(s)
- June M. Kwak
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland 20742
| | - Pascal Mäser
- Institute of Cell Biology, University of Berne, CH-3012 Bern, Switzerland
| | - Julian I. Schroeder
- Division of Biological Sciences, Cell and Developmental Biology Section and Center for Molecular Genetics, University of California, San Diego, La Jolla, California 92093-0116
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Mott KA, Sibbernsen ED, Shope JC. The role of the mesophyll in stomatal responses to light and CO2. PLANT, CELL & ENVIRONMENT 2008; 31:1299-306. [PMID: 18541006 DOI: 10.1111/j.1365-3040.2008.01845.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Stomatal responses to light and CO(2) were investigated using isolated epidermes of Tradescantia pallida, Vicia faba and Pisum sativum. Stomata in leaves of T. pallida and P. sativum responded to light and CO(2), but those from V. faba did not. Stomata in isolated epidermes of all three species could be opened on KCl solutions, but they showed no response to light or CO(2). However, when isolated epidermes of T. pallida and P. sativum were placed on an exposed mesophyll from a leaf of the same species or a different species, they regained responsiveness to light and CO(2). Stomatal responses in these epidermes were similar to those in leaves in that they responded rapidly and reversibly to changes in light and CO(2). Epidermes from V. faba did not respond to light or CO(2) when placed on mesophyll from any of the three species. Experiments with single optic fibres suggest that stomata were being regulated via signals from the mesophyll produced in response to light and CO(2) rather than being sensitized to light and CO(2) by the mesophyll. The data suggest that most of the stomatal response to CO(2) and light occurs in response to a signal generated by the mesophyll.
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Affiliation(s)
- Keith A Mott
- Biology Department, 5305 Old Main Hill, Utah State University, Logan, UT 84321, USA.
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