51
|
Rottmann TM, Fritz C, Lauter A, Schneider S, Fischer C, Danzberger N, Dietrich P, Sauer N, Stadler R. Protoplast-Esculin Assay as a New Method to Assay Plant Sucrose Transporters: Characterization of AtSUC6 and AtSUC7 Sucrose Uptake Activity in Arabidopsis Col-0 Ecotype. FRONTIERS IN PLANT SCIENCE 2018; 9:430. [PMID: 29740457 PMCID: PMC5925572 DOI: 10.3389/fpls.2018.00430] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 03/20/2018] [Indexed: 05/20/2023]
Abstract
The best characterized function of sucrose transporters of the SUC family in plants is the uptake of sucrose into the phloem for long-distance transport of photoassimilates. This important step is usually performed by one specific SUC in every species. However, plants possess small families of several different SUCs which are less well understood. Here, we report on the characterization of AtSUC6 and AtSUC7, two members of the SUC family in Arabidopsis thaliana. Heterologous expression in yeast (Saccharomyces cerevisiae) revealed that AtSUC6Col-0 is a high-affinity H+-symporter that mediates the uptake of sucrose and maltose across the plasma membrane at exceptionally low pH values. Reporter gene analyses revealed a strong expression of AtSUC6Col-0 in reproductive tissues, where the protein product might contribute to sugar uptake into pollen tubes and synergid cells. A knockout of AtSUC6 did not interfere with vegetative development or reproduction, which points toward physiological redundancy of AtSUC6Col-0 with other sugar transporters. Reporter gene analyses showed that AtSUC7Col-0 is expressed in roots and pollen tubes and that this sink specific expression of AtSUC7Col-0 is regulated by intragenic regions. Transport activity of AtSUC7Col-0 could not be analyzed in baker's yeast or Xenopus oocytes because the protein was not correctly targeted to the plasma membrane in both heterologous expression systems. Therefore, a novel approach to analyze sucrose transporters in planta was developed. Plasma membrane localized SUCs including AtSUC6Col-0 and also sucrose specific SWEETs were able to mediate transport of the fluorescent sucrose analog esculin in transformed mesophyll protoplasts. In contrast, AtSUC7Col-0 is not able to mediate esculin transport across the plasma membrane which implicates that AtSUC7Col-0 might be a non-functional pseudogene. The novel protoplast assay provides a useful tool for the quick and quantitative analysis of sucrose transporters in an in planta expression system.
Collapse
|
52
|
Lima VF, Medeiros DB, Dos Anjos L, Gago J, Fernie AR, Daloso DM. Toward multifaceted roles of sucrose in the regulation of stomatal movement. PLANT SIGNALING & BEHAVIOR 2018; 13:e1494468. [PMID: 30067434 PMCID: PMC6149408 DOI: 10.1080/15592324.2018.1494468] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Plant atmospheric CO2 fixation depends on the aperture of stomatal pores at the leaf epidermis. Stomatal aperture or closure is regulated by changes in the metabolism of the two surrounding guard cells, which respond directly to environmental and internal cues such as mesophyll-derived metabolites. Sucrose has been shown to play a dual role during stomatal movements. The sucrose produced in the mesophyll cells can be transported to the vicinity of the guard cells via the transpiration stream, inducing closure in periods of high photosynthetic rate. By contrast, sucrose breakdown within guard cells sustains glycolysis and glutamine biosynthesis during light-induced stomatal opening. Here, we provide an update regarding the role of sucrose in the regulation of stomatal movement highlighting recent findings from metabolic and systems biology studies. We further explore how sucrose-mediated mechanisms of stomatal movement regulation could be useful to understand evolution of stomatal physiology among different plant groups.
Collapse
Affiliation(s)
- V. F. Lima
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, Fortaleza-CE, Brasil
- CONTACT Danilo M. Daloso Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, Fortaleza-CE, Brasil
| | - D. B. Medeiros
- Central metabolism group, Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm Germany
| | - L. Dos Anjos
- Departamento de Biologia, Universidade Federal de Lavras, Lavras-MG, Brasil
| | - J. Gago
- Research Group on Plant Biology under Mediterranean Conditions. Departament de Biologia, Universitat de les Illes Balears)/Instituto de investigaciones Agroambientales y de la Economía del Agua (INAGEA), Illes Balears, Spain
| | - A. R. Fernie
- Central metabolism group, Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm Germany
| | - D. M. Daloso
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, Fortaleza-CE, Brasil
| |
Collapse
|
53
|
Daloso DM, Medeiros DB, Dos Anjos L, Yoshida T, Araújo WL, Fernie AR. Metabolism within the specialized guard cells of plants. THE NEW PHYTOLOGIST 2017; 216:1018-1033. [PMID: 28984366 DOI: 10.1111/nph.14823] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Accepted: 08/21/2017] [Indexed: 05/21/2023]
Abstract
Contents 1018 I. 1018 II. 1019 III. 1022 IV. 1025 V. 1026 VI. 1029 1030 References 1030 SUMMARY: Stomata are leaf epidermal structures consisting of two guard cells surrounding a pore. Changes in the aperture of this pore regulate plant water-use efficiency, defined as gain of C by photosynthesis per leaf water transpired. Stomatal aperture is actively regulated by reversible changes in guard cell osmolyte content. Despite the fact that guard cells can photosynthesize on their own, the accumulation of mesophyll-derived metabolites can seemingly act as signals which contribute to the regulation of stomatal movement. It has been shown that malate can act as a signalling molecule and a counter-ion of potassium, a well-established osmolyte that accumulates in the vacuole of guard cells during stomatal opening. By contrast, their efflux from guard cells is an important mechanism during stomatal closure. It has been hypothesized that the breakdown of starch, sucrose and lipids is an important mechanism during stomatal opening, which may be related to ATP production through glycolysis and mitochondrial metabolism, and/or accumulation of osmolytes such as sugars and malate. However, experimental evidence supporting this theory is lacking. Here we highlight the particularities of guard cell metabolism and discuss this in the context of the guard cells themselves and their interaction with the mesophyll cells.
Collapse
Affiliation(s)
- Danilo M Daloso
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, Fortaleza, Ceará, 60451-970, Brasil
| | - David B Medeiros
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, Potsdam-Golm, 14476, Germany
- Max-Planck Partner Group at the Departamento de Biologia Vegetal, Universidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brasil
| | - Letícia Dos Anjos
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, Fortaleza, Ceará, 60451-970, Brasil
| | - Takuya Yoshida
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, Potsdam-Golm, 14476, Germany
| | - Wagner L Araújo
- Max-Planck Partner Group at the Departamento de Biologia Vegetal, Universidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brasil
| | - Alisdair R Fernie
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, Potsdam-Golm, 14476, Germany
| |
Collapse
|
54
|
Shen JL, Li CL, Wang M, He LL, Lin MY, Chen DH, Zhang W. Mitochondrial pyruvate carrier 1 mediates abscisic acid-regulated stomatal closure and the drought response by affecting cellular pyruvate content in Arabidopsis thaliana. BMC PLANT BIOLOGY 2017; 17:217. [PMID: 29166881 PMCID: PMC5700692 DOI: 10.1186/s12870-017-1175-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Accepted: 11/13/2017] [Indexed: 05/20/2023]
Abstract
BACKGROUND Stomata are micropores surrounded by pairs of guard cells, and their opening is finely controlled to balance water vapor loss as transpiration and CO2 absorption for photosynthesis. The regulatory signaling network for stomatal movement is complicated, and increasing numbers of new genes have been shown to be involved in this process. Our previous study indicated that a member of the plant putative mitochondrial pyruvate carrier (MPC) family, NRGA1, is a negative regulator of guard cell abscisic acid (ABA) signaling. In this study, we identified novel physiological roles of pyruvate and MPC1, another member of the MPC family, in the regulation of stomatal closure in Arabidopsis. RESULTS Loss-of-function mutants of MPC1 (mpc1) were hypersensitive to ABA-induced stomatal closure and ABA-activated guard cell slow-type anion currents, and showed a reduced rate of water loss upon drought treatment compared with wild-type plants. In contrast, plants overexpressing MPC1 showed a hyposensitive ABA response and increased sensitivity to drought stress. In addition, mpc1 mutants accumulated more pyruvate after drought or ABA treatment. The increased pyruvate content also induced stomatal closure and activated the slow-type anion channels of guard cells, and this process was dependent on the function of RbohD/F NADPH oxidases and reactive oxygen species concentrations in guard cells. CONCLUSIONS Our findings revealed the essential roles of MPC1 and pyruvate in stomatal movement and plant drought resistance.
Collapse
Affiliation(s)
- Jian-Lin Shen
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, 250100 China
| | - Chun-Long Li
- College of Life Science, Jiangsu Normal University, Xuzhou, 221116 China
| | - Mei Wang
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, 250100 China
| | - Li-Long He
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, 250100 China
| | - Min-Yan Lin
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, 250100 China
| | - Dong-Hua Chen
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, 250100 China
| | - Wei Zhang
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, 250100 China
| |
Collapse
|
55
|
Robaina-Estévez S, Daloso DM, Zhang Y, Fernie AR, Nikoloski Z. Resolving the central metabolism of Arabidopsis guard cells. Sci Rep 2017; 7:8307. [PMID: 28814793 PMCID: PMC5559522 DOI: 10.1038/s41598-017-07132-9] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 06/23/2017] [Indexed: 12/22/2022] Open
Abstract
Photosynthesis and water use efficiency, key factors affecting plant growth, are directly controlled by microscopic and adjustable pores in the leaf-the stomata. The size of the pores is modulated by the guard cells, which rely on molecular mechanisms to sense and respond to environmental changes. It has been shown that the physiology of mesophyll and guard cells differs substantially. However, the implications of these differences to metabolism at a genome-scale level remain unclear. Here, we used constraint-based modeling to predict the differences in metabolic fluxes between the mesophyll and guard cells of Arabidopsis thaliana by exploring the space of fluxes that are most concordant to cell-type-specific transcript profiles. An independent 13C-labeling experiment using isolated mesophyll and guard cells was conducted and provided support for our predictions about the role of the Calvin-Benson cycle in sucrose synthesis in guard cells. The combination of in silico with in vivo analyses indicated that guard cells have higher anaplerotic CO2 fixation via phosphoenolpyruvate carboxylase, which was demonstrated to be an important source of malate. Beyond highlighting the metabolic differences between mesophyll and guard cells, our findings can be used in future integrated modeling of multi-cellular plant systems and their engineering towards improved growth.
Collapse
Affiliation(s)
- Semidán Robaina-Estévez
- Systems Biology and Mathematical Modeling Group, Max Planck Institute of Molecular Plant Physiology, Potsdam, Golm, Germany
- Bioinformatics Group, Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Golm, Germany
| | - Danilo M Daloso
- Central Metabolism Group, Max Planck Institute of Molecular Plant Physiology, Potsdam, Golm, Germany
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, Fortaleza, CE, Brazil
| | - Youjun Zhang
- Central Metabolism Group, Max Planck Institute of Molecular Plant Physiology, Potsdam, Golm, Germany
| | - Alisdair R Fernie
- Central Metabolism Group, Max Planck Institute of Molecular Plant Physiology, Potsdam, Golm, Germany
| | - Zoran Nikoloski
- Systems Biology and Mathematical Modeling Group, Max Planck Institute of Molecular Plant Physiology, Potsdam, Golm, Germany.
- Bioinformatics Group, Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Golm, Germany.
| |
Collapse
|
56
|
Kelly G, Sade N, Doron-Faigenboim A, Lerner S, Shatil-Cohen A, Yeselson Y, Egbaria A, Kottapalli J, Schaffer AA, Moshelion M, Granot D. Sugar and hexokinase suppress expression of PIP aquaporins and reduce leaf hydraulics that preserves leaf water potential. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2017; 91:325-339. [PMID: 28390076 DOI: 10.1111/tpj.13568] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2017] [Revised: 04/03/2017] [Accepted: 04/03/2017] [Indexed: 05/27/2023]
Abstract
Sugars affect central aspects of plant physiology, including photosynthesis, stomatal behavior and the loss of water through the stomata. Yet, the potential effects of sugars on plant aquaporins (AQPs) and water conductance have not been examined. We used database and transcriptional analyses, as well as cellular and whole-plant functional techniques to examine the link between sugar-related genes and AQPs. Database analyses revealed a high level of correlation between the expression of AQPs and that of sugar-related genes, including the Arabidopsis hexokinases 1 (AtHXK1). Increased expression of AtHXK1, as well as the addition of its primary substrate, glucose (Glc), repressed the expression of 10 AQPs from the plasma membrane-intrinsic proteins (PIP) subfamily (PIP-AQPs) and induced the expression of two stress-related PIP-AQPs. The osmotic water permeability of mesophyll protoplasts of AtHXK1-expressing plants and the leaf hydraulic conductance of those plants were significantly reduced, in line with the decreased expression of PIP-AQPs. Conversely, hxk1 mutants demonstrated a higher level of hydraulic conductance, with increased water potential in their leaves. In addition, the presence of Glc reduced leaf water potential, as compared with an osmotic control, indicating that Glc reduces the movement of water from the xylem into the mesophyll. The production of sugars entails a significant loss of water and these results suggest that sugars and AtHXK1 affect the expression of AQP genes and reduce leaf water conductance, to coordinate sugar levels with the loss of water through transpiration.
Collapse
Affiliation(s)
- Gilor Kelly
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, 7505101, Israel
| | - Nir Sade
- The Institute of Plant Sciences and Genetics in Agriculture, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, 76100, Israel
| | - Adi Doron-Faigenboim
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, 7505101, Israel
| | - Stephen Lerner
- The Institute of Plant Sciences and Genetics in Agriculture, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, 76100, Israel
| | - Arava Shatil-Cohen
- The Institute of Plant Sciences and Genetics in Agriculture, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, 76100, Israel
| | - Yelena Yeselson
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, 7505101, Israel
| | - Aiman Egbaria
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, 7505101, Israel
| | - Jayaram Kottapalli
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, 7505101, Israel
| | - Arthur A Schaffer
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, 7505101, Israel
| | - Menachem Moshelion
- The Institute of Plant Sciences and Genetics in Agriculture, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, 76100, Israel
| | - David Granot
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, 7505101, Israel
| |
Collapse
|
57
|
Kelly G, Lugassi N, Belausov E, Wolf D, Khamaisi B, Brandsma D, Kottapalli J, Fidel L, Ben-Zvi B, Egbaria A, Acheampong AK, Zheng C, Or E, Distelfeld A, David-Schwartz R, Carmi N, Granot D. The Solanum tuberosum KST1 partial promoter as a tool for guard cell expression in multiple plant species. JOURNAL OF EXPERIMENTAL BOTANY 2017; 68:2885-2897. [PMID: 28531314 PMCID: PMC5853950 DOI: 10.1093/jxb/erx159] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 04/19/2017] [Indexed: 05/10/2023]
Abstract
To date, guard cell promoters have been examined in only a few species, primarily annual dicots. A partial segment of the potato (Solanum tuberosum) KST1 promoter (KST1 partial promoter, KST1ppro) has previously been shown to confer guard cell expression in potato, tomato (Solanum lycopersicum), citrus [Troyer citrange (C. sinensis×Poncirus trifoliata)], and Arabidopsis (Arabidopsis thaliana). Here, we describe an extensive analysis of the expression pattern of KST1ppro in eight (previously reported, as well as new) species from five different angiosperm families, including the Solanaceae and the Cucurbitaceae, Arabidopsis, the monocot barley (Hordeum vulgare), and two perennial species: grapevine (Vitis vinifera) and citrus. Using confocal imaging and three-dimensional movies, we demonstrate that KST1ppro drives guard cell expression in all of these species, making it the first dicot-originated guard cell promoter shown to be active in a monocot and the first promoter reported to confer guard cell expression in barley and cucumber (Cucumis sativus). The results presented here indicate that KST1ppro can be used to drive constitutive guard cell expression in monocots and dicots and in both annual and perennial plants. In addition, we show that the KST1ppro is active in guard cells shortly after the symmetric division of the guard mother cell and generates stable expression in mature guard cells. This allows us to follow the spatial and temporal distribution of stomata in cotyledons and true leaves.
Collapse
Affiliation(s)
- Gilor Kelly
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Nitsan Lugassi
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Eduard Belausov
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Dalia Wolf
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Belal Khamaisi
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Danja Brandsma
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
- Horticulture and Product Physiology, Wageningen University, AP Wageningen, The Netherlands
| | - Jayaram Kottapalli
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Lena Fidel
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Batsheva Ben-Zvi
- Faculty of Life Sciences, Department of Molecular Biology and Ecology of Plants, Tel Aviv University, Israel
| | - Aiman Egbaria
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Atiako Kwame Acheampong
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Chuanlin Zheng
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Etti Or
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Assaf Distelfeld
- Faculty of Life Sciences, Department of Molecular Biology and Ecology of Plants, Tel Aviv University, Israel
| | - Rakefet David-Schwartz
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - Nir Carmi
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| | - David Granot
- Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Rishon LeZion, Israel
| |
Collapse
|
58
|
Ribeiro RV, Machado EC, Magalhães Filho JR, Lobo AKM, Martins MO, Silveira JAG, Yin X, Struik PC. Increased sink strength offsets the inhibitory effect of sucrose on sugarcane photosynthesis. JOURNAL OF PLANT PHYSIOLOGY 2017; 208:61-69. [PMID: 27889522 DOI: 10.1016/j.jplph.2016.11.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 09/29/2016] [Accepted: 11/14/2016] [Indexed: 06/06/2023]
Abstract
Spraying sucrose inhibits photosynthesis by impairing Rubisco activity and stomatal conductance (gs), whereas increasing sink demand by partially darkening the plant stimulates sugarcane photosynthesis. We hypothesized that the stimulatory effect of darkness can offset the inhibitory effect of exogenous sucrose on photosynthesis. Source-sink relationship was perturbed in two sugarcane cultivars by imposing partial darkness, spraying a sucrose solution (50mM) and their combination. Five days after the onset of the treatments, the maximum Rubisco carboxylation rate (Vcmax) and the initial slope of A-Ci curve (k) were estimated by measuring leaf gas exchange and chlorophyll fluorescence. Photosynthesis was inhibited by sucrose spraying in both genotypes, through decreases in Vcmax, k, gs and ATP production driven by electron transport (Jatp). Photosynthesis of plants subjected to the combination of partial darkness and sucrose spraying was similar to photosynthesis of reference plants for both genotypes. Significant increases in Vcmax, gs and Jatp and marginal increases in k were noticed when combining partial darkness and sucrose spraying compared with sucrose spraying alone. Our data also revealed that increases in sink strength due to partial darkness offset the inhibition of sugarcane photosynthesis caused by sucrose spraying, enhancing the knowledge on endogenous regulation of sugarcane photosynthesis through the source-sink relationship.
Collapse
Affiliation(s)
- Rafael V Ribeiro
- Department of Plant Biology, Institute of Biology, University of Campinas, Campinas, SP, Brazil.
| | - Eduardo C Machado
- Laboratory of Plant Physiology "Coaracy M. Franco", Centre for Research and Development in Ecophysiology and Biophysics, Agronomic Institute, Campinas, SP, Brazil.
| | - José R Magalhães Filho
- Laboratory of Plant Physiology "Coaracy M. Franco", Centre for Research and Development in Ecophysiology and Biophysics, Agronomic Institute, Campinas, SP, Brazil.
| | - Ana Karla M Lobo
- Department of Biochemistry and Molecular Biology, Federal University of Ceará, Fortaleza, CE, Brazil.
| | - Márcio O Martins
- Department of Biochemistry and Molecular Biology, Federal University of Ceará, Fortaleza, CE, Brazil.
| | - Joaquim A G Silveira
- Department of Biochemistry and Molecular Biology, Federal University of Ceará, Fortaleza, CE, Brazil.
| | - Xinyou Yin
- Centre for Crop Systems Analysis, Department of Plant Sciences, Wageningen University & Research, Wageningen, The Netherlands.
| | - Paul C Struik
- Centre for Crop Systems Analysis, Department of Plant Sciences, Wageningen University & Research, Wageningen, The Netherlands.
| |
Collapse
|
59
|
Geng S, Misra BB, de Armas E, Huhman DV, Alborn HT, Sumner LW, Chen S. Jasmonate-mediated stomatal closure under elevated CO 2 revealed by time-resolved metabolomics. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2016; 88:947-962. [PMID: 27500669 DOI: 10.1111/tpj.13296] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Accepted: 08/01/2016] [Indexed: 05/18/2023]
Abstract
Foliar stomatal movements are critical for regulating plant water loss and gas exchange. Elevated carbon dioxide (CO2 ) levels are known to induce stomatal closure. However, the current knowledge on CO2 signal transduction in stomatal guard cells is limited. Here we report metabolomic responses of Brassica napus guard cells to elevated CO2 using three hyphenated metabolomics platforms: gas chromatography-mass spectrometry (MS); liquid chromatography (LC)-multiple reaction monitoring-MS; and ultra-high-performance LC-quadrupole time-of-flight-MS. A total of 358 metabolites from guard cells were quantified in a time-course response to elevated CO2 level. Most metabolites increased under elevated CO2 , showing the most significant differences at 10 min. In addition, reactive oxygen species production increased and stomatal aperture decreased with time. Major alterations in flavonoid, organic acid, sugar, fatty acid, phenylpropanoid and amino acid metabolic pathways indicated changes in both primary and specialized metabolic pathways in guard cells. Most interestingly, the jasmonic acid (JA) biosynthesis pathway was significantly altered in the course of elevated CO2 treatment. Together with results obtained from JA biosynthesis and signaling mutants as well as CO2 signaling mutants, we discovered that CO2 -induced stomatal closure is mediated by JA signaling.
Collapse
Affiliation(s)
- Sisi Geng
- Plant Molecular and Cellular Biology Program, University of Florida, Gainesville, FL, 32610, USA
- Department of Biology, Genetics Institute, University of Florida, Gainesville, FL, 32610, USA
| | - Biswapriya B Misra
- Department of Biology, Genetics Institute, University of Florida, Gainesville, FL, 32610, USA
| | - Evaldo de Armas
- Thermo Fisher Scientific, 1400 Northpoint Parkway, West Palm Beach, FL, 33407, USA
| | - David V Huhman
- Samuel Roberts Noble Foundation, Ardmore, OK, 73401, USA
| | - Hans T Alborn
- Chemistry Research Unit, Agricultural Research Service, United States Department of Agriculture, Gainesville, FL, 32608, USA
| | - Lloyd W Sumner
- Samuel Roberts Noble Foundation, Ardmore, OK, 73401, USA
| | - Sixue Chen
- Plant Molecular and Cellular Biology Program, University of Florida, Gainesville, FL, 32610, USA
- Department of Biology, Genetics Institute, University of Florida, Gainesville, FL, 32610, USA
- Proteomics and Mass Spectrometry, Interdisciplinary Center for Biotechnology Research, University of Florida, Gainesville, FL, 32610, USA
| |
Collapse
|