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Ito K, Sugawara S, Kageyama S, Sawaguchi N, Hyotani T, Miyazawa SI, Makino A, Suzuki Y. Equisetum praealtum and E. hyemale have abundant Rubisco with a high catalytic turnover rate and low CO 2 affinity. JOURNAL OF PLANT RESEARCH 2024; 137:255-264. [PMID: 38112982 DOI: 10.1007/s10265-023-01514-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Accepted: 12/01/2023] [Indexed: 12/21/2023]
Abstract
The kinetic properties of Rubisco, a key enzyme for photosynthesis, have been examined in numerous plant species. However, this information on some plant groups, such as ferns, is scarce. This study examined Rubisco carboxylase activity and leaf Rubisco levels in seven ferns, including four Equisetum plants (E. arvense, E. hyemale, E. praealtum, and E. variegatum), considered living fossils. The turnover rates of Rubisco carboxylation (kcatc) in E. praealtum and E. hyemale were comparable to those in the C4 plants maize (Zea mays) and sorghum (Sorghum bicolor), whose kcatc values are high. Rubisco CO2 affinity, estimated from the percentage of Rubisco carboxylase activity under CO2 unsaturated conditions in kcatc in these Equisetum plants, was low and also comparable to that in maize and sorghum. In contrast, kcatc and CO2 affinities of Rubisco in other ferns, including E. arvense and E. variegatum were comparable with those in C3 plants. The N allocation to Rubisco in the ferns examined was comparable to that in the C3 plants. These results indicate that E. praealtum and E. hyemale have abundant Rubisco with high kcatc and low CO2 affinity, whereas the carboxylase activity and abundance of Rubisco in other ferns were similar to those in C3 plants. Herein, the Rubisco properties of E. praealtum and E. hyemale were discussed regarding their evolution and physiological implications.
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Affiliation(s)
- Kana Ito
- Graduate School of Arts and Sciences, Iwate University, Morioka, Japan
| | | | - Sota Kageyama
- Faculty of Agriculture, Iwate University, Morioka, Japan
| | - Naoki Sawaguchi
- Graduate School of Arts and Sciences, Iwate University, Morioka, Japan
| | - Takuro Hyotani
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | | | - Amane Makino
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
- Present address: Institute for Excellence in Higher Education, Tohoku University, Sendai, Japan
| | - Yuji Suzuki
- Faculty of Agriculture, Iwate University, Morioka, Japan.
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Gurung K, Field KJ, Batterman SA, Poulton SW, Mills BJW. Geographic range of plants drives long-term climate change. Nat Commun 2024; 15:1805. [PMID: 38418475 PMCID: PMC10901853 DOI: 10.1038/s41467-024-46105-1] [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: 05/22/2023] [Accepted: 02/14/2024] [Indexed: 03/01/2024] Open
Abstract
Long computation times in vegetation and climate models hamper our ability to evaluate the potentially powerful role of plants on weathering and carbon sequestration over the Phanerozoic Eon. Simulated vegetation over deep time is often homogenous, and disregards the spatial distribution of plants and the impact of local climatic variables on plant function. Here we couple a fast vegetation model (FLORA) to a spatially-resolved long-term climate-biogeochemical model (SCION), to assess links between plant geographical range, the long-term carbon cycle and climate. Model results show lower rates of carbon fixation and up to double the previously predicted atmospheric CO2 concentration due to a limited plant geographical range over the arid Pangea supercontinent. The Mesozoic dispersion of the continents increases modelled plant geographical range from 65% to > 90%, amplifying global CO2 removal, consistent with geological data. We demonstrate that plant geographical range likely exerted a major, under-explored control on long-term climate change.
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Affiliation(s)
- Khushboo Gurung
- School of Earth and Environment, University of Leeds, Leeds, UK.
| | - Katie J Field
- Plants, Photosynthesis and Soil, School of Biosciences, University of Sheffield, Sheffield, UK
| | - Sarah A Batterman
- Cary Institute of Ecosystem Studies, Millbrook, NY, USA
- School of Geography, University of Leeds, Leeds, UK
- Smithsonian Tropical Research Institute, Panama City, Panama, USA
| | - Simon W Poulton
- School of Earth and Environment, University of Leeds, Leeds, UK
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Pohl A, Stockey RG, Dai X, Yohler R, Le Hir G, Hülse D, Brayard A, Finnegan S, Ridgwell A. Why the Early Paleozoic was intrinsically prone to marine extinction. SCIENCE ADVANCES 2023; 9:eadg7679. [PMID: 37647393 PMCID: PMC10468122 DOI: 10.1126/sciadv.adg7679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 05/26/2023] [Accepted: 07/27/2023] [Indexed: 09/01/2023]
Abstract
The geological record of marine animal biodiversity reflects the interplay between changing rates of speciation versus extinction. Compared to mass extinctions, background extinctions have received little attention. To disentangle the different contributions of global climate state, continental configuration, and atmospheric oxygen concentration (pO2) to variations in background extinction rates, we drive an animal physiological model with the environmental outputs from an Earth system model across intervals spanning the past 541 million years. We find that climate and continental configuration combined to make extinction susceptibility an order of magnitude higher during the Early Paleozoic than during the rest of the Phanerozoic, consistent with extinction rates derived from paleontological databases. The high extinction susceptibility arises in the model from the limited geographical range of marine organisms. It stands even when assuming present-day pO2, suggesting that increasing oxygenation through the Paleozoic is not necessary to explain why extinction rates apparently declined with time.
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Affiliation(s)
- Alexandre Pohl
- Biogéosciences, UMR 6282 CNRS, Université de Bourgogne, 6 Boulevard Gabriel, 21000 Dijon, France
| | - Richard G. Stockey
- School of Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton, UK
| | - Xu Dai
- Biogéosciences, UMR 6282 CNRS, Université de Bourgogne, 6 Boulevard Gabriel, 21000 Dijon, France
| | - Ryan Yohler
- Department of Integrative Biology, University of California, Berkeley, Berkeley, CA, USA
| | - Guillaume Le Hir
- Université de Paris, Institut de Physique du Globe de Paris, CNRS, 1 rue Jussieu, 75005 Paris, France
| | - Dominik Hülse
- Max-Planck-Institute for Meteorology, Hamburg, Germany
- Department of Earth and Planetary Sciences, University of California, Riverside, CA, USA
| | - Arnaud Brayard
- Biogéosciences, UMR 6282 CNRS, Université de Bourgogne, 6 Boulevard Gabriel, 21000 Dijon, France
| | - Seth Finnegan
- Department of Integrative Biology, University of California, Berkeley, Berkeley, CA, USA
| | - Andy Ridgwell
- Department of Earth and Planetary Sciences, University of California, Riverside, CA, USA
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Yu Q, Wang X, Wu W, Feng X, Kong D, Khan U, Ren X, Li L. In Situ Encapsulation of Graphene Quantum Dots in Highly Stable Porphyrin Metal-Organic Frameworks for Efficient Photocatalytic CO 2 Reduction. Molecules 2023; 28:4703. [PMID: 37375258 DOI: 10.3390/molecules28124703] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 06/01/2023] [Accepted: 06/10/2023] [Indexed: 06/29/2023] Open
Abstract
Photocatalytic CO2 reduction to valuable hydrocarbon solar fuel is of great significance but still challenging. Strong CO2 enrichment ability and easily adjustable structures make metal-organic frameworks (MOFs) potential photocatalysts for CO2 conversion. Even though pure MOFs have the potential for photoreduction of CO2, the efficiency is still quite low due to rapid photogenerated electron-hole recombination and other drawbacks. In this work, graphene quantum dots (GQDs) were in situ encapsulated into highly stable MOFs via a solvothermal method for this challenging task. The GQDs@PCN-222 with encapsulated GQDs showed similar Powder X-ray Diffraction (PXRD) patterns to PCN-222, indicating the retained structure. The porous structure was also retained with a Brunauer-Emmett-Teller (BET) surface area of 2066 m2/g. After incorporation of GQDs, the shape of GQDs@PCN-222 particles remained, as revealed by the scanning electron microscope (SEM). As most of the GQDs were covered by thick PCN-222, it was hard to observe those GQDs using a transmission electron microscope (TEM) and a high-resolution transmission electron microscope (HRTEM) directly, the treatment of digested GQDs@PCN-222 particles by immersion in a 1 mM aqueous KOH solution can make the incorporated GQDs visible in TEM and HRTEM. The linker, deep purple porphyrins, make MOFs a highly visible light harvester up to 800 nm. The introduction of GQDs inside PCN-222 can effectively promote the spatial separation of the photogenerated electron-hole pairs during the photocatalytic process, which was proved by the transient photocurrent plot and photoluminescence emission spectra. Compared with pure PCN-222, the obtained GQDs@PCN-222 displayed dramatically enhanced CO production derived from CO2 photoreduction with 147.8 μmol/g/h in a 10 h period under visible light irradiation with triethanolamine (TEOA) as a sacrificial agent. This study demonstrated that the combination of GQDs and high light absorption MOFs provides a new platform for photocatalytic CO2 reduction.
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Affiliation(s)
- Qin Yu
- Institute of Functional Porous Materials, School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Xusheng Wang
- Institute of Functional Porous Materials, School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
- Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Jinan University, Guangzhou 510632, China
- Tongxiang Research Institute, Zhejiang Sci-Tech University, Jiaxing 314500, China
- Zhejiang LINIX Motor Co., Ltd., Jinhua 322118, China
| | - Wenbin Wu
- Institute of Functional Porous Materials, School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Xinya Feng
- Institute of Functional Porous Materials, School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Deyu Kong
- Institute of Functional Porous Materials, School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Usman Khan
- Institute of Functional Porous Materials, School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Xiaohui Ren
- The State Key Laboratory of Refractories and Metallurgy, School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
| | - Lan Li
- College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, China
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