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| Photosynthesis | |
|---|---|
| Name | Photosynthesis |
| Organism | Plants, algae, cyanobacteria |
| Products | Glucose, oxygen |
| Reactants | Carbon dioxide, water, light |
Photosynthesis is the biochemical process by which photoautotrophic organisms convert light energy into chemical energy, producing organic compounds and oxygen; it underpins the biosphere and links to the histories of Charles Darwin, Alexander von Humboldt, Carl Linnaeus, Gregor Mendel, and Antoine Lavoisier through exploration, classification, genetics, and chemistry. The process is central to ecosystems studied by researchers at institutions such as the Royal Society, Max Planck Society, Smithsonian Institution, Kew Gardens, and Salk Institute, and it influences global frameworks including the Intergovernmental Panel on Climate Change, the Paris Agreement, the United Nations, and the Convention on Biological Diversity.
Photosynthetic organisms include vascular plants, nonvascular Bryophytes, algae studied in collections at Scripps Institution of Oceanography and Natural History Museum, and cyanobacteria researched by laboratories at MIT, Caltech, University of California, Berkeley, Stanford University, and University of Cambridge. Primary pigments such as chlorophyll were characterized in work linked to Joseph Priestley, Jan Ingenhousz, Theodore Engelmann, Robert Hill, Melvin Calvin, and Otto Warburg; modern analyses use instrumentation from companies like Thermo Fisher Scientific and facilities such as European Molecular Biology Laboratory and Lawrence Berkeley National Laboratory. Photosynthesis connects to global cycles discussed at NASA, NOAA, European Space Agency, and in field research at Amazon Rainforest, Great Barrier Reef, Sahara Desert, Taiga, and Serengeti.
The overall stoichiometry and thermodynamics of light-driven carbon assimilation were elucidated through collaborations among chemists and biochemists influenced by Antoine Lavoisier, Julius Robert Mayer, Svante Arrhenius, Wilhelm Pfeffer, and laboratories at The Rockefeller University, Weizmann Institute of Science, University of Oxford, Max Planck Institute for Biophysical Chemistry, and Cold Spring Harbor Laboratory. Pathways involve pigment–protein complexes, electron transport chains, ATP synthase, and carbon fixation enzymes; structural biology approaches from groups at European Synchrotron Radiation Facility, Diamond Light Source, Brookhaven National Laboratory, Francis Crick Institute, and Riken provided high-resolution models. Enzymes such as Rubisco were characterized in seminal work at Carnegie Institution for Science, Duke University, University of Chicago, University of California, Davis, and ETH Zurich.
Light capture and photochemistry occur in membrane-bound complexes—photosystem I and photosystem II—whose discovery and characterization involved researchers linked to Robert Hill, Melvin Calvin, John Walker (biochemist), Ada Yonath, and institutions like University of Cambridge, University of Edinburgh, Columbia University, Princeton University, and University of Tokyo. Photons absorbed by chlorophyll and accessory pigments drive charge separation, water-splitting at the oxygen-evolving complex, and proton gradients used by ATP synthase; spectroscopic and cryo-EM studies by teams at Max Planck Institute for Chemical Energy Conversion, Caltech, Harvard University, University of Basel, and Imperial College London advanced mechanistic understanding. Artificial photosynthesis and photovoltaic analogues are pursued by consortia including Energy Department (United States Department of Energy), European Commission Horizon 2020, Bill & Melinda Gates Foundation, Bill Nye, and industry partners such as Siemens and Toyota.
The Calvin–Benson–Bassham cycle, elucidated through experiments at Lawrence Berkeley National Laboratory, University of California, Berkeley, Brookhaven National Laboratory, University of California, Los Angeles, and Scripps Research, uses ATP and NADPH to convert CO2 into triose phosphates via Rubisco and ancillary enzymes; Nobel-recognized work by Melvin Calvin links to archival collections at University of California, Berkeley. Biochemical regulation, photorespiration, and interactions with metabolic networks have been studied in model organisms maintained by Arabidopsis Biological Resource Center, Carnegie Institution for Science, Max Planck Institute for Plant Breeding Research, John Innes Centre, and Boyce Thompson Institute.
Diverse photosynthetic strategies—C3, C4, CAM, and anoxygenic photosynthesis—are distributed among lineages including Poaceae grasses, Crassulaceae, Euphorbiaceae, C4 plants, cyanobacteria, purple sulfur bacteria, and algal groups curated at Marine Biological Laboratory, Woods Hole Oceanographic Institution, California Academy of Sciences, and Australian Institute of Marine Science. Evolutionary adaptations such as Kranz anatomy, stomatal regulation, and diel acid fluctuation were described in ecological and physiological studies at USDA, CSIRO, INRAE, University of São Paulo, and Chinese Academy of Sciences.
Hypotheses about the origin of oxygenic photosynthesis and endosymbiosis of plastids connect work by Lynn Margulis, Wallace S. Broecker, James Lovelock, Carl Woese, and fossil evidence from formations like the Gunflint Iron Formation and Bitter Springs Formation; geological and isotopic datasets from US Geological Survey, Geological Survey of Canada, Australian National University, Oxford University Museum of Natural History, and Smithsonian Institution inform timing and environmental context. Molecular phylogenetics from groups at Wellcome Sanger Institute, Joint Genome Institute, European Bioinformatics Institute, Broad Institute, and National Center for Biotechnology Information trace plastid origins and horizontal gene transfer events across eukaryotic and prokaryotic lineages.
Photosynthesis drives primary productivity that supports food webs in biomes such as the Amazon Rainforest, Great Barrier Reef, African Savanna, Boreal Forests of Canada, and Antarctic Peninsula and influences atmospheric composition, carbon sequestration, and climate systems studied by Intergovernmental Panel on Climate Change, NASA Goddard Institute for Space Studies, NOAA, European Centre for Medium-Range Weather Forecasts, and IPBES. Agricultural productivity, bioenergy, and ecosystem services link photosynthetic efficiency to policy and innovation efforts at Food and Agriculture Organization, World Resources Institute, International Rice Research Institute, CIMMYT, and renewable-energy initiatives supported by European Investment Bank and Global Environment Facility.