Photosynthesis is a system of biological processes by which photosynthetic organisms, such as most plants, algae, and cyanobacteria, convert light energy, typically from sunlight, into the chemical energy necessary to fuel their activities. Photosynthetic organisms use intracellular organic compounds to store the chemical energy they produce in photosynthesis within organic compounds like sugars, glycogen, cellulose and starches. Photosynthesis is usually used to refer to oxygenic photosynthesis, a process that produces oxygen. To use this stored chemical energy, the organisms' cells metabolize the organic compounds through another process called cellular respiration. Photosynthesis plays a critical role in producing and maintaining the oxygen content of the Earth's atmosphere, and it supplies most of the biological energy necessary for complex life on Earth.
Crassulacean acid metabolism, also known as CAM photosynthesis, is a carbon fixation pathway that evolved in some plants as an adaptation to arid conditions that allows a plant to photosynthesize during the day, but only exchange gases at night. In a plant using full CAM, the stomata in the leaves remain shut during the day to reduce evapotranspiration, but they open at night to collect carbon dioxide and allow it to diffuse into the mesophyll cells. The CO2 is stored as four-carbon malic acid in vacuoles at night, and then in the daytime, the malate is transported to chloroplasts where it is converted back to CO2, which is then used during photosynthesis. The pre-collected CO2 is concentrated around the enzyme RuBisCO, increasing photosynthetic efficiency. This mechanism of acid metabolism was first discovered in plants of the family Crassulaceae.
The University of Wollongong (UOW) is an Australian public research university located in the coastal city of Wollongong, New South Wales, approximately 80 kilometres south of Sydney. As of 2023, the university had an enrolment of more than 33,000 students, an alumni base of more than 176,000 [LC1] and over 2,400 staff members including 16 Distinguished professors.
Photorespiration (also known as the oxidative photosynthetic carbon cycle or C2 cycle) refers to a process in plant metabolism where the enzyme RuBisCO oxygenates RuBP, wasting some of the energy produced by photosynthesis. The desired reaction is the addition of carbon dioxide to RuBP (carboxylation), a key step in the Calvin–Benson cycle, but approximately 25% of reactions by RuBisCO instead add oxygen to RuBP (oxygenation), creating a product that cannot be used within the Calvin–Benson cycle. This process lowers the efficiency of photosynthesis, potentially lowering photosynthetic output by 25% in C3 plants. Photorespiration involves a complex network of enzyme reactions that exchange metabolites between chloroplasts, leaf peroxisomes and mitochondria.
Nitrogen assimilation is the formation of organic nitrogen compounds like amino acids from inorganic nitrogen compounds present in the environment. Organisms like plants, fungi and certain bacteria that can fix nitrogen gas (N2) depend on the ability to assimilate nitrate or ammonia for their needs. Other organisms, like animals, depend entirely on organic nitrogen from their food.
Anthony James Trewavas FRS FRSE is Emeritus Professor in the School of Biological Sciences of the University of Edinburgh best known for his research in the fields of plant physiology and molecular biology. His research investigates plant behaviour.
Sharon Beder is an environmentalist and former professor in the Faculty of Arts at the University of Wollongong in New South Wales, Australia. Her research has focused on how power relationships are maintained and challenged, particularly by corporations and professions. She has written 11 books, and many articles, book chapters and conference papers, as well as designing teaching resources and educational websites.
In enzymology, 4-aminobutyrate transaminase, also called GABA transaminase or 4-aminobutyrate aminotransferase, or GABA-T, is an enzyme that catalyzes the chemical reaction:
Marilyn Ball is a professor at the College of Medicine, Biology and Environment at the Australian National University (ANU), and leader of the Ball (Marilyn) Lab for Ecophysiology of Salinity and Freezing Tolerance.
Christine Helen Foyer is professor of plant science at the University of Birmingham, Birmingham, UK. She is President Elect of the Association of Applied Biologists, the General Secretary of the Federation of European Societies of Plant Biologists, an elected Board Member of the American Society of Plant Biologists and a Member of the French Academy of Agriculture. She has published and co-authored many papers on related subjects.
Steven M. Smith is Emeritus Professor of Plant Genetics and Biochemistry at the University of Tasmania in Australia and Chief Investigator in the Australian Research Council Centre of Excellence for Plant Success in Nature and Agriculture.
Barbara Wienecke is a senior research scientist with the Australian Antarctic Division. She is a seabird ecologist who uses satellite tracking to investigate seabird population dynamics and ecology. Wienecke has played a key role in enhancing the quality of, and overseeing the implementation of, a number of Antarctic Specially Protected Area management plans for wildlife concentrations in East Antarctica.
Catherine K. King is an Australian ecotoxicologist who studies sub-Antarctic and Antarctic regions, with a focus on climate change and the impacts of contaminants and environmental stressors in terrestrial and marine ecosystems.
Susanne von Caemmerer FRS is a professor and plant physiologist in the Division of Plant Sciences, Research School of Biology at the Australian National University; and the Deputy Director of the ARC Centre of Excellence for Translational Photosynthesis. She has been a leader in developing and refining biochemical models of photosynthesis.
Thomas D. Sharkey is a plant biochemist who studies gas exchange between plants and the atmosphere. His research has covered (1) carbon metabolism of photosynthesis from carbon dioxide uptake to carbon export from the Calvin-Benson Cycle, (2) isoprene emission from plants, and (3) abiotic stress tolerance. Four guiding questions are: (1) how leaf photosynthesis affects plant yield, (2) does some carbon fixation follow an oxidative pathway that reduces sugar output but stabilizes photosynthesis, (3) why plants make isoprene, and (4) how plants cope with high temperature.
Dr. Natalie Matosin is an Australian scientist known for research into the impacts of the human brain in health and disease, and particularly stress and its role in mental illness. Matosin's research has been published in prestigious academic journals, as well as on The Conversation. Matosin spoke at TEDx Hamburg in June 2017 and is the 2021 Al & Val Rosenstrauss Fellow. She was previously a National Health and Medical Research Council CJ Martin Early Career Research Fellow, and Alexander von Humboldt Fellow. In 2017, Matosin was listed as a Forbes 30 Under 30 in Europe in the category of Science & Healthcare, placing her in the top 1% of innovators worldwide.
Christoph Benning is a German–American plant biologist. He is an MSU Foundation Professor and University Distinguished Professor at Michigan State University. Benning's research into lipid metabolism in plants, algae and photosynthetic bacteria, led him to be named Editor-in-Chief of The Plant Journal in October 2008.
Lezanne Ooi is an Australian neuroscientist who is Professor and Head of Neurodevelopment at the University of Wollongong. Her research considers the development of cellular imaging techniques to understand neurodegenerative disease.
Barbara Anne Bollard also known as Barbara Breen and Bollard-Breen, is a New Zealand academic, and is a full professor at Auckland University of Technology, specialising in using remote sensing and drones to map and manage conservation areas.
