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Photosynthesis

About: Photosynthesis is a research topic. Over the lifetime, 19789 publications have been published within this topic receiving 895197 citations.


Papers
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Journal ArticleDOI
TL;DR: The purpose of this contribution is to assess the effects of N-limitation on algal photosynthesis and address the key physiological and biochemical interactions that occur between the assimilation of inorganic nitrogen and algal Photosynthesis and carbon metabolism.
Abstract: The purpose of this contribution is to assess the effects of N-limitation on algal photosynthesis and address the key physiological and biochemical interactions that occur between the assimilation of inorganic nitrogen and algal photosynthesis and carbon metabolism

438 citations

Book ChapterDOI
01 Jan 1996
TL;DR: In this article, the chloroplast CO2 concentration of a leaf submitted to mild desiccation decreases because of stomatal closure, which causes a decrease in photochemical yield of open PS II centers and an increase of thermal dissipation of the excitons trapped in PS II units.
Abstract: The photosynthetic apparatus is resistant to drought. Net CO2 uptake of a leaf submitted to a mild desiccation decreases because of stomatal closure. As aresult, CO2 concentration in the chloroplast decreases in plants exposed to water shortage. This drop in the chloroplast CO2 concentration causes: (i) a decrease in photochemical yield of open PS II centers and, consequently, an increase of thermal dissipation of the excitons trapped in PS II units; (ii) a decline in the activity of some enzymes, e.g. sucrose phosphate synthase and nitrate reductase; (iii) an increase in the activity ofribulose 1,5-bisphosphate oxygenase.

438 citations

Journal ArticleDOI
TL;DR: The ratio of photosynthesis to transpiration, an instantaneous measure of intrinsic water-use efficiency, was highest in the species commonly found in the direst habitats and lowest in thespecies most common in the wettes habitats.
Abstract: In five California evergreen trees and shrubs cooccurring in this study but most common in habitats of different moisture availability, leaf nitrogen was a major determinant of photosynthetic capacity. Within each species, stomatal conductance was highly correlated with photosynthetic capacity, resulting in little variation in the concentration of CO2 in the intercellular spaces. Among species, intercellular CO2 concentrations varied significantly. Under controlled conditions, the leaves that realized the highest photosynthesis per unit of leaf nitrogen tended to realize the lowest photosynthesis per unit of water transpired. The ratio of photosynthesis to transpiration, an instantaneous measure of intrinsic water-use efficiency, was highest in the species commonly found in the direst habitats and lowest in the species most common in the wettes habitats.

436 citations

Journal ArticleDOI
TL;DR: The experimental evidence related to the ability of glycine betaine to enhance and stabilize the oxygen-evolving activity of the Photosystem II protein complexes of higher plants and cyanobacteria is described.
Abstract: Natural osmoregulatory substances (osmolytes) allow a wide variety of organisms to adjust to environments with high salt and/or low water content. In addition to their role in osmoregulation, some osmolytes protect proteins from denaturation and deactivation by, for example, elevated temperature and chaotropic compounds. A ubiquitous protein-stabilizing osmolyte is glycine betaine (N-trimethyl glycine). Its presence has been reported in bacteria, in particular cyanobacteria, in animals and in plants from higher plants to algae. In the present review we describe the experimental evidence related to the ability of glycine betaine to enhance and stabilize the oxygen-evolving activity of the Photosystem II protein complexes of higher plants and cyanobacteria. The osmolyte protects the Photosystem II complex against dissociation of the regulatory extrinsic proteins (the 18 kD, 23 kD and 33 kD proteins of higher plants and the 9 kD protein of cyanobacteria) from the intrinsic components of the Photosystem II complex, and it also stabilizes the coordination of the Mn cluster to the protein cleft. By contrast, glycine betaine has no stabilizing effect on partial photosynthetic processes that do not involve the oxygen-evolving site of the Photosystem II complex. It is suggested that glycine betaine might act, in part, as a solute that is excluded from charged surface domains of proteins and also as a contact solute at hydrophobic surface domains.

436 citations

Journal ArticleDOI
TL;DR: Induction of high activity of the Mehler ascorbate peroxidase pathway may be associated with acclimation to environmental stress, and appears to play a critical photoprotective role, substituting for CO(2) in sustaining electron flow.

434 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20242
20232,453
20225,090
2021738
2020732
2019616