title: Variation in Rubisco content and activity under variable climatic factors.
abstract: The main objective of the present review is to provide a compilation of published data of the effects of several climatic conditions on Rubisco, particularly its activity, state of activation, and concentration, and its influence on leaf gas exchange and photosynthesis. The environmental conditions analyzed include drought, salinity, heavy metals, growth temperature, and elevated [O3], [CO2], and ultraviolet-B irradiance. The results show conclusive evidence for a major negative effect on activity of Rubisco with increasing intensity of a range of abiotic stress factors. This decrease in the activity of Rubisco is associated with down-regulation of the activation state of the enzyme (e.g., by de-carbamylation and/or binding of inhibitory sugar phosphates) in response to drought or high temperature. On the contrary, the negative effects of low temperature, heavy metal stress (cadmium), ozone, and UV-B stress on Rubisco activity are associated with changes in the concentration of Rubisco. Notably, in response to all environmental factors, the regulation of in vivo CO2 assimilation rate was related to Rubisco in vitro parameters, either concentration and/or carboxylation, depending on the particular stress. The importance of the loss of Rubisco activity and its repercussion on plant photosynthesis are discussed in the context of climate change. It is suggested that decreased Rubisco activity will be a major effect induced by climate change, which will need to be considered in any prediction model on plant productivity in the near future.
authors.affiliation: Research Group on Plant Biology Under Mediterranean Conditions, Universitat de les Illes Balears, Ctra. de Valldemossa Km. 7.5, 07122, Palma, Spain, jeroni.galmes@uib.cat.
authors.forename: Jeroni
authors.initials: J
authors.lastname: Galmés
authors.forename: Iker
authors.initials: I
authors.lastname: Aranjuelo
authors.forename: Hipólito
authors.initials: H
authors.lastname: Medrano
authors.forename: Jaume
authors.initials: J
authors.lastname: Flexas
mesh_terms: D002245:Carbon Dioxide / Q000494:pharmacology; D002980:Climate; D057231:Climate Change; D055864:Droughts; D019216:Metals, Heavy / Q000633:toxicity; D010126:Ozone / Q000494:pharmacology; D010944:Plants / Q000187:drug effects / Q000201:enzymology* / Q000528:radiation effects; D012273:Ribulose-Bisphosphate Carboxylase / Q000378:metabolism*; D012965:Sodium Chloride / Q000494:pharmacology; D013312:Stress, Physiological / Q000187:drug effects / Q000528:radiation effects; D013696:Temperature; D014466:Ultraviolet Rays
chemical_list: D019216:Metals, Heavy; D002245:Carbon Dioxide; D012965:Sodium Chloride; D010126:Ozone; D012273:Ribulose-Bisphosphate Carboxylase