Salt tolerance at single cell level in giant-celled Characeae

Beilby, Mary J.

doi:10.3389/fpls.2015.00226

Cited by 24 publications

(20 citation statements)

References 114 publications

(183 reference statements)

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“…The algal members of the Streptophyta are the Charophyceae sensu lato (Del Cortona et al ., 2020). The most morphologically complex of the Charophyceae are the Charales with most of the thallus volume occupied by giant cells (Beilby, 2015; Nishiyama et al ., 2018). Most of the Charales are freshwater, although some species occur in brackish waters (e.g.…”

Section: Organisms With Chlorophyllsmentioning

confidence: 99%

Energizing the plasmalemma of marine photosynthetic organisms: the role of primary active transport

Raven

Beardall

2020

J. Mar. Biol. Ass.

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Generation of ion electrochemical potential differences by primary active transport can involve energy inputs from light, from exergonic redox reactions and from exergonic ATP hydrolysis. These electrochemical potential differences are important for homoeostasis, for signalling, and for energizing nutrient influx. The three main ions involved are H+, Na+ (efflux) and Cl− (influx). In prokaryotes, fluxes of all three of these ions are energized by ion-pumping rhodopsins, with one archaeal rhodopsin pumping H+into the cells; among eukaryotes there is also an H+ influx rhodopsin in Acetabularia and (probably) H+ efflux in diatoms. Bacteriochlorophyll-based photoreactions export H+ from the cytosol in some anoxygenic photosynthetic bacteria, but chlorophyll-based photoreactions in marine cyanobacteria do not lead to export of H+. Exergonic redox reactions export H+ and Na+ in photosynthetic bacteria, and possibly H+ in eukaryotic algae. P-type H+- and/or Na+-ATPases occur in almost all of the photosynthetic marine organisms examined. P-type H+-efflux ATPases occur in charophycean marine algae and flowering plants whereas P-type Na+-ATPases predominate in other marine green algae and non-green algae, possibly with H+-ATPases in some cases. An F-type Cl−-ATPase is known to occur in Acetabularia. Some assignments, on the basis of genomic evidence, of P-type ATPases to H+ or Na+ as the pumped ion are inconclusive.

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Section: Organisms With Chlorophyllsmentioning

confidence: 99%

Energizing the plasmalemma of marine photosynthetic organisms: the role of primary active transport

Raven

Beardall

2020

J. Mar. Biol. Ass.

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“…Robinson and Lamprothamnium sp. were shown to respond to salinity changes by increasing vacuolar concentrations of K + , Cl − and sometimes sucrose, but not Na + (Beilby ). In both taxa, membrane potential is maintained by an increased activity of proton pumps.…”

Section: Physiological and Genomic Adaptations To Seawater And Freshwmentioning

confidence: 99%

Transitions between marine and freshwater environments provide new clues about the origins of multicellular plants and algae

Dittami

Heesch

Olsen

et al. 2017

Journal of Phycology

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Marine-freshwater and freshwater-marine transitions have been key events in the evolution of life, and most major groups of organisms have independently undergone such events at least once in their history. Here, we first compile an inventory of bidirectional freshwater and marine transitions in multicellular photosynthetic eukaryotes. While green and red algae have mastered multiple transitions in both directions, brown algae have colonized freshwater on a maximum of six known occasions, and angiosperms have made the transition to marine environments only two or three times. Next, we review the early evolutionary events leading to the colonization of current habitats. It is commonly assumed that the conquest of land proceeded in a sequence from marine to freshwater habitats. However, recent evidence suggests that early photosynthetic eukaryotes may have arisen in subaerial or freshwater environments and only later colonized marine environments as hypersaline oceans were diluted to the contemporary level. Although this hypothesis remains speculative, it is important to keep these alternative scenarios in mind when interpreting the current habitat distribution of plants and algae. Finally, we discuss the roles of structural and functional adaptations of the cell wall, reactive oxygen species scavengers, osmoregulation, and reproduction. These are central for acclimatization to freshwater or to marine environments. We observe that successful transitions appear to have occurred more frequently in morphologically simple forms and conclude that, in addition to physiological studies of euryhaline species, comparative studies of closely related species fully adapted to one or the other environment are necessary to better understand the adaptive processes.

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“…How do these responses to saline stress reflect in characean electrophysiology? Thousands of current-voltage (I/V) profiles have been recorded from many characean species and over a huge diversity of conditions (for review see Beilby 2015). The results are consistent for saline stress.…”

mentioning

confidence: 85%

Chara braunii genome: a new resource for plant electrophysiology

Beilby

2019

Biophys Rev

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The large-celled green alga Chara provided early electrophysiological data, but this model organism lost popularity once the smaller cells of higher plants became accessible to electrophysiology and genetic manipulation. However, with the sequencing of the Chara braunii genome (Nishiyama et al. Cell 174: 448-464, 2018), the molecular identity of the underlaying ion transporters in Characeae can be found and placed in evolutionary context. As Characeae are close to ancestors of land plants, the wealth of electrophysiological data will provide insights into important aspects of plant physiology, such as salt tolerance and sensitivity, carbon concentrating mechanisms, pH banding and the action potential generation.

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Salt tolerance at single cell level in giant-celled Characeae

Cited by 24 publications

References 114 publications

Energizing the plasmalemma of marine photosynthetic organisms: the role of primary active transport

Energizing the plasmalemma of marine photosynthetic organisms: the role of primary active transport

Transitions between marine and freshwater environments provide new clues about the origins of multicellular plants and algae

Chara braunii genome: a new resource for plant electrophysiology

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