Light‐induced modification of plant plasma membrane ion transport

Abstract

Light is not only the driving force for electron and ion transport in the thylakoid membrane, but also regulates ion transport in various other membranes of plant cells. Light-dependent changes in ion transport at the plasma membrane and associated membrane potential changes have been studied intensively over the last century. These studies, with various species and cell types, revealed that apart from regulation by chloroplasts, plasma membrane transport can be controlled by phytochromes, phototropins or channel rhodopsins. In this review, we compare light-dependent plasma membrane responses of unicellular algae (Eremosphaera and Chlamydomonas), with those of a multicellular alga (Chara), liverworts (Conocephalum), mosses (Physcomitrella) and several angiosperm cell types. Light-dependent plasma membrane responses of Eremosphaera and Chara are characterised by the dominant role of K(+) channels during membrane potential changes. In most other species, the Ca(2+)-dependent activation of plasma membrane anion channels represents a general light-triggered event. Cell type-specific responses are likely to have evolved by modification of this general response or through the development of additional light-dependent signalling pathways. Future research to elucidate these light-activated signalling chains is likely to benefit from the recent identification of S-type anion channel genes and proteins capable of regulating these channels.

Development of real-time radioisotope imaging systems for plant nutrient uptake studies

“…Similar observations have been made with other plants, such as Lotus japonicas (data not shown). Indeed, light [14] or circadian rhythms [15] have been found to directly or indirectly affect ion uptake, and such phenomena could have multiple and complex origins. Cd standard solution supplied to an inkjet printer to draw a grid [16].…”

Photosynthesis Activates Plasma Membrane H+-ATPase via Sugar Accumulation

“…Photosynthesis regulates diverse ion transports across the plasma membrane in many plant species (Marten et al, 2010). Plasma membrane H + -ATPase is responsible for photosynthesis-dependent H + transport, which causes membrane hyperpolarization.…”

“…This process is probably the primary mechanism by which H + -ATPase is activated. Photosynthesis regulates ion transport across the plasma membrane (Spanswick, 1981;Marten et al, 2010). Light-induced hyperpolarization of the plasma membrane has been particularly well studied in a diversity of plants, including Chara corallina and Vallisneria spiralis (Prins et al, 1980;Mimura and Tazawa, 1986).…”

ROS, Calcium, and Electric Signals: Key Mediators of Rapid Systemic Signaling in Plants

“…Although changes in light intensity or switching from light to dark conditions was recently found to induce systemic electrical signals that were influenced by cytosolic Ca 2+ and were light wavelength-specific (Szechy nskaHebda et al, 2010; for review, see Marten et al, 2010), questions about the molecular components involved in mediating and regulating these electrical waves during SAA remain at present unresolved (Fig. 1).…”