Phytochrome Activation of K<sup>+</sup> Channels and Chloroplast Rotation in <i>Mougeotia</i>

Lew, Roger R.; Krasnoshtein, Flora; Serlin, Bruce S.; Schauf, C. L.

doi:10.1104/pp.98.4.1511

Cited by 8 publications

(2 citation statements)

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“…In another experimental system, that is the alga Mougeotia, red light regulates the positioning of the single large chloroplasts present in these cells via a phytochrome-dependent pathway that most likely involves a modulation of [Ca 2 + ] cyt [129,130]. Although an activation of ion channels has been demonstrated to occur in response to red light irradiation [131,132], the precise relationship between perception of red light, channel activation and chloroplast movement has so far not been elaborated in great detail.…”

Section: Red Light-induced Membrane Depolarization Mediated By Phytocmentioning

confidence: 96%

Ion channels in plant signaling

Zimmermann

Ehrhardt

Plesch

et al. 1999

CMLS, Cell. Mol. Life Sci.

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Plant ion channel activities are rapidly modulated in response to several environmental and endogenous stimuli such as light, pathogen attack and phytohormones. Electrophysiological as well as pharmacological studies provide strong evidence that ion channels are essential for the induction of specific cellular responses, implicating their tight linkage to signal transduction cascades. Ion channels propagate signals by modulating the membrane potential or by directly affecting cellular ion composition. In addition, they may also be effectors at the end of signaling cascades, as examplified by ion channels which determine the solute content of stomatal guard cells. Plant channels are themselves subject to regulation by a variety of cellular factors, including calcium, pH and cyclic nucleotides. In addition, they appear to be regulated by (de)-phosphorylation events as well as by direct interactions with cytoskeletal and other cellular proteins. This review summarizes current knowledge on the role of ion channels in plant signaling.

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Section: Red Light-induced Membrane Depolarization Mediated By Phytocmentioning

confidence: 96%

Ion channels in plant signaling

Zimmermann

Ehrhardt

Plesch

et al. 1999

CMLS, Cell. Mol. Life Sci.

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“…The response is effected by the actin cytoskeleton at the site of illumination (Mineyuka et al, 1995). The overall mechanism of this response has been well characterized (Haupt, 1982;Lew et al, 1992). The morphology of the cell has been described in detail in a series of well-illustrated electron microscopy studies (Tretyn et al, 1992), but the techniques available did not allow for an examination of dynamic changes.…”

Section: Introductionmentioning

confidence: 98%

Morphology and dynamics of mitochondria inMougeotiasp.

Brickley

Weise²,

Hawes

et al. 2010

European Journal of Phycology

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Mougeotia sp. are widely distributed freshwater algae that have a characteristic chloroplast rotation response to incident light. The mechanics of the response have been elucidated, but no work regarding the bioenergetics of this process has been reported. The current study examined the morphology and movement dynamics of mitochondria in this alga. A novel method, utilizing DASPMI (dimethylaminostyrylmethylpyridiniumiodine) fluorescent dye, was developed to allow vital mitochondrial staining while avoiding sequestration of the dye by numerous cytoplasmic vesicles and then used to study mitochondrial dynamics. Mitochondria were elongated tubular structures that were significantly asymmetrically located in the perinuclear and chloroplast edge regions. The mitochondria displayed small amplitude undirected movements with occasional highvelocity bursts of directional movement which were of greater magnitude. These latter movements were inhibited by a 30-min incubation with latrunculin (50 mM), but were unaffected by incubation with colchicine (10 mM), indicating that the actin, but not the microtubule cytoskeleton, is involved. The method used and the findings reported will allow research to be undertaken on the contribution of the chondriome to the chloroplast rotation response and other aspects of the bioenergetics of this organism.

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