Chloroplast Photorelocation Movement

Wada, Masamitsu

doi:10.1007/4-431-27092-2_22

Cited by 4 publications

(3 citation statements)

References 24 publications

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“…Also noteworthy is that the signals for accumulation and avoidance responses appear to differ from each other, based on the initial rate of avoidance and accumulation movements differing ( L. trisulca ; Malec ), and on distinct behavior of chloroplasts when movements are induced by a light pulse from a bright microbeam ( A. capillus‐veneris ; Wada ). The signal for the accumulation response appears to persist, whereas that for the avoidance response seems to diminish soon after switching off the light (Wada ). Interestingly, in A. capillus‐veneris protonemal cells that were grown under continuous red light, the speed of signal transfer for the accumulation response depends on cell polarity.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, photoreceptors and motility mechanisms have been identified and characterized (Wada 2005;Suetsugu and Wada 2007;Banaś et al 2012;Kong and Wada 2014). In the seed plant, A. thaliana, light triggering the avoidance response is absorbed by a blue light receptor, phototropin 2 (phot2) (Jarillo et al 2001;Kagawa et al 2001) that is localized on the chloroplasts (Kong et al 2013b).…”

Section: Introductionmentioning

confidence: 99%

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Clues to the signals for chloroplast photo‐relocation from the lifetimes of accumulation and avoidance responses

Higa

Wada

2015

JIPB

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Chloroplast photo-relocation movement is crucial for plant survival; however, the mechanism of this phenomenon is still poorly understood. Especially, the signal that goes from photoreceptor to chloroplast is unknown, although the photoreceptors (phototropin 1 and 2) have been identified and an actin structure (chloroplast actin filaments) has been characterized that is specific for chloroplast movement. Here, in gametophytes of the fern Adiantum capillus-veneris, gametophores of the moss Physcomiterella patens, and leaves of the seed plant Arabidopsis thaliana, we sought to characterize the signaling system by measuring the lifetime of the induced response. Chloroplast movements were induced by microbeam irradiation with high-intensity blue light and recorded. The lifetime of the avoidance state was measured as a lag time between switching off the beam and the loss of avoidance behavior, and that of the accumulation state was measured as the duration of accumulation behavior following the extinction of the beam. The lifetime for the avoidance response state is approximately 3-4 min and that for the accumulation response is 19-28 min. These data suggest that the two responses are based on distinct signals.Keywords: Blue light; chloroplast movement; fern gametophyte; intracellular signaling; phototropin Citation: Higa T and Wada M (2015) Clues to the signals for chloroplast photo-relocation from the lifetimes of accumulation and avoidance responses.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Clues to the signals for chloroplast photo‐relocation from the lifetimes of accumulation and avoidance responses

Higa

Wada

2015

JIPB

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“…45 Isn't it the photoreceptors that perceive the sunlight? [46][47][48] Isn't there a link between the locally available plants and the opportunity to treat diseases? 49,50 Isn't there a link between diet, nutrition, behavior and health?…”

Section: Is Oxygen An Endocrine Signal or Not?mentioning

confidence: 99%

Arguments for gasocrine signaling

Anbalagan

2023

Preprint

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In cellular signaling, a cell can send specific signals to another cell with a clear intention. The sent signals are sensed by the receiving cell, triggering a cellular response. If these sender and receiver cells are in direct physical proximity, the signaling is labeled as paracrine. If these cells are far and the signal is transported, the signaling is labeled as endocrine. In this manuscript, as others have argued in the past, I also argue that gasotransmitters must not be excluded as endocrine signaling molecules. I argue that, like LEGO bricks that can be built, dismantled, and rebuilt into anything of the builder's imagination, gasotransmitters are also LEGO bricks of endocrine signaling. I argue that we must bend the rules of definitions in endocrine signaling to incorporate gasotransmitter-based endocrine signaling, which I call gasocrine signaling. If the reason that oxygen is not considered an endocrine molecule is based on the fact that it does not satisfy the definition of signal – ‘signal is something that passes from a sender to a receiver that carries a ‘specific’ message’, then I argue that the ‘message’ is simply ‘live’ or ‘die’, depending on whether the organism is aerobe or anaerobe, respectively. I argue that HIFα is the receptor for oxygen. Gasocrine signaling, I propose, is our Earth’s equivalent of Na’vi’s connection with the ecosystem of Pandora in the movie Avatar.

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Impact of two different types of heat stress on chloroplast movement and fluorescence signal of tobacco leaves

et al. 2010

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Although the chloroplast movement can be strongly affected by ambient temperature, the information about chloroplast movement especially related to high temperatures is scarce. For detailed investigation of the effects of heat stress (HS) on tobacco leaves (Nicotiana tabacum L. cv. Samsun), we used two different HS treatments in dark with wide range of elevated temperatures (25-45 degrees C). The leaf segments were either linearly heated in water bath at heating rate of 2 degrees C min(-1) from room temperature up to maximal temperature (T (m)) and then linearly cooled down to 25 degrees C or incubated for 5 min in water bath at the same T (m) followed by 5 min incubation at 25 degrees C (T-jump). The changes in light-induced chloroplast movement caused by the HS pretreatment were detected after the particular heating regime at 25 degrees C using a method of time-dependent collimated transmittance (CT) and compared with the chlorophyll O-J-I-P fluorescence rise (FLR) measurements. The inhibition of chloroplast movement started at about 40 degrees C while the fluorescence parameters responded generally at higher T (m). This difference in sensitivity of CT and FLR was higher for the T-jump than for the linear HS indicating importance of applied heating regime. A possible influence of chloroplast movement on the FLR measurement and a physiological role of the HS-impaired chloroplast movement are discussed.

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Chloroplast Photorelocation Movement

Cited by 4 publications

References 24 publications

Clues to the signals for chloroplast photo‐relocation from the lifetimes of accumulation and avoidance responses

Clues to the signals for chloroplast photo‐relocation from the lifetimes of accumulation and avoidance responses

Arguments for gasocrine signaling

Impact of two different types of heat stress on chloroplast movement and fluorescence signal of tobacco leaves

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