Relationship between Photosynthesis and Plasmalemma Transport

Hansen, Ulf‐Peter; Kolbowski, Jörg; Dau, Holger

doi:10.1093/jxb/38.12.1965

Cited by 36 publications

(28 citation statements)

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“…They assumed that surface charges at the chloroplasts may influence membrane transport and did not consider the possibility that perfusion might leave the narrow space between chloroplast and plasmalemma undistorted. Support for the involvement in the rapid light effects of diffusible substances, namely H + ions and Ca 2+ ions, has come from our previous studies (Hansen, Kolbowski & Dau, 1987;Vanselow, Dau & Hansen, 1988;Vanselow, Kolbowski & Hansen, 1989b) and from the experiments reported here.…”

Section: Introductionsupporting

confidence: 73%

“…This occurrence of equal time constants in F and V was also found in other species, like spinach, Aegopodium and Cygocactus truncatus (Vanselow et al, 1988;). The coincidence of time constants is less good in the case of ~4, but this is of no concern in the present study as this coincidence has been tested in previous investigations (Kolbowski, Keunecke & Hansen, 1984;Hansen et al, 1987;Vanselow et al, 1988Vanselow et al, , 1989b. Scatter of this magnitude occurs if free fits (without constraints to use equal time constants in different curves) are applied as done in the case of the data in Fig.…”

Section: Noise As a Means Of Providing Linear Responsesmentioning

confidence: 60%

“…5, and Hansen et al, 1987;Vanselow et al, 1988Vanselow et al, , 1989a and are not discussed here. The new information is related to the 5a component.…”

Section: Discussionmentioning

confidence: 99%

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Rapid effect of light on the K+ channel in the plasmalemma ofNitella

Vanselow¹,

Hansen²

1989

J. Membrain Biol.

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Summary. Chlorophyll fluorescence, plasmalemma potential and resistance were measured simultaneously and subjected to a kinetic analysis. It was found that the light-induced changes of all three signals have two time constants in common. The faster one (r4 = ca. 20 sec) was assigned to the action of light-induced proton uptake across the thylakoid membrane on the plasmalemma H + pump. The slower one (rs~, = 40 sec) is related to the light action of an unknown photosynthetic process on the potassium channel. The action on the K + channel was revealed from the reversal potential of the related effect on membrane potential. The comparison of the data with findings of other authors led to the hypothesis that the unknown photosynthetic mechanism is the depletion of NADP +, which stimulates the uptake of Ca > from the cytosol, which is required for the NAD-kinase. The resulting change in cytosolic Ca 2+ modulates the number of open K + channels.

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Section: Introductionsupporting

confidence: 73%

Section: Noise As a Means Of Providing Linear Responsesmentioning

confidence: 60%

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Rapid effect of light on the K+ channel in the plasmalemma ofNitella

Vanselow¹,

Hansen²

1989

J. Membrain Biol.

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“…This time-constant corresponds to the timeconstant r, of previous investigations. There is considerable evidence that it originates from an increase in thylakoid pH-gradient (Hansen et al 1987, Dau and Hansen 1989, Vanselow et al 1988, Vanselow et al 1989). Thus, the increase in thylakoid pH-gradient with the time-constant ' T 4 leads to the formation of qE causing the decrease of F', F 0 and ~bp shown in Fig.…”

Section: Relationship Between the Photochemical Yield And Qementioning

confidence: 99%

A study on the energy-dependent quenching of chlorophyll fluorescence by means of photoacoustic measurements

Dau

Hansen

1990

Photosynth Res

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The mechanism of energy-dependent quenching (qE) of chlorophyll fluorescence was studied employing photoacoustic measurements of oxygen evolution and heat release. It is shown that concomitant to the formation of qE the yield of open reaction centers φp decreases indicating that qE quenching originates from a process being competitive to fluorescence as well as to photochemistry. The analysis of heat release (rate of thermal deactivation) shows: 1. The competitive process is not given by a still unknown energy storing process. 2. If the competitive process would be a futile cycle the life-times of the involved intermediates had to be faster than 50 μs.The results of the photoacoustic measurements are in line with the idea that qE quenching originates from an increased probability of thermal deactivation of excited chlorophylls.

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“…Using perfused Chara cells, Mimura and Tazawa (1986) suggested that ATP and other adeninenucleotide levels in the narrow space between chloroplasts and plasma membrane may change depending on the photosynthetic activity and affect the activity of the H +-pump in the plasma membrane. Hansen and coworkers (Hansen et al 1987;Vanselow et al 1989) also stress the importance of changes in H + or Ca 2+ levels in this narrow space. However, it is not easy to detect changes in the levels of these substances in a local cell region in situ.…”

Section: Introductionmentioning

confidence: 95%

Role of cytoplasmic inorganic phosphate in light-induced activation of H+-pumps in the plasma membrane and tonoplast of Chara corallina

Takeshige

Mitsumori

Tazawa

et al. 1992

Planta

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A unique variant strain of Chara corallina, which contains little inorganic phosphate in the vacuole ([Pi]v) was isolated. The level of cytoplasmic inorganic phosphate ([Pi]c) in these cells was the same as that in normal cells. Using these unique cells, we studied the change in [Pi]c and the effect of Pi on the activities of electrogenic H(+)-pumps associated with the plasma membrane and tonoplast. Upon illumination, the plasma membrane of C. corallina became hyperpolarized by 15 mV, the pH of the vacuolar sap decreased by 0.5 unit, and [Pi]c decreased by 30% with a similar time course. The activities of the electrogenic H (+)-pump in the plasma membrane and the ATP and PPi-dependent H(+)-transport in the tonoplast were noncompetitively inhibited by Pi with Ki values of, in the order given, 21.3 mM, 22.1 mM and 37.7 mM. From the kinetics study we calculated that the electrogenic H(+)-pump in the plasma membrane and the ATP and PPi-dependent H(+) transport in the tonoplast were activated by, again in this order, 13%, 13% and 9%, in accordance with the decrease in [Pi]c. We propose that the change in [Pi]c is one of the regulators of photosynthesis-mediated activation of the H(+)-pumps in the plasma membrane and the tonoplast in C. corallina upon illumination.

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Relationship between Photosynthesis and Plasmalemma Transport

Cited by 36 publications

References 0 publications

Rapid effect of light on the K+ channel in the plasmalemma ofNitella

Rapid effect of light on the K+ channel in the plasmalemma ofNitella

A study on the energy-dependent quenching of chlorophyll fluorescence by means of photoacoustic measurements

Role of cytoplasmic inorganic phosphate in light-induced activation of H+-pumps in the plasma membrane and tonoplast of Chara corallina

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