Effects of pH on reactions on the donor side of Photosystem II

Bowes, Jane M.; Crofts, Antony R.; Itoh, Shigeru

doi:10.1016/0005-2728(79)90015-x

Cited by 36 publications

(12 citation statements)

References 21 publications

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“…Cyclic electron flow is known to enhance the intensity of the ms-DLE (Wraight and Crofts 1971;Evans and Crofts 1973;Bowes et al 1979). Therefore, changes in ms-DLE are thought to be indicative of the photophosphorylation-related transmembrane proton force (Wraight and Crofts 1971;Xu and Shen 1983).…”

Section: Discussionmentioning

confidence: 99%

“…The slow phase follows within a few seconds, and is marked by a change in the signal as it reaches and maintains a steady state. Crofts and colleagues (Wraight and Crofts 1971;Evans and Crofts 1973;Bowes et al 1979) have shown that the fast phase of ms-DLE is associated with a rapid establishment of the thylakoid membrane potential, while the slow phase of ms-DLE was stimulated mainly by a proton gradient across the thylakoid membrane.…”

Section: Introductionmentioning

confidence: 99%

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Different Pathways are Involved in the Enhancement of Photosynthetic Rate by Sodium Bisulfite and Benzyladenine, a Case Study with Strawberry (Fragaria×Ananassa Duch) Plants

et al. 2006

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In order to understand the pathway involved in the chemical enhancement of photosynthetic rate, sodium bisulfite (NaHSO 3 ) and benzyladenine (BA), a growth regulator, were applied to strawberry plants. The influence of these compounds on gas exchange and millisecond delayed light emission (ms-DLE) was investigated using 2-month-old plants. Results showed the net photosynthetic rate (A) in leaves was promoted by both NaHSO 3 and BA. Stomatal conductance (g) and transpiration rate (E) were significantly increased only by BA, while intercellular CO 2 concentration (C i ) was significantly decreased by NaHSO 3 . The enhancement of A by NaHSO 3 and BA was only a short-term effect, lasting approximately 5 days for NaHSO 3 and 30 h for BA. Plants treated with NaHSO 3 , BA or NaH-SO 3 + BA, showed no significant fluctuations in carboxylation efficiency (CE), photorespiration (R P ) or dark respiration (R D ). These results suggest that the influences of NaHSO 3 and BA on gas exchange particularly A, could be via different mechanisms: the enhancement of A by the application of low concentrations of NaHSO 3 appears to be associated with increased cyclic electron flow, while BA enhancement of A is at least partially due to increased g and/or E.Abbreviations: A -net photosynthetic rate; BA -benzyladenine; CE -carboxylation efficiency; C iintercellular CO 2 concentration; E -transpiration rate; g -stomatal conductance; P R -photo-respiratory rate; R D -rate of dark respiration; NaHSO 3 -sodium bisulfite; ms-DLE -millisecond delayed light emission

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Different Pathways are Involved in the Enhancement of Photosynthetic Rate by Sodium Bisulfite and Benzyladenine, a Case Study with Strawberry (Fragaria×Ananassa Duch) Plants

et al. 2006

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“…It has been previously reported that the intensity of fast and slow phases of ms-DLE closely correlates with ΔE and ΔpH levels, respectively [14][15][16]. To confirm the relationship between ΔpH and the slow phase of ms-DLE, an uncoupler, nigericin (Nig), which decreases ΔpH by stimulating exchanges of H + and K + between the two sides of the thylakoid, was used.…”

Section: The Slow Phase Of Ms-dle Reflects In Vivo δPhmentioning

confidence: 99%

“…Millisecond-delayed light emission (ms-DLE) originates from the reverse reaction of the photoact in PSII, and is composed of one fast (within 0.1 s of the onset of measuring flashes) and one slow phase [12,13]. Crofts and his colleagues concluded that the intensities of the fast and slow phases of ms-DLE are stimulated by the membrane potential (ΔE) and the ΔpH, respectively [14][15][16]. Further characteristics and properties of ms-DLE were studied and confirmed in subsequent research [17][18][19][20][21].…”

mentioning

confidence: 99%

Changes in the transthylakoid proton gradient are caused by the movement of phycobilisomes in the cyanobacterium Synechocystis sp. strain PCC 6803

Feng

et al. 2011

Chin. Sci. Bull.

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Phycobilisomes (PBSs) are the main accessory light-harvesting complexes in cyanobacteria and their movement between photosystems (PSs) affects cyclic and respiratory electron transport. However, it remains unclear whether the movement of PBSs between PSs also affects the transthylakoid proton gradient (ΔpH). We investigated the effect of PBS movement on ΔpH levels in a unicellular cyanobacterium Synechocystis sp. strain PCC 6803, using glycinebetaine to immobilize and couple PBSs to photosystem II (PSII) or photosystem I (PSI) by applying under far-red or green light, respectively. The immobilization of PBSs at PSII inhibited decreases in ΔpH, as reflected by the slow phase of millisecond-delayed light emission (ms-DLE) that occurs during the movement of PBSs from PSII to PSI. By contrast, the immobilization of PBSs at PSI inhibited the increase in ΔpH that occurs when PBSs move from PSI to PSII. Comparison of the changes in ΔpH and electron transport caused by the movement of PBSs between PSs indicated that the changes in ΔpH were most likely caused by respiratory electron transport. This will further improve our understanding of the physiological role of PBS movement in cyanobacteria. A balanced distribution of the excitation energy absorbed by light-harvesting complexes to the complexes of photosystems I and II (PSI and II) is considered to be one of the most important factors for ensuring optimal photosynthetic efficiency [1][2][3]. In response to fluctuating light conditions, the photosynthetic machinery regulates the distribution of excitation energy between the 2 photosystems (PSs) [4]. This dynamic and rapid process of achieving energy balance is called "state transition" [5,6]. Because phycobilisome (PBS) movement is a prerequisite for cyanobacterial state transitions [7,8], "mobile PBSs" are believed to play a key role in allowing state transitions in cyanobacteria. A recent study indicated that the movement of PBSs between PSII and PSI affects both cyclic and respiratory electron transport [9]. However, it remains unclear whether the movement of *Corresponding author (email: wma@shnu.edu.cn) PBSs between PSs also affects transthylakoid proton gradient (ΔpH) levels in cyanobacterial cells. The aim of this study was to investigate the effect of PBS movement between the 2 PSs on ΔpH levels in cyanobacteria. It is difficult to probe ΔpH levels in vivo as the system relaxes rapidly [10,11]. Millisecond-delayed light emission (ms-DLE) originates from the reverse reaction of the photoact in PSII, and is composed of one fast (within 0.1 s of the onset of measuring flashes) and one slow phase [12,13]. Crofts and his colleagues concluded that the intensities of the fast and slow phases of ms-DLE are stimulated by the membrane potential (ΔE) and the ΔpH, respectively [14][15][16]. Further characteristics and properties of ms-DLE were studied and confirmed in subsequent research [17][18][19][20][21]. It was found that ΔpH levels can be probed in vivo by measuring the slow phase of ms-DLE.

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“…Changes in microsecond fluorescence yields were measured as described previously (Bowes et al, 1979) using a home-built rapid fluorescence photometer. Fluorescence emission was elicited by a weak probe of blue light from a xenon flash lamp (2.5 ps duration at half-maximal intensity), screened by a Corning 4-96 filter.…”

Section: Flash-lnduced Fluorescence Measurementsmentioning

confidence: 99%

Effects of the Alkaloid Gramine on the Light-Harvesting, Energy Transfer, and Growth of Anabaena sp. (PCC 7119)

Foguel

Chaloub

1993

Plant Physiol.

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Long-term and short-term effects of gramine on cells of Anabaena sp. were studied. Culture death was observed after an initial growth in the presence of 0.5 mM gramine, and lower concentrations decreased both the specific growth rate and the growth yield. Cultures showed a reduction in the chlorophyll content as well as an increase in the level of accessory pigments, which were proportional to the alkaloid concentration. When cultures were excited with green light in the presence of 3-(3,4-dichlorophenyI)-l,ldimethylurea, the fluorescence spectra of the cells showed a shoulder at 685 nm related to the photosystem II (PSII) antennae emission. lhis band was reduced when gramine was present during the growth, suggesting that gramine suppresses the energy transfer between the phycobilisomes and PSII. At lethal concentrations for cellular growth, gramine suppressed immediately the photosynthetic oxygen production as well as the electron transport from H 2 0 to p-benzoquinone. l h e influence of gramine on the PSll photochemical reactions was investigated by flash-induced fluorescence measurements, and the results suggest that the alkaloid could act as an electron donor to the PSll reaction center.

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Effects of pH on reactions on the donor side of Photosystem II

Cited by 36 publications

References 21 publications

Different Pathways are Involved in the Enhancement of Photosynthetic Rate by Sodium Bisulfite and Benzyladenine, a Case Study with Strawberry (Fragaria×Ananassa Duch) Plants

Different Pathways are Involved in the Enhancement of Photosynthetic Rate by Sodium Bisulfite and Benzyladenine, a Case Study with Strawberry (Fragaria×Ananassa Duch) Plants

Changes in the transthylakoid proton gradient are caused by the movement of phycobilisomes in the cyanobacterium Synechocystis sp. strain PCC 6803

Effects of the Alkaloid Gramine on the Light-Harvesting, Energy Transfer, and Growth of Anabaena sp. (PCC 7119)

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