Photophosphorylation

Jagendorf, A. T.

doi:10.1007/978-3-642-66505-9_22

Cited by 12 publications

(7 citation statements)

References 123 publications

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“…affect the pH gradient built up during light induced electron transport by taking up the protons (see e.g. Good 1977, Jagendorf 1977. The fifth compound, Aliquat 336 cannot have this rpode of action as it is a quaternary arnine lacking the ability of being protonated.…”

Section: Discussionmentioning

confidence: 99%

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Effects of long‐chained aliphatic amines on photosynthetic reactions in isolated spinach chloroplasts

Blanck

Egnéus

1983

Physiologia Plantarum

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The effect of six long‐chained aliphatic amines on 14CO2‐reduction, electron transport and the 515 nm absorbance change and shrinkage in isolated intact and broken chloroplasts from spinach (Spinacia oleracea L. cv. Weibulls Medania) was investigated. Five of the six investigated amines affected photosynthesis in intact chloroplasts by inhibiting 14CO2‐reduction. In broken chloroplasts the same amines uncoupled electron transport. When added to intact chloroplasts the five amines induced a light‐dependent oxygen uptake leading to (he formation of hydrogen peroxide. The oxygen uptake was not due to the amines acting as Mehler reactants. The mode of action, different from that of simple aliphatic amines, was an effect on membrane integrity, first affecting the membrane potential. At higher amine concentrations a more general effect on the ion conditions in the thylakoids was evident.

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Section: Discussionmentioning

confidence: 99%

“…3, and Egneus and Blanck 1977). We therefore investigated whether the membrane potential, the other component of the proton-motive force (Jagendorf 1977), could be affected by the amines. The fast absorbanee change at 515 nm, and the concurrent scattering change in isolated chloroplasts were measured.…”

Section: Aminementioning

confidence: 99%

Effects of long‐chained aliphatic amines on photosynthetic reactions in isolated spinach chloroplasts

Blanck

Egnéus

1983

Physiologia Plantarum

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“…Modifications in photosynthetic energy coupling within the overall framework of the Z scheme, such as an increased intersystem H'*'/e" ratio and/or a <3H^/ATP synthesized stoichiometry, eould reduce the minimum photon requirement for growth. There is still some uncertainty regarding these two aspects of photosynthetic energy transformation (Jagendorf, 1977;Cox & Olsen, 1982;Hangarter & Good, 1982).…”

Section: »2 (14)mentioning

confidence: 99%

Photon requirement for growth of the diatom Phaeodactylum tricornutum Bohlin (Bacillariophyceae)

Geider

1987

Plant Cell & Environment

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Photon requiretnents for growth (0^ ^) of the diatom Phaeodaetylutn trieornutum were determined under nutrient-suffieient conditions at two photon flux densities cortesponding to light limited and tiear-saturating conditions for growth. The value of (j)~' based on assitnilated carbon was light-dependent and varied frotn 8.8 to 14.0 tnol photon tnolC"' with the tninitnum value at the lowest photon flux density. These results are lower than might be predicted for microalgal growth based on the Z scheme of photosynthesis. Conversion of these values for carbon ftxation to estimates based on oxygen evolution is problematical due to uncertainty over the appropriate assimilatory quotient (Q,, = mol O2 mol C"')-Minimum values based on oxygen evolution rates ranged from 6.2 to 7.6 mol photon mol O2 ' using a g,, of 1.41 tnol Oj mol C"' obtained by Myers (1980). These estitnates are similar to our previous measuretnents for photosynthesis and indicate a high efficiency for light energy transforming reactions during growth. The values of (j)^' obtained in this work itidieate a number of inadequacies in our understanding of the energetics of microalgal growth and are inconsistent with our present knowledge of photosynthetic energy couphng in plant cells.

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“…This evidence is of two kinds. The coupling factor performs a unidirectional catalysis by synthesizing ATP without promoting any ATP hydrolysis or ATP-Pj exchange (Jagendorf, 1977). This implies activation only under conditions in which the forward reaction is feasible.…”

Section: Are the Observed Decays Of Xe Functions Of Couplingmentioning

confidence: 99%

“…Light-dependent electron transport acidifies the inside of the lamellar vesicles while at the same time the vesicles acquire an ability to make ATP (XE)' in a subsequent dark period (Hind & Jagendorf, 1963;Jagendorf, 1977). Acidification of the vesicles by incubation in an acid medium also confers on them the ability to make ATP when the pH is raised (Jagendorf & Uribe, 1966).…”

mentioning

confidence: 99%

Energized state responsible for adenosine 5'-triphosphate synthesis in preilluminated chloroplast lamellae

Hangarter¹,

Good²

1984

Biochemistry

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Photophosphorylation

Cited by 12 publications

References 123 publications

Effects of long‐chained aliphatic amines on photosynthetic reactions in isolated spinach chloroplasts

Effects of long‐chained aliphatic amines on photosynthetic reactions in isolated spinach chloroplasts

Photon requirement for growth of the diatom Phaeodactylum tricornutum Bohlin (Bacillariophyceae)

Energized state responsible for adenosine 5'-triphosphate synthesis in preilluminated chloroplast lamellae

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