Abstract
An antiserum to synthetic Zeaxanthin inhibits photosynthetic electron transport on the oxygen-evolving side of photosystem II in tobacco chloroplasts and thylakoids of the filamentous blue-green alga Oscillatoria chalybea. The inhibition site lies for both species between the site of electron donation of water or tetramethyl benzidine and that of diphenyl carbazide or manganese II ions. Typical photosystem I reactions are not impaired by the antiserum. The effect of the antiserum concerning the inhibition site is practically identical to that of the earlier described antiserum to violaxanthin. However, the degree of inhibition seems to be generally somewhat lower with the antiserum to Zeaxanthin, than with that to violaxanthin which hints at a lesser accessibility of zeaxanthin, in the tylakoid membrane in comparison to violaxanthin. In the course of these investigations new evidence was obtained that the oxygen-evolving side of the electron transport scheme is differently organized in Oscillatoria chalybea when compared to tobacco chloroplasts. Thus, the silicomolybdate reduction with water as the electron donor is sensitive to DCMU in these algae.
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Claims 6
Claim · model-written summary
Zeaxanthin antiserum inhibited oxygen-evolving photosystem II electron transport in tobacco chloroplasts.
- Taxon
- tobacco
Nicotiana tabacume0 - Treatment
- antiserum to synthetic Zeaxanthine0
- Outcome
- photosynthetic electron transport on the oxygen-evolving side of photosystem IIe0
- Direction
- inhibitse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An antiserum to synthetic Zeaxanthin inhibits photosynthetic electron transport on the oxygen-evolving side of photosystem II in tobacco chloroplasts”
Claim · model-written summary
The inhibition site lay between donor and acceptor sites specified in the abstract.
- Taxon
- TobaccoNicotiana tabacumt0
- Outcome
- inhibition sitee0
- Qualifier
- between the site of electron donation of water or tetramethyl benzidine and that of diphenyl carbazide or manganese II ionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inhibition site lies for both species between the site of electron donation of water or tetramethyl benzidine and that of diphenyl carbazide or manganese II ions.”
t0“Tobacco Chloroplasts”
Claim · model-written summary
Typical photosystem I reactions were unimpaired by the antiserum.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- antiserume0
- Outcome
- Typical photosystem I reactionse0
- Direction
- not impairede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Typical photosystem I reactions are not impaired by the antiserum.”
t0“Tobacco Chloroplasts”
Claim · model-written summary
The zeaxanthin antiserum had a nearly identical inhibition site to violaxanthin antiserum.
- Taxon
- TobaccoNicotiana tabacumt0
- Outcome
- inhibition sitee0
- Comparator
- antiserum to violaxanthine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of the antiserum concerning the inhibition site is practically identical to that of the earlier described antiserum to violaxanthin.”
t0“Tobacco Chloroplasts”
Claim · model-written summary
Zeaxanthin antiserum generally inhibited less than violaxanthin antiserum.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- antiserum to Zeaxanthine0
- Outcome
- degree of inhibitione0
- Direction
- lowere0
- Comparator
- violaxanthine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the degree of inhibition seems to be generally somewhat lower with the antiserum to Zeaxanthin, than with that to violaxanthin”
t0“Tobacco Chloroplasts”
Claim · model-written summary
Silicomolybdate reduction with water as donor was DCMU-sensitive in Oscillatoria.
- Taxon
- Oscillatoria chalybea
Phormidium chalybeumt0 - Outcome
- silicomolybdate reduction with water as the electron donor is sensitive to DCMUe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the silicomolybdate reduction with water as the electron donor is sensitive to DCMU in these algae.”
t0“Blue Green Alga Oscillatoria chalybea”