Abstract
In addition to an inhibitory effect on the photoreduction of NADP + by isolated spinach chloroplasts ( Spinacea oleracea L. cv. Melody Hybrid), sulfide initiated oxygen uptake by chloroplasts upon illumination, both in presence and absence of an electron acceptor. Sulfide‐induced oxygen uptake was sensitive to DCMU demonstrating the involvement of photosynthetic electron transport. Addition of superoxide dismutase to the chloroplast suspension prevented the sulfide‐induced oxygen uptake, which indicated that sulfide may be oxidized by the chloroplast, its oxidation being initiated by superoxide formed upon illumination (at the reducing side of PSI). Tris‐induced inhibition of NADP + photo‐reduction could not be abolished by sulfide, which indicated that sulfide could not act as an electron donor for PSI.
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Claims 6
Claim · model-written summary
Sulfide inhibits photoreduction of NADP+ by isolated spinach chloroplasts.
- Taxon
- spinach
Spinacia oleraceae1 - Treatment
- sulfidee2
- Outcome
- photoreduction of NADP +e1
- Direction
- inhibitorye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In addition to an inhibitory effect on the photoreduction of NADP + by isolated spinach chloroplasts”
e2“sulfide initiated oxygen uptake by chloroplasts upon illumination, both in presence and absence of an electron acceptor”
Claim · model-written summary
Sulfide initiates oxygen uptake by illuminated spinach chloroplasts, with or without an electron acceptor.
- Taxon
- spinachSpinacia oleraceae1
- Treatment
- sulfidee2
- Outcome
- oxygen uptake by chloroplastse2
- Direction
- initiatede2
- Qualifier
- in presence and absence of an electron acceptore2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In addition to an inhibitory effect on the photoreduction of NADP + by isolated spinach chloroplasts”
e2“sulfide initiated oxygen uptake by chloroplasts upon illumination, both in presence and absence of an electron acceptor”
Claim · model-written summary
Sulfide-induced oxygen uptake in spinach chloroplasts is sensitive to DCMU, which shows involvement of photosynthetic electron transport.
- Taxon
- spinachSpinacia oleraceae1
- Compound
- DCMUe3
- Outcome
- oxygen uptakee3
- Qualifier
- involvement of photosynthetic electron transporte3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In addition to an inhibitory effect on the photoreduction of NADP + by isolated spinach chloroplasts”
e3“Sulfide‐induced oxygen uptake was sensitive to DCMU demonstrating the involvement of photosynthetic electron transport”
Claim · model-written summary
Superoxide dismutase prevents sulfide-induced oxygen uptake by spinach chloroplasts.
- Taxon
- spinachSpinacia oleraceae1
- Treatment
- Addition of superoxide dismutasee4
- Gene
- superoxide dismutasee4
- Outcome
- oxygen uptakee4
- Direction
- preventede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In addition to an inhibitory effect on the photoreduction of NADP + by isolated spinach chloroplasts”
e4“Addition of superoxide dismutase to the chloroplast suspension prevented the sulfide‐induced oxygen uptake”
Claim · model-written summary
Sulfide may be oxidized by the spinach chloroplast, with oxidation initiated by superoxide formed upon illumination.
- Taxon
- spinachSpinacia oleraceae1
- Compound
- superoxidee5
- Outcome
- oxidizede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In addition to an inhibitory effect on the photoreduction of NADP + by isolated spinach chloroplasts”
e5“sulfide may be oxidized by the chloroplast, its oxidation being initiated by superoxide formed upon illumination (at the reducing side of PSI)”
Claim · model-written summary
Sulfide cannot act as an electron donor for photosystem I and does not abolish Tris-induced inhibition of NADP+ photoreduction.
- Taxon
- spinachSpinacia oleraceae1
- Compound
- sulfidee6
- Outcome
- act as an electron donor for PSIe6
- Qualifier
- could not be abolished by sulfidee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In addition to an inhibitory effect on the photoreduction of NADP + by isolated spinach chloroplasts”
e6“could not be abolished by sulfide, which indicated that sulfide could not act as an electron donor for PSI”
The same questions in other papers
sulfide · molecular: metabolites · Spinacia oleracea (spinach)Results agree
1 paper in the same direction as this paper
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.