Abstract
Abstract In mesophyll chloroplasts from maize, photosystem (PS) II activities (2,6 dichlorophenol indophenol photoreduction and the variable fluorescence yield of chlorophyll (Chl) a) are inhibited strongly by 0.5 mM cadmium, supplied as Cd(NO3)2. However, diphenylcarbazide restores these activities suggesting that cadmium inhibits PSII activity at the oxygen evolving site between water and Y (the first secondary electron donor of PSII). PSI activity (light induced P700 oxidation) is insensitive' to cadmium. Furthermore, absorption and fluorescence studies showed that cadmium causes a 20% to 30% decrease in the total chlorophylls, 15% to 25% decrease in the ratio of Ch1 a/Chl b and a 20% to 25% decrease in the ratio of the short to the long wavelength forms of Chl a.
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Claims 7
Claim · model-written summary
Cadmium strongly inhibited maize chloroplast PSII activities.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In mesophyll chloroplasts from maize, photosystem (PS) II activities (2,6 dichlorophenol indophenol photoreduction and the variable fluorescence yield of chlorophyll (Chl) a) are inhibited strongly by 0.5 mM cadmium, supplied as Cd(NO3)2”
Claim · model-written summary
Diphenylcarbazide restored the inhibited PSII activities.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“diphenylcarbazide restores these activities suggesting that cadmium inhibits PSII activity at the oxygen evolving site between water and Y”
e1“In mesophyll chloroplasts from maize, photosystem (PS) II activities”
Claim · model-written summary
The authors inferred that cadmium inhibits PSII at the oxygen evolving site between water and Y.
- Treatment
- cadmiume0
- Outcome
- PSII activitye0
- Direction
- inhibitse0
- Qualifier
- at the oxygen evolving site between water and Ye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cadmium inhibits PSII activity at the oxygen evolving site between water and Y”
e1“chloroplasts from maize”
Claim · model-written summary
Maize chloroplast PSI activity was insensitive to cadmium.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PSI activity (light induced P700 oxidation) is insensitive' to cadmium”
e1“chloroplasts from maize”
Claim · model-written summary
Cadmium decreased total chlorophylls by 20% to 30%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cadmium causes a 20% to 30% decrease in the total chlorophylls”
e1“chloroplasts from maize”
Claim · model-written summary
Cadmium decreased the Ch1 a/Chl b ratio by 15% to 25%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“15% to 25% decrease in the ratio of Ch1 a/Chl b”
e1“cadmium causes a 20% to 30% decrease”
e2“chloroplasts from maize”
Claim · model-written summary
Cadmium decreased the ratio of short to long wavelength Chl a forms by 20% to 25%.
- Treatment
- cadmiume1
- Outcome
- ratio of the short to the long wavelength forms of Chl ae0
- Direction
- decreasee0
- Value
- 20% to 25%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“20% to 25% decrease in the ratio of the short to the long wavelength forms of Chl a”
e1“cadmium causes a 20% to 30% decrease”
e2“chloroplasts from maize”
The same questions in other papers
cadmium atom · molecular: metabolites · Zea mays (maize)Results differ
35 papers in the same direction as this paper · 12 in the opposite direction
- negative
- positive
- positive
44 papers more in this group
See all 48 papers →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.