Abstract
Effects of sulfur on photosynthesis in sugar beets (Beta vulgaris L. cv. F58-554H1) were studied by inducing sulfur deficiency and determining changes in the photosynthesis of whole attached leaves and of isolated chloroplasts. The rates of photosynthetic CO(2) uptake by intact leaves, photoreduction of ferricyanide, cyclic and noncyclic photophosphorylation of isolated chloroplasts, and the rate of CO(2) assimilation by ribulose diphosphate carboxylase, decreased with decrease in total leaf sulfur from 2500 to about 500 mug g(-1) dry weight. Sulfur deficiency reduced photosynthesis through an effect on chlorophyll content, which decreased linearly with leaf sulfur, and by decreasing the rate of photosynthesis per unit chlorophyll. There was only a small effect of sulfur deficiency on stomatal diffusion resistance to CO(2) until leaf sulfur decreased below 1000 mug g(-1) when stomatal resistance became a more significant proportion of the total diffusion resistance to CO(2). Light respiration rates were positively correlated with photosynthesis rates and dark respiration was unchanged as leaf sulfur concentrations declined.
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Claims 11
Claim · model-written summary
Photosynthetic CO2 uptake by intact leaves decreased as leaf sulfur fell.
- Taxon
- sugar beets
Beta vulgaris subsp. vulgarise0e1 - Compound
- sulfure0
- Outcome
- photosynthetic CO(2) uptake by intact leavese0
- Direction
- decreasede0
- Value
- 2500 to about 500 mug g(-1) dry weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rates of photosynthetic CO(2) uptake by intact leaves, photoreduction of ferricyanide, cyclic and noncyclic photophosphorylation of isolated chloroplasts, and the rate of CO(2) assimilation by ribulose diphosphate carboxylase, decreased with decrease in total leaf sulfur from 2500 to about 500 mug g(-1) dry weight”
e1“sugar beets”
Claim · model-written summary
Ferricyanide photoreduction decreased as leaf sulfur fell.
- Taxon
- sugar beetsBeta vulgaris subsp. vulgarise0e1
- Compound
- sulfure0
- Outcome
- photoreduction of ferricyanidee0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photoreduction of ferricyanide, cyclic and noncyclic photophosphorylation of isolated chloroplasts, and the rate of CO(2) assimilation by ribulose diphosphate carboxylase, decreased with decrease in total leaf sulfur from 2500 to about 500 mug g(-1) dry weight”
e1“sugar beets”
Claim · model-written summary
Cyclic photophosphorylation decreased as leaf sulfur fell.
- Taxon
- sugar beetsBeta vulgaris subsp. vulgarise0e1
- Compound
- sulfure0
- Outcome
- cyclic photophosphorylatione0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cyclic and noncyclic photophosphorylation of isolated chloroplasts, and the rate of CO(2) assimilation by ribulose diphosphate carboxylase, decreased with decrease in total leaf sulfur”
e1“sugar beets”
Claim · model-written summary
Noncyclic photophosphorylation decreased as leaf sulfur fell.
- Taxon
- sugar beetsBeta vulgaris subsp. vulgarise0e1
- Compound
- sulfure0
- Outcome
- noncyclic photophosphorylatione0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cyclic and noncyclic photophosphorylation of isolated chloroplasts, and the rate of CO(2) assimilation by ribulose diphosphate carboxylase, decreased with decrease in total leaf sulfur”
e1“sugar beets”
Claim · model-written summary
Ribulose diphosphate carboxylase CO2 assimilation decreased as leaf sulfur fell.
- Taxon
- sugar beetsBeta vulgaris subsp. vulgarise0e1
- Gene
- ribulose diphosphate carboxylasee0
- Compound
- sulfure0
- Outcome
- rate of CO(2) assimilatione0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rate of CO(2) assimilation by ribulose diphosphate carboxylase, decreased with decrease in total leaf sulfur”
e1“sugar beets”
Claim · model-written summary
Chlorophyll content fell linearly with leaf sulfur under deficiency.
- Taxon
- sugar beetsBeta vulgaris subsp. vulgarise0e1
- Compound
- sulfure0
- Outcome
- chlorophyll contente0
- Direction
- decreased linearlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chlorophyll content, which decreased linearly with leaf sulfur”
e1“sugar beets”
Claim · model-written summary
Sulfur deficiency decreased photosynthesis per unit chlorophyll.
- Taxon
- sugar beetsBeta vulgaris subsp. vulgarise0e1
- Treatment
- Sulfur deficiencye0
- Outcome
- rate of photosynthesis per unit chlorophylle0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sulfur deficiency reduced photosynthesis through an effect on chlorophyll content, which decreased linearly with leaf sulfur, and by decreasing the rate of photosynthesis per unit chlorophyll”
e1“sugar beets”
Claim · model-written summary
Sulfur deficiency had only a small effect on stomatal CO2 diffusion resistance until sulfur fell below 1000 mug g(-1).
- Taxon
- sugar beetsBeta vulgaris subsp. vulgarise0e1
- Treatment
- sulfur deficiencye0
- Outcome
- stomatal diffusion resistance to CO(2)e0
- Direction
- small effecte0
- Qualifier
- below 1000 mug g(-1)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was only a small effect of sulfur deficiency on stomatal diffusion resistance to CO(2) until leaf sulfur decreased below 1000 mug g(-1)”
e1“sugar beets”
Claim · model-written summary
Below 1000 mug g(-1) leaf sulfur, stomatal resistance became a more significant part of total CO2 diffusion resistance.
- Taxon
- sugar beetsBeta vulgaris subsp. vulgarise0e1
- Outcome
- stomatal resistancee0
- Direction
- more significant proportione0
- Comparator
- total diffusion resistance to CO(2)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when stomatal resistance became a more significant proportion of the total diffusion resistance to CO(2)”
e1“sugar beets”
Claim · model-written summary
Light respiration rates correlated positively with photosynthesis rates.
- Taxon
- sugar beetsBeta vulgaris subsp. vulgarise0e1
- Outcome
- Light respiration ratese0
- Direction
- positively correlatede0
- Comparator
- photosynthesis ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Light respiration rates were positively correlated with photosynthesis rates”
e1“sugar beets”
Claim · model-written summary
Dark respiration was unchanged as leaf sulfur declined.
- Taxon
- sugar beetsBeta vulgaris subsp. vulgarise0e1
- Compound
- sulfure0
- Outcome
- dark respiratione0
- Direction
- unchangede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dark respiration was unchanged as leaf sulfur concentrations declined”
e1“sugar beets”
The same questions in other papers
sulfur atom · physiology: photosynthesis · Beta vulgaris (beet)Results agree
1 paper in the same direction as this paper
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
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.