Abstract
ABSTRACT Ricinus communis plants were grown under normal (350 ppm) and elevated (700 ppm) CO 2 atmosphere and the growth and carbohydrate status of leaf 2 (first leaf above the pair of primary leaves) was studied. Elevated carbon dioxide stimulated the growth of leaves 1·7‐fold. The glucose and fructose concentrations exhibited the same diurnal rhythm under both growth conditions. The sucrose concentrations stayed relatively constant and at 700 ppm were one‐third higher than at 350 ppm. The starch content increased steadily during the day and disappeared overnight at 350 ppm CO 2 , but remained partially in plants at 700 ppm CO 2 . Consequently at 700 ppm CO 2 , the leaves accumulated starch continuously over their life time. The rate of starch synthesis was correlated to the activity of ADP‐glucose pyrophosphorylase, which was related to the sucrose concentration in the leaf. It is concluded that sucrose controls the expression of ADP‐glucose pyrophosphorylase, leading to a shift of carbohydrate partitioning into starch when more sucrose is produced than consumed or exported, a situation which is especially pertinent at elevated CO 2 . These results show that the previously experimentally observed transscriptional regulation of starch synthesis by sucrose occurs in vivo in the daily life of a leaf.
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Claims 8
Claim · model-written summary
Elevated carbon dioxide stimulated leaf growth 1·7-fold.
- Taxon
- Ricinus communis L.
Ricinus communist0 - Treatment
- Elevated carbon dioxidee0
- Outcome
- growth of leavese0
- Direction
- stimulatede0
- Value
- 1·7‐folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated carbon dioxide stimulated the growth of leaves 1·7‐fold”
t0“Ricinus communis L.”
Claim · model-written summary
Glucose and fructose concentrations had the same diurnal rhythm under both growth conditions.
- Taxon
- Ricinus communis L.Ricinus communist0
- Outcome
- glucose and fructose concentrationse0
- Direction
- samee0
- Comparator
- both growth conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The glucose and fructose concentrations exhibited the same diurnal rhythm under both growth conditions”
t0“Ricinus communis L.”
Claim · model-written summary
Sucrose concentrations were relatively constant and one-third higher at 700 ppm than 350 ppm.
- Taxon
- Ricinus communis L.Ricinus communist0
- Treatment
- 700 ppme0
- Outcome
- sucrose concentrationse0
- Direction
- highere0
- Value
- one‐thirde0
- Comparator
- 350 ppme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sucrose concentrations stayed relatively constant and at 700 ppm were one‐third higher than at 350 ppm”
t0“Ricinus communis L.”
Claim · model-written summary
At 350 ppm CO2 starch increased during the day and disappeared overnight.
- Taxon
- Ricinus communis L.Ricinus communist0
- Outcome
- starch contente0
- Direction
- increasede0
- Qualifier
- during the day and disappeared overnight at 350 ppm CO 2e0
Not reportedSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The starch content increased steadily during the day and disappeared overnight at 350 ppm CO 2”
t0“Ricinus communis L.”
Claim · model-written summary
At 700 ppm CO2 starch remained partially overnight and accumulated continuously over leaf lifetime.
- Taxon
- Ricinus communis L.Ricinus communist0
- Outcome
- starche0
- Direction
- accumulatede0
- Qualifier
- at 700 ppm CO 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but remained partially in plants at 700 ppm CO 2 . Consequently at 700 ppm CO 2 , the leaves accumulated starch continuously over their life time”
t0“Ricinus communis L.”
Claim · model-written summary
Starch synthesis rate correlated with ADP-glucose pyrophosphorylase activity.
- Taxon
- Ricinus communis L.Ricinus communist0
- Gene
- ADP‐glucose pyrophosphorylasee0
- Outcome
- rate of starch synthesise0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of starch synthesis was correlated to the activity of ADP‐glucose pyrophosphorylase”
t0“Ricinus communis L.”
Claim · model-written summary
ADP-glucose pyrophosphorylase activity was related to leaf sucrose concentration.
- Taxon
- Ricinus communis L.Ricinus communist0
- Compound
- sucrosee0
- Outcome
- activity of ADP‐glucose pyrophosphorylasee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the activity of ADP‐glucose pyrophosphorylase, which was related to the sucrose concentration in the leaf”
t0“Ricinus communis L.”
Claim · model-written summary
The authors conclude that sucrose controls ADP-glucose pyrophosphorylase expression and shifts carbohydrate partitioning into starch.
- Taxon
- Ricinus communis L.Ricinus communist0
- Gene
- ADP‐glucose pyrophosphorylasee0
- Compound
- sucrosee0
- Outcome
- shift of carbohydrate partitioning into starche0
- Direction
- shifte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sucrose controls the expression of ADP‐glucose pyrophosphorylase, leading to a shift of carbohydrate partitioning into starch”
t0“Ricinus communis L.”
The same questions in other papers
co2 · growth · Ricinus communis (castor bean)Results agree
1 paper in the same direction as this paper
- 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.