Abstract
The effects of the apoplastic, i.e. external, concentration of sucrose (0–30 m M ) on O 2 evolution, O 2 consumption, starch, sucrose, glucose and fructose content, and uptake and efflux of sucrose in mesophyll protoplasts of Pisum sativum L. cv. Fenomen were studied. Neither photosynthesis, dark respiration, sucrose nor starch content change with increased apoplastic sucrose concentration. The contents of glucose and fructose in the protoplasts increase with increased apoplastic sucrose concentration. The sucrose efflux increases with increased external sucrose concentrations between 1 and 5 m M , but above this range the efflux decreases with increased external sucrose concentrations. These findings indicate that although external sucrose does not enter the protoplasts, there is a relationship between the external sucrose pool and the internal pools of sugars in the mesophyll protoplasts. The results suggest an active sucrose efflux from the protoplasts at physiological concentrations of apoplastic sucrose (max 5 m M ) and a simple diffusion mechanism at higher concentrations.
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Claims 7
Claim · model-written summary
Increasing apoplastic sucrose did not change photosynthesis, dark respiration, sucrose or starch content.
- Taxon
- Pisum sativum L.
Lathyrus oleraceuse1 - Material
- Fenomene1
- Organ / stage
- mesophyll protoplastse1
- Treatment
- increased apoplastic sucrose concentratione0
- Outcome
- photosynthesis, dark respiration, sucrose nor starch contente0
- Direction
- Neithere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither photosynthesis, dark respiration, sucrose nor starch content change with increased apoplastic sucrose concentration.”
e1“mesophyll protoplasts of Pisum sativum L. cv. Fenomen”
Claim · model-written summary
Glucose and fructose contents increased with external sucrose.
- Taxon
- Pisum sativum L.Lathyrus oleraceuse1
- Material
- Fenomene1
- Treatment
- increased apoplastic sucrose concentratione0
- Outcome
- contents of glucose and fructosee0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The contents of glucose and fructose in the protoplasts increase with increased apoplastic sucrose concentration.”
e1“mesophyll protoplasts of Pisum sativum L. cv. Fenomen”
Claim · model-written summary
Sucrose efflux increased as external sucrose rose between 1 and 5 m M.
- Taxon
- Pisum sativum L.Lathyrus oleraceuse1
- Treatment
- increased external sucrose concentrationse0
- Outcome
- sucrose effluxe0
- Direction
- increasese0
- Qualifier
- between 1 and 5 m Me0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sucrose efflux increases with increased external sucrose concentrations between 1 and 5 m M”
e1“mesophyll protoplasts of Pisum sativum L. cv. Fenomen”
Claim · model-written summary
Above 5 m M, sucrose efflux decreased as external sucrose rose.
- Taxon
- Pisum sativum L.Lathyrus oleraceuse1
- Treatment
- increased external sucrose concentrationse0
- Outcome
- effluxe0
- Direction
- decreasese0
- Qualifier
- above this rangee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but above this range the efflux decreases with increased external sucrose concentrations.”
e1“mesophyll protoplasts of Pisum sativum L. cv. Fenomen”
e2“between 1 and 5 m M”
Claim · model-written summary
External sucrose was inferred not to enter the protoplasts despite its relation to internal sugar pools.
- Taxon
- Pisum sativum L.Lathyrus oleraceuse1
- Outcome
- external sucrose does not enter the protoplastse0
- Qualifier
- relationship between the external sucrose pool and the internal pools of sugarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“although external sucrose does not enter the protoplasts, there is a relationship between the external sucrose pool and the internal pools of sugars in the mesophyll protoplasts.”
e1“Pisum sativum L. cv. Fenomen”
Claim · model-written summary
Authors suggest active efflux at physiological apoplastic sucrose concentrations.
- Taxon
- Pisum sativum L.Lathyrus oleraceuse1
- Outcome
- active sucrose effluxe0
- Qualifier
- physiological concentrations of apoplastic sucrose (max 5 m M )e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results suggest an active sucrose efflux from the protoplasts at physiological concentrations of apoplastic sucrose (max 5 m M )”
e1“Pisum sativum L. cv. Fenomen”
Claim · model-written summary
Authors suggest simple diffusion at higher external sucrose concentrations.
- Taxon
- Pisum sativum L.Lathyrus oleraceuse1
- Outcome
- simple diffusion mechanisme0
- Qualifier
- at higher concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a simple diffusion mechanism at higher concentrations.”
e1“Pisum sativum L. cv. Fenomen”
The same questions in other papers
sucrose · physiology: photosynthesis · Lathyrus oleraceus (pea)Positive and negative results
1 in the opposite direction
- positive
sucrose · molecular: metabolites · Lathyrus oleraceus (pea)Positive and negative results
4 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
3 papers more in this group
See all 7 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.