Abstract
Photosynthesis and leaf ascorbate were measured in potato (Solanum tuberosum L.) plants grown in low light and then transferred to high light. Total foliar ascorbate content in low light-grown plants was 4.72+/-0.42 micromol mg(-1)chl. Over 80% of the ascorbate pool was found in the reduced form irrespective of position on the stem. No statistically-significant light-dependent effects were observed. Leaf discs supplied with [14C]-ascorbate in the dark showed significant ascorbate uptake such that after a 16h incubation over half of the total ascorbate pool in the discs was labelled [14C]-ascorbate. No ascorbate efflux from the leaves occurred during the period of [14C]-ascorbate uptake. The total amount of ascorbate did not increase, however, implying modified ascorbate turnover. The turnover of the [14C]-ascorbate in the leaves occurred at similar rates in both light and darkness. Little degradation of labelled ascorbate was observed, suggesting that uptake of exogenous ascorbate leads to inhibition of de novo ascorbate biosynthesis in potato leaf discs.
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Claims 10
Claim · model-written summary
Low-light-grown potato foliage contained 4.72+/-0.42 micromol mg(-1)chl total ascorbate.
- Taxon
- potato
Solanum tuberosume1 - Outcome
- Total foliar ascorbate contente0
- Value
- 4.72+/-0.42 micromol mg(-1)chle0
- Qualifier
- low light-grown plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total foliar ascorbate content in low light-grown plants was 4.72+/-0.42 micromol mg(-1)chl.”
e1“Potato Leaves”
Claim · model-written summary
Over 80% of the potato ascorbate pool was reduced, regardless of stem position.
- Taxon
- potatoSolanum tuberosume1
- Outcome
- ascorbate pool was found in the reduced forme0
- Value
- Over 80%e0
- Qualifier
- irrespective of position on the steme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Over 80% of the ascorbate pool was found in the reduced form irrespective of position on the stem.”
e1“Potato Leaves”
Claim · model-written summary
Light-dependent effects on the measured photosynthesis and ascorbate variables were not statistically significant.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- lighte0
- Outcome
- light-dependent effectse0
- Direction
- No statistically-significante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No statistically-significant light-dependent effects were observed.”
e1“Potato Leaves”
Claim · model-written summary
Potato leaf discs took up supplied [14C]-ascorbate significantly in darkness, labeling over half the pool after 16 h.
- Taxon
- potatoSolanum tuberosume1
- Organ / stage
- Leaf discse0
- Treatment
- supplied with [14C]-ascorbatee0
- Outcome
- ascorbate uptakee0
- Value
- over halfe0
- Qualifier
- after a 16h incubatione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf discs supplied with [14C]-ascorbate in the dark showed significant ascorbate uptake such that after a 16h incubation over half of the total ascorbate pool in the discs was labelled [14C]-ascorbate.”
e1“Potato Leaves”
Claim · model-written summary
No ascorbate efflux occurred during labeled ascorbate uptake.
- Taxon
- potatoSolanum tuberosume1
- Organ / stage
- leavese0
- Outcome
- No ascorbate efflux from the leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No ascorbate efflux from the leaves occurred during the period of [14C]-ascorbate uptake.”
e1“Potato Leaves”
Claim · model-written summary
The total ascorbate amount did not increase after uptake of exogenous ascorbate.
- Taxon
- potatoSolanum tuberosume1
- Treatment
- ascorbatee0
- Outcome
- total amount of ascorbatee0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The total amount of ascorbate did not increase, however, implying modified ascorbate turnover.”
e1“Potato Leaves”
Claim · model-written summary
The authors infer that exogenous ascorbate modified ascorbate turnover.
- Taxon
- potatoSolanum tuberosume1
- Compound
- ascorbatee0
- Outcome
- modified ascorbate turnovere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The total amount of ascorbate did not increase, however, implying modified ascorbate turnover.”
e1“Potato Leaves”
Claim · model-written summary
Labeled ascorbate turned over at similar rates in light and darkness.
- Taxon
- potatoSolanum tuberosume1
- Organ / stage
- leavese0
- Outcome
- turnover of the [14C]-ascorbatee0
- Direction
- similar ratese0
- Comparator
- light and darknesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The turnover of the [14C]-ascorbate in the leaves occurred at similar rates in both light and darkness.”
e1“Potato Leaves”
Claim · model-written summary
Little labeled ascorbate degradation was observed in potato leaves.
- Taxon
- potatoSolanum tuberosume0
- Organ / stage
- leaf discse0
- Outcome
- Little degradation of labelled ascorbatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Little degradation of labelled ascorbate was observed, suggesting that uptake of exogenous ascorbate leads to inhibition of de novo ascorbate biosynthesis in potato leaf discs.”
Claim · model-written summary
The authors infer that uptake of exogenous ascorbate inhibits de novo ascorbate biosynthesis.
- Taxon
- potatoSolanum tuberosume0
- Organ / stage
- potato leaf discse0
- Compound
- exogenous ascorbatee0
- Outcome
- inhibition of de novo ascorbate biosynthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Little degradation of labelled ascorbate was observed, suggesting that uptake of exogenous ascorbate leads to inhibition of de novo ascorbate biosynthesis in potato leaf discs.”
The same questions in other papers
ascorbate · molecular: metabolites · Solanum tuberosum (potato)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.