Abstract
Young, visually symptomless leaves from potato (Solanum tuberosum) plants infected with Verticillium dahliae exhibited reduced carbon assimilation rate, stomatal conductance, and intercellular CO(2), but no increase in dark respiration, no change in the relationship between carbon assimilation rate versus intercellular CO(2), and no change in light use efficiency when intercellular CO(2) was held constant. Therefore, the initial decrease in photosynthesis caused by V. dahliae was caused by stomatal closure. Errors in the intercellular CO(2) calculation caused by uneven distribution of carbon assimilation rate across the leaf were tested by (14)CO(2) autoradiography. Patchiness was found at a low frequency. Low stomatal conductance was correlated with low leaf water potentials. Infection did not affect leaf osmotic potentials.
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Claims 8
Claim · model-written summary
Infected symptomless potato leaves had reduced carbon assimilation, stomatal conductance and intercellular CO(2).
- Taxon
- potato
Solanum tuberosume0 - Treatment
- infected with Verticillium dahliaee0
- Interactor
- Verticillium dahliae
Verticillium dahliaee0pathogen - Outcome
- carbon assimilation rate, stomatal conductance, and intercellular CO(2)e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Young, visually symptomless leaves from potato (Solanum tuberosum) plants infected with Verticillium dahliae exhibited reduced carbon assimilation rate, stomatal conductance, and intercellular CO(2)”
Claim · model-written summary
Infection did not increase dark respiration.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Verticillium dahliaet0
- Interactor
- Verticillium dahliaeVerticillium dahliaet0pathogene0
- Outcome
- dark respiratione0
- Direction
- no increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but no increase in dark respiration”
t0“Mechanism of Photosynthesis Decrease by Verticillium dahliae in Potato”
Claim · model-written summary
Infection did not change the assimilation versus intercellular CO(2) relation.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Verticillium dahliaet0
- Interactor
- Verticillium dahliaeVerticillium dahliaet0pathogene0
- Outcome
- relationship between carbon assimilation rate versus intercellular CO(2)e0
- Direction
- no changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no change in the relationship between carbon assimilation rate versus intercellular CO(2)”
t0“Mechanism of Photosynthesis Decrease by Verticillium dahliae in Potato”
Claim · model-written summary
Infection did not change light use efficiency at constant intercellular CO(2).
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Verticillium dahliaet0
- Interactor
- Verticillium dahliaeVerticillium dahliaet0pathogene0
- Outcome
- light use efficiencye0
- Direction
- no changee0
- Qualifier
- when intercellular CO(2) was held constante0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no change in light use efficiency when intercellular CO(2) was held constant”
t0“Mechanism of Photosynthesis Decrease by Verticillium dahliae in Potato”
Claim · model-written summary
The authors attribute the initial photosynthetic decrease to stomatal closure.
- Taxon
- potatoSolanum tuberosumt0
- Interactor
- V. dahliaeVerticillium dahliaee0pathogen
- Outcome
- initial decrease in photosynthesise0
- Qualifier
- stomatal closuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the initial decrease in photosynthesis caused by V. dahliae was caused by stomatal closure”
t0“Mechanism of Photosynthesis Decrease by Verticillium dahliae in Potato”
Claim · model-written summary
Patchiness in carbon assimilation was found at low frequency.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- Patchinesse0
- Qualifier
- low frequencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Patchiness was found at a low frequency”
t0“Mechanism of Photosynthesis Decrease by Verticillium dahliae in Potato”
Claim · model-written summary
Low stomatal conductance correlated with low leaf water potentials.
- Taxon
- potatoSolanum tuberosumt0
- Organ / stage
- leafe0
- Outcome
- stomatal conductancee0
- Direction
- Lowe0
- Qualifier
- low leaf water potentialse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low stomatal conductance was correlated with low leaf water potentials”
t0“Mechanism of Photosynthesis Decrease by Verticillium dahliae in Potato”
Claim · model-written summary
Infection did not affect leaf osmotic potential.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Infectione0
- Outcome
- leaf osmotic potentialse0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Infection did not affect leaf osmotic potentials”
t0“Mechanism of Photosynthesis Decrease by Verticillium dahliae in Potato”
The same questions in other papers
infection · physiology: photosynthesis · Solanum tuberosum (potato)Results agree
6 papers in the same direction as this paper
- negative
- negative
- negative
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.