Abstract
This study was undertaken to elucidate the photosynthetic activity, carbohydrate metabolism, translocation of assimilates and mineral nutrient uptake in young tomato plants at very low carbon dioxide concentrations.Radioisotopes of 14CO2, H332PO4 and 86RbCl were used as tracers under controlled conditions. Photosynthetic rates were also measured with gas exchange method by means of assimilation chambers and an infrared gas analyser.Photosynthetic rate of tomato leaf was linearly proportional to the CO2 concentration within the range from 70 to 300ppm CO2 at three light intensities of 0.07, 0.16 and 0.53 cal•cm-2•min-1. In an atmosphere containing 80ppm CO2, total activity of 14C fixed into the plants dropped to 35 per cent of the normal, and at the same time significant decrease was observed in the translocation of 14C-assimilates from the leaves to the roots.Fairly good amount of 14C-compounds, fixed in the evening and remained in the leaf till next morning, was translocated into the roots under normal photosynthetic conditions. In a CO2-deficient atmosphere, however, a downward translocation of 14C-compounds was slightly restricted and respiratory losses of 14C-compounds were considerably increased in the leaf.Tomato plants placed in an atmosphere containing 60ppm CO2 for 2 hours had lower level of carbohydrates in the leaf and root.A remarkable increase in 32P uptake was found at very low CO2 concentration in the tomato plants which had been illuminated for 6 hours before 32P-treatment. In contrast, the CO2 depletion caused marked decrease in the 32P uptake for the unlighted plants.The uptake of 86Rb was considerably restricted at low CO2 concentration both in the lighted and unlighted plants. The absorption and accumulation of rubidium were highly dependent on the photosynthetic activity in the tomato plants.From these results, the relationship between the translocation of assimilates and the uptake of mineral nutrients was discussed from physiological point of view.
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Claims 11
Claim · model-written summary
Photosynthetic rate of tomato leaf increased linearly with CO2 concentration from 70 to 300ppm at three light intensities.
- Taxon
- tomato
Solanum lycopersicume0 - Organ / stage
- leafe0
- Treatment
- CO2 concentratione0
- Outcome
- Photosynthetic ratee0
- Direction
- increaseinferrede0
- Qualifier
- 70 to 300ppm CO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic rate of tomato leaf was linearly proportional to the CO2 concentration within the range from 70 to 300ppm CO2 at three light intensities of 0.07, 0.16 and 0.53 cal•cm-2•min-1”
Claim · model-written summary
In an atmosphere with 80ppm CO2, total 14C fixed into young tomato plants dropped to 35 per cent of normal.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- 80ppm CO2e1
- Outcome
- total activity of 14C fixed into the plantse1
- Direction
- droppede1
- Value
- 35 per cente1
- Comparator
- the normale1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“young tomato plants”
e1“In an atmosphere containing 80ppm CO2, total activity of 14C fixed into the plants dropped to 35 per cent of the normal”
Claim · model-written summary
At 80ppm CO2, translocation of 14C-assimilates from leaves to roots in tomato decreased significantly.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- 80ppm CO2e1
- Outcome
- translocation of 14C-assimilates from the leaves to the rootse2
- Direction
- decreasee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“young tomato plants”
e1“In an atmosphere containing 80ppm CO2”
e2“significant decrease was observed in the translocation of 14C-assimilates from the leaves to the roots”
Claim · model-written summary
Under normal photosynthetic conditions a fairly good amount of 14C-compounds fixed in the evening was translocated into the roots of tomato by next morning.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- rootse1
- Outcome
- translocated into the rootse1
- Qualifier
- under normal photosynthetic conditionse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“young tomato plants”
e1“Fairly good amount of 14C-compounds, fixed in the evening and remained in the leaf till next morning, was translocated into the roots under normal photosynthetic conditions”
Claim · model-written summary
In a CO2-deficient atmosphere, downward translocation of 14C-compounds in tomato was slightly restricted.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- CO2-deficient atmospheree1
- Outcome
- downward translocation of 14C-compoundse1
- Direction
- slightly restrictede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“young tomato plants”
e1“In a CO2-deficient atmosphere, however, a downward translocation of 14C-compounds was slightly restricted and respiratory losses of 14C-compounds were considerably increased in the leaf”
Claim · model-written summary
In a CO2-deficient atmosphere, respiratory losses of 14C-compounds in tomato leaf were considerably increased.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- leafe1
- Treatment
- CO2-deficient atmospheree1
- Outcome
- respiratory losses of 14C-compoundse1
- Direction
- considerably increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“young tomato plants”
e1“In a CO2-deficient atmosphere, however, a downward translocation of 14C-compounds was slightly restricted and respiratory losses of 14C-compounds were considerably increased in the leaf”
Claim · model-written summary
Tomato plants held for 2 hours at 60ppm CO2 had lower carbohydrate levels in leaf and root.
- Taxon
- Tomato plantsSolanum lycopersicume0
- Organ / stage
- leaf and roote0
- Treatment
- 60ppm CO2 for 2 hourse0
- Outcome
- level of carbohydratese0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants placed in an atmosphere containing 60ppm CO2 for 2 hours had lower level of carbohydrates in the leaf and root”
Claim · model-written summary
Very low CO2 markedly increased 32P uptake in tomato plants illuminated for 6 hours before 32P treatment.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- very low CO2 concentratione0
- Outcome
- 32P uptakee0
- Direction
- increasee0
- Qualifier
- illuminated for 6 hours before 32P-treatmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A remarkable increase in 32P uptake was found at very low CO2 concentration in the tomato plants which had been illuminated for 6 hours before 32P-treatment”
Claim · model-written summary
CO2 depletion caused a marked decrease in 32P uptake in unlighted tomato plants.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- CO2 depletione1
- Outcome
- 32P uptakee1
- Direction
- marked decreasee1
- Qualifier
- unlighted plantse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“young tomato plants”
e1“the CO2 depletion caused marked decrease in the 32P uptake for the unlighted plants”
Claim · model-written summary
Uptake of 86Rb in tomato was considerably restricted at low CO2 in both lighted and unlighted plants.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- low CO2 concentratione1
- Outcome
- uptake of 86Rbe1
- Direction
- considerably restrictede1
- Qualifier
- both in the lighted and unlighted plantse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“young tomato plants”
e1“The uptake of 86Rb was considerably restricted at low CO2 concentration both in the lighted and unlighted plants”
Claim · model-written summary
Absorption and accumulation of rubidium in tomato plants were highly dependent on photosynthetic activity.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- photosynthetic activitye0
- Outcome
- absorption and accumulation of rubidiume0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The absorption and accumulation of rubidium were highly dependent on the photosynthetic activity in the tomato plants”
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See all 22 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.