Abstract
Reduction in the supply of photosynthate to the roots of tomato, barley, and wheat plants was achieved indirectly by lowering the intensity of sunlight striking the foliage of test plants. The decrease in sugar and starch concentrations in the roots was verified by appropriate extraction and colorimetric analysis, and a corresponding reduction in the total respiratory rate of the roots was confirmed using an oxygen tension monitor. Other processes measured directly include the rate of uptake of potassium, the mitotic quotient in the root tip—a measure of growth—and the rate of accumulation of dry matter in the root. The study demonstrated that of the metabolic activities observed, root growth is the process first limited when the supply of photosynthetic fuel is decreased. Root growth was severely inhibited under conditions that did not significantly affect either the active uptake of potassium per gram of root or total respiration per gram of root. With greater restriction of photosynthesis, growth was completely halted while the uptake of potassium was strongly decreased and total respiration was still affected only moderately. As the light intensity is reduced significantly, most of the reduced energy supply in the root appears to be used in support of processes critical to maintenance of the organ and the organism.
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Claims 7
Claim · model-written summary
Root growth was the first metabolic process limited when photosynthate supply to the roots of tomato, barley and wheat was reduced.
- Taxon
- tomato, barley, and wheat
Solanum lycopersicum.jpg?width=60)
Hordeum vulgare
Triticum aestivume0 - Treatment
- lowering the intensity of sunlight striking the foliagee0
- Outcome
- root growthe1
- Direction
- first limitede1
- Comparator
- the metabolic activities observede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Reduction in the supply of photosynthate to the roots of tomato, barley, and wheat plants was achieved indirectly by lowering the intensity of sunlight striking the foliage of test plants”
e1“of the metabolic activities observed, root growth is the process first limited when the supply of photosynthetic fuel is decreased”
Claim · model-written summary
Root growth was severely inhibited under reduced photosynthate supply to roots.
- Taxon
- tomato, barley, and wheatSolanum lycopersicumHordeum vulgareTriticum aestivume0
- Treatment
- lowering the intensity of sunlight striking the foliagee0
- Outcome
- Root growthe2
- Direction
- severely inhibitede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction in the supply of photosynthate to the roots of tomato, barley, and wheat plants was achieved indirectly by lowering the intensity of sunlight striking the foliage of test plants”
e2“Root growth was severely inhibited under conditions that did not significantly affect either the active uptake of potassium per gram of root or total respiration per gram of root”
Claim · model-written summary
Under the same reduced photosynthate supply, the active uptake of potassium per gram of root and total respiration per gram of root were not significantly affected.
- Taxon
- tomato, barley, and wheatSolanum lycopersicumHordeum vulgareTriticum aestivume0
- Treatment
- lowering the intensity of sunlight striking the foliagee0
- Outcome
- the active uptake of potassium per gram of root or total respiration per gram of roote2
- Direction
- did not significantly affecte2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction in the supply of photosynthate to the roots of tomato, barley, and wheat plants was achieved indirectly by lowering the intensity of sunlight striking the foliage of test plants”
e2“Root growth was severely inhibited under conditions that did not significantly affect either the active uptake of potassium per gram of root or total respiration per gram of root”
Claim · model-written summary
With greater restriction of photosynthesis, root growth was completely halted.
- Taxon
- tomato, barley, and wheatSolanum lycopersicumHordeum vulgareTriticum aestivume0
- Treatment
- greater restriction of photosynthesise3
- Outcome
- growthe3
- Direction
- completely haltede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction in the supply of photosynthate to the roots of tomato, barley, and wheat plants was achieved indirectly by lowering the intensity of sunlight striking the foliage of test plants”
e3“With greater restriction of photosynthesis, growth was completely halted while the uptake of potassium was strongly decreased and total respiration was still affected only moderately”
Claim · model-written summary
With greater restriction of photosynthesis, the uptake of potassium was strongly decreased.
- Taxon
- tomato, barley, and wheatSolanum lycopersicumHordeum vulgareTriticum aestivume0
- Treatment
- greater restriction of photosynthesise3
- Outcome
- uptake of potassiume3
- Direction
- strongly decreasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction in the supply of photosynthate to the roots of tomato, barley, and wheat plants was achieved indirectly by lowering the intensity of sunlight striking the foliage of test plants”
e3“With greater restriction of photosynthesis, growth was completely halted while the uptake of potassium was strongly decreased and total respiration was still affected only moderately”
Claim · model-written summary
With greater restriction of photosynthesis, total respiration was still affected only moderately.
- Taxon
- tomato, barley, and wheatSolanum lycopersicumHordeum vulgareTriticum aestivume0
- Treatment
- greater restriction of photosynthesise3
- Outcome
- total respiratione3
- Direction
- affected only moderatelye3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction in the supply of photosynthate to the roots of tomato, barley, and wheat plants was achieved indirectly by lowering the intensity of sunlight striking the foliage of test plants”
e3“With greater restriction of photosynthesis, growth was completely halted while the uptake of potassium was strongly decreased and total respiration was still affected only moderately”
Claim · model-written summary
Most of the reduced energy supply in the root appears to support processes critical to maintenance of the organ and the organism when light intensity is reduced significantly.
- Taxon
- tomato, barley, and wheatSolanum lycopersicumHordeum vulgareTriticum aestivume0
- Treatment
- light intensity is reduced significantlye4
- Outcome
- most of the reduced energy supply in the roote4
- Qualifier
- processes critical to maintenance of the organ and the organisme4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction in the supply of photosynthate to the roots of tomato, barley, and wheat plants was achieved indirectly by lowering the intensity of sunlight striking the foliage of test plants”
e4“As the light intensity is reduced significantly, most of the reduced energy supply in the root appears to be used in support of processes critical to maintenance of the organ and the organism”
The same questions in other papers
light · physiology: respiration · Solanum lycopersicum (tomato)Results differ
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- positive
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See all 85 papers →light · growth · Solanum lycopersicum (tomato)Positive and negative results
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See all 226 papers →light · physiology: respiration · Triticum aestivum (wheat)Results agree
1 paper in the same direction as this paper
- no effect
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.