Abstract
Seedlings of barley were grown to the 3-leaf stage in phosphate-free nutrient solution and AT was added at such times that the roots were in contact with 100 p.p.m. of the compound for 96, 48, 24, 4, 1, or 0 hours immediately prior to transfer to labelled phosphate solution for 1 hour. The plants were then returned to phosphate-free nutrient solution and harvested 1, 2, 4, 24, 48, and 96 hours after the start of the contact with radioactive solution. In an experiment designed to determine the effect on utilization of phosphate the immersion in AT was of 48 hours' duration.Exposure to AT diminished uptake of P 32 but also decreased the subsequent loss to the environment. The activity in both acid-soluble and acid-insoluble fractions of the root was reduced by treatment but exposure to AT for up to 48 hours increased the amount of P 32 translocated to the shoot. The proportion of the absorbed phosphate found in the shoots of treated plants was higher than in the controls.For 2 to 4 hours the incorporation of P 32 into both acid-insoluble (nucleic acids, phospholipids, phosphoprotein) and acid-soluble (nucleotides, sugar phosphates, inorganic phosphate) fractions showed little deviation from normal, but by the end of 24 hours AT treatment caused a decrease in the acid-insoluble fraction of both roots and shoots. The pattern of esterification was changed but little.Apparently the effect of AT on phosphate metabolism is not concerned with the reactions of oxidative phosphorylation or of glycolysis, but is confined to the processes involved in the incorporation of phosphate during the synthesis of nucleic acids.
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Claims 9
Claim · model-written summary
AT reduced phosphorus-32 uptake.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- ATe0
- Outcome
- uptake of P 32e0
- Direction
- diminishede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Exposure to AT diminished uptake of P 32 but also decreased the subsequent loss to the environment.”
t0“Seedlings of barley”
Claim · model-written summary
AT reduced subsequent phosphorus-32 loss to the environment.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- ATe0
- Outcome
- subsequent loss to the environmente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to AT diminished uptake of P 32 but also decreased the subsequent loss to the environment.”
t0“Seedlings of barley”
Claim · model-written summary
AT reduced activity in acid-soluble root fractions.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- roote0
- Treatment
- ATe0
- Outcome
- activity in both acid-soluble and acid-insoluble fractions of the roote0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activity in both acid-soluble and acid-insoluble fractions of the root was reduced by treatment but exposure to AT for up to 48 hours increased the amount of P 32 translocated to the shoot.”
t0“Seedlings of barley”
Claim · model-written summary
AT increased phosphorus-32 translocation to shoots after up to 48 hours of exposure.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- shoote0
- Treatment
- ATe0
- Outcome
- amount of P 32 translocated to the shoote0
- Direction
- increasede0
- Qualifier
- up to 48 hourse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activity in both acid-soluble and acid-insoluble fractions of the root was reduced by treatment but exposure to AT for up to 48 hours increased the amount of P 32 translocated to the shoot.”
t0“Seedlings of barley”
Claim · model-written summary
Treated plants had a higher share of absorbed phosphate in shoots than controls.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- shootse0
- Treatment
- ATe0
- Outcome
- proportion of the absorbed phosphate found in the shootse0
- Direction
- highere0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The proportion of the absorbed phosphate found in the shoots of treated plants was higher than in the controls.”
t0“Seedlings of barley”
Claim · model-written summary
Phosphorus-32 incorporation into acid-insoluble and acid-soluble fractions changed little during the first 2 to 4 hours.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- ATe0
- Outcome
- incorporation of P 32 into both acid-insoluble (nucleic acids, phospholipids, phosphoprotein) and acid-soluble (nucleotides, sugar phosphates, inorganic phosphate) fractionse0
- Direction
- little deviatione0
- Qualifier
- For 2 to 4 hourse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For 2 to 4 hours the incorporation of P 32 into both acid-insoluble (nucleic acids, phospholipids, phosphoprotein) and acid-soluble (nucleotides, sugar phosphates, inorganic phosphate) fractions showed little deviation from normal, but by the end of 24 hours AT treatment caused a decrease in the acid-insoluble fraction of both roots and shoots.”
t0“Seedlings of barley”
Claim · model-written summary
AT decreased the acid-insoluble fraction of roots and shoots by 24 hours.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- roots and shootse0
- Treatment
- ATe0
- Outcome
- acid-insoluble fraction of both roots and shootse0
- Direction
- decreasee0
- Qualifier
- by the end of 24 hourse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For 2 to 4 hours the incorporation of P 32 into both acid-insoluble (nucleic acids, phospholipids, phosphoprotein) and acid-soluble (nucleotides, sugar phosphates, inorganic phosphate) fractions showed little deviation from normal, but by the end of 24 hours AT treatment caused a decrease in the acid-insoluble fraction of both roots and shoots.”
t0“Seedlings of barley”
Claim · model-written summary
AT changed the esterification pattern only slightly.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- ATe0
- Outcome
- pattern of esterificatione0
- Direction
- changed but littlee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The pattern of esterification was changed but little.”
t0“Seedlings of barley”
Claim · model-written summary
The authors attributed the phosphate metabolism effect to phosphate incorporation during nucleic acid synthesis.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- effect of AT on phosphate metabolisme0
- Qualifier
- processes involved in the incorporation of phosphate during the synthesis of nucleic acidse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Apparently the effect of AT on phosphate metabolism is not concerned with the reactions of oxidative phosphorylation or of glycolysis, but is confined to the processes involved in the incorporation of phosphate during the synthesis of nucleic acids.”
t0“Seedlings of barley”