Abstract
The rate of uptake of 32P from labelled NaH2PO4 solutions sprayed on to one leaf of swedes (Brassica napus) or French beans (Phaseolus vulgaris) was rapid during the first few hours and fell to zero after 4 days. 22P was detected in the root after 3 hours and continued to move out of the treated leaf for at least 6 days after application. A larger fraction of the applied 32P was absorbed from repeated than from a single spraying. Swedes absorbed more 32P from a single application to the lower surface than to the upper surface of the leaf. Doubling the concentration of the spray caused a small increase in the percentage of applied 22P that was absorbed. Absorption by French-bean leaves decreased slightly when the area sprayed with a constant amount of 32P was doubled, and decreased with increasing age of leaf. Increasing the phosphorus supply to the roots of swedes affected neither the initial rate nor the total amount of 32P uptake by the leaves but decreased the quantity of 32P that was translocated out of the treated leaf. Increasing the relative humidity of the air around the plants also increased32P uptake. Shading usually decreased uptake and always decreased translocation. Rewetting the leaf to which the 32P had been applied, with water or sucrose solution, had variable effects. The significance of the results is discussed.
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Claims 15
Claim · model-written summary
Foliar 32P uptake was rapid initially and fell to zero after four days.
- Taxon
- swedes (Brassica napus) or French beans (Phaseolus vulgaris)
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napus
Phaseolus vulgarise0 - Outcome
- rate of uptake of 32Pe0
- Direction
- fell to zeroe0
- Value
- 4 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“The rate of uptake of 32P from labelled NaH2PO4 solutions sprayed on to one leaf of swedes (Brassica napus) or French beans (Phaseolus vulgaris) was rapid during the first few hours and fell to zero after 4 days”
Claim · model-written summary
Phosphorus was detected in roots after three hours and continued moving from treated leaves for at least six days.
Verbatim
e0“22P was detected in the root after 3 hours and continued to move out of the treated leaf for at least 6 days after application”
t0“Plant”
Claim · model-written summary
Repeated spraying absorbed more applied 32P than a single spray.
Verbatim
e0“A larger fraction of the applied 32P was absorbed from repeated than from a single spraying”
t0“Plant”
Claim · model-written summary
Swedes absorbed more 32P from lower than upper leaf-surface application.
Verbatim
e0“Swedes absorbed more 32P from a single application to the lower surface than to the upper surface of the leaf”
Claim · model-written summary
Doubling spray concentration slightly increased absorbed phosphorus percentage.
- Taxon
- Plantt0
- Treatment
- Doubling the concentration of the spraye0
- Outcome
- percentage of applied 22P that was absorbede0
- Direction
- increasee0
Not reportedComparator
Verbatim
e0“Doubling the concentration of the spray caused a small increase in the percentage of applied 22P that was absorbed”
t0“Plant”
Claim · model-written summary
Doubling sprayed area slightly decreased absorption by French-bean leaves.
- Taxon
- French-beanPhaseolus vulgarise0
- Treatment
- area sprayed with a constant amount of 32P was doublede0
- Outcome
- Absorptione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Absorption by French-bean leaves decreased slightly when the area sprayed with a constant amount of 32P was doubled”
Claim · model-written summary
Absorption by French-bean leaves decreased with increasing leaf age.
- Taxon
- French-beanPhaseolus vulgarise0
- Organ / stage
- age of leafe0
- Outcome
- Absorptione0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Absorption by French-bean leaves decreased slightly when the area sprayed with a constant amount of 32P was doubled, and decreased with increasing age of leaf”
Claim · model-written summary
More root phosphorus did not affect initial foliar 32P uptake rate.
- Taxon
- swedese0
- Treatment
- Increasing the phosphorus supply to the rootse0
- Outcome
- initial ratee0
- Direction
- affected neithere0
Not reportedComparator
Verbatim
e0“Increasing the phosphorus supply to the roots of swedes affected neither the initial rate nor the total amount of 32P uptake by the leaves”
Claim · model-written summary
More root phosphorus did not affect total foliar 32P uptake.
- Taxon
- swedese0
- Treatment
- Increasing the phosphorus supply to the rootse0
- Outcome
- total amount of 32P uptakee0
- Direction
- affected neithere0
Not reportedComparator
Verbatim
e0“Increasing the phosphorus supply to the roots of swedes affected neither the initial rate nor the total amount of 32P uptake by the leaves”
Claim · model-written summary
More root phosphorus decreased 32P translocation out of the treated leaf.
- Taxon
- swedese0
- Treatment
- Increasing the phosphorus supply to the rootse0
- Outcome
- quantity of 32P that was translocated out of the treated leafe0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“Increasing the phosphorus supply to the roots of swedes affected neither the initial rate nor the total amount of 32P uptake by the leaves but decreased the quantity of 32P that was translocated out of the treated leaf”
Claim · model-written summary
Higher relative humidity increased 32P uptake.
- Taxon
- Plantt0
- Treatment
- Increasing the relative humidity of the aire0
- Outcome
- 32P uptakee0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Increasing the relative humidity of the air around the plants also increased32P uptake”
t0“Plant”
Claim · model-written summary
Shading usually decreased uptake.
Not reportedComparator
Verbatim
e0“Shading usually decreased uptake”
t0“Plant”
Claim · model-written summary
Shading always decreased translocation.
Not reportedComparator
Verbatim
e0“Shading usually decreased uptake and always decreased translocation”
t0“Plant”
Claim · model-written summary
Rewetting treated leaves with water had variable effects.
Not reportedComparatorDirection
Verbatim
e0“Rewetting the leaf to which the 32P had been applied, with water or sucrose solution, had variable effects”
t0“Plant”
Claim · model-written summary
Rewetting treated leaves with sucrose solution had variable effects.
Not reportedComparatorDirection
Verbatim
e0“Rewetting the leaf to which the 32P had been applied, with water or sucrose solution, had variable effects”
t0“Plant”
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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.