Abstract
Abstract The effect of K deficiency on sucrose transport was studied in bean plants from which the cotyledons had been removed soon after germination and which were subsequently grown in culture solution. Labelled sucrose wassupplied to the primary leaf. Mild Kdeficiency depressed translocation. A statistically significant interaction between the presence of K and light was observed. K deficiency had no effect on translocation if the plants had been placed in the dark before the experiment and remained in the dark during the translocationperiod. Maximum correction for differences in the specific activity of the sugar being translocated, as between control and K‐deficient plants (based on sugar analyses in various plant parts), failed to abolish the K effect when the amount of sugar applied was relatively low (high specific activity). On the other hand no effect of K‐deficiency was observed on translocation when the amount of applied sugar was high (low specific activity). In this case 14 CO 2 fixation was greatly reduced in the controls, but not in the K‐deficient plants. Significant interaction existed between added sugar and K‐deficiency on 14 CO 2 fixation. All results reported here can be explained on the basis of a scheme whereby K plays a rôle in reversible intermediate steps between sugar formation in the chloroplast and the entry of this photosynthesised sugar into the “translocation pool” where it mixes with exogenous sugar.
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Claims 8
Claim · model-written summary
Mild potassium deficiency depressed sucrose translocation.
Not reportedComparator
Verbatim
e0“Mild Kdeficiency depressed translocation”
t0“Bean Plants”
Claim · model-written summary
Potassium presence and light interacted significantly in translocation.
- Taxon
- Bean Plantst0
- Treatment
- presence of K and lighte0
- Outcome
- interaction between the presence of K and lighte0
Not reportedDirection
Verbatim
e0“A statistically significant interaction between the presence of K and light was observed”
t0“Bean Plants”
Claim · model-written summary
Potassium deficiency did not affect translocation in plants kept dark.
- Taxon
- Bean Plantst0
- Treatment
- K deficiencye0
- Outcome
- translocatione0
- Direction
- no effecte0
- Qualifier
- placed in the dark before the experiment and remained in the darke0
Not reportedComparator
Verbatim
e0“K deficiency had no effect on translocation if the plants had been placed in the dark before the experiment and remained in the dark during the translocationperiod”
t0“Bean Plants”
Claim · model-written summary
Correction for differences in sugar specific activity did not abolish the potassium effect at low sugar application.
Verbatim
e0“Maximum correction for differences in the specific activity of the sugar being translocated, as between control and K‐deficient plants (based on sugar analyses in various plant parts), failed to abolish the K effect when the amount of sugar applied was relatively low (high specific activity)”
t0“Bean Plants”
Claim · model-written summary
Potassium deficiency did not affect translocation when sugar application was high.
- Taxon
- Bean Plantst0
- Treatment
- K‐deficiencye0
- Outcome
- translocatione0
- Direction
- no effecte0
- Qualifier
- amount of applied sugar was high (low specific activity)e0
Not reportedComparator
Verbatim
e0“no effect of K‐deficiency was observed on translocation when the amount of applied sugar was high (low specific activity)”
t0“Bean Plants”
Claim · model-written summary
High applied sugar greatly reduced carbon dioxide fixation in controls but not potassium-deficient plants.
Not reportedTreatment
Verbatim
e0“In this case 14 CO 2 fixation was greatly reduced in the controls, but not in the K‐deficient plants”
t0“Bean Plants”
Claim · model-written summary
Added sugar and potassium deficiency interacted significantly on carbon dioxide fixation.
Not reportedDirection
Verbatim
e0“Significant interaction existed between added sugar and K‐deficiency on 14 CO 2 fixation”
t0“Bean Plants”
Claim · model-written summary
The authors explain the results with a potassium role in intermediate steps from chloroplast sugar formation to the translocation pool.
Verbatim
e0“K plays a rôle in reversible intermediate steps between sugar formation in the chloroplast and the entry of this photosynthesised sugar into the “translocation pool””
t0“Bean Plants”
The same questions in other papers
potassium · nutrient: content · Phaseolus vulgaris (common bean)Positive and negative results
1 paper in the same direction as this paper · 5 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- positive
- positive
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.