Abstract
Abstract The polyvalent cation‐stimulated uptake of phosphate (P) by plant roots has been acknowledged for some time. However, the mechanism of this stimulation and the site of activity have been poorly defined. Most evidence indicates that mitochondria are involved with ion uptake, thus suggesting the possibility that the polyvalent cation stimulation of P uptake by plant roots might be associated with mitochondria. This paper correlates the P accumulation ( 32 P) by isolated corn ( Zea mays L.) shoot mitochondria and intact corn roots in the presence of various known inhibitors of electron transport or phosphorylation. In both intact roots and isolated mitochondria, Ca +2 treatment stimulated the uptake of P when compared to either Mg +2 treatment or control treatment. But a ratio of 4 m M Ca:l m M Mg produced optimal stimulation of P uptake when compared to other ratios of these cations. Oligomycin, azide, and 2,4‐dinitrophenol reduced the uptake of P by whole roots, but only 2,4‐dinitrophenol abolished the Ca +2 preferential stimulation of P uptake. These results are compared to similar studies with isolated mitochondria and suggest that the accumulation of P by intact corn roots is at least partially controlled by mitochondria and that the Ca +2 stimulation of P uptake by roots may be explained in terms of mitochondrial reactions.
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Claims 9
Claim · model-written summary
Calcium stimulated phosphorus uptake in intact corn roots compared with magnesium or control.
- Taxon
- corn
Zea mays subsp. mayst0 - Organ / stage
- intact rootse0
- Treatment
- Ca +2 treatmente0
- Outcome
- uptake of Pe0
- Direction
- stimulatede0
- Comparator
- Mg +2 treatment or control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both intact roots and isolated mitochondria, Ca +2 treatment stimulated the uptake of P when compared to either Mg +2 treatment or control treatment.”
t0“Corn”
Claim · model-written summary
Calcium stimulated phosphorus uptake in isolated corn mitochondria compared with magnesium or control.
- Taxon
- cornZea mays subsp. mayst0
- Organ / stage
- isolated mitochondriae0
- Treatment
- Ca +2 treatmente0
- Outcome
- uptake of Pe0
- Direction
- stimulatede0
- Comparator
- Mg +2 treatment or control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both intact roots and isolated mitochondria, Ca +2 treatment stimulated the uptake of P when compared to either Mg +2 treatment or control treatment.”
t0“Corn”
Claim · model-written summary
A 4 m M Ca:l m M Mg ratio gave optimal phosphorus uptake stimulation.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- 4 m M Ca:l m M Mge0
- Outcome
- P uptakee0
- Direction
- optimal stimulatione0
- Value
- 4 m M Ca:l m M Mge0
- Comparator
- other ratios of these cationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a ratio of 4 m M Ca:l m M Mg produced optimal stimulation of P uptake when compared to other ratios of these cations.”
t0“Corn”
Claim · model-written summary
Oligomycin reduced phosphorus uptake by whole roots.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Oligomycine0
- Outcome
- uptake of P by whole rootse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oligomycin, azide, and 2,4‐dinitrophenol reduced the uptake of P by whole roots”
t0“Corn”
Claim · model-written summary
Azide reduced phosphorus uptake by whole roots.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- azidee0
- Outcome
- uptake of P by whole rootse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oligomycin, azide, and 2,4‐dinitrophenol reduced the uptake of P by whole roots”
t0“Corn”
Claim · model-written summary
2,4‐dinitrophenol reduced phosphorus uptake by whole roots.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- 2,4‐dinitrophenole0
- Outcome
- uptake of P by whole rootse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oligomycin, azide, and 2,4‐dinitrophenol reduced the uptake of P by whole roots”
t0“Corn”
Claim · model-written summary
Only 2,4‐dinitrophenol abolished calcium preferential stimulation of phosphorus uptake.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- 2,4‐dinitrophenole0
- Outcome
- Ca +2 preferential stimulation of P uptakee0
- Direction
- abolishede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only 2,4‐dinitrophenol abolished the Ca +2 preferential stimulation of P uptake.”
t0“Corn”
Claim · model-written summary
The authors suggest mitochondrial control of phosphorus accumulation by intact corn roots.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- accumulation of P by intact corn rootse0
- Qualifier
- at least partially controlled by mitochondriae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the accumulation of P by intact corn roots is at least partially controlled by mitochondria”
Claim · model-written summary
The authors suggest that mitochondrial reactions explain calcium stimulation of root phosphorus uptake.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- Ca +2 stimulation of P uptake by rootse0
- Qualifier
- mitochondrial reactionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the Ca +2 stimulation of P uptake by roots may be explained in terms of mitochondrial reactions.”
t0“Corn”
The same questions in other papers
oligomycin · nutrient: content · Zea mays (maize)Positive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
3 papers more in this group
See all 7 papers →calcium atom · nutrient: content · Zea mays (maize)Positive and negative results
20 papers in the same direction as this paper · 5 in the opposite direction
- no effect
- negative
- no effect
22 papers more in this group
See all 26 papers →magnesium atom · nutrient: content · Zea mays (maize)Positive and negative results
18 papers in the same direction as this paper · 8 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- no effect
- no effect
24 papers more in this group
See all 28 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.