Abstract
The effects of external salt and inorganic phosphate (Pi) on the concentrations of vacuolar Pi, and cytoplasmic Pi, ATP, glucose-6-phosphate and UDP-glucose in maize root tips were examined using (31)P nuclear magnetic resonance spectroscopy. We observed a more than two-fold stimulation of Pi uptake from 10 millimolar KH(2)PO(4) solutions when root tips were exposed to 100 millimolar NaCl + CaCl(2). This stimulation of Pi uptake was associated with an increase in the concentration of cytoplasmic Pi in root tip cells. Thus, the molar ratio of cytoplasmic Pi to Pi + ATP + glucose-6-phosphate + UDP-glucose increased greatly in root tips exposed to salt and Pi. We speculate that it is this disturbance in relative concentrations of cytoplasmic phosphates (which we show are normally tightly regulated) that is responsible for both the greater rate of uptake of Pi by vacuoles of excised maize root tips, and the previously documented stimulation of Pi translocation from root to shoot in whole maize plants exposed to salt and Pi.
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Claims 5
Claim · model-written summary
Salt stimulated phosphate uptake more than twofold.
- Organ / stage
- root tipse0
- Treatment
- 100 millimolar NaCl + CaCl(2)e0
- Outcome
- Pi uptakee0
- Direction
- stimulatione0
- Value
- more than two-folde0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“more than two-fold stimulation of Pi uptake from 10 millimolar KH(2)PO(4) solutions when root tips were exposed to 100 millimolar NaCl + CaCl(2)”
t0“Maize Root Tips”
Claim · model-written summary
Salt stimulation was associated with increased cytoplasmic phosphate concentration.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This stimulation of Pi uptake was associated with an increase in the concentration of cytoplasmic Pi in root tip cells”
t0“maize root tips”
Claim · model-written summary
The cytoplasmic Pi ratio increased greatly under salt and Pi.
- Organ / stage
- root tipse0
- Treatment
- salt and Pie0
- Outcome
- molar ratio of cytoplasmic Pi to Pi + ATP + glucose-6-phosphate + UDP-glucosee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the molar ratio of cytoplasmic Pi to Pi + ATP + glucose-6-phosphate + UDP-glucose increased greatly in root tips exposed to salt and Pi”
t0“Maize Root Tips”
Claim · model-written summary
The authors propose disturbed phosphate balance drives increased vacuolar Pi uptake.
- Outcome
- greater rate of uptake of Pi by vacuolese0
- Qualifier
- disturbance in relative concentrations of cytoplasmic phosphatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this disturbance in relative concentrations of cytoplasmic phosphates (which we show are normally tightly regulated) that is responsible for both the greater rate of uptake of Pi by vacuoles of excised maize root tips”
Claim · model-written summary
The authors propose disturbed phosphate balance drives increased root-to-shoot Pi translocation.
- Outcome
- stimulation of Pi translocation from root to shoote0
- Qualifier
- disturbance in relative concentrations of cytoplasmic phosphatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this disturbance in relative concentrations of cytoplasmic phosphates (which we show are normally tightly regulated) that is responsible for both the greater rate of uptake of Pi by vacuoles of excised maize root tips, and the previously documented stimulation of Pi translocation from root to shoot in whole maize plants exposed to salt and Pi”
The same questions in other papers
calcium dichloride · nutrient: content · Zea mays (maize)Positive and negative results
3 in the opposite direction
- negative
- negative
- negative
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.