Abstract
Excised corn root tissue has been evaluated for its viability, integrity of compartmentation, intracellular pH gradients, total mobile phosphorus content and nucleotide concentrations under different levels of acidity, and mineral stresses using in vivo(31)P nuclear magnetic resonance spectroscopy at 21 to 23 degrees C. Perfusion with Al(3+) ion at low pH (4.0) for 20 hours caused the overall concentration of nucleotides in the cytoplasm to decrease significantly relative to the control. Respiratory activity as measured by O(2) uptake decreased by a comparable amount over this time period. The addition of glucose to the Al-containing perfusate negated the inhibitory effects on the respiratory system. Treatment of the tissue with paramagnetic manganese ion while perfusing in the presence of O(2) allowed for the observation of the sequence of events leading to the irreversible trapping of Mn(2+) in the vacuole. Pretreatment of the roots with Mg(2+) prevented Mn(2+) migration to the vacuole over the time period of this experiment. Hypoxia prevented all but a limited uptake of Mn(2+) into the cytoplasm of the root tips. No evidence of Mn(2+) complexation of either cytoplasmic or vacuole Pi suggests that the energy derived from O(2) consuming processes is necessary for the facilitated movement of this divalent cation.
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Claims 8
Claim · model-written summary
Aluminium perfusion significantly decreased cytoplasmic nucleotide concentration.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- Al(3+) ion at low pH (4.0) for 20 hourse0
- Outcome
- overall concentration of nucleotides in the cytoplasme0
- Direction
- decreasee0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Perfusion with Al(3+) ion at low pH (4.0) for 20 hours caused the overall concentration of nucleotides in the cytoplasm to decrease significantly relative to the control.”
t0“Corn Root Tissue”
Claim · model-written summary
Respiratory activity fell by a comparable amount.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Al(3+)e0
- Outcome
- Respiratory activity as measured by O(2) uptakee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Perfusion with Al(3+) ion at low pH (4.0) for 20 hours caused the overall concentration of nucleotides in the cytoplasm to decrease significantly relative to the control. Respiratory activity as measured by O(2) uptake decreased by a comparable amount over this time period.”
t0“Corn Root Tissue”
Claim · model-written summary
Glucose addition negated aluminium inhibition of respiration.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- glucosee0
- Outcome
- inhibitory effects on the respiratory systeme0
- Direction
- negatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The addition of glucose to the Al-containing perfusate negated the inhibitory effects on the respiratory system.”
t0“Corn Root Tissue”
Claim · model-written summary
Manganese treatment led to irreversible vacuolar trapping of Mn(2+).
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- paramagnetic manganese ione0
- Outcome
- irreversible trapping of Mn(2+) in the vacuolee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment of the tissue with paramagnetic manganese ion while perfusing in the presence of O(2) allowed for the observation of the sequence of events leading to the irreversible trapping of Mn(2+) in the vacuole.”
t0“Corn Root Tissue”
Claim · model-written summary
Magnesium pretreatment prevented manganese movement into the vacuole.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Mg(2+)e0
- Outcome
- Mn(2+) migration to the vacuolee0
- Direction
- preventede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pretreatment of the roots with Mg(2+) prevented Mn(2+) migration to the vacuole over the time period of this experiment.”
t0“Corn Root Tissue”
Claim · model-written summary
Hypoxia allowed only limited manganese uptake into root tip cytoplasm.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Hypoxiae0
- Outcome
- uptake of Mn(2+) into the cytoplasm of the root tipse0
- Direction
- prevented all but a limitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hypoxia prevented all but a limited uptake of Mn(2+) into the cytoplasm of the root tips.”
t0“Corn Root Tissue”
Claim · model-written summary
No Mn(2+) complexation with cytoplasmic or vacuolar Pi was observed.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- No evidence of Mn(2+) complexation of either cytoplasmic or vacuole Pie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No evidence of Mn(2+) complexation of either cytoplasmic or vacuole Pi suggests that the energy derived from O(2) consuming processes is necessary for the facilitated movement of this divalent cation.”
t0“Corn Root Tissue”
Claim · model-written summary
The authors suggest oxygen consuming energy is necessary for facilitated manganese movement.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- facilitated movement of this divalent catione0
- Qualifier
- energy derived from O(2) consuming processese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the energy derived from O(2) consuming processes is necessary for the facilitated movement of this divalent cation.”
t0“Corn Root Tissue”
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See all 9 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.