Abstract
Plasma membrane (PM) H(+)-ATPase and H(+) transport activity were detected in PM fractions prepared from Zostera marina (a seagrass), Vallisneria gigantea (a freshwater grass) and Oryza sativa (rice, a terrestrial plant). The properties of Z. marina PM H(+)-ATPase, specifically, the optimal pH for ATPase activity and the result of trypsin treatment, were similar to those of authentic PM H(+)-ATPases in higher plants. In V. gigantea and O. sativa PM fractions, vanadate-sensitive (P-type) ATPase activities were inhibited by the addition of NaCl. In contrast, activity in the Z. marina PM fraction was not inhibited. The nitrate-sensitive (V-type) and azide-sensitive (F-type) ATPase activities in the Z. marina crude microsomal fraction and the cytoplasmic phosphoenolpyruvate carboxylase activity, however, were inhibited by NaCl, indicating that not all enzyme activities in Z. marina are insensitive to salt. Although the ratio of Na(+) to K(+) (Na(+)/K(+)) in seawater is about 30, Na(+)/K(+) in the Z. marina cells was about 1.0. The salt-tolerant ATPase activity in the plasma membrane must play an important role in maintaining a low Na(+) concentration in the seagrass cells.
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Claims 8
Claim · model-written summary
The optimal pH and trypsin response of the Z. marina plasma membrane H+-ATPase are similar to those of authentic plasma membrane H+-ATPases of higher plants.
- Taxon
- Z. marina
Zostera marinae1 - Gene
- PM H(+)-ATPasee1
- Outcome
- optimal pH for ATPase activitye1
- Direction
- similare1
- Comparator
- authentic PM H(+)-ATPases in higher plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The properties of Z. marina PM H(+)-ATPase, specifically, the optimal pH for ATPase activity and the result of trypsin treatment, were similar to those of authentic PM H(+)-ATPases in higher plants.”
Claim · model-written summary
In Vallisneria gigantea plasma membrane fractions, NaCl inhibits the vanadate-sensitive P-type ATPase activities.
- Taxon
- V. gigantea
Vallisneria giganteae1 - Treatment
- addition of NaCle1
- Outcome
- vanadate-sensitive (P-type) ATPase activitiese1
- Direction
- inhibitede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In V. gigantea and O. sativa PM fractions, vanadate-sensitive (P-type) ATPase activities were inhibited by the addition of NaCl.”
Claim · model-written summary
In rice plasma membrane fractions, NaCl inhibits the vanadate-sensitive P-type ATPase activities.
- Taxon
- O. sativa
Oryza sativae1 - Treatment
- addition of NaCle1
- Outcome
- vanadate-sensitive (P-type) ATPase activitiese1
- Direction
- inhibitede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In V. gigantea and O. sativa PM fractions, vanadate-sensitive (P-type) ATPase activities were inhibited by the addition of NaCl.”
Claim · model-written summary
NaCl does not inhibit the activity in the Z. marina plasma membrane fraction.
- Taxon
- Z. marinaZostera marinae1
- Treatment
- NaCle2
- Outcome
- activity in the Z. marina PM fractione1
- Direction
- not inhibitede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In contrast, activity in the Z. marina PM fraction was not inhibited.”
e2“In V. gigantea and O. sativa PM fractions, vanadate-sensitive (P-type) ATPase activities were inhibited by the addition of NaCl.”
Claim · model-written summary
NaCl inhibits the nitrate-sensitive (V-type) and azide-sensitive (F-type) ATPase activities of the Z. marina crude microsomal fraction.
- Taxon
- Z. marinaZostera marinae1
- Organ / stage
- crude microsomal fractione1
- Treatment
- NaCle1
- Outcome
- nitrate-sensitive (V-type) and azide-sensitive (F-type) ATPase activitiese1
- Direction
- inhibitede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The nitrate-sensitive (V-type) and azide-sensitive (F-type) ATPase activities in the Z. marina crude microsomal fraction and the cytoplasmic phosphoenolpyruvate carboxylase activity, however, were inhibited by NaCl”
Claim · model-written summary
NaCl inhibits the cytoplasmic phosphoenolpyruvate carboxylase activity in Z. marina.
- Taxon
- Z. marinaZostera marinae1
- Treatment
- NaCle1
- Outcome
- cytoplasmic phosphoenolpyruvate carboxylase activitye1
- Direction
- inhibitede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The nitrate-sensitive (V-type) and azide-sensitive (F-type) ATPase activities in the Z. marina crude microsomal fraction and the cytoplasmic phosphoenolpyruvate carboxylase activity, however, were inhibited by NaCl”
Claim · model-written summary
The Na(+)/K(+) ratio in Z. marina cells is about 1.0, while the ratio in seawater is about 30.
- Taxon
- Z. marinaZostera marinae1
- Outcome
- Na(+)/K(+)e1
- Value
- about 1.0e1
- Qualifier
- about 30e1
- Comparator
- seawatere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Although the ratio of Na(+) to K(+) (Na(+)/K(+)) in seawater is about 30, Na(+)/K(+) in the Z. marina cells was about 1.0.”
Claim · model-written summary
The salt-tolerant plasma membrane ATPase activity is likely to play an important role in keeping Na(+) low in Z. marina cells.
- Taxon
- Z. marinaZostera marinae2
- Gene
- salt-tolerant ATPasee1
- Outcome
- maintaining a low Na(+) concentratione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The salt-tolerant ATPase activity in the plasma membrane must play an important role in maintaining a low Na(+) concentration in the seagrass cells.”
e2“Although the ratio of Na(+) to K(+) (Na(+)/K(+)) in seawater is about 30, Na(+)/K(+) in the Z. marina cells was about 1.0.”
The same questions in other papers
sodium chloride · physiology: enzyme activity · Oryza sativa (rice)Results differ
3 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
4 papers more in this group
See all 8 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.