Abstract
Abstract Malate dehydrogenase activity in a high speed supernatant fraction prepared from homogenates of the shoots of the halophyte Suaeda maritima was separated into two fractions by gel filtration. Sodium chloride stimulated the activity of the larger molecular mass form of the enzyme to a greater extent than that of the smaller molecular mass form : the latter constituted the bulk of the activity. The degree of stimulation by sodium chloride increased with increasing substrate concentrations. Differences between the properties of the enzymes isolated from plants grown with and without sodium chloride are described. The results obtained with the halophyte enzyme were very similar to those obtained with the glycophyte Pisum sativum. Maximum activation of enzyme activity was obtained with a salt concentration of 50 mol m-3 in both species and at higher concentrations activity was inhibited. The results are discussed in relation to the mechanism of salt tolerance in halophytes.
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Claims 9
Claim · model-written summary
Suaeda maritima shoot malate dehydrogenase activity separated into two fractions.
- Taxon
- Suaeda maritima
Suaeda maritimae0 - Organ / stage
- shootse0
- Gene
- Malate dehydrogenasee0
- Outcome
- separated into two fractionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Malate dehydrogenase activity in a high speed supernatant fraction prepared from homogenates of the shoots of the halophyte Suaeda maritima was separated into two fractions by gel filtration.”
Claim · model-written summary
Sodium chloride stimulated the larger enzyme form more than the smaller form.
- Taxon
- Suaeda maritimaSuaeda maritimat0
- Treatment
- Sodium chloridee0
- Outcome
- activity of the larger molecular mass form of the enzymee0
- Direction
- stimulatede0
- Comparator
- smaller molecular mass forme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sodium chloride stimulated the activity of the larger molecular mass form of the enzyme to a greater extent than that of the smaller molecular mass form”
t0“Suaeda maritima”
Claim · model-written summary
The smaller molecular mass form accounted for most enzyme activity.
- Taxon
- Suaeda maritimaSuaeda maritimat0
- Material
- smaller molecular mass forme1
- Outcome
- bulk of the activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the latter constituted the bulk of the activity”
e1“smaller molecular mass form”
t0“Suaeda maritima”
Claim · model-written summary
Salt stimulation increased with substrate concentration.
- Taxon
- Suaeda maritimaSuaeda maritimat0
- Compound
- substratee0
- Outcome
- degree of stimulation by sodium chloridee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The degree of stimulation by sodium chloride increased with increasing substrate concentrations.”
t0“Suaeda maritima”
Claim · model-written summary
Halophyte and Pisum sativum enzyme results were very similar.
- Taxon
- Suaeda maritimaSuaeda maritimat0
- Outcome
- very similare0
- Comparator
- Pisum sativume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results obtained with the halophyte enzyme were very similar to those obtained with the glycophyte Pisum sativum.”
t0“Suaeda maritima”
Claim · model-written summary
Suaeda maritima enzyme activation peaked at a salt concentration of 50 mol m-3.
- Taxon
- Suaeda maritimaSuaeda maritimat0
- Treatment
- salt concentration of 50 mol m-3e0
- Outcome
- enzyme activitye0
- Direction
- Maximume0
- Value
- 50 mol m-3e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum activation of enzyme activity was obtained with a salt concentration of 50 mol m-3 in both species”
t0“Suaeda maritima”
Claim · model-written summary
Pisum sativum enzyme activation peaked at a salt concentration of 50 mol m-3.
- Taxon
- Pisum sativum
Lathyrus oleraceuse1 - Treatment
- salt concentration of 50 mol m-3e0
- Outcome
- enzyme activitye0
- Direction
- Maximume0
- Value
- 50 mol m-3e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum activation of enzyme activity was obtained with a salt concentration of 50 mol m-3 in both species”
e1“Pisum sativum”
Claim · model-written summary
Higher salt concentrations inhibited Suaeda maritima enzyme activity.
- Taxon
- Suaeda maritimaSuaeda maritimat0
- Treatment
- higher concentrationse0
- Outcome
- activitye0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at higher concentrations activity was inhibited”
t0“Suaeda maritima”
Claim · model-written summary
Higher salt concentrations inhibited Pisum sativum enzyme activity.
- Taxon
- Pisum sativumLathyrus oleraceuse1
- Treatment
- higher concentrationse0
- Outcome
- activitye0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at higher concentrations activity was inhibited”
e1“Pisum sativum”
The same questions in other papers
sodium chloride · physiology: enzyme activity · Suaeda maritimaPositive and negative results
2 in the opposite direction
- no effect
- no effect
salinity · soil: biology · Lathyrus oleraceus (pea)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.