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Salt Tolerance in the Halophyte Suaeda maritima: Some Properties of Malate Dehydrogenase

journal contribution
posted on 2023-06-08, 11:31 authored by Tim Flowers, M E Ward, J L Hall
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.

History

Publication status

  • Published

Journal

Philosophical Transactions B: Biological Sciences

ISSN

0962-8436

Publisher

Royal Society, The

Issue

927

Volume

273

Page range

523-540

Department affiliated with

  • Evolution, Behaviour and Environment Publications

Notes

Times Cited: 24 Flowers, tj ward, me hall, jl

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-05-14

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