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Janicka-Russak M, Klobus G: Modification of plasma membrane and vacuolar H+ -ATPases in response to NaCL and ABA. J Plant Physiol. 2007 Mar;164(3):295-302. Epub 2006 Mar 20.
The role of ABA in the modification of membrane proton pump activity in cucumber roots which had been stressed for 24h with 200 mmol/dm (3) NaCl was investigated. It was shown that treatment of plants with salt distinctly increased the activity of the plasma membrane H (+)-ATPase (EC 3.6.3.6) as well as of the vacuolar H (+)-ATPase (EC 3.6.3.14). In roots treated with NaCl, an increase of ABA level was observed. Moreover, 24-h treatment of seedlings with 50 micro mol/dm (3) ABA increased the activity of proton pumps in both membranes. However, when ABA was added to the reaction medium, no changes in ATPase activities were observed. The increased H (+)-ATPase activity in plasma membranes isolated from the ABA-treated roots was positively correlated with a higher level of PM-H (+)-ATPase transcript. These data have provided evidence that under salt stress conditions, the role of ABA action due to salinity on the induction of the PM-H (+)-ATPase could be at the level of gene expression. |
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