Effects of Calcium and Lanthanum on ABA Biosynthesis in Cucumber Leaves

Effects of Calcium and Lanthanum on ABA Biosynthesis in Cucumber Leaves Cucumber (Cucumis sativus L.) leaves were treated with CaCl2 and LaCl3 at concentrations of 0.002, 0.02, 0.04, 0.2, 0.4, and 2.0 mM to study the effects of calcium and lanthanum on plants, especially on the pathway of abscisic acid biosynthesis. The activity of lipoxygenase (Lox) was measured, and the contents of violaxanthin (Vio, a precursor to ABA) and ABA were estimated. In addition, the soluble proteins in treated leaves were analyzed. The results suggest that La3+ influences Lox activity and the contents of Vio and ABA. Their changes are correlated to one another, thus indicating that ABA can be derived from a carotenoid in the presence of lanthanum. After leaf treatments with ions, the content of soluble proteins changed and a 41 kD polypeptide appeared confirming responsive gene expression. The effects of both ions on ABA and protein biosyntheses suggest that the appearance of this protein is not related to the endogenous ABA levels. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Effects of Calcium and Lanthanum on ABA Biosynthesis in Cucumber Leaves

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Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2002 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/A:1020257406100
Publisher site
See Article on Publisher Site

Abstract

Cucumber (Cucumis sativus L.) leaves were treated with CaCl2 and LaCl3 at concentrations of 0.002, 0.02, 0.04, 0.2, 0.4, and 2.0 mM to study the effects of calcium and lanthanum on plants, especially on the pathway of abscisic acid biosynthesis. The activity of lipoxygenase (Lox) was measured, and the contents of violaxanthin (Vio, a precursor to ABA) and ABA were estimated. In addition, the soluble proteins in treated leaves were analyzed. The results suggest that La3+ influences Lox activity and the contents of Vio and ABA. Their changes are correlated to one another, thus indicating that ABA can be derived from a carotenoid in the presence of lanthanum. After leaf treatments with ions, the content of soluble proteins changed and a 41 kD polypeptide appeared confirming responsive gene expression. The effects of both ions on ABA and protein biosyntheses suggest that the appearance of this protein is not related to the endogenous ABA levels.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 13, 2004

References

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