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.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 13, 2004
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