Journal
JOURNAL OF PLANT PHYSIOLOGY
Volume 170, Issue 18, Pages 1553-1560Publisher
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2013.06.009
Keywords
alpha-Glucan; Cadmium; Copper; Detoxification; Iron
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Funding
- Japan Society for the Promotion of Science [21380049]
- Grants-in-Aid for Scientific Research [21380049] Funding Source: KAKEN
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Common reed (Phragtnites australis) is a phytoremediator tolerant to heavy metals. In this study, we found that 70% of the cadmium (Cd) found in the stem of common reed exists in a soluble form, with more than half of the soluble Cd in the 10- to 50-kDa fraction. Based on an enzyme degradation assay, the major component of the Cd-associated molecule -is assumed to be an amylopectin-like a-glucan. This molecule may associate with Cd via the carboxyl group, rather than the thiol group. The conditions required for the disengagement of Cd from the 10- to 50-kDa fraction indicated that disulfide bonds and other intramolecular interactions may contribute to maintaining the proper conformation of the molecule and to stabilizing its association with Cd. Accumulation of the Cd-associated molecule was induced by Cd stress, and the molecule was found to be also associated with Cu and Fe. Thus, we have identified a novel mechanism of Cd-pooling, namely, the association of Cd with an alpha-glucan-like molecule in reed stem. (C) 2013 Elsevier GmbH. All rights reserved.
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