NDLI: Ultrastructure and subcellular distribution of Cr in Iris pseudacorus L. using TEM and X-ray microanalysis

Content Provider	Springer Nature Link
Author	Caldelas, Cristina Bort, Jordi Febrero, Anna
Copyright Year	2011
Abstract	Chromium pollution of freshwater is hazardous for humans and other organisms, and places a limitation on the use of polluted water sources. Phytoremediation, the use of plants to remove pollutants from the environment, is a cost-effective, environmentally friendly approach for water decontamination. To improve the efficiency of the process, it is essential to increase the current knowledge about Cr accumulation in macrophytes. Plants of Iris pseudacorus L. were treated with Cr(III) at 0.75 mM for 5 weeks to investigate Cr localization by means of transmission electron microscopy and energy dispersive X-ray analysis. Chromium induced severe ultrastructural alterations in the rhizodermis (cell wall disorganisation, thickening, plasmolysis, and electron-dense inclusions) and rhizome parenchyma (reduced cell size, cell wall detachment, vacuolation, and opaque granules). The highest Cr contents were found in the cell walls of the cortex in the roots and in the cytoplasm and intercellular spaces of the rhizome. The Cr concentration in root tissues was in the order cortex >rhizodermis >stele, whereas in the rhizome, Cr was evenly distributed. It is proposed that root and rhizome have distinct functions in the response of I. pseudacorus to Cr. The rhizodermis limits Cr uptake by means of Si deposition and cell wall thickening. The rhizome cortex generates vacuoles and granules where Cr co-occurs with S, indicating Cr sequestration by metal-binding proteins.
Starting Page	57
Ending Page	68
Page Count	12
File Format	PDF
ISSN	07422091
Journal	Cell Biology and Toxicology
Volume Number	28
Issue Number	1
e-ISSN	15736822
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-10-19
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Chromium Metal Rhizome Subcellular localization Ultrastructure X-ray microanalysis Biochemistry Pharmacology/Toxicology Cell Biology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Health, Toxicology and Mutagenesis Toxicology

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