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Distribution of rare earth elements among chloroplast components of hyperaccumulator Dicranopteris dichotoma

Distribution of rare earth elements among chloroplast components of hyperaccumulator Dicranopteris dichotoma

Analytical and Bioanalytical Chemistry 376(6): 913-917

ISSN/ISBN: 1618-2642

PMID: 12827335

DOI: 10.1007/s00216-003-2014-y

A rare earth element (REE) hyperaccumulator, Dicranopteris dichotoma, that accumulates more than 0.1% REEs dry leaf mass has been discovered in southern China. The different components of chloroplast were isolated and the concentration of REEs in each component was determined by ICP-MS. The experimental data indicated that about 8% of total leaf REEs was present in the chloroplast of Dicranopteris dichotoma. In order to thoroughly study the distribution of REEs among different components of chloroplast, the membrane of chloroplast, the intact thylakoid and the photosystem II (PS II system) of D. dichotoma were isolated from the chloroplast. It was found that half of total chloroplast REEs was stored at the membrane of the chloroplast and another half was in the thylakoid. And 25% of total chloroplast REEs was bound with PS II system of D.dichotoma. The concentration of REEs in chlorophyll a was only at the level of microg/g on the bases of chlorophylls. These data are useful for understanding of both the storage of REEs in chloroplast and the effect of REEs on the photosynthesis of plants.

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Accession: 003716705

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