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Effects of manganese on the microstructures of Chenopodium ambrosioides L., A manganese tolerant plant

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Chenopodium ambrosioides L. can tolerate high concentrations of manganese and has potential for its use in the revegetation of manganese mine tailings. Following a hydroponic investigation, transmission electron microscopy (TEM)-energy disperse spectroscopy (EDS) was used to study microstructure changes and the possible accumulation of Mn in leaf cells of C. ambrosioides in different Mn treatments (200, 1000, 10000 μmol·L−1). At 200 μmol·L−1, the ultrastructure of C. ambrosioides was clearly visible without any obvious damage. At 1000 μmol·L−1, the root, stem and leaf cells remained intact, and the organelles were clearly visible without any obvious damage. However, when the Mn concentration exceeded 1000 μmol·L−1 the number of mitochondria in root cells decreased and the chloroplasts in stem cells showed a decrease in grana lamellae and osmiophilic granules. Compared to controls, treatment with 1000 μmol·L−1 or 10000 μmol·L−1 Mn over 30 days, gave rise to black agglomerations in the cells. At 10000 μmol·L−1, Mn was observed to form acicular structures in leaf cells and intercellular spaces, which may be a form of tolerance and accumulation of Mn in C. ambrosioides. This study has furthered the understanding of Mn tolerance mechanisms in plants, and is potential for the revegetation of Mn-polluted soils.
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Keywords: Chenopodium ambrosioides L; manganese; tolerance; ultrastructure

Document Type: Research Article

Affiliations: 1: School of Metallurgy and Environment, Central South University, Changsha, PR China 2: Crop and Environment Sciences Department, Harper Adams University, Newport, Shropshire, United Kingdom 3: College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, PR China

Publication date: July 2, 2016

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