TY  - JOUR
A1  - Sree, K. Sowjanya
A1  - Keresztes, Aron
A1  - Müller-Röber, Bernd
A1  - Brandt, Ronny
A1  - Eberius, Matthias
A1  - Fischer, Wolfgang
A1  - Appenroth, Klaus-J.
T1  - Phytotoxicity of cobalt ions on the duckweed Lemna minor - Morphology, ion uptake, and starch accumulation
JF  - Chemosphere : chemistry, biology and toxicology as related to environmental problems
N2  - Cobalt (Co2+) inhibits vegetative growth of Lemna minor gradually from 1 mu M to 100 mu M. Fronds accumulated up to 21 mg Co2+ g(-1) dry weight at 10 mu M external Co2+ indicating hyperaccumulation. Interestingly, accumulation of Co2+ did not decrease the iron (Fe) content in fronds, highlighting L. minor as a suitable system for studying effects of Co2+ undisturbed by Fe deficiency symptoms unlike most other plants. Digital image analysis revealed the size distribution of fronds after Co2+ treatment and also a reduction in pigmentation of newly formed daughter fronds unlike the mother fronds during the 7-day treatment. Neither chlorophyll nor photosystem II fluorescence changed significantly during the initial 4 d, indicating effective photosynthesis. During the later phase of the 7-day treatment, however, chlorophyll content and photosynthetic efficiency decreased in the Co2+-treated daughter fronds, indicating that Co2+ inhibits the biosynthesis of chlorophyll rather than leading to the destruction of pre-existing pigment molecules. In addition, during the first 4 d of Co2+ treatment starch accumulated in the fronds and led to the transition of chloroplasts to chloro-amyloplasts and amylo-chloroplasts, while starch levels strongly decreased thereafter. (C) 2015 Elsevier Ltd. All rights reserved.
KW  - Chloroplast
KW  - Cobalt
KW  - Lemnaceae
KW  - Lemna minor
KW  - Phytotoxicity
KW  - Starch accumulation
Y1  - 2015
U6  - https://doi.org/10.1016/j.chemosphere.2015.03.008
SN  - 0045-6535
SN  - 1879-1298
VL  - 131
SP  - 149
EP  - 156
PB  - Elsevier
CY  - Oxford
ER  -