@article{SreeKeresztesMuellerRoeberetal.2015,
  author    = {Sree, K. Sowjanya and Keresztes, Aron and M{\"u}ller-R{\"o}ber, Bernd and Brandt, Ronny and Eberius, Matthias and Fischer, Wolfgang and Appenroth, Klaus-J.},
  title     = {Phytotoxicity of cobalt ions on the duckweed Lemna minor - Morphology, ion uptake, and starch accumulation},
  series = {Chemosphere : chemistry, biology and toxicology as related to environmental problems},
  volume    = {131},
  journal   = {Chemosphere : chemistry, biology and toxicology as related to environmental problems},
  publisher = {Elsevier},
  address   = {Oxford},
  issn      = {0045-6535},
  doi       = {10.1016/j.chemosphere.2015.03.008},
  pages     = {149 -- 156},
  year      = {2015},
  abstract  = {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.},
  language  = {en}
}