Cytotoxic effects of hexavalent chromium inEuglena gracilis. II. Physiological and ultrastructural studies

Fasulo, M. P.; Bassi, Maria; Donini, A.

doi:10.1007/bf01279866

Cited by 49 publications

(21 citation statements)

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“…Reduction in plant growth due to Cr exposure induced a lower respiration rate than what was reported earlier (Bassi et al 1990). The decrease in the respiration rate might be related to the mitochondrial damage caused by the Cr exposure (Fasulo et al 1983). Kudzu grown at 12 mg L -1 Cr clearly showed symptoms of toxicity.…”

Section: Discussionmentioning

confidence: 99%

Selected physiological responses of kudzu to different chromium concentrations

Connell

Al-Hamdani²

2001

Can. J. Plant Sci.

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Connell, S. L. and Al-Hamdani, S. H. 2001. Selected physiological responses of kudzu to different chromium concentrations. Can. J. Plant Sci. 81: 53-58. This study was designed to evaluate the potential use of kudzu (Pueraria montana var. lobata) as a phytoremediator to reduce Cr (VI) contamination. In addition, the effect of Cr concentrations of 4, 8, and 12 mg L -1 on kudzu growth, gas exchange, pigment concentration, and carbohydrate accumulation were evaluated. In general, Cr uptake by kudzu was increased as Cr concentration increased in the growing media. Most of the Cr taken up by kudzu was accumulated in the root as indicated by the significantly higher ratio of root/shoot Cr concentrations at increasing Cr levels in the root environment. Kudzu growth, photosynthetic rate, and chlorophyll a and b concentrations declined as the Cr concentration increased. The decrease in photosynthesis was independent of the internal carbon dioxide. Anthocyanin was found to increase as Cr concentration gradually increased from 4 to 12 mg L -1 . Kudzu clearly demonstrated its ability to survive at Cr concentrations up to 8 mg L -1 in the root environment. Kudzu, therefore, can be considered as a replacement crop in areas of Cr contamination falling within the concentration range of this study.

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Section: Discussionmentioning

confidence: 99%

Selected physiological responses of kudzu to different chromium concentrations

Connell

Al-Hamdani²

2001

Can. J. Plant Sci.

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“…Embedding and staining procedures for transmission electron microscopy (TEM) were routinely performed as described in previous reports (Fasulo et al, 1983;Pancaldi et al, 2002). Samples were observed with a Hitachi H800 electron microscope (Electron Microscopy Centre, Ferrara University, Italy).…”

Section: Transmission Electron Microscopymentioning

confidence: 99%

Acclimation to darkness in the marine chlorophyteKoliella antarcticacultured under low salinity: hypotheses on its origin in the polar environment

Ferroni

Baldisserotto

Zennaro

et al. 2007

European Journal of Phycology

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2007) Acclimation to darkness in the marine chlorophyte Koliella antarctica cultured under low salinity: hypotheses on its origin in the polar environment, European Journal of Phycology, 42:1, 91-104, In order to obtain new insights on the origin and physiology of the marine chlorophyte Koliella antarctica, the response of the microalga was studied at a salinity of 0.2 in the light and during a 60-day dark period. In light conditions, the alga grows and maintains a functional cell organization. In darkness, the chloroplast-to-chromoplast transition, previously described during dark-acclimation in K. antarctica under a salinity of 34 was only partially triggered; thylakoid lamellae became re-organized into short bundles, but storage substructures were almost completely missing. Microspectrofluorometry, pigment analyses, and morphological observations revealed dark-induced degradation of photosystem II (PSII) with relative stability in the lightharvesting complex (LHCII). Chromatin condensation, mitochondrion fragmentation and material digestion in vacuoles were similar to morphological hallmarks of programmed cell death (PCD), but only 30% of cells underwent cell death and, at the end of the experiment, only 1-2% of cells were TUNEL-positive. Rapid recovery in culture growth after exposure to light showed that the changes apparent in the rest of cells were reversible. Taking into account the response of the plastid and assuming an adaptive benefit of PCD, our results are consistent with the hypothesis that K. antarctica evolved from an Antarctic freshwater ancestor.

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“…In this study, adverse effects of heavy metals were examined. Cytotoxic effects (Fasulo et al, 1982), ultrastructure (Fasulo et al, 1983) Ni Physiological changes (Ahmed and Häder, 2010b) Cu Cell proliferation and ultrastructure (Einicker-Lamas et al, 2002) Zn Physiological changes (de Filippis et al, 1981;de Filippis and Ziegler, 1993) Ag Effect of silver nanoparticles on cell morphology and photosynthesis (Li et al, 2015), effect of AgNO3 on motility (Häder et al, 1997) Cd Effects on ultrastructure (Duret et al, 1986), physiological changes (Ahmadinejad et al, 2007;Koumura et al, 2004;Navarro et al, 1997), cell damage (Watanabe and Suzuki, 2002) Hg Physiological changes (Ahmadinejad et al, 2007;Koumura et al, 2004;Navarro et al, 1997) Pb Physiological changes (Ahmadinejad et al, 2007;Koumura et al, 2004;Navarro et al, 1997) Mn Ultrastructure, physiology (Ferroni et al, 2004b) (Naumann et al, 2007) …”

Section: Acknowledgementsmentioning

confidence: 98%