Uptake of heavy metals by living and dead Cladonia thalli

Chettri, Mukesh Kumar; Sawidis, Thomas; Zachariadis, Georgios; Stratis, J. A.

doi:10.1016/s0098-8472(96)01023-4

Cited by 39 publications

(36 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5d). (Branquinho et al, 1997;Chettri et al, 1997), indicated that Cd, as well as Pb, Zn, and Cr(VI), also penetrates intracellularly in X. parietina thalli, both in the mycobiont and in the photobiont (the unicellular green alga Trebouxia spp. ).…”

Section: Intracellular CD Distribution and Effectsmentioning

confidence: 99%

“…Extracellular complexation of cationic HMs by fungal and algal cell walls has been imputed to electrostatic interactions with hydroxyl, carboxyl, phosphate, or sulfhydryl groups, and/or with organic acids, lichen acids, and oxalates (Branquinho, 2001;Sarret et al, 1998). Accordingly, cationic HMs other than Cd, namely Cu, Pb, and Zn, have been found to accumulate in the apoplast of both fungal and algal bionts (Chettri et al, 1997). Mechanisms of cell wall exclusion have also been noticed by us in previous experiments performed with X. parietina and other lichen species, exposed to HMs other than Cd, such as Pb, Zn, and Cr(VI) Sanità di Toppi et al, 2004).…”

Section: Intracellular CD Distribution and Effectsmentioning

confidence: 99%

“…Although the effects of certain HMs, such as Cu, Zn, Pb, or Mn, on lichen photosynthetic pigments have been extensively studied (Bačkor and Dzubaj, 2004;Branquinho et al, 1997;Chettri et al, 1997Chettri et al, , 1998Garty et al, 2001;Hauck et al, 2003), information concerning Cd effects are lacking. In the thalli of the lichens Cladonia convoluta and C. rangiformis exposed to Cu, Chettri et al (1998) observed a considerable decrease in Chla content; instead, total Chl (Chlaþb) content was less affected, since Chla was partly converted to Chlb by oxidation of the methyl group of ring II (Chettri et al, 1998).…”

Section: Intracellular CD Distribution and Effectsmentioning

confidence: 99%

See 2 more Smart Citations

Cadmium distribution and effects on ultrastructureand chlorophyll status in photobionts and mycobionts of Xanthoria parietina

Toppi

Musetti

Vattuone

et al. 2005

Microscopy Res & Technique

View full text Add to dashboard Cite

In this work, we tried to go deeper inside distribution and toxicity of cadmium (Cd) in the macrolichen Xanthoria parietina (L.) Th. Fr. Thalli of this species were treated with 0 (control), 4.5, 9, 18, or 36 muM Cd for 24 or 48 hours. Transmission electron microscopy, X-ray microanalysis, and electron energy loss spectroscopy were exploited to study distribution and ultrastructural effects of Cd in thalli; spectrophotometric techniques were utilized for measuring Cd effects on chlorophyll (Chl) content; light fluorescence microscopy was used to evaluate Chl autofluorescence. The highest Cd concentration caused ultrastructural alterations both in the mycobiont and in the photobiont, more severe in the latter, decreased total Chl content and progressively quenched Chl autofluorescence. Cell wall immobilization was observed in both bionts, and evidence pointing to a Cd-binding ability by the concentric bodies in the mycobiont was also obtained. Lower Cd concentrations led to slight or even no effects on thallus structures and on Chl content and autofluorescence. The results obtained suggest that: (1) among the two bionts, the algal partner appears to be more susceptible to Cd stress, probably because of the presence of delicate and sensitive components such as the chloroplast and photosynthetic pigments; (2) a concentration threshold exists for the occurrence of evident structural and functional damage in X. parietina thalli exposed to Cd.

show abstract

Section: Intracellular CD Distribution and Effectsmentioning

confidence: 99%

Section: Intracellular CD Distribution and Effectsmentioning

confidence: 99%

Section: Intracellular CD Distribution and Effectsmentioning

confidence: 99%

See 1 more Smart Citation

Cadmium distribution and effects on ultrastructureand chlorophyll status in photobionts and mycobionts of Xanthoria parietina

Toppi

Musetti

Vattuone

et al. 2005

Microscopy Res & Technique

View full text Add to dashboard Cite

show abstract

“…Chlorophyll content in C. convoluta increased with higher concentrations, whereas in C. rangiformis it decreased with the 10 −2 M concentration. The Pb uptake in C. rangiformis from singlemetal solutions after 10 −2 and 10 −4 M treatment of thalli was about 2.5 and 1.5 times, respectively, more than that in C. convoluta (Chettri et al, 1996). Higher K efflux was observed in C. convoluta than that in C. rangiformis, indicating that the plasma membrane of C. convoluta presents more effective barrier than that of C. rangiformis.…”

Section: Discussionmentioning

confidence: 88%

“…Comparing the uptake of Pb, Cu, and Zn in living and dead thalli of Cladonia in vitro, it was found that Zn can pass through the plasma membrane but Pb and Cu are obstructed by it (Chettri et al, 1996). High K + efflux was observed with Pb and Cu treatments, but less was observed with Zn.…”

Section: Discussionmentioning

confidence: 94%