2001
DOI: 10.1007/s002840010307
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Reduced Uptake as a Mechanism of Zinc Tolerance in Oscillatoria anguistissima

Abstract: Oscillatoria anguistissima could tolerate 50 ppm ZnSO4 x 7H2O, and a zinc-tolerant strain with maximum tolerance concentration (MTC) of 100 ppm ZnSO4 x 7H2O was obtained by stepwise transfer to higher concentrations. The adaptation was irreversible even after three generations in metal-free medium. In the presence of metal, the tolerant strain grew with a shorter lag period of 4 days as against 6 days in the case of the wild strain. The tolerant strain had higher MTC than that of the wild strain for other meta… Show more

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Cited by 13 publications
(8 citation statements)
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“…The maximum values of total Zn removed by 7 days (as obtained in this study) were higher than those reported by Ahuja et al (2001) encompassing Zn removal by (the related cyanobacterium) O. anguistissima-i.e. 35.7 and 83.4 mg Zn/g D.W., after 10 days of growth under 20 and 30 mg Zn/l, respectively; or by Pawlik-Skowrońska (2003) for (the related green microalga) Stigeoclonium tenuei.e.…”
Section: Discussioncontrasting
confidence: 80%
See 1 more Smart Citation
“…The maximum values of total Zn removed by 7 days (as obtained in this study) were higher than those reported by Ahuja et al (2001) encompassing Zn removal by (the related cyanobacterium) O. anguistissima-i.e. 35.7 and 83.4 mg Zn/g D.W., after 10 days of growth under 20 and 30 mg Zn/l, respectively; or by Pawlik-Skowrońska (2003) for (the related green microalga) Stigeoclonium tenuei.e.…”
Section: Discussioncontrasting
confidence: 80%
“…accumulated intracellularly the highest proportion of Zn removed from the medium, in the range 0.1-2 mg/l; Yan and Pan (2002) reported, in turn, that Closterium lunula cells did not undergo damage in the presence of 50 lg Cu/l, owing to their ability to exclude this metal. Additionally, Ahuja et al (2001) claimed that the enhanced tolerance of Oscillatoria anguistissima to Zn is a consequence of a reduced intracellular uptake. This latter case is the most similar to our evidence encompassing the two strains (as shown in Fig.…”
Section: Discussionmentioning
confidence: 98%
“…Localization of Cu 2? was studied using a transmission electron microscope (JEM-1230) according to the procedure describe by Ahuja et al (2001). Scale bars 0.5 lm precipitation.…”
Section: Copper Accumulation Properties Of Strain At01mentioning
confidence: 99%
“…for Scenedesmus subspicatus (exposed to 0.5 mg l -1 zinc for 4 days), Ahuja et al (2001) also reported higher zinc removal ability for the cyanobacterium Oscillatoria ) in zinc-treated M. pusillum and M. griffithii cultures, on day 0, 3, and 7 of cultivation. Mean values (n = 3) and standard deviations are plotted, and different lowercase letters indicate significant differences (P \ 0.05) angustissima (35.7 and 83.4 mg g -1 ; exposed to 20 and 30 mg l -1 zinc, respectively for after 10 days).…”
Section: Removal Of Zincmentioning
confidence: 99%