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Copper requirement of a copper tolerant isolate of scenedesmus and the effect of copper depletion on tolerance



Copper requirement of a copper tolerant isolate of scenedesmus and the effect of copper depletion on tolerance



Canadian Journal of Botany 59(10): 1817-1823



A Cu-tolerant isolate of Scenedesmus from Sudbury, Ontario [Canada], cultured in medium completely lacking Cu, lost its ability to grow at high Cu concentrations after 10 generations. The change was sudden in onset and relatively rapid. The algae had previously been maintained on medium with micronutrient levels of Cu and had retained their tolerance over 7 yr of laboratory culture. The tolerance of the Cu depleted cells to Ni and Co also decreased. Their tolerance to Cd and Ag was unchanged by Cu depletion. The situation for Zn tolerance was less clear, but there was no significant decrease over the range tested. When Cu-depleted cells were cultured in complete medium with micronutrient levels of Cu, Cu tolerance increased after 4 divisions and recovered to the original state after 8 divisions. Plate assays indicated that all of the cells in the culture were recovering, i.e., this was not a reselection of a few tolerant cells. The results are discussed in terms of possible tolerance mechanisms, and their implications for the occurrence of multiple or cotolerance.

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Accession: 005055563

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DOI: 10.1139/b81-242


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