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Effects of Glyphosate on the Growth Rate of Chlorella

S. L. Christy, E. P. Karlander and J. V. Parochetti
Weed Science
Vol. 29, No. 1 (Jan., 1981), pp. 5-7
Stable URL: http://www.jstor.org/stable/4043399
Page Count: 3
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of Glyphosate on the Growth Rate of Chlorella
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Abstract

The unicellular green alga, Chlorella sorokiniana Shihira and Krauss, was cultured in vitro using an inorganic growth medium with various concentrations of the herbicide glyphosate [N-(phosphonomethyl)glycine]. Growth rates, in terms of cell doublings per day, were determined for cells inoculated into media containing from 5.91 × 10⁻⁶ M to 591 × 10⁻⁶M glyphosate. Comparisons with a control, which supported 10.4 doublings/day, showed growth only slightly reduced at 5.91 × 10⁻⁶M and 11.8 × 10⁻⁶M, with averages of 9.7 and 9.5 doublings/day; reduced by more than half at 17.7 × 10⁻⁶M with an average of 4.4 doublings/day; and prevented at all higher concentrations. In addition to completely preventing growth at 23.7 × 10⁻⁶M and above, glyphosate seemed to cause a deterioration of the inoculum cells. Filtering the media containing 5.91 × 10⁻⁶M, 11.8 × 10⁻⁶M, and 17.7 × 10⁻⁶M through kaolinite prior to introduction of the alga reduced the inhibition previously noted at 17.7 × 10⁻⁶M and resulted in growth rates from 9.1 to 9.5 doublings/day.

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