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Effects of Glyphosate on the Growth Rate of Chlorella

Published online by Cambridge University Press:  12 June 2017

S. L. Christy ,
E. P. Karlander  and
J. V. Parochetti
S. L. Christy
Affiliation:
Dep. Bot., Univ. Maryland, College Park, MD 20742
E. P. Karlander
Affiliation:
Faculty Oriented Programs, N.S.F., Wash., D.C. 20006, leave of absence from Bot. Dep., Univ. of Maryland, College Park, MD 20742
J. V. Parochetti
Affiliation:
Pesticides, Applicator Training & Weed Sci., Sci. Ed. Adm., Ext., U.S. Dep. Agric., Wash., D.C. 20250
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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 ceil 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.

Keywords

Soil inactivationnon-target organisms
Type
Research Article
Information
Weed Science , Volume 29 , Issue 1 , January 1981 , pp. 5 - 7
Copyright
Copyright © 1981 by the Weed Science Society of America 

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References

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