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© 1974 Oxford University Press

RESEARCH-ARTICLE

Some Physiological Responses of Chlorella pyrenoidosa to 2,4-Dichlorophenoxyacetic Acid

B. L. BERTAGNOLLI and M. J. NADAKAVUKAREN

University of Illinois, Department of Botany Urbana, Illinois, 61801, U.S.A.
Illinois State University, Department of Biological Sciences Normal, Illinois, 61761, U.S.A.

An 18-h treatment of synchronously-grown Chlorella pyrenoidosa with 2,4-D did not significantly alter the size, dry weight, degree of synchrony, or pigment content of the cells, nor were detectable quantities of ethylene produced. When Chlorella pyrenoidosa was treated with 5×10–4 M 2,4-D, there was a statistically significant stimulation of both net oxygen uptake and production while 5×10 M 2,4-D inhibited both processes. When Chlorella pyrenoidosa was treated with 5×10–4 M and 5×10–3 M 2,4-D, significantly greater amounts of glycollate were present in the culture medium, even though an assay for glycollate dehydrogenase showed that the activity of this enzyme from 2,4-D-treated Chlorella pyrenoidosa was three times greater than in control cells. Loosely bound 2,4-D was partitioned from a nonaqueously isolated chloroplast fraction, while other cell fractions failed to show detectable quantities of 2,4-D. It is postulated that in Chlorella pyrenoidosa the chloroplast is a target for 2,4-D action and that interference in photorespiratory processes may underlie the observed responses.


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