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Document Type

Research

Abstract

Assuming optical density to be a function of population density, colorimetric techniques were used to determine the effects of two growth regulator substances, indole-3-acetic acid and gibberellic acid, on the morphology and population dynamics of Eudorina elegans. A tube of culture medium without organisms was used as a reference point to calibrate the colorimeter. Chemically-treated cultures and soil-water control cultures were compared to the reference reading and growth curves were plotted. Colony counts were made at the termination of the experiment and comparisons were made with the colorimeter readings. Results demonstrated gibberellic acid to be a promoter of cell division and/or growth in concentrations below 75 ppm and to be inhibitory at concentrations of 75 ppm and above. Indole-3-acetic acid produced little effect on populations at low concentrations and was strongly inhibitory above concentrations of 5 ppm.

Publication Date

1967

Journal Title

Proceedings of the Iowa Academy of Science

Volume

74

Issue

1

First Page

36

Last Page

44

Copyright

© Copyright 1967 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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