Home > Iowa Academy of Science > Journals & Newsletters > Proceedings of the Iowa Academy of Science > Volume 47 (1940) > Annual Issue
Document Type
Research
Abstract
About 20 years ago, Bottomley (3), at the University of London, failed to secure normal growth of Lemna and other plants in inorganic salt solutions without the addition of organic matter. He concluded that special compounds, similar to vitamins for animals, were required by plants. These unknown substances were termed auximones. Mockeridge (20, 21) using solutions identical with those employed by Bottomley, found that a decided stimulation of the rate of reproduction of Lemna was produced by various nucleic acid derivatives isolated from soil and manure. Azotobacter and yeast were also found to contain accessories for plant growth, and the possible manufacture of auximones by bacteria was suggested. Opposed to Bottomley and Mockeridge were investigators who denied the essential nature of the auximones while admitting the stimulation factor.
Publication Date
1940
Journal Title
Proceedings of the Iowa Academy of Science
Volume
47
Issue
1
First Page
239
Last Page
247
Copyright
©1940 Iowa Academy of Science, Inc.
Language
en
File Format
application/pdf
Recommended Citation
Clark, Norman Ashwell and Frahm, Elmer E.
(1940)
"The Effect of Various Growth-Promoting Substances on the Reproduction of Lemna,"
Proceedings of the Iowa Academy of Science, 47(1), 239-247.
Available at:
https://scholarworks.uni.edu/pias/vol47/iss1/46