EFFECT OF YEAST SEXUAL HORMONES ON ELONGATION OF AVENA COLEOPTILE |
| |
| Authors: | YOSHIO MASUDA CHIKASHI SHIMODA NARAO TAKAO NAOHIKO YANAGISHIMA |
| |
| Institution: | Department of Biology, Faculty of Science, Osaka City University. Sumiyoshi-ku, Osaka 558;Kobe Women's College of Pharmacy, Higashinada-ku, Kobe 658, Japan |
| |
| Abstract: | Effect of yeast (Saccharomyces cerevisiae) sexual hormones on the elongation of etiolated Avena coleoptile segments was studied. The elongation was promoted by a hormone excreted by cells of mating type a, but not by α hormone excreted by cells of α type. The effect of the former was as great as that of 5 mg/1 indole-3-acetic acid in the first hour of application. The optimal concentration of a hormone was 10 units/ml. Its growth promoting effect was greatly inhibited by an antiauxin, 2,4,6-trichlorophenoxyacetic acid. a Hormone increased cell wall extensibility just as auxin does. Testosterone, β-estradiol, progesterone and ergosterol showed very little effect on the elongation of coleoptile segments. |
| |
| Keywords: | |
|
|
