title: IAA-oxidase activity in light grown cucumber hypocotyls treated with helminthosporol.
abstract: Helminthosporol (H-ol) promoted the growth of light grown cucumber hypocotyls. The IAA-oxidase activity per dry weight of the hypocotyl of H-ol treated materials was less than that of controls. There was an inverse relationship between IAA-oxidase activity and H-ol induced elongation of the hypocotyl. However, when IAA-oxidase activity per plant was compared between H-ol treated materials and controls there was no essential difference. It is concluded that the apparent inhibitory effect of H-ol on IAA-oxidase activity is not directly related to the mechanism of H-ol action.
authors.affiliation: Biology Department, International Christian University, Mitaka, Tokyo.
authors.forename: M
authors.initials: M
authors.lastname: Katsumi
authors.forename: S
authors.initials: S
authors.lastname: Tamura
authors.forename: A
authors.initials: A
authors.lastname: Sakurai