Studies on branching habits in crop plants: VII. On auxin concentration, indoleacetic acid oxidase activity and comparative amount of its inhibitor in stem tissue in ralation to the tillering character in two varieties of corn

Abstract

Relation of auxin concentration, IAA oxidase activity and comparative amount of IAA oxidase inhibitor in stem tissue to the tillering ability of corn was studied by using two varieties of corn, GC as a good-tillering variety and WD as a poor-tillering one. The stem from light-grown corn seedlings at leaf age 5 was divided into 3 parts and used for experiment. As the results of experiment, it was demonstrated that GC contained lower amount of auxin, of which IAA was the majority, higher IAA oxidase activity and less IAA oxidase inhibitor in stem tissue than those of WD. These observations suggest the responsibility of IAA oxidase and its inhibitor for varietal difference in auxin concentration, and in its turn for varietal difference in tillering ability. © 1969, CROP SCIENCE SOCIETY OF JAPAN. All rights reserved.