The Comparative Study on the Relationship between the Activity of IAA Oxidase and the Rooting of Cuttings of Eucalyptus and Other Species

The relationship between the activities of indole acetic acid (IAA) oxidase and the rooting of cuttings of four Eucalyptus species and Euphorbia pulcherrima, Ligustrum sinense, Carmona microphylla was investigated.It indicated that the activities of IAA oxidase in difficult to root species Eucalyptus were higher than that in easy-to-root species E. pulcherrima, L. sinense and C. microphylla. The activities of IAA oxidase in different parts of the same twigs of every species were quite different. The enzyme activity of the top parts of the twigs was the lowest.The further the parts of the twigs departing from the top, the higher the enzyme activities. The enzyme activities were different in each season and each species. Each species had its own regular pattern. The enzyme activities in the cuttings of each species tended to be higher after inserting.