Effects of indoleacetic, p-chlorophenoxyisobutyric and 2,4,6-trichlorophenoxyacetic acids on three phases of rooting in Azukia cuttings

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In adventitious root formation of disbudded epicotyl cuttings taken from light-grown, 5-day-old Azukia angularis seedlings, indoleacetic acid (IAA), 1 × 10^<-4> M, applied during the first day showed no effect, but enhanced the effect of IAA, 1 × 10<-4> M, applied during the second day. Treatment during the second day promoted rooting by about 70%, and a combination of treatments for the first and second days promoted rooting some 200%. p-Chlorophenoxyisobutyric acid (PCIB), 3 × 10<-4> M, and 2,4,6-trichlorophenoxy-acetic acid (2,4,6-T), 2 × 10<-4> M, applied the first day also enhanced the effect of IAA, 2 × 10<-4> M, applied the second day. When applied the second day, PCIB, 2 × 10<-4> M, increased the number of root primordia or clusters of small cells, but not the number of protruded roots. Formation of the cell cluster was inhibited by 2,4,6-T, 3 × 10<-4> M, applied the second day. Rooting processes in Azukia cuttings seem to include at least three phases : the first phase is induced not only by IAA but also by PCIB or 2,4,6-T, the second phase is induced by IAA or PCIB and the third phase depends specifically on IAA.
日本植物生理学会の論文