OCCURRENCE AND BIOASSAY RESPONSES OF G - PLANT-GROWTH REGULATOR IN EUCALYPTUS AND OTHER MYRTACEAE

A growth regulator (G) occurs at high concentrations in adult leaves of E. grandis Maiden. Low concentrations of G are present in juvenile leaves of this species and also in adult leaves of some other Myrtaceae. Low concentrations of G (5×10-6 and 10-5 M) promote rooting in mung-bean cuttings and elongation in Avena coleoptile sections; high concentrations (5×10-4 M) inhibit. These and other bioassay results indicate that G may have auxin-like activity. © 1979 Springer-Verlag.