THE EFFECT OF SELECTED PLANT HORMONES ON IN-VITRO PROLIFERATION OF HYPHAE OF GLOMUS-FISTULOSUM

Effects of N-6-benzyladenine, kinetin, zeatin, N-6-benzyladenosine, ki netin riboside, zeatin riboside, jasmonic acid, indole-3-acetic acid, indole-3-butyric acid, indole-3-propionic acid, abscisic acid and gibb erellic acid on proliferation of hyphae of arbuscular mycorrhizal (AM) fungus Glomus fistulosum were studied under axenic conditions in vitr o. The growth of intraradical hyphae of G. fistulosum was fully suppre ssed by 30 mu M indole-3-acetic acid, but a perceptible decrease in th e proliferation of the hyphae was observed already at 3 mu M. Because such concentration is near the concentrations common in root tissues i n vivo, the effect may be biologically significant. Similar effect was also observed for Glomus mosseae. Inhibitory effects of abscisic acid and cytokinins occurred only at very high, non-physiological concentr ations. Ribosylated cytokinins showed stronger inhibition effects than their non-ribosylated counterparts. No stimulation of proliferation o f hyphae by any plant hormone tested was observed.