EFFECT OF STEM EXTRACTS OF EUCALYPTUS LH22 AND U6 CLONES ON THE ROOTING OF MUNG BEAN CUTTINGS AND ON GERMINATION OF SEEDS

The results of this investigation indicated that the crude stem extract of Eucalyptus LH22 clone (Eucalyptus urophylla S. T. Blade Eucalyptus camaldulensis Dehnhardt) , which was difficulty -to - root, inhibited evidendy the rooting rate and the length of roots of mung bean cuttings. Other-wise, there was no case in the U6 clone (Eucalyptus urophylla S. T. Blade U6 clone) , which was easy - to - root. The crude extractions were purified by organic solvent extraction methods, and then all kinds of extractions were tested by seed germination. The experiments revealed that there were stron-ger inhibitory ingredients existed in water extract and ether extract by analysis of Duncan' s SSR. But there was no inhibiting effect in the extract of U6 clone. The inhibiting fractions were purified further by silica gel column chromatography and the result showed that different inhibitory activities were exis- ted among the several purified fractions. So, It' s concluded that there were several different ingredi-ents of inhibitors in the stem of LH22 clone and less inhibitors in the steni of U6 clone.