Abstract
Polyploids from cultured shoot tips of Eucalyptus globulus were produced by treatment with colchicine. Results showed that the combination of 0.5% colchicine and treating multiple shoot clumps for 4 days was the most appropriate conditions for E. globulus polyploidy induction and the effect of the use of multiple shoot clumps for colchicine polyploidy-induced was better than single buds. By comparing the polyploidy plants with normal diploid ones in morphology, leaves of polyploid plants were thicker, larger, and darker green. The chromosome number of polyploidy plants that had been identified in morphology was 2n = 4x = 44, while that of diploids was 2n = 2x = 22.
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