In the vegetative propagation with aterminal cutting in Chrysanthemum morifolium 'Ki-Amagahara', the efects of controlled environmental factors of four temperature levels of 30℃, 25℃, 20℃ and 15℃,and a continuous light regime in 25℃, on the rooting responses and the increasing rate in number of roots were investlgated. Callus formation and rooting were recognized as faster in higher temperatures than in lower ones in the order of 30℃, 25℃, 20℃ and 15℃, and, under the continuous light regime, the rooting was promoted as compared with the cutting in natural photoperiod. On the other hand,in the increasing rate in number of roots there was no significant differences among the cuttings in those temperatures. A certain regression coefficient of +3.662 was reckoned as an average. It was suggested that the increasing rate of adventitious root in Chrysanthemum cuttings were not affected under any temperature conditions and continuous light regime.
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