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The growth-promoting role of applied gibberellin has been demonstrated on the responses, such as cell division, elongation, fruiting, flowering and seed germination. Various aspects of these problems were summarized in recent reviews by Brianl), and Stowe and Yamaki2' $ ). Stimulation of seed germination by gibberellin was investigated recently. It has been known that the light requirement of certain seeds such as lettuce and tobacco was eliminated by the application of gibberellin4, 5). Lonas) pointed out, however, that gibberellin would not be expected to act on germination in the same way as red light. Bunsow and von Bredow7) and Poljakoff-Mayber et al.8) also suggested that the process of germination caused by gibberellin might not be the same as that caused by light. In the meantime, the separation of the whole process of the germination into several physiological phases has been carried out by Isikawa9) and Isikawa and Fujiilo). It was also shown by Toole et al.") that three distinct stages were remarkable in the processes of seed germination, namely (a) imbibition of water, (b) cell elongation, and (c) increase in cell number. The present paper is concerned with the effects of applied gibberellin on the germination processes of Sedum seed.

The Effects of Gibberellin on the Germination of the Seeds of Sedum kamtschaticum Fisch