Abstract
Two hundred or 1000ppm′s of gibberellic acid injected close to the apical meristem of Japanese taro cultivars, Colocasia esculenta Schott, including "eddoe" and "dasheen", stimulated flowering, although no difference due to concentration was detected. Flower formation was observed in both triploid and diploid cultivars, ′Ishikawa-wase′, ′Aichi-wase′, ′Sanshu′ and ′Daikichi′, and ′Ebi-imo′ and ′Takeno ko-imo′, respectively. In all cultivars flag leaves, signs of the transformation from vegetative to reproductive growth, were induced. In cultivars which do not flower readily, only spadixless flowers were induced. In the easy flowering cultivar, abnormal flowers were induced. From these results, it was concluded that flower stimulation may be a continuous process rather than an "all-or-nothing" event. The morphological characters of the spadix induced by gibberellic acid were discussed in terms of the classification of Colocasia cultivars.
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