Abstract
Crystalline materiales contained in the juices of flowering induced plants such as vernalized radish and shortdayed cocklebur were analysed by the x-ray diffractometer, geigerflex, and the constituents of flower regulating factors were discussed in this paper. In the case of radish, two kinds of juices were obtained from the fresh tops of both vernalized-longdayed radish seedlings and the nonvernalized-longdayed. As to the of cocklebur, the one was obtained from the absolutely longdayed plants and the other two juices were squeezed from the plants treated with 10 and 28 days' short photoperiods. The apparent difference between the check and the flowering induced plants was observed in both cases of radish and cocklebur, comparing with the diagrammatic results recorded by the x-ray diffractometer. It may be considered that a certain crystalline substance exists in the flowering non-induced plants, but some other crystalline substance dominates in the flowering induced plants. The former would play as the inhibitor, and the latter would play as the promotor in the flowering mechanism.
