ガンマ線照射によるチューリップの芽条変異誘発に関する研究 I : チューリップの栄養繁殖法と球根の生理条件について
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The vegetative propagation, CO2 production and water content of the bulbs favorable for induction of bud mutations were examined. The results are summarized as follows:The floral organ which will give a flower in the first spring is formed in mid-November, and at the same time, the main bud which will flower in the second season is indicated by 2-3 scales. The growing point which will give a flower in the third spring, is differentiated inside those scales during the first spring. The bulbils did not have flowers if they grew up to be less than 8cm in circumference.In the previous paper, the irradiation was carried out mostly during September to November, and the color sporting of petals was observed during four successive vegetative generations after irradiation. This procedure explains the previous results; i. e., the tissues of the tulip bulb mentioned above, namely, the floral organ, the main bud and the growing point were irradiated at the same time, and consequently it appears that a change induced in the floral organ will appear in the first spring and a change induced in the main bud or the growing point will appear in the flower of the second or third spring respectively.CO2-production of tulip bulbs during 120 days of starage was measured by the gas flow method and the value of 4-10×10-3mg/1g fresh wt/1hr was obtained, which approaches that obtained from dry seeds of other plants. The greater susceptibility of tulip bulbs to radiation is probably due to their greater water content, which, in this experiment, was determined to be 56-58%.
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