マツバボタンの種子の発芽に関する研究-1-

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The experiments presented here were designed to investigate the methods for the breaking of the dormancy of Portulaca grandiflora seeds, and the results are summarized as follows: 1. The moist low-temperature stratification was very effective in hastening the after-ripening of Portulaca seeds. But, when the moist seeds were exposed to 30°C before or during the stratification, the after-ripening of the seeds did not proceed at all. The stratification under oxygen deficiency de-layed the after-ripening of the seeds, and the seeds stratified under the saturation of oxygen or carbon dioxide almost remained in the dormant state. In addition, the seeds which were stratified after one year's storage at room temperature showed the decreased after-ripening as compared with those stratified immediately after the harvesting. 2. The drying of the seeds after the stratifica-tion increased the germination capacity significantly and this increased germination capacity were main-tained for as long as 5 weeks. The germination capacity once endowed by the drying after the stra-tification, however, was decreased by the moisten ing after the drying, and thus the germination ca-pacity was reversed repeatedly by the alternative drying and moistening. 3. The dormant seeds did not germinate during 5 months when they were kept on the moist sub-stratum at 30°C. 4. The optimum temperature for the germination of Portulaca grandiftora seeds seems to be rather high. The germination was obtained even at 40°C though it was decreased at such high temperature. 5. The solution of thiourea and KNO3 or the fumigation by CN-gas increased the germination, though their effects were not so great. Moreover, the high concentration of thiourea and KNO3 inclined to delay the germination at low-temperature. But, this tendency was undetectable when the seeds were germinated at high temperature. 6. The time required for the maturation of seeds was about 10 days, but it was shortened when the period of maturation was shifted so later that the temperature became higher.
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マツバボタンの種子の発芽に関する研究-1-

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