水田多年生雑草オモダカ繁殖体の生存状態と出芽に関する生態学的研究 : 第3報塊茎の休眠覚醒および萌芽温度反応

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To analize the processes controlling the breaking of dormancy of tubers in an arrowhead (Sagittaria trifolia L.) under natural conditions in paddy fields, studies on the breaking of dormancy of a tuber population and the sprouting response of a population of non-dormant tubers were carried out. All the experiments were performed in incubators at a controlled temperature. The results obtained are as follows ; 1) To analyze the process of acquisition of dormancy during the formation of the tubers, the sprouting ability was tested from the period of elongation of the storage rhizomes (mid-September) until the final stage of tuber formation (late-November). The population of tubers entered a deep dormancy at the zone of separation from the mother plant. 2) The sprouting process was investigated under light (5,000 1x.) conditions in moist upland soil at a temperature of 30℃ by subjecting the plants to various storage conditions including changes of the ambient temperature, soil moisture conditions, storage period to analyze the process of breaking of the primary dormancy. The pattern of tuber sprouting was varied with the temperature, the soil moisture conditions during the storage, and the storage period. 3) The tuber dormancy was broken with a low ratio of mortality and absence of sprouting during the storage period, when the tubers were stored in moist upland soil for more than 3 weeks at a temperature of 30℃ . At constant temperatures varying from 5℃ to 15℃ , sprouting took place later than at 30℃ . When the tubers were stored at roorn temperature, sprouting occured earlier than when they were stored outdoors. 4) When the tubers were stored in submerged soil, they died rapidly at the temperature of 30℃ . On the other hand , sprouting occurred earlier at the other temperatures and the longer the storage period, the earlier the sprouting. 5) Secondary dormancy of the tubers could not be induced. 6) Time courses of the sprouting of non-dormant tubers at temperatures in the range of 10-40℃ were analized. Constant temperatures of 25, 30℃ or an alternating regime of 30/15℃ were the optimum temperatures for sprouting. Minimum and maximum temperatures for sprouting were about 10℃ and 35-40℃ , respectively.
1989-05-30

水田多年生雑草オモダカ繁殖体の生存状態と出芽に関する生態学的研究 : 第3報塊茎の休眠覚醒および萌芽温度反応

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水田多年生雑草オモダカ繁殖体の生存状態と出芽に関する生態学的研究 : 第3報 塊茎の休眠覚醒および萌芽温度反応

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水田多年生雑草オモダカ繁殖体の生存状態と出芽に関する生態学的研究 : 第3報塊茎の休眠覚醒および萌芽温度反応