オモダカ科雑草の生育と繁殖体形成に及ぼす水位の影響

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To demonstrate the adaptability to variations in the water level of such Alismataceae weeds as Sagittaria trifolia, S. aginashi, Alisma canaliculatum and A. plantago-aquatica, the effect of variations in the water level on the growth and production of propagules was examined for the following five different water levels: -3 cm, 3 cm, 15 cm, 25 cm and 50 cm above the soil surface in 1980 and 1981. The plants developed by vegetative propagation from tubers in S. trifolia and stocks in A. plantago-aquatica were able to produce a large amount of seeds and vegetative propagules for a 50 cm water level. In contrast, for the same water level S. aginashi propagated from corms and A. canaliculatum from stocks produced a few propagules only when large structures were used for the propagation. This difference may be attributed to the fact that the former species has larger propagules and a higher ability in petiole elongation than the latter ones. The plants developed from seeds in S. trifolia and A. canaliculatum produced both seeds and vegetative propagules, whereas S. aginashi and A. plantago-aquatica produced only a few stocks when the water level reached 25 cm. Seedlings of Alisma species survived longer than those of Sagittaria when the water level was below the soil surface. The optimum water level for growth and propagule formation was found to be 15 cm in S. trifolia propagated from tubers, and 3 cm in S. aginashi propagated from corms, as well as in A. canaliculatum and A. plantago-aquatica propagated by seed.
1983-10-25

オモダカ科雑草の生育と繁殖体形成に及ぼす水位の影響

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