Genetic Variability of the Vulnerable Plant Species Ludwigia peploides ssp. stipulacea in Japan

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  • 絶滅危惧植物ミズキンバイの国内における遺伝的多様性
  • ゼツメツ キグ ショクブツ ミズキンバイ ノ コクナイ ニ オケル イデンテキ タヨウセイ

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We researched the internal genetic variability of Ludwigia peploides ssp. stipulacea which was designated as a vulnerable plant species in Japan. The samples of 11 sites in Chiba, Kanagawa, Kochi and Miyazaki pref. were analyzed by Randomly Amplified Polymorphic DNA (RAPD) method. PCR produced amplified DNA with 10 out of 18 primers. The closely related species L. adscendens misses the some major bands which presence in all samples of L. peploides ssp. stipulacea in 5 cases of PCR. These can be used as differential DNA markers between two species. Only one primer showed DNA polymorphism of major bands, especially, differentiating group of south Miyazaki and Muroto Cape from others. However, since most major bands are common among samples, it was clarified that the internal genetic variability was relatively low in this species. This is a result of supporting the hypothesis of Maekawa (1943) who assumed the prehistoric naturalized plant as for L. peploides ssp. stipulacea. We discussed the distribution process of this plant species in Japan after introducing with the rice farming.

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