Genetic diversity of an endangered aquatic plant,Potamogeton lucens subspecies sinicus |
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| Affiliation: | 1. Graduate School of Horticulture, Chiba University, 648 Matsudo, Chiba 271-8510, Japan;2. Ibaraki Nature Museum, 700 Osaki, Bando, Ibaraki 306-0622, Japan;3. Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, CAS, Kunming 650204, China;4. Musashino School of Paleontology, 3-20-7 Chuo, Musashi-murayama, Tokyo 208-0003, Japan;1. Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China;2. Graduate School of Horticulture, Chiba University, Chiba 271-8510, Japan |
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| Abstract: | The genetic diversity of the species, Potamogeton lucens subsp. sinicus var. teganumensis, which is critically endangered in Japan, was investigated. This species now occurs in only two known localities in Japan. One is a native population (Oitoike population), but the other (Teganuma-Okahotto population) is found in a small artificial pond that was dug in 1998. It is considered that the Teganuma-Okahotto population grew from a soil seed bank. Based on RAPD variation, we compared the genetic diversity of the two populations of P. lucens var. teganumensis in Japan and one population of P. lucens subsp. sinicus var. sinicus in China. The Teganuma-Okahotto population showed RAPD variation, suggesting that it may be derived from more than one seed buried in old sediments. This population also had the highest value of Shannon's Information Index among the three study populations. This finding suggests that seeds buried in sediments can contain genetic variability, and may be used to conserve the genetic diversity of rare and endangered plants. |
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