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首页> 外文期刊>植物研究雑誌 >Rediscovery of the Wild-Extinct Species Nitellopsis obtusa (Charales) in Lake Kawaguchi, Japan
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Rediscovery of the Wild-Extinct Species Nitellopsis obtusa (Charales) in Lake Kawaguchi, Japan

机译：在日本川口湖重新发现野生灭绝物种东北虎（Charales）

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摘要

The Charales are especially endangered in Japanese inland waters. Of the 74 charalean green algae taxa known from Japan, about half are on the Japanese red list of threatened or endangered species. Although the charalean species Nitellopsis obtusa (Desvaux) Groves once grew in four Japanese lakes, field surveys in 1992-1993 suggested that this species was extinct in the wild in Japan. However, during our 2003 field survey, N. obtusa was collected from natural populations growing in Lake Kawaguchi. The thalli had giant bract-cells and stars (asexual reproductive organs), which are the diagnostic characters of N. obtusa. One-year-old cultured plants developed oogonia. In addition, a phylogeny developed by using sequences from the gene encoding the large subunit of the enzyme rubisco (rbcL) demonstrated that the alga collected from Lake Kawaguchi, a laboratory-maintained sample of N. obtusa from Lake Nojiri (Japan) and a German N. obtusa specimen formed a robust clade within the Charales.
机译：Charales在日本内陆水域特别濒危。日本已知的74种charalean绿藻类群中，约有一半在日本濒危或濒危物种红色名录中。尽管Charalean物种Nitellopsis obtusa（Desvaux）Groves曾经生长在日本的四个湖泊中，但1992-1993年的实地调查表明，该物种在日本的野生环境中已灭绝。但是，在我们2003年的实地调查中，钝齿猪笼草是从川口湖中生长的自然种群中收集的。 al里有巨大的片细胞和星星（无性生殖器官），这是钝齿猪笼草的诊断特征。一岁的栽培植物发展了卵子。此外，通过使用来自编码rubisco（rbcL）酶大亚基的基因的序列开发的系统发育研究表明，从川口湖收集的藻类，实验室保存的野ji猪笼草（日本）和德国人的实验室样品钝角猪笼草标本在Charales内形成了坚固的分支。

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