Studies on characteristics of molecular cytogenetics and demography in certain endangered plant species of Eurasian continent involved with flora of Japan

我们利用染色体细胞学、分子细胞遗传学、人口学和种群生物学的方法，重点研究了与日本植物区系直接相关的东亚濒危物种的分子细胞遗传学、人口学和种群生物学特征。我们以菊花为研究中心，对百合科、兰科、禾本科、毛茅科、蔷薇科、虎耳草科等植物进行了多样化的研究。我们已经证实，菊花不仅可以在日本群岛，而且可以通过同源和异源多倍化和杂交在东亚大陆进行物种形成和进化。菊花是天然多倍化的独特模式，也是东亚植物区系组成的代表模式。日本植物区系的物种与中国植物区系有直接或间接的亲缘关系和集中分布，在西伯利亚的阿拉泰、亚勃罗诺伊和俄罗斯的锡霍特阿林等寒冷地区逐渐减少为中国植物区系。特别是我们2005年研究的亚布洛尼被东亚植物区系成分组成的植被所覆盖，它们的染色体亲缘关系在东亚物种之间基本相同或密切相关。通过使用同样的方法，我们必须不断地用更多的数据文件来研究、澄清和证明我们关于日本植物区系成分和东亚大陆植物区系的物种关系的概念。

We focused the research in characterization of molecular cytogenetics and demography and population biology in certain endangered species of East Eurasian element directly related to Japanese flora by approaches in chromosome cytology, molecular cytogenetics, demography and population biology. We put Chrysanthemum sensu lato in research center and made diversed studies with the Liliaceae, Orchidaceae, Poaceae, Ranunculaceae, Rosaceae, Saxifragaceae, and so on. We have approved that Chrsanthemum could have speciation and evolution not only in Japanese Archipelago but also in the East Eurasian Continent by auto- and allo-polyploidization and hybridization. Chrysanthemum sensu lato can be the distinct model of natural polyploidization and the representative model of East Eurasian Floristic constitution. The species of Japanese flora could be directly and indirectly closely related and concentrated to Chinese flora and then gradually decreased to flora in colder regions such as Siberian Altai, Yablonoy as well as Sikhote Alin, Russia. Easpecially Yablonoy we studied in 2005 was covered by the vegetation consisted of East Asiatic floristic element and their chromosomal relationships were mostly the same or closely related among East Asian species. By using our same methodology, we must study, clarify and justify with many more data documentation continuously our concept of species relationships of Japanese floristic element and the floristics of East Eurasian continent.