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

本文采用染色体细胞学、分子细胞遗传学、人口学和种群生物学等方法，对与日本植物区系直系关连的欧亚东部濒危物种进行了分子细胞遗传学、人口统计学和种群生物学的研究。以菊花为研究对象，对百合科、兰科、禾科、毛茛科、蔷薇科、沙棘科等进行了综合研究。我们已经证实，在日本列岛和欧亚大陆东部，赤藓属植物可以通过自倍体和异倍体多倍体和杂交形成和进化。菊花可作为自然多倍体化的独特模式和欧亚东部植物区系构成的代表性模式。日本植物群的种类与中国植物群有直接或间接的密切联系和集中，然后逐渐减少到西伯利亚阿尔泰、Yablonoy和俄罗斯Sikhote Alin等寒冷地区的植物群。特别是2005年研究的雅布洛伊属植物被东亚植物区系成分组成的植被覆盖，其染色体关系在东亚种间基本相同或密切相关。用同样的方法，我们必须不断地用更多的数据文献来研究、澄清和证明我们关于日本植物区系元素和东欧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.