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

本论文运用染色体细胞学、分子细胞遗传学、人口学和种群生物学等方法，对与日本植物群有直接关系的东欧亚濒危植物进行了分子细胞遗传学、人口学和种群生物学的研究。本研究以广义菊花为研究中心，与百合科、兰科、禾本科、毛茛科、蔷薇科、虎耳草科等植物进行了多方面的研究，证实了广义菊花不仅在日本列岛，而且在欧亚大陆东部也可能通过同源和异源多倍体化和杂交而发生物种分化和进化。广义菊花是自然多倍体化的典型代表，也是东欧亚植物区系组成的典型代表。日本植物群的种类与中国植物群有直接或间接的亲缘关系，并逐渐减少到西伯利亚阿尔泰、亚布洛诺伊和俄罗斯锡霍特阿林等寒冷地区的植物群。特别是2005年我们研究的Yablonoy被东亚植物区系成分组成的植被所覆盖，东亚种间的染色体关系大多相同或密切相关。我们还必须继续用更多的资料来研究、澄清和证明我们关于日本植物区系成分和东欧亚大陆植物区系的种间关系的概念。

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.