关键词: 石斛, 景天酸代谢, 光合作用, 分子系统学

Abstract: Status quo of research on photosynthesis in Dendrobia was reviewed. The paper summarized the characters of photosynthetic carbon assimilation pathway in the plants with crassulacean acid metabolism，and emphasis was placed on genus Dendrobium. The relation between expression of crassulacean acid metabolism and ecological environment was analyzed，furthermore，it was concluded that there was geographical segregation in terms of photosynthetic carbon assimilation pathway within genus Dendrobium. The problems existed in current study on phylogeny in genus Dendrobium were estimated and the priority for future research were suggested，which meant that the biological mechanism of geographical segregation considering photosynthetic carbon assimilation pathway within genus Dendrobium would be decoded by the means of molecular phylogeny.

Key words: Dendrobium, crassulacean acid metabolism, photosynthesis, molecular phylogeny