Adaptation Evolutionary Mechanism of Ex-situ Conserved Small Population of Taxus wallichiana var. mairei

Abstract:

To explore the adaptation mechanism of ex-situ conserved population of Taxus wallichiana var. mairei, the community structure, genetic diversity and genetic structure of ex-situ conserved population as well as its derived populations in Nanjing Botanical Garden were studied with the wild populations in northwestern Jiangxi as control. The results showed that both the wild populations and ex-situ conserved populations maintained high genetic diversity, and the genetic diversity of the wild populations was a little higher than that of the small exsitu conserved populations, but individual density in ex-situ conserved populations was higher than that of wild populations. At same time, the genetic variation within population was bigger than that between populations. In whole, ex-situ populations, showing unconspicuous founder effect, are still in the early succession and has potential to further development.

Key words:Taxus wallichiana var. mairei;Ex-situ conserved population;Wild population;ISSR;Genetic diversity;Genetic structure