Phenotypic Plasticity And Adaptation Of Solidago Canadensis

Solidago canadensis had become one of the most harmful alien invasive plants. In order to understand the response pattern of S. canadensis to the drought stress and temperature,15populations collected from the eastern coast of China and Yangtze River Valley were measured in wild habitat and conducted in common garden. Results showed that:1) The variance component between the groups was larger than that among groups of S. canadensis in the wild.2) Growth index and biomass index decreased obviously, but the root-shoot ratio increased significantly in drought condition. It was an adaptive strategy for S. canadensis confronting the drought condition. And lower physiological activity could also help the individuals prevent the water.3) The temperature did not significantly affect the length and width of S. canadensis, but changed biomass partitioning significantly. And it had significant effect on most of physical index except for net photosynthetic rate, which maybe suggested that the adaptation was found in physical index rather than growth and biomass index.4) The plasticity of phenotypic traits was also various in different populations and organs of S. canadensis collected from different geographical locations.5) Clustering analysis based on phenotypic plasticity did not cluster into different groups. And Mantel test results showed that there was no significant correlationbetween Euclidean distance of phenotypic plasticity and geographic distance, which might be due to the invasive history of multiple times introduction into multiple locations. So it maybe did not adapt the local environmental factor significantly. This study firstly discussed the response pattern to temperature and drought stress based on S. canadensis from different geographical provenance. The results not only broaden the theoretical system of invasive ecology, but also provided the reference for prevention to the alien invasive plants.