Natural hybridization between cultivated poplars and their wild relatives: evidence and consequences for native poplar populations

It is recognized that introgressive hybridization and gene flow from domesticated species into their wild relatives can have a profound effect on the persistence and evolution of wild populations. Here, we review published literature and recent data concerning introgressive hybridization involving numerous species of the genus Populus. First, we briefly refer to some concepts and terminology before
reviewing examples of natural and anthropogenic hybridization. Second, we examine whether natural genetic barriers could limit introgressive
hybridization. Threat and possible consequences of anthropogenic hybridization are discussed in order to finally suggest conservation strategies for native poplar populations.