PREMISE OF THE STUDY: Long-distance dispersal can affect speciation processes in two opposing ways. Dispersal can promote geographic isolation or it can bring together geographically distant and distantly related genotypes, thus counteracting local differentiation. We used the Gulf Coast of North America (GC), a "hot spot" of reed diversity and evolutionary dynamics, as a model system to study the diversification processes within the invasive, cosmopolitan, polyploid grass Phragmites. METHODS: Genetic diversity was studied using collections representing all species of the genus and from all continents (except Antarctica). A range of molecular markers, including chloroplast and nuclear sequences, microsatellites, and AFLPs, was analyzed to detect DNA variation from the population to the species level and to infer phylogenetic relationships across continents. KEY RESULTS: An interspecific hybrid, Phragmites mauritianus × P. australis, and four P. australis cp-DNA haplotypes from Africa, Europe, and North America have been dispersed to the GC and interbreed with each other. CONCLUSIONS: Long-distance dispersal and weak breeding barriers appear to be recurring phenomena, not only in the GC, but worldwide. We present data strongly suggesting that interspecific hybridization and introgression among different Phragmites species take place and appear to have contributed significantly to the diversification processes within the genus. Hence, the application of traditional species concepts within Phragmites might be inappropriate.
PREMISE OF THE STUDY: Long-distance dispersal can affect speciation processes in two opposing ways. Dispersal can promote geographic isolation or it can bring together geographically distant and distantly related genotypes, thus counteracting local differentiation. We used the Gulf Coast of North America (GC), a "hot spot" of reed diversity and evolutionary dynamics, as a model system to study the diversification processes within the invasive, cosmopolitan, polyploid grass Phragmites. METHODS: Genetic diversity was studied using collections representing all species of the genus and from all continents (except Antarctica). A range of molecular markers, including chloroplast and nuclear sequences, microsatellites, and AFLPs, was analyzed to detect DNA variation from the population to the species level and to infer phylogenetic relationships across continents. KEY RESULTS: An interspecific hybrid, Phragmites mauritianus × P. australis, and four P. australis cp-DNA haplotypes from Africa, Europe, and North America have been dispersed to the GC and interbreed with each other. CONCLUSIONS: Long-distance dispersal and weak breeding barriers appear to be recurring phenomena, not only in the GC, but worldwide. We present data strongly suggesting that interspecific hybridization and introgression among different Phragmites species take place and appear to have contributed significantly to the diversification processes within the genus. Hence, the application of traditional species concepts within Phragmites might be inappropriate.
Authors: Jeannie Mounger; Malika L Ainouche; Oliver Bossdorf; Armand Cavé-Radet; Bo Li; Madalin Parepa; Armel Salmon; Ji Yang; Christina L Richards Journal: Philos Trans R Soc Lond B Biol Sci Date: 2021-04-19 Impact factor: 6.671
Authors: Eric L G Hazelton; Thomas J Mozdzer; David M Burdick; Karin M Kettenring; Dennis F Whigham Journal: AoB Plants Date: 2014-03-17 Impact factor: 3.276
Authors: Franziska Eller; Hana Skálová; Joshua S Caplan; Ganesh P Bhattarai; Melissa K Burger; James T Cronin; Wen-Yong Guo; Xiao Guo; Eric L G Hazelton; Karin M Kettenring; Carla Lambertini; Melissa K McCormick; Laura A Meyerson; Thomas J Mozdzer; Petr Pyšek; Brian K Sorrell; Dennis F Whigham; Hans Brix Journal: Front Plant Sci Date: 2017-11-16 Impact factor: 5.753