Frontiers in Plant Science, Journal Year: 2022, Volume and Issue: 13

Published: June 17, 2022

Polyploidization is one of the most common speciation mechanisms in plants. This particularly relevant high mountain environments and/or areas heavily affected by climatic oscillations. Although role polyploidy and temporal geographical frameworks polyploidization have been intensively investigated alpine regions temperate arctic biomes, fewer studies are available with a specific focus on Mediterranean region. Leucanthemopsis (Asteraceae) consists six to ten species several infraspecific entities, mainly distributed western Basin. It polyploid complex including montane, subalpine, strictly lineages, which locally different ranges Western Europe North Africa. We used mixed approach Sanger sequencing (Roche-454) throughput amplicons gather information from single-copy nuclear markers plastid regions. Nuclear were carefully tested for recombinants/PCR artifacts paralogy. Coalescent-based methods infer number events age formation reconstruct reticulate evolution genus. Whereas polyploids within widespread alpina autopolyploids, situation more among taxa endemic Mediterranean. While hexaploid, L. longipectinata, confined northern Moroccan (north-west Africa), an autopolyploid, Iberian clearly allopolyploid origins. At least two gave rise spathulifolia all other tetraploid taxa, respectively. The allopolyploids took place early Pleistocene was probably caused latitudinal elevational range shifts that brought into contact previously isolated lineages. Our study thus highlights importance oscillations connected plant diversity

Language: Английский