Origins of Diploid Dactylis from the Canary Islands as Determined by DNA Sequencing
Two diploid forms of Dactylis are known to occur on the Canary Islands, Dactylis smithii at low altitude and the newly discovered Dactyls metlesicsii at high altitude. Nuclear ITS sequences of these two diploid forms were compared with a wider set of diploids from Spain, Portugal and North Africa. The results suggest that Dactylis has a dual origin in these islands. The newly discovered high altitude form metlesicsii was found to have originated from the Iberian Peninsula unlike the low altitude form smithii which originated from nearby North Africa. It is also likely that hybrid forms occur where their ranges overlap.
KeywordsCanary Island Cape Verde Island Tetraploid Form Dual Sequence Diploid Form
- Schönfelder P, Ludwig D (1996) Dactylis metlesicsii (Poaceae), eine neue art der Gebirgsvegetation von tenerife, kanariische inseln. Willdenowia 26:217–223Google Scholar
- Stebbins GL, Zohary D (1959) Cytogenetic and evolutionary studies in the genus Dactylis. I morphological, distribution and inter relationships of the diploid subspecies. Univ Calif publ bot 31:1–40 (California university press, Berkeley, Los Angeles p 40)Google Scholar
- Wetschnig W (1991) Karyotype morphology and some diploid subspecies of Dactylis glomerata L. (Poaceae). Phyton Horn 31:35–55Google Scholar