The origin of a novel form of Senecio (Asteraceae) restricted to sand dunes in southern Sicily
Article first published online: 11 MAR 2005
Volume 166, Issue 3, pages 1051–1062, June 2005
How to Cite
Chapman, M. A. and Abbott, R. J. (2005), The origin of a novel form of Senecio (Asteraceae) restricted to sand dunes in southern Sicily. New Phytologist, 166: 1051–1062. doi: 10.1111/j.1469-8137.2005.01393.x
- Issue published online: 11 MAR 2005
- Article first published online: 11 MAR 2005
- Received: 2 December 2004 Accepted: 11 January 2005
- chloroplast DNA;
- morphometric analysis;
- random amplified polymorphic DNAs (RAPDs);
- • The taxonomy of diploid Mediterranean Senecio sect. Senecio (Asteraceae) is complex, owing to a recent species radiation, high morphological plasticity and occasional interspecific hybridization.
- • A study was conducted to resolve the origin of a novel form of Senecio restricted to sand dunes in southern Sicily, Italy. This has been described previously as morphologically intermediate to Senecio gallicus and Senecio glaucus ssp. coronopifolius, indicating a possible hybrid origin, or as a variant of Senecio leucanthemifolius.
- • Plants of this form grown in a glasshouse were morphologically intermediate to S. glaucus and S. leucanthemifolius, but were also similar to some cultivated individuals of S. gallicus. No evidence for a hybrid origin was obtained from a survey of random amplified polymorphic DNA variation; instead the plants surveyed were most closely allied to Tunisian S. glaucus. They were also polymorphic for the same set of cpDNA haplotypes present in Tunisian S. glaucus.
- • We conclude that the Sicilian Senecio is a variant form of North African S. glaucus ssp. coronopifolius, which most probably dispersed to sand dunes in southern Sicily in the relatively recent past. The presence of several cpDNA haplotypes in this material indicates that there have been multiple introductions of the species to Sicily.