Abstract
Plants on oceanic islands often originate from self-compatible (SC) colonizers capable of seed set by self-fertilization. This fact is supported by empirical studies, and is rooted in the hypothesis that one (or few) individuals could find a sexual population, whereas two or more would be required if the colonizers were self-incompatible (SI). However, a SC colonizer would have lower heterozygosity than SI colonizers, which could limit radiation and diversification of lineages following establishment. Limited evidence suggests that several species-rich island lineages in the family Asteraceae originated from SI colonizers with some “leakiness” (pseudo-self-compatibility, PSC) such that some self-seed could be produced. This study of Tolpis (Asteraceae) in Macaronesia provides first reports of the breeding system in species from the Azores and Madeira, and additional insights into variation in Canary Islands. Tolpis from the Azores and Madeira are predominately SI but with PSC. This study suggests that the breeding systems of the ancestors were either PSC, possibly from a single colonizer, or from SI colonizers by multiple disseminules either from a single or multiple dispersals. Long-distance colonists capable of PSC combine the advantages of reproductive assurance (via selfing) in the establishment of sexual populations from even a single colonizer with the higher heterozygosity resulting from its origin from an outcrossed source population. Evolution of Tolpis on the Canaries and Madeira has generated diversity in breeding systems, including the origin of SC. Macaronesian Tolpis is an excellent system for studying breeding system evolution in a small, diverse lineage.
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Acknowledgements
This work was supported by a General Research Fund grant from KU EEB to MEM. The authors wish to thank Katie Sadler, Clare Prohaska, Sidrah Sheikh, Matthew Gibson, Jacob Ressler, Ben Kerbs, and Luke Greene for assistance with plant propagation, and for assessing levels of pollen fertility and seed set. Hanno Schäfer provided seeds of Tolpis succulenta from the Azores.
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Crawford, D.J., Anderson, G.J., Silva, L.B. et al. Breeding systems in Tolpis (Asteraceae) in the Macaronesian islands: the Azores, Madeira and the Canaries. Plant Syst Evol 301, 1981–1993 (2015). https://doi.org/10.1007/s00606-015-1210-5
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DOI: https://doi.org/10.1007/s00606-015-1210-5