Polyploidy and self-compatibility: is there an association?
Article first published online: 19 MAR 2004
Volume 162, Issue 3, pages 803–811, June 2004
How to Cite
Mable, B. K. (2004), Polyploidy and self-compatibility: is there an association?. New Phytologist, 162: 803–811. doi: 10.1111/j.1469-8137.2004.01055.x
- Issue published online: 19 MAR 2004
- Article first published online: 19 MAR 2004
- Received: 21 November 2003 Accepted: 27 January 2004; doi: 10.1111/j.1469-8137.2004.01055.x
- association tests;
- • Researchers have hypothesized that self-compatibility (SC) should be more common in polyploid taxa than their diploid counterparts because of selection for reproductive assurance and/or the expected decline in inbreeding depression associated with having ‘extra’ gene copies. Support for this view has come from an observed breakdown of self-incompatibility (SI) in some species with a gametophytic system (GSI). The purpose of this research was to assess the strength of this relationship across a wider array of SI systems.
- • A large database, of diploid chromosome numbers, ploidy levels, and types of SI system, was assembled for angiosperm species and used to test for an association between ploidy and SC.
- • No strong association was found between SC and polyploidy at the level of species or families, and there was no evidence that those having a functional SI system also had fewer polyploid taxa or that most polyploids experience a breakdown in SI.
- • These results challenge the assumption that self-fertilization is strongly associated with polyploidy and suggest directions for further research on the evolution of polyploidy in relation to SI.