Pollination mode and life form strongly affect the relation between mating system and pollen to ovule ratios
Article first published online: 7 MAY 2009
© The Authors (2009). Journal compilation © New Phytologist (2009)
Volume 183, Issue 2, pages 470–479, July 2009
How to Cite
Michalski, S. G. and Durka, W. (2009), Pollination mode and life form strongly affect the relation between mating system and pollen to ovule ratios. New Phytologist, 183: 470–479. doi: 10.1111/j.1469-8137.2009.02861.x
- Issue published online: 25 JUN 2009
- Article first published online: 7 MAY 2009
- Received: 30 January 2009, Accepted: 15 March 2009
- biotic pollination;
- comparative method;
- life form;
- mating system;
- outcrossing rate;
- P : O ratios;
- wind pollination
- • Pollen to ovule (P : O) ratios have been hypothesized to correlate with the degree of outcrossing and thus with the mating system of a plant. Also, P : O ratios are likely to vary with respect to pollination mode (i.e. wind pollination or animal pollination). Furthermore, constraints on the evolution of mating systems depending on life form may affect P : O ratios.
- • We compiled P : O ratios and outcrossing rates for 107 angiosperm species and analyzed the relation between these traits considering pollination mode, life form and phylogenetic relatedness among species.
- • In general, P : O ratios correlated significantly with outcrossing rates. However, when taking additional factors into account, the relation became ambiguous. The correlation was significantly positive in wind-pollinated species, but only marginally so in animal-pollinated species. Wind-pollinated species had higher P : O ratios than animal-pollinated taxa. In woody perennials, outcrossing was the predominant mating system and outcrossing rates did not correlate with P : O ratios. The results were not altered by accounting for phylogenetic relatedness among species.
- • The results indicate that P : O ratios vary more strongly with pollination mode and life form than with the mating system.