期刊
NEW PHYTOLOGIST
卷 183, 期 2, 页码 470-479出版社
WILEY
DOI: 10.1111/j.1469-8137.2009.02861.x
关键词
biotic pollination; comparative method; life form; mating system; outcrossing rate; phylogeny; P:O ratios; wind pollination
P>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. New Phytologist (2009) 183: 470-479doi: 10.1111/j.1469-8137.2009.02861.x.
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