Vanhoenacker Didrik, Agren Jon, Ehrlén Johan
Department of Botany, Stockholm University, SE-106 91 Stockholm, Sweden.
New Phytol. 2006;169(3):615-21. doi: 10.1111/j.1469-8137.2005.01615.x.
In plant populations where reproductive output is limited by pollinator visitation, plants with attractive floral displays should have a selective advantage. We examined the effect of inflorescence height on pollination success in Primula farinosa, which is dimorphic for scape length. To test the hypothesis that fruit and seed initiation are more strongly pollen-limited in the short-scaped than in the long-scaped morph, and that this difference is affected by spatio-temporal variation in pollen limitation, we conducted a hand-pollination experiment in four populations over 2 yr. Pollen limitation of fruit initiation varied among populations and years, and was stronger in the short-scaped than in the long-scaped morph. The results suggest that interactions with pollinators will need to be considered for a full understanding of the maintenance of this striking polymorphism. The study also shows that, although pollen limitation is likely to vary in space and time in many plant species, such variation is not necessarily associated with variation in selection on floral characters.
在繁殖产出受传粉者访花限制的植物种群中，具有吸引人的花展示的植物应具有选择优势。我们研究了报春花属植物中花序高度对授粉成功率的影响，报春花属植物的花葶长度具有二态性。为了验证以下假设：与长花葶形态相比，短花葶形态的果实和种子形成受花粉限制的程度更强，且这种差异受花粉限制的时空变化影响，我们在4个种群中进行了为期2年的人工授粉实验。果实形成的花粉限制在不同种群和年份有所不同，短花葶形态比长花葶形态受影响更强。结果表明，要全面理解这种显著多态性的维持，需要考虑与传粉者的相互作用。该研究还表明，尽管在许多植物物种中花粉限制可能在空间和时间上有所变化，但这种变化不一定与花性状选择的变化相关。
