Conner Jeffrey K, Zangori Laura A
Department of Ecology, Ethology, and Evolution, University of Illinois, Shelford Vivarium, 606 E. Healey St., Champaign, IL 61820, USA, , , , , , US.
Oecologia. 1997 Jul;111(3):388-395. doi: 10.1007/s004420050250.
While a large number of studies have examined the effects of increased ultraviolet-B radiation (UV-B) on growth and physiological function of plants, UV-B effects on pollination success and fitness are poorly understood. To examine this question, we measured growth, timing of flowering, pollination success, production of pollen, ovules, flowers, fruits, and seeds, and quality of offspring produced by Brassica nigra and B. rapa in a garden experiment. A total of 313 plants of the two species were randomly divided into two treatment groups. One group received only natural ambient levels of UV-B, while the other received an artificially enhanced UV-B dose. Fitness of B. nigra declined at the higher UV-B dose while B. rapa fitness did not change. One possible cause of this result was a shift in the relative attractiveness of the two species to pollinators: visitation to B. nigra declined at the high UV-B dose while B. rapa visitation increased.
虽然大量研究探讨了增强的紫外线B辐射（UV-B）对植物生长和生理功能的影响，但UV-B对授粉成功率和适合度的影响却鲜为人知。为了研究这个问题，我们在一项花园实验中测量了黑芥和白菜的生长、开花时间、授粉成功率、花粉、胚珠、花朵、果实和种子的产量，以及所产生后代的质量。这两个物种的总共313株植物被随机分为两个处理组。一组仅接受自然环境水平的UV-B，而另一组接受人工增强的UV-B剂量。在较高的UV-B剂量下，黑芥的适合度下降，而白菜的适合度没有变化。这个结果的一个可能原因是这两个物种对传粉者的相对吸引力发生了变化：在高UV-B剂量下，对黑芥的访花量下降，而对白菜的访花量增加。
