Am J Bot. 1998 Mar;85(3):360.
Much of the ultraviolet-B radiation (UV-B) research on plants has concentrated on vegetative plant parts, and only a small fraction has dealt with the reproductive system. The present study analyzed pollen grains of 34 taxa germinated and grown under two levels of UV-B radiation (187 and 460 mW/m2) or no UV-B (control group). Visible radiation at 260 mmol/m/s was present in all treatments. Taxa included those with binucleate and trinucleate pollen types. We detected differences among species. A significant reduction in pollen germination occurred in only five species. Pollen tubes of >50% of the species showed significant reduction in length. Trinucleate pollen types were more likely to exhibit tube length reduction than the binucleate types. Proportionately more monocotyledonous species were sensitive to UV-B treatment than dicotyledonous species, and proportionately more wild species were sensitive than cultivated species and pollen collected from plants growing in the field were somewhat more sensitive than pollen collected from plants grown in the greenhouse. Species in which pollination occurred earlier in the season were more likely to be susceptible to UV-B radiation than those for which anthesis took place later in the season, suggesting a possible adaptation to UV-B radiation.
植物的大部分紫外线-B 辐射 (UV-B) 研究集中在营养植物部分，只有一小部分涉及生殖系统。本研究分析了在两种紫外线-B 辐射水平（187 和 460 mW/m2）或无紫外线-B（对照组）下萌发和生长的 34 个分类群的花粉粒。所有处理均存在 260 mmol/m/s 的可见辐射。分类群包括双核和三核花粉类型。我们检测到了物种间的差异。只有五个物种的花粉萌发显著减少。超过 50%的物种的花粉管长度显著缩短。三核花粉类型比双核类型更容易出现管长缩短。与双子叶植物相比，单子叶植物对 UV-B 处理更敏感，与栽培种相比，野生种更敏感，与温室中生长的植物收集的花粉相比，从田间生长的植物收集的花粉更敏感。在季节早期授粉的物种比在季节后期开花的物种更容易受到 UV-B 辐射的影响，这表明它们可能适应了 UV-B 辐射。
