Am J Bot. 1998 Jul;85(7):925.
Our knowledge of the effects of increased levels of ultraviolet-B radiation (UV-B) on plant fitness is limited mainly to yield studies in a few crop species. Previous greenhouse and garden studies of Brassica have found greater detrimental effects of UV-B on fitness in gardens than in the greenhouse, suggesting the possibility that additional stresses in the field decrease the ability of Brassica to cope with UV-B. Possible interactions between UV-B and water/nutrient stress in determining plant fitness have rarely, if ever, been studied experimentally. Here we report measurements of female fitness in two species of Brassica in an experiment in which both UV-B and levels of water and nutrients were varied in a 2 x 2 factorial design. Water and nutrient stress reduced female fitness in both species, while UV-B caused fitness reductions in only one of the species. There was evidence for interactions between UV-B and water/nutrient stress for only a few of the traits measured; most traits, including those closely related to fitness, showed no evidence of an interaction.
我们对紫外线-B 辐射（UV-B）水平升高对植物适应性的影响的了解主要局限于少数几种作物的产量研究。先前对 Brassica 的温室和花园研究发现，与温室相比，UV-B 对花园中植物适应性的不利影响更大，这表明在田间的其他压力可能会降低 Brassica 应对 UV-B 的能力。UV-B 和水/养分胁迫之间在确定植物适应性方面的可能相互作用很少（如果有的话）进行过实验研究。在这里，我们报告了在一项实验中两种 Brassica 植物的雌性适应性测量结果，该实验采用 2 x 2 析因设计来改变 UV-B 和水/养分的水平。水和养分胁迫降低了两个物种的雌性适应性，而只有一个物种中的 UV-B 导致适应性降低。只有少数几个被测量的特征表现出 UV-B 和水/养分胁迫之间存在相互作用的证据；大多数特征，包括与适应性密切相关的特征，都没有表现出相互作用的证据。
