Grant Olga M, Incoll Lynton D, McNeilly Tom
School of Biology, University of Leeds, Leeds LS2 9JT, UK.
School of Biological Sciences, University of Liverpool, Liverpool L69 7ZB, UK.
Funct Plant Biol. 2005 Sep;32(9):817-829. doi: 10.1071/FP05020.
Seeds of Cistus albidus L. plants from three populations that are exposed to differing temperature and precipitation in Almería province of south-east Spain, were collected and grown together in a factorial experiment with two irrigation treatments. The aim was to determine whether populations from different habitats differed when exposed to common conditions, or differed in the plasticity of their response to availability of water. Significant differences in growth of branches and in leaf dimensions were found between treatments, indicating phenotypic plasticity. There was also significant variation between populations in growth of branches and leaf dimensions, with a population from a location that is intermediate in terms of precipitation and temperature showing the greatest growth of branches and production of leaves under the well-watered treatment. This population is from a semi-arid climate, where precipitation is unpredictable, and selection may have occurred to favour rapid growth when water is available. This population had the narrowest leaves under both treatments, and the lowest leaf mass in the well-watered treatment. It also maintained the same mass per leaf under the two treatments, whereas the others showed an increased mass of leaves with increased availability of water. Thus, populations differed both in their manner of allocating resources and their response to availability of water.
采集了西班牙东南部阿尔梅里亚省三个种群的白岩蔷薇植株的种子，这些种群所处环境的温度和降水量不同。将种子放在一个析因实验中共同培育，该实验设有两种灌溉处理方式。目的是确定来自不同栖息地的种群在共同条件下是否存在差异，或者在对水分可利用性的反应可塑性方面是否存在差异。处理之间在枝条生长和叶片尺寸方面存在显著差异，表明存在表型可塑性。种群之间在枝条生长和叶片尺寸方面也存在显著差异，在降水和温度处于中等水平的一个地点的种群，在水分充足的处理条件下枝条生长和叶片产量最大。这个种群来自半干旱气候地区，那里降水不可预测，可能已经发生了选择，以利于在有水时快速生长。在两种处理条件下，这个种群的叶片最窄，在水分充足的处理条件下叶片质量最低。在两种处理条件下，它的单叶质量保持不变，而其他种群则随着水分可利用性的增加叶片质量增加。因此，种群在资源分配方式和对水分可利用性的反应方面都存在差异。
