Centre for Legumes in Mediterranean Agriculture, M080, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
Tree Physiol. 2010 Jun;30(6):741-7. doi: 10.1093/treephys/tpq029. Epub 2010 May 12.
One-year-old sun leaves of 60 species of Eucalyptus were collected in August 2005 at an arboretum in South Australia with a mean annual rainfall of 427 mm, and 14 of the same species were sampled at an arboretum in Western Australia with a mean annual rainfall of 216 mm. We determined the genetic and phenotypic variation in carbon isotope composition (delta13C), specific leaf area (SLA) and nitrogen content per unit area of the species at each site. There were very significant (P < 0.001) differences in delta13C among the species at both sites. The mean delta13C of the 60 species at the wetter site was -27.6 per thousand (from -25.8 per thousand in Eucalyptus youngiana to -29.9 per thousand in Eucalyptus salicola) and of the 14 species at the drier site was -25.3 per thousand (from -23.7 per thousand in Eucalyptus ravida to -27.3 per thousand in Eucalyptus ewartiana). Of the 14 species common to both sites, four species had similar values of delta13C at the two sites despite the differences in rainfall, whereas in others the values of delta13C were significantly (P < 0.001) lower (more negative) at the wet than at the dry site. The SLA and nitrogen content per unit leaf area also differed significantly among the species (P < 0.001), but there was not a common relationship between delta13C and SLA or between delta13C and nitrogen content at the two sites. The strong species by environment interaction resulted from some species demonstrating phenotypic plasticity for delta13C, while others were inherently stable across environments.
2005 年 8 月，在南澳大利亚的一个植物园中收集了 60 种桉树的一年生太阳叶，该植物园的年平均降雨量为 427 毫米，而在西澳大利亚的一个植物园中收集了 14 种相同的桉树，该植物园的年平均降雨量为 216 毫米。我们确定了每个地点的物种的碳同位素组成（δ13C）、比叶面积（SLA）和单位面积氮含量的遗传和表型变异。在两个地点，物种之间的 δ13C 差异非常显著（P < 0.001）。较湿润地点的 60 种桉树的平均 δ13C 为-27.6‰（从 Eucalyptus youngiana 的-25.8‰到 Eucalyptus salicola 的-29.9‰），较干燥地点的 14 种桉树的平均 δ13C 为-25.3‰（从 Eucalyptus ravida 的-23.7‰到 Eucalyptus ewartiana 的-27.3‰）。在两个地点都有的 14 个物种中，有 4 个物种的 δ13C 值在两个地点相似，尽管降雨量不同，但在其他物种中，δ13C 值在较湿润的地点显著（P < 0.001）较低（更负）。比叶面积和单位叶面积的氮含量也在物种之间存在显著差异（P < 0.001），但在两个地点，δ13C 与 SLA 或 δ13C 与氮含量之间没有共同关系。强烈的物种与环境相互作用是由于一些物种表现出对 δ13C 的表型可塑性，而其他物种在不同环境中固有稳定。
