Departamento de Sistemas y Recursos Naturales, Universidad Politécnica de Madrid (UPM), Ciudad Universitaria s/n, 28040, Madrid, Spain.
Facultad de Ciencias Agrarias y Forestales, Universidad Nacional de La Plata, Diagonal 113 Nº 469, 1900, La Plata, Argentina.
Plant Physiol Biochem. 2020 Jul;152:232-242. doi: 10.1016/j.plaphy.2020.05.007. Epub 2020 May 11.
Growing conditions at different tree canopy positions may significantly vary and lead to foliar changes even within the same tree. An assessment of foliar anatomy, including also epidermal features, can help us understand how plants respond to environmental factors. Working with two model tree species (i.e., Quercus petraea and Fagus sylvatica) grown at their southernmost European distribution area in Central Spain, the influence of irradiation and canopy height was examined by sampling lower canopy leaves and comparing them with fully irradiated, top canopy leaves and shaded top canopy leaves grown for months within a bag made of shade netting fabric before they sprouted. At the end of the summer, samples were collected, and several parameters were analysed. The results indicate that SLA (specific leaf area) differences are significant both between species and groups. Leaf and cuticle thickness differed significantly between groups while stomatal densities only between species. Regarding mineral concentrations, differences between species were significant for K, Mn, N and N: P ratios. It is concluded that leaf responses to environmental conditions may be variable both within the same tree and between species.
不同树冠位置的生长条件可能会有显著差异，即使在同一棵树上也会导致叶片发生变化。评估叶片解剖结构，包括表皮特征，可以帮助我们了解植物如何对环境因素做出反应。本研究选择在西班牙中部最南端的欧洲分布区内生长的两个模式树种（即欧洲栓皮栎和欧洲山毛榉），通过采样较低树冠层的叶片，并将其与完全受光的、上层树冠叶片以及在遮阳网袋中生长数月的遮阴上层树冠叶片进行比较，来研究光照和树冠高度的影响。在夏季结束时收集了样本，并对几个参数进行了分析。结果表明，SLA（比叶面积）在种间和组间差异显著。叶片和角质层厚度在组间差异显著，而气孔密度仅在种间差异显著。至于矿质浓度，种间 K、Mn、N 和 N：P 比值差异显著。结论是，叶片对环境条件的反应可能在同一棵树内和不同物种间都存在差异。
