Catoni Rosangela, Bracco Francesco, Granata Mirko U
Department of Earth and Environmental Sciences, University of Pavia, Via S. Epifanio 14, 27100 Pavia, Italy.
Physiol Mol Biol Plants. 2020 Feb;26(2):261-270. doi: 10.1007/s12298-019-00746-5. Epub 2020 Jan 17.
Mesophyll conductance ( ) has received over time much less attention than stomatal conductance ( ), although it affects leaf photosynthesis to about the same extent as stomatal conductance does. The objective of this study was to analyze the trend in five understory herbaceous species growing in a close-canopy forest in the north-west of Italy. In particular, three of analyzed species were monocots: Lam., Scop., and P. Beauv and the others dicots species: L., and Ced. The results showed, on one hand, the absence of correlation between and the considered environmental variables in the forest understory (i.e. air temperature, photosynthetic photon flux density and carbon dioxide concentration). Moreover, we carried out a principal component analysis considering all the analyzed morphological and physiological variables for the five species. The following correlation between the first component, related to the leaf mass per unit of leaf area and the leaf tissue density, and seem to suggest a key role of the leaf structural features in determining variations across the five species.
叶肉导度（ ）长期以来受到的关注远少于气孔导度（ ），尽管它对叶片光合作用的影响程度与气孔导度大致相同。本研究的目的是分析意大利西北部一个郁闭森林中生长的五种林下草本植物的叶肉导度趋势。具体而言，分析的三种物种为单子叶植物： 属、 属和 属，另外两种为双子叶植物： 属和 属。结果表明，一方面，叶肉导度与林下森林中考虑的环境变量（即气温、光合有效辐射通量密度和二氧化碳浓度）之间不存在相关性。此外，我们对这五个物种的所有分析形态和生理变量进行了主成分分析。与单位叶面积叶质量和叶组织密度相关的第一成分与叶肉导度之间的以下相关性似乎表明叶结构特征在决定这五个物种叶肉导度变化方面起着关键作用。
