Leaf anatomy and light acclimation in woody seedlings after gap formation in a cool-temperate deciduous forest
Leaf anatomy and light acclimation in woody seedlings after gap formation in a cool-temperate deciduous forest
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DOI：
10.1007/s00442-006-0485-1
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发表时间：
2006-07
期刊：
影响因子：
2.7
通讯作者：
R. Oguchi;R. Oguchi;K. Hikosaka;T. Hiura;T. Hirose
中科院分区：
文献类型：
--
作者：
R. Oguchi;R. Oguchi;K. Hikosaka;T. Hiura;T. Hirose
从解剖学和光合作用特性方面研究了天然寒温性落叶林树苗充分展开的叶片对林隙形成的光合作用。研究采用了8种不同功能群的木本植物：冠层中期树种(刺杉和木兰)、演替后期树冠树种(皱叶枫和单叶枫)、亚冠层树种(枫树和毛白蜡树)和藤本植物(绣球五味子和绣球叶柄)。除藤本植物外，其余6种植物的光饱和光合作用速率(Pmax)在林隙形成后显著增加。树荫下的叶子。Pictus、倒卵杆菌M.obovata.在叶肉细胞中，叶肉细胞沿细胞壁有空隙，没有叶绿体。空隙形成后，通过增加叶绿体体积来填补空隙，进而增加Pmax。在两个种中，面对细胞间隙的叶肉细胞面积的增加使成熟后的叶片增加了Pmax。这两个藤本植物并没有显著改变它们的解剖特征。尽管不同物种对光增强的反应和适应机制不同，但单位叶面积叶绿体面对细胞间隙的面积的增加是Pmax增加的主要原因，说明了叶片解剖在提高Pmax方面的重要性。
The photosynthetic light acclimation of fully expanded leaves of tree seedlings in response to gap formation was studied with respect to anatomical and photosynthetic characteristics in a natural cool-temperate deciduous forest. Eight woody species of different functional groups were used; two species each from mid-successional canopy species (Kalopanax pictusandMagnolia obovata), from late-successional canopy species (Quercus crispulaandAcer mono), from sub-canopy species (Acer japonicumandFraxinus lanuginosa) and from vine species (Schizophragma hydrangeoidesandHydrangea petiolaris). The light-saturated rate of photosynthesis (Pmax) increased significantly after gap formation in six species other than vine species. Shade leaves ofK. pictus,M. obovataandQ. crispulahad vacant spaces along cell walls in mesophyll cells, where chloroplasts were absent. The vacant space was filled after the gap formation by increased chloroplast volume, which in turn increasedPmax. In twoAcerspecies, an increase in the area of mesophyll cells facing the intercellular space enabled the leaves to increasePmaxafter maturation. The two vine species did not significantly change their anatomical traits. Although the response and the mechanism of acclimation to light improvement varied from species to species, the increase in the area of chloroplast surface facing the intercellular space per unit leaf area accounted for most of the increase inPmax, demonstrating the importance of leaf anatomy in increasingPmax.