Leaf anatomy as a constraint for photosynthetic acclimation: differential responses in leaf anatomy to increasing growth irradiance among three deciduous trees
Leaf anatomy as a constraint for photosynthetic acclimation: differential responses in leaf anatomy to increasing growth irradiance among three deciduous trees
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DOI：
10.1111/j.1365-3040.2005.01344.x
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发表时间：
2005-07-01
影响因子：
7.3
通讯作者：
Hirose, T
中科院分区：
文献类型：
--
作者：
Oguchi, R;Hikosaka, K;Hirose, T
以白桦（Betula ermanii Cham）为研究材料，研究了白桦成熟叶片在从低到高生长辐照度转换过程中解剖和光合特性的种间差异。宏碁（Acer）的rufinerve Sieb。调查。在温带落叶林中分布于不同演替阶段的油毡（Fagus crenatata Blume）。低辐照度向高辐照度的转换显著提高了马尾草和金翅草单位叶面积光合作用的光饱和速率（P-max），而绿皮草则没有。在低辐照条件下生长的黑麦草叶片相对较厚，叶肉细胞表面有空隙，没有叶绿体或其他细胞器占据。转移到高辐照后，叶绿体随着P-max增大而填充空间，而叶片厚度没有增加。叶片叶肉细胞表面积和叶片厚度具有可塑性，在高辐照条件下增加，叶绿体数量增加，P-max增加。另一方面，绿皮菊的叶肉细胞表面很少被叶绿体占据，叶片的解剖结构也没有发生变化。在所有物种中，P-max在不同的生长辐照度下与暴露叶肉表面附近的叶绿体表面积密切相关。只有叶绿体体积增大时，P-max才会增加。我们得出结论，光驯化势主要取决于叶绿体扩张的未占用细胞表面的有效性，以及叶肉的可塑性，这使得其表面积增加。
Interspecific variation in the response to transfer from low to high growth irradiance with respect to anatomical and photosynthetic characteristics was studied in mature leaves of three tree species, Betula ermanii Cham., Acer rufinerve Sieb. et Zucc. and Fagus crenata Blume, which occur in different successional stages in temperate deciduous forests. Transfer from low to high irradiance increased the light-saturated rate of photosynthesis per unit leaf area (P-max) significantly in B. ermanii and A. rufinerve, but not in F. crenata. Leaves of B. ermanii grown at low irradiance were relatively thick and had vacant spaces along the mesophyll cell surfaces which was not occupied by chloroplasts or other organelles. After transfer to high irradiance, chloroplasts enlarged to fill the space along with P-max without an increase in leaf thickness. Leaves of A. rufinerve were plastic in mesophyll cell surface area and in leaf thickness, both of which increased after the transfer to high irradiance, along with an increase in the amount of chloroplasts and in P-max. On the other hand, F. crenata had little mesophyll cell surface unoccupied by chloroplasts and leaf anatomy was not changed after the transfer. In all species, P-max was strongly correlated with chloroplast surface area adjacent to the exposed mesophyll surface across different growth irradiances. An increase in P-max was observed only when chloroplast volume also increased. We conclude that light acclimation potential is primarily determined by the availability of unoccupied cell surface into which chloroplasts expand, as well as by the plasticity of the mesophyll that allows an increase in its surface area.