The effect of growth irradiance on leaf anatomy and photosynthesis in Acer species differing in light demand
The effect of growth irradiance on leaf anatomy and photosynthesis in Acer species differing in light demand
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DOI：
10.1046/j.1365-3040.2002.00881.x
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发表时间：
2002-08-01
影响因子：
7.3
通讯作者：
Terashima, I
中科院分区：
文献类型：
--
作者：
Hanba, YT;Kogami, H;Terashima, I
光照需求的变化是决定森林中树木生长和生存的一个主要因素。三种槭属植物A. rufinerve（需光型）、A. mono（中等）和A. palmatum（耐荫型）的叶片形态和光合作用的光需求与生长辐照度之间存在密切的关系。叶肉厚度和面向细胞间隙的叶绿体表面积（S (c)）随生长辐照度的增加而增加最多。尽管不同物种间光饱和光合作用（A (max)）的增加幅度相似，但水利用效率（WUE）的增加幅度明显高于其他物种，说明水分限制的响应在金合欢叶片对强光的光合适应中起着重要作用。在高辐照下，荆刺羧化位点的CO2分压（C (C)） （130 μ mol mol(-1)）较低，这是由于气孔和内部对CO2扩散的导度较低造成的，这使得荆刺虽然Rubisco含量高，但A （max）的增加最小。遮荫条件下，种间叶片特征差异相对较小。因此，在槭属植物中，光需求的差异与叶片对强光的适应有关，而不是与叶片对弱光的适应有关。
Variation in light demand is a major factor in determining the growth and survival of trees in a forest. There is strong relation between the light-demand and the effect of growth irradiance on leaf morphology and photosynthesis in three Acer species: A. rufinerve (light-demanding), A. mono (intermediate) and A. palmatum (shade-tolerant). The increase in mesophyll thickness and surface area of chloroplasts facing the intercellular airspaces (S (c) ) with growth irradiance was highest in A. rufinerve . Although the increase in light-saturated photosynthesis (A (max) ) was similar among the species, the increase in water use efficiency (WUE) was much higher in A. rufinerve than that in the other species, indicating that the response to water limitation plays an important role in leaf photosynthetic acclimation to high light in A. rufinerve . The low CO2 partial pressure at the carboxylation site (C (c) ) in A. rufinerve (130 mu mol mol(-1) ) at high irradiance was caused by low stomatal and internal conductance to CO2 diffusion, which minimized the increase in A (max) in A. rufinerve despite its high Rubisco content. Under shade conditions, interspecific differences in leaf features were relatively small. Thus, difference in light demand related to leaf acclimation to high light rather than that to low light in the Acer species.