Schäfer Christian, Lüttge Ulrich
Institut für Botanik, Technische Hochschule, Schnittspahnstraße 3, D-6100, Darmstadt, Federal Republic of Germany.
Oecologia. 1988 May;75(4):567-574. doi: 10.1007/BF00776421.
Kalanchoë uniflora was grown in the glasshouse with and without shading. Chlorophyll content, area/FW ratio and specific leaf area were higher in leaves of shaded as compared to unshaded plants. Light saturation curves and continuous gas exchange measurements showed that the apparent quantum yield and the light-saturated photosynthetic rate were higher in shaded plants. Shaded plants had lower "mesophyll resistances" than unshaded plants, indicating that the different photosynthetic capacities reflected different contents of ribulose biphosphate carboxylase-oxygenase. Highlight treatment of plants grown in the shade resulted in a decreased photosynthetic efficiency, showing that these plants were sensitive to photoinhibition. However, dry matter production was higher in unshaded than in shaded plants. Obviously the difference in irradiance between the two growth regimes did more than offset the differences in photosynthetic efficiency. Applying additional nutrients did not alter the effects of high PFDs. The results are discussed in respect to photosynthetic performence and plant distribution in the epiphytic habitat.
将单花伽蓝菜种植在温室中，分为有遮荫和无遮荫两种情况。与未遮荫的植株相比，遮荫植株叶片中的叶绿素含量、面积/鲜重比和比叶面积更高。光饱和曲线和连续气体交换测量表明，遮荫植株的表观量子产率和光饱和光合速率更高。遮荫植株的“叶肉阻力”比未遮荫植株低，这表明不同的光合能力反映了核酮糖二磷酸羧化酶加氧酶含量的差异。对生长在遮荫环境中的植株进行高光处理会导致光合效率降低，这表明这些植株对光抑制敏感。然而，未遮荫植株的干物质产量高于遮荫植株。显然，两种生长条件下的光照差异所产生的影响超过了光合效率差异的影响。施加额外的养分并没有改变高光合有效辐射的影响。针对附生生境中的光合性能和植物分布对结果进行了讨论。
