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作物学报 ›› 2012, Vol. 38 ›› Issue (08): 1452-1459.doi: 10.3724/SP.J.1006.2012.01452

• 耕作栽培·生理生化 • 上一篇    下一篇

散射光和直射光对高粱叶片光合功能的影响

王晓琳1,2，李志强3，姜闯道1,石雷1，邢全1，刘立安1   

  1. 1 中国科学院植物研究所，北京 100093；2 中国科学院研究生院，北京 100049；3 北京市农业职业技术学院，北京 102442
  • 收稿日期:2011-12-28 修回日期:2012-04-20 出版日期:2012-08-12 网络出版日期:2012-06-04
  • 通讯作者: 姜闯道, E-mail: jcdao@ibcas.ac.cn
  • 基金资助:


    本研究由国家自然科学基金项目(30871455)和北京市自然科学基金项目(6122025)资助。

Effects of Diffuse and Direct Lights on Photosynthetic Function in Sorghum Leaf

WANG Xiao-Lin1,2,LI Zhi-Qiang3,JIANG Chuang-Dao1,SHI Lei1,XING Quan1,LIU Li-An1   

  1. 1 Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Beijing Vocational College of Agriculture, Beijing 102442, China
  • Received:2011-12-28 Revised:2012-04-20 Published:2012-08-12 Published online:2012-06-04
  • Contact: 姜闯道, E-mail: jcdao@ibcas.ac.cn

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2568

被引次数

13

摘要： C4等面叶作物背腹侧结构相似并分别暴露在散射光和直射光下。为阐述散射光和直射光对其光合功能的驱动作用，以高粱为材料，研究了散射光和直射光对叶片背腹侧光合功能的影响。结果表明,高粱叶片背腹侧解剖结构相似，其光谱学特性差异很小, 与近轴侧相比，远轴侧的气孔密度、气孔下腔面积、维管束鞘细胞与叶肉细胞接触面积较大; 在相同直射光下近、远轴侧均具有较高的光合速率, 在近轴侧照光同时用PE膜封闭叶片受光侧气孔，观察到远轴侧在叶片自身透射光下能够维持较高的净光合速率；相反，近轴侧在自身透射光下光合速率很低; 自然光照条件下一天内直射光和散射光强度差异很大，大部分时间的散射光强度明显低于远轴侧光补偿点。由此认为，高粱远轴侧光合作用主要由自身透射光驱动，散射光作用很小，该特性是对光环境的适应。这对田间等面叶作物生产管理、生态系统生产力的研究和高光效育种有重要意义。

关键词: 直射光, 散射光, 结构, 光合

Abstract: The effects of direct and diffuse lights on the leaf-side-specific regulation of photosynthesis were studied in sorghum, a typical C4 plant. Leaf morphology and structure were carefully investigated by semithin cross section of sorghum leaves. Leaf absorption, transmittance and reflectance profiles were similar on the adaxial and abaxial leaf surfaces across the light spectrum from 400 to 800 nm, whether light was illuminated via the adaxial or abaxial surface. The photosynthetic light-response curves showed that maximal whole photosynthetic rates were higher when the light entered the leaf via the adaxial surface than the abaxial surface. The changing trend of stomatal conductance was similar with photosynthetic light-response curves. However, the maximal photosynthetic rates were much lower when the light entered the leaf via the abaxial surface than adaxial surface when blocking the stomata of light-oriented side by PE membrane. Theintensity of direct and diffuse lights varied widely in a day, and that of diffuse light was significantly lower than light compensate point (Ic) of abaxial leaf surfaces in sorghum. Consequently, photosynthetic rate of abaxial leaf surface in sorghum should be mainly droved by self-transmitted light but not diffuse light. Differences in stomatal density, substomatic cavity, contacting areas between bundle sheath and mesophyll cells are related to this feature of abaxial leaf surfaces. is the findings of the present study are important for field management, investigation of ecosystem productivity and breeding for high photosynthetic efficiency.

Key words: Direct light, Diffuse light, Leaf structure, Photosynthesis

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