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基于光响应机理模型的不同植物光合特性

叶子飘1*,胡文海2,闫小红2,3,段世华2   

  1. (1井冈山大学数理学院, 江西吉安 343009;  2井冈山大学生命科学学院, 江西吉安 343009; 3 南京林业大学生物与环境学院, 南京 210037
  • 出版日期:2016-09-10 发布日期:2016-09-10

Photosynthetic characteristics of different plant species based on a mechanistic model of light-response of photosynthesis.

YE Zi-piao1*, HU Wen-hai2, YAN Xiao-hong2,3, DUAN Shi-hua2#br#   

  1. (1Maths & Physics College, Jinggangshan University, Ji’an 343009, Jiangxi, China; 2School of Life Sciences, Jinggangshan University, Ji’an 343009, Jiangxi, China; 3 College of Biology and Environment, Nanjing Forestry University, Nanjing 210037, China).
  • Online:2016-09-10 Published:2016-09-10

摘要:

为了研究不同植物的光合特性,用LI-6400-40B荧光仪同时测量了葎草(Humulus scandens)、白泡桐(Paulownia fortunei)、龙葵(Solanum nigrum)的电子传递速率和光合作用对光的响应曲线。利用植物光合电子流对光响应和光合作用对光响应的机理模型研究了这3种植物光合特性的差异及其产生的原因。结果表明:葎草的叶绿素含量最低,但其捕光色素分子的本征光能吸收截面最大;白泡桐的叶绿素含量是龙葵的1.2倍,但这两种植物的最大电子传递速率没有差异。产生这种差异的原因是:龙葵的捕光色素分子的本征光能吸收截面要比白泡桐大,而它处于激发态的最小平均寿命要比白泡桐短,且龙葵的电子利用效率要比白泡桐大。此外,捕光色素分子的有效光能吸收截面和处于激发态的捕光色素分子对光响应曲线的差异也有可能影响它们的光合特性。
 

关键词: 碳汇, 物质流分析, 碳捕集与封存, 碳失汇, 石灰

Abstract: To investigate the photosynthetic characteristics of Humulus scandens, Paulownia fortunei and Solanum nigrum, the lightresponse curves of photosynthetic electrons and photosynthesis were measured simultaneously by LI-6400-40B chlorophyll fluorometer. Then the differences in the photosynthetic characteristics of these plants and their courses were studied based on a mechanistic model of lightresponse of photosynthetic electron flow and photosynthesis. The results showed that H. scandens had the lowest chlorophyll content, while its eigenabsorption crosssection was the maximum. The chlorophyll content of P. fortunei was 1.2 times as much as that of S. nigrum, while the electron transport rates of both plants were almost same. The main reasons that determine the differences of photosynthetic characteristics of different plant species are: (1) the eigenabsorption crosssection of lightharvesting pigments of S. nigrum was greater than that of P. fortunei; (2) the minimum average lifetime of photosynthetic pigment molecules in the excited state for S. nigrum was shorter than that of P. fortunei; and (3) the use efficiency of photosynthetic electron of S. nigrum was higher than that of P. fortunei. Moreover, the photosynthetic characteristics of the plants were probably affected by the lightresponse of the effective light absorption cross-section of photosynthetic pigments and the lightresponse of the photosynthetic pigments in the lowest excited state.

Key words: lime, material flow analysis, carbon capture and storage., carbon sink, missing carbon sink