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Chinese Journal of Plant Ecology >

2014 , Vol. 38 >Issue 11: 1241 - 1249

DOI: https://doi.org/10.3724/SP.J.1258.2014.00119

A mechanistic model of light-response of photosynthetic electron flow and its application

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  • 1 School of Life Sciences, Jinggangshan University, Ji’an, Jiangxi 343009, China;
    2 Maths & Physics College, Jinggangshan University, Ji’an, Jiangxi 343009, China;
    3 State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
    4 Rice Research Institute of Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China
    5 College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China; and 6 Agricultural College, Jiangxi Agricultural University, Nanchang 330045, China

Received date: 2014-04-16

  Accepted date: 2014-09-02

  Online published: 2014-11-17

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Abstract

Aims Our objectives were to introduce a mechanistic model of light-response of photosynthetic electron flow and to understand how the photosynthetic electron flow respond to light intensity and the characteristics of light-harvesting pigment molecules.Methods Light-responses of photosynthetic electron flow were measured in Lagedium sibiricum, Erigeron annuus and Aster tataricus by using a LI-6400-40B, and the curves were fitted by a mechanistic model of light-response of photosynthetic electron flow. Important findings (1) The mechanistic model of light-response of photosynthetic electron flow not only well described the light-response curves of photosynthetic electron flow in L. sibiricum, E. annuus and A. tataricus, but also obtained some key photosynthetic parameters, e.g. maximum photosynthetic electron flow, saturation irradiance and initial slope of the light-response curve; the fitted photosynthetic parameters were similar to the measured values. (2) The effective light absorption cross-section of light-harvesting pigment molecules quickly decreased with increasing irradiance in L. sibiricum, and showed slowest rate of decrease in E. annuus. (3) The light-harvesting pigment molecules in the lowest excited state increased most rapidly with increasing irradiance in L. sibiricum, and most slowly in E. annuus. In conclusion, compelling evidence indicates that decrease in effective absorption cross-section and increase in the number of light-harvesting pigments in the lowest excited state would reduce light energy absorption.

Key words： effective light absorption cross-section; mechanistic model of light-response; photosynthetic electron flow

Cite this article

YE Zi-Piao,HU Wen-Hai,XIAO Yi-An,FAN Da-Yong,YIN Jian-Hua,DUAN Shi-Hua,YAN Xiao-Hong,HE Li,ZHANG Si-Si . A mechanistic model of light-response of photosynthetic electron flow and its application[J]. Chinese Journal of Plant Ecology, 2014 , 38(11) : 1241 -1249 . DOI: 10.3724/SP.J.1258.2014.00119

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