光合电子流对光响应的机理模型及其应用

doi:10.3724/SP.J.1258.2014.00119

植物生态学报 ›› 2014, Vol. 38 ›› Issue (11): 1241-1249.DOI: 10.3724/SP.J.1258.2014.00119

光合电子流对光响应的机理模型及其应用

叶子飘^1,^2,^*(),胡文海¹,肖宜安¹,樊大勇³,尹建华⁴,段世华¹,闫小红^1,⁵,贺俐^1,⁶,张斯斯¹

¹ 井冈山大学生命科学学院, 江西吉安 343009
² 井冈山大学数理学院, 江西吉安 343009
³ 中国科学院植物研究所植被与环境变化国家重点实验室, 北京 100093
⁴ 江西省农业科学院水稻研究所, 南昌 330200
⁵ 南京林业大学森林资源与环境学院, 南京 210037

收稿日期:2014-04-16 接受日期:2014-09-02 出版日期:2014-04-16 发布日期:2014-11-17
通讯作者: 叶子飘
基金资助:
国家自然科学基金(30960031);江西省自然科学基金(20142BAB20402);江西省重大科技专项计划项目子课题(20114ABF03104)

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

YE Zi-Piao^1,^2,^*(),HU Wen-Hai¹,XIAO Yi-An¹,FAN Da-Yong³,YIN Jian-Hua⁴,DUAN Shi-Hua¹,YAN Xiao-Hong^1,⁵,HE Li^1,⁶,ZHANG Si-Si¹

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:2014-04-16 Accepted:2014-09-02 Online:2014-04-16 Published:2014-11-17
Contact: YE Zi-Piao

摘要/Abstract

摘要：

光合电子流对光响应的机理可以揭示植物光合电子流与光强、植物捕光色素分子物理特性之间的关系。该文讨论了光合电子流对光响应的机理模型的特性以及捕光色素分子的物理性质, 并利用此模型拟合了山莴苣(Lagedium sibiricum)、一年蓬(Erigeron annuus)和紫菀(Aster tataricus)的光合电子流对光响应的曲线。由此模型不仅可以得到植物的最大光合电子流、饱和光强、初始斜率等参数, 还可以获得捕光色素分子有效光能吸收截面和处于最低激发态的捕光色素分子数对光的响应关系。结果表明: 随光强的增加, 山莴苣的捕光色素分子的有效光能吸收截面下降最快, 紫苑的下降速度最慢; 山莴苣处于最低激发态的捕光色素分子数增长速度最快, 紫苑的增长速度最小。捕光色素分子的有效光能吸收截面随光强增加而下降、处于最低激发态的捕光色素分子数随光强增加而增加的特性将减少其光能的吸收和激子的传递, 因而有利于减少强光对植物产生的光伤害。

关键词: 有效光能吸收截面, 光响应机理模型, 光合电子流

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

叶子飘,胡文海,肖宜安,樊大勇,尹建华,段世华,闫小红,贺俐,张斯斯. 光合电子流对光响应的机理模型及其应用. 植物生态学报, 2014, 38(11): 1241-1249. DOI: 10.3724/SP.J.1258.2014.00119

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. Chinese Journal of Plant Ecology, 2014, 38(11): 1241-1249. DOI: 10.3724/SP.J.1258.2014.00119

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链接本文: https://www.plant-ecology.com/CN/10.3724/SP.J.1258.2014.00119

https://www.plant-ecology.com/CN/Y2014/V38/I11/1241

图/表 4

图1 山莴苣(A)、一年蓬(B)和紫菀(C)的光合电子流(J)对光响应的曲线。I, 光强。

Fig. 1 Light-response curves of photosynthetic electron flow (J) in Lagedium sibiricum (A), Erigeron annuus (B) and Aster tataricus (C). I, light intensity.

表1 山莴苣、一年蓬和紫菀的光合参数的拟合值与测量值

Table 1 Fitted and measured values of photosynthetic parameters for Lagedium sibiricum, Erigeron annuus and Aster tataricus

光合参数 Photosynthetic parameter	山莴苣 L. sibiricum		一年蓬 E. annuus		紫菀 A. tataricus
光合参数 Photosynthetic parameter	拟合值 Fitted value	测量值 Measured value	拟合值 Fitted value	测量值 Measured value	拟合值 Fitted value	测量值 Measured value
初始斜率 Initial slope (μmol electrons·μmol photons^-1)	0.350 ± 0.010	-	0.347 ± 0.007	-	0.326 ± 0.001	-
饱和光强 Maximum irradiance (μmol photons·m^-2·s^-1)	1 668.15 ± 98.45	≈1 600	1 320.76 ± 43.27	≈1 300	1 971.62 ± 131.97	≈2 000
最大光合电子流 Maximum photosynthetic electron flow (μmol electrons·m^-2·s^-1)	118.17 ± 75.60	≈120	153.46 ± 4.47	≈155	203.62 ± 7.45	≈205
决定系数 Coefficient of determination (R²)	0.999 4 ± 0.001 0	-	0.999 4 ± 0.000 9	-	0.997 7 ± 0.000 5	-

图2 山莴苣(A)、一年蓬(B)和紫菀(C)的捕光色素分子有效光能吸收截面与本征光能吸收截面之比(σ′ik/σik)对光响应的曲线。I, 光强。

Fig. 2 Light-response curves of the ratio of the effective light absorption cross-section and eign-absorption cross-section (σ′ik/σik) versus I for Lagedium sibiricum (A), Erigeron annuus (B) and Aster tataricus (C). I, light intensity.

图3 山莴苣(A)、一年蓬(B)和紫菀(C)处于最低激发态的捕光色素分子与总捕光色素分子数之比(Nk/N0)对光响应的曲线。I, 光强。

Fig. 3 Light-response curves of the ratio of photosynthetic pigment numbers in the lowest excited state and the photosynthetic pigment numbers in the ground state (Nk/N0) versus I for Lagedium sibiricum (A), Erigeron annuus (B) and Aster tataricus (C). I, light intensity.

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光合电子流对光响应的机理模型及其应用

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

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