Plant Photosynthesis-Irradiance Curve Responses to Pollution Show Non-Competitive Inhibited Michaelis Kinetics |
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| Authors: | Maozi Lin Zhiwei Wang Lingchao He Kang Xu Dongliang Cheng Genxuan Wang |
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| Institution: | 1. Fuqing Branch of Fujian Normal University, Fuqing, Fujian Province 350300, Republic of China.; 2. College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang Province 310027, Republic of China.; 3. Key Laboratory of Humid Subtropical Eco-geographical Process, Fujian Normal University, Ministry of Education, Fuzhou, Fujian Province 350007, Republic of China.; Texas A&M University at Galveston, UNITED STATES, |
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| Abstract: | Photosynthesis-irradiance (PI) curves are extensively used in field and laboratory research to evaluate the photon-use efficiency of plants. However, most existing models for PI curves focus on the relationship between the photosynthetic rate (Pn) and photosynthetically active radiation (PAR), and do not take account of the influence of environmental factors on the curve. In the present study, we used a new non-competitive inhibited Michaelis-Menten model (NIMM) to predict the co-variation of Pn, PAR, and the relative pollution index (I). We then evaluated the model with published data and our own experimental data. The results indicate that the Pn of plants decreased with increasing I in the environment and, as predicted, were all fitted well by the NIMM model. Therefore, our model provides a robust basis to evaluate and understand the influence of environmental pollution on plant photosynthesis. |
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