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Bulletin of Botanical Research ›› 2017, Vol. 37 ›› Issue (1): 45-51.doi: 10.7525/j.issn.1673-5102.2017.01.007

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Effects of CO2 Enrichment on Chlorophyll Fluorescence Characteristics of Vallisneria natans

HAN Yan-Qing1,2, LIU Xin2, HU Wei-Ping2, ZHANG Ping-Jiu1, DENG Jian-Cai2, CHENG Ze-Lin3   

  1. 1. College of Territorial Resources and Tourism, Anhui Normal University, Wuhu 241000;
    2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008;
    3. College of Fisheries and life science, Shanghai Ocean University, Shanghai 201306
  • Received:2016-09-29 Online:2017-01-15 Published:2017-03-06
  • Supported by:
    This research is supported by National Natural Science Foundation(41271213, 41230853);State Water Pollution Control and Management Technology Major Projects(2014ZX07101-011);Chinese Academy of Sciences Key Deployment Project(KZZD-EW-10)

Abstract: To explore the effects of elevated atmospheric CO2 on photosynthetic physiology of submerged plant, we studied the effects of high concentrations of CO2 on chlorophyll fluorescence characteristics of Vallisneria natans by measuring the rapid fluorescence induction kinetics curves(OJIP) of the leaves with Plant Efficiency Analyzer and analyzing with JIP-test. The Vj, Mo of V.natans were significantly increased and Sm, ψo and φEo were significantly reduced after 60 days, and the electron transfer diminished capacity of V.natans was decreased compared with the control; the donor side of PSⅡ reaction center was hurt because the Wk was increased; the specific activity parameters ABS/RC, DIo/RC, TRo/RC, DIo/CSo were significantly increased, ETo/RC, REo/RC, ETo/CSo, REo/CSo significantly decreased, and the energy for heat dissipation significant increased lead to the energy of electron transfer and electron transfer chain end were significantly decreased. Compared with the control, the performance parameters Fv/Fm and PIabs were also decreased. Therefore, the long-term high concentrations of CO2 suppressed photosynthetic apparatus state, decreased PSⅡreaction center activity and down regulated photosynthetic function of V.natans, and the V.natans appeared light acclimation.

Key words: Vallisneria natans, CO2 enrichment, PSⅡ, chlorophyll fluorescence

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