Effects of CO2 Enrichment on Chlorophyll Fluorescence Characteristics of Vallisneria natans

doi:10.7525/j.issn.1673-5102.2017.01.007

Abstract

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 V_j, M_o of V.natans were significantly increased and S_m, ψ_o and φ_Eo 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, DI_o/RC, TR_o/RC, DI_o/CS_o were significantly increased, ET_o/RC, RE_o/RC, ET_o/CS_o, RE_o/CS_o 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 F_v/F_m and PI_abs 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

CLC Number:

Q945.11

HAN Yan-Qing, LIU Xin, HU Wei-Ping, ZHANG Ping-Jiu, DENG Jian-Cai, CHENG Ze-Lin. Effects of CO₂ Enrichment on Chlorophyll Fluorescence Characteristics of Vallisneria natans[J]. Bulletin of Botanical Research, 2017, 37(1): 45-51.

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Effects of CO₂ Enrichment on Chlorophyll Fluorescence Characteristics of Vallisneria natans

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