The Use of OJIP Fluorescence Transients to Monitor the Effect of Elevated Ozone on Biomass of Canola Plants
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The effects of elevated ozone (O3) levels (80 ppb and 120 ppb) on photosynthetic efficiency and growth of canola plants were studied in open-top chambers. The chlorophyll a polyphasic fluorescence rise kinetics OJIP, stomatal conductance and Chlorophyll Content Index (CCI) were measured after 15 and 30 days of O3 fumigation, as well as in control plants; biomass measurements were done only after 30 days with and without fumigation. Analysis of the OJIP kinetics by the JIP-test led to the calculation of several photosynthetic parameters and the total Performance Index (PItotal). The decline of PItotal under the 80 ppb O3 treatment was due to a lower density of reaction centres (RC/ABS), while the notable decline under the 120 ppb treatment was found to be due both to a further decline of RC/ABS and to a pronounced lowering of the efficiency with which an electron can move from the reduced intersystem electron acceptors to the PSI end acceptors (δRo). Stomatal conductance was affected by both treatments. Biomass was found to be affected by O3 fumigation (for 30 days), decreasing by 40% at 80 ppb and by more than 70% under 120 ppb. Our findings indicate that biomass decline is due both to the lowering of CCI and the lowering of photosynthetic efficiency parameters. They thus suggest that two simple, non-invasive and rapid methods, namely, the analysis of OJIP fluorescence transients and the measurement of CCI, can be used to screen the effect of elevated O3 on biomass of canola plants.
KeywordsBiomass Canola Chlorophyll a fluorescence JIP-test Open-top chamber Ozone
Absorption (proportional to chlorophyll)
Chlorophyll Content Index
Total Performance Index
Acknowledgements are due to Dr. Merope Tsimilli-Michael (Cyprus) for her helpful of explanations concerning the concepts, application and interpretation of the JIP test and Prof. Suria Ellis (North-West University) for her kind assistance with regard to statistical analysis.
This study was supported by the Cuomo foundation through the partnership with the Intergovernmental Panel on Climate Change (IPCC) scholarship programme and by the Applied Centre for Climate and Earth Systems Science (ACCESS).
Compliance with Ethical Standards
Conflict of Interest
The authors declare that they have no conflict of interest.
The contents of this paper are solely the liability of the authors and under no circumstances may be considered as a reflection of the Cuomo Foundation, IPCC and/or ACCESS.
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