Abstract
Intraspecific variation in six cultivars of clover Trifolium alexandrinum L., (Bundel, Wardan, JHB-146, Saidi, Fahli, and Mescavi) has been studied with ambient and elevated O3 (ambient + 10 ppb O3) in open top chambers. Significant effect of elevated O3 was detected on different morphological, physiological, and biochemical parameters depicting differential response among the test cultivars. Results showed that the magnitude of O3 induced foliar injury symptoms varied in all the cultivars. Ozone significantly depressed photosynthetic rate, stomatal conductance, and photosynthetic efficiency, although variations were cultivar specific. Ozone treatment diminished total biomass of all the cultivars; reduction was highest in Wardan with least O3 resistance followed by Bundel, JHB-146, Saidi, Mescavi, and Fahli. According to the cumulative sensitive index, variations in the sensitivity showed that two cultivars (Wardan and Bundel) were sensitive to elevated O3, while other three cultivars (Fahli, Saidi, and Mescavi) were resistant, and JHB-146 showed intermediate sensitivity. Therefore, the present study supported the selection of sensitive cultivar of clover as a bioindicator for O3 under Indian conditions for the areas experiencing higher concentrations of O3.
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Abbreviations
- APX:
-
Ascorbate peroxidase
- AA:
-
Ascorbic acid
- AOT 40:
-
Accumulated O3 over a threshold concentration of 40 ppb
- CAR:
-
Carotenoids
- CSI:
-
Cumulative sensitive index
- DAG:
-
Days after germination
- H2O2 :
-
Hydrogen peroxide
- LA:
-
Leaf area
- LPO:
-
Lipid peroxidation
- T max :
-
Maximum temperature
- T min :
-
Minimum temperature
- N:
-
Nitrogen
- NFCs:
-
Non-filtered chambers
- NOL:
-
Number of leaves
- OR%:
-
O3 resistance
- OTCs:
-
Open top chambers
- O2 :
-
Oxygen
- ppb:
-
Parts per billion
- POD:
-
Peroxidase
- P:
-
Phosphorus
- Ps:
-
Photosynthetic rate
- PAR:
-
Photosynthetically active radiation
- PH:
-
Plant height
- K:
-
Potassium
- F v/F m :
-
Photosynthetic efficiency
- RGR:
-
Relative growth rate
- gs:
-
Stomatal conductance
- •O2 − :
-
Superoxide ion
- SOD:
-
Superoxide dismutase
- ANOVA:
-
Analysis of variance
- TB:
-
Total biomass
- TCHL:
-
Total chlorophyll
- UV:
-
Ultraviolet
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Acknowledgments
The authors are grateful to the Head, Department of Botany and Co-ordinator, Centre of Advanced Study in Botany, Banaras Hindu University for providing all the necessary laboratory and field facilities and to the University Grants Commission (U.G.C.), Government of India, New Delhi for financial support. We are also thankful to Dr. D. R. Malaviya, Principal Scientist & Head, Seed Technology Division. Indian Grassland & Fodder Research Institute, Jhansi, India for providing the seeds of clover.
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Chaudhary, N., Agrawal, S.B. Intraspecific responses of six Indian clover cultivars under ambient and elevated levels of ozone. Environ Sci Pollut Res 20, 5318–5329 (2013). https://doi.org/10.1007/s11356-013-1517-0
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DOI: https://doi.org/10.1007/s11356-013-1517-0