Abstract
The effects of ambient O3 at two different levels of nitrogen, phosphorus, and potassium, (recommended and 1.5 times the recommended NPK) on three tropical varieties of mustard (Brassica campestris L. var. Kranti, Aashirwad and Vardan) were explored to unravel the mechanism of protection under higher NPK level at a rural experimental site using open top chambers. Ambient O3 concentrations ranged from 27.7 to 59.04 ppb. Lipid peroxidation, antioxidative enzymes, and metabolites were higher, whereas photosynthetic pigments and protein were lower in all the varieties of mustard grown in non-filtered chambers than in filtered chambers. The magnitude of response varied with varieties, NPK levels and ages. Vardan showed a maximum stimulation in the antioxidative defense system, thus efficient scavenging of ROS produced by O3 and consequently conferred greater tolerance in terms of least reductions in pigments and protein as compared to Kranti and Aashirwad. The antioxidant defense system was not stimulated in response to 1.5 times the recommended NPK, but higher levels of pigments and protein were maintained compared to the recommended NPK under ambient O3 levels.
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Abbreviations
- OTCs:
-
Open top chambers
- NFCs:
-
Non-filtered chambers
- FCs:
-
Filtered chambers
- OPs:
-
Open plots
- O3 :
-
Ozone
- ppb:
-
Parts per billion
- RNPK:
-
Recommended NPK
- 1.5 RNPK:
-
1.5 times recommended NPK
- APX:
-
Ascorbate peroxidase
- SOD:
-
Superoxide dismutase
- POD:
-
Peroxidase
- MDA:
-
Malondialdehyde
- LPO:
-
Lipid peroxidation
- AsA:
-
Ascorbic acid
- ROS:
-
Reactive oxygen species
- DAG:
-
Days after germination
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Acknowledgment
The authors are thankful to the Department of Science and Technology, Government of India, New Delhi for providing financial support to the work.
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Singh, P., Agrawal, M. & Agrawal, S.B. Differences in Ozone Sensitivity at Different NPK Levels of Three Tropical Varieties of Mustard (Brassica campestris L.): Photosynthetic Pigments, Metabolites, and Antioxidants. Water Air Soil Pollut 214, 435–450 (2011). https://doi.org/10.1007/s11270-010-0434-9
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DOI: https://doi.org/10.1007/s11270-010-0434-9