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Odjegba, Victor Johwo
- Exogenous Salicylic Acid Alleviates Arsenic Toxicity in Arabidopsis thaliana
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Authors
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1 Department of Botany, University of Lagos, Akoka, Lagos, NG
1 Department of Botany, University of Lagos, Akoka, Lagos, NG
Source
Indian Journal of Innovations and Developments, Vol 1, No 7 (2012), Pagination: 515-522Abstract
The present study investigated the possible protective role of salicylic acid (SA) against arsenic toxicity in Arabidopsis thaliana. Seedlings were raised from seeds in plastic containers filled with commercial propagation medium and were divided into two groups. Half of the seedlings were treated with 250 μM salicylic acid for 2 weeks, after which both groups were exposed to 100 μM arsenic for 2 weeks. Metabolic parameters representative of oxidative damage and antioxidant activity were evaluated after the treatments. The result showed that arsenic caused a decrease in plant biomass, chlorophyll content and a significant increase in lipid peroxidation, and activities of catalase, ascorbate peroxidase and superoxide dismutase in seedlings that were not pretreated with SA. The toxic effects of arsenic were however alleviated by the exogenously applied SA thereby underscoring the beneficial role of this signal molecule in mediating defense response in plants under stress.Keywords
Antioxidant Enzyme, Metals, Oxidative Stress, Signal Molecule, Pollution, EnvironmentFull Text
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- Responses of Rhizophora Mangle to Simulated Crude Oil Pollution
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Authors
Affiliations
1 Department of Botany, University of Lagos,Akoka, Lagos, NG
1 Department of Botany, University of Lagos,Akoka, Lagos, NG
Source
Indian Journal of Innovations and Developments, Vol 2, No 4 (2013), Pagination: 839-845Abstract
Physiological and biochemical responses induced by crude oil stress were investigated in pot-grown seedlings of the mangrove, Rhizophora mangle. Plants were grown for 4 weeks in soils amended with Bonny light crude oil to achieve 0, 1, 3, and 5 % v/w, oil/soil concentrations. Growth, physiological, biochemical, as well as metabolic parameters representative of oxidative stress and enzyme activities were measured at the end of the treatment period. It was observed that crude oil treatments resulted in low biomass accumulation, relative water content, and chlorophyll level. The treatments however led to a significant increase in lipid peroxidation, catalase, and ascorbate peroxidase activities. It was concluded that R. mangle is among the plant species in the mangrove ecosystem that are susceptible to crude oil toxicity.Keywords
Rhizophora Mangle, Crude Oil, Environment, Pollution, EcosystemFull Text
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