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Odjegba, V. J.
- Physiological Responses of Amaranthus hybridus L. under Salinity Stress
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Authors
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1 Department of Botany, University of Lagos, Akoka, Lago, NG
1 Department of Botany, University of Lagos, Akoka, Lago, NG
Source
Indian Journal of Innovations and Developments, Vol 1, No 10 (2012), Pagination: 742-748Abstract
Soil salinity is an abiotic factor that adversely affects growth and development of plants. To evaluate the physiological responses of Amaranthus hybridus L. under salinity stress, seedlings were exposed to 0, 0.1 and 0.2M NaCl for a period of 6 weeks. Whole plant dry weight, relative water content (RWC), total chlorophyll, lipid peroxidation, protein level and antioxidant enzymes activities were evaluated after the treatment period. The results of the study showed that salinity caused a significant decrease in whole plant dry weight, relative water content, total chlorophyll and protein content while an increase in malondialdehyde content, catalase and ascorbate peroxidase activities were observed. The severity of these effects was concentration dependent. The biomass accumulation of the control plants was 11.67±0.39 g, while those that received 0.1 and 0.2 M NaCl had 9.22±0.28 and 6.94±0.07 g respectively. The increase in malondialdehyde content and antioxidant enzymes activities were indications that salinity stress induced the production of reactive oxygen species (ROS) which caused oxidative damage to macromolecules in living cells.Keywords
Salinity, Absorption, Lipid Peroxidation, Oxidative Stress, Amaranthus hybridusFull Text
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- Oxidative Stress and DNA Damage to Root Cells of Allium Cepa L. by Copper and Lead Induction
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Authors
Affiliations
1 Department of Botany, University of Lagos, Akoka, Lagos, IN
1 Department of Botany, University of Lagos, Akoka, Lagos, IN
Source
Indian Journal of Innovations and Developments, Vol 2, No 3 (2013), Pagination: 828-834Abstract
Toxicity of copper (Cu) and lead (Pb) was evaluated using Allium cepa L. Healthy onion bulbs of relatively equal size were grown for 3 weeks in half-strength Hoagland's solution spiked with copper and lead individually to achieve 0.1, 0.3, and 0.5 mM of the metals. Nutrient solution devoid of these metals served as control. Parameters investigated include ischolar_main length, number of ischolar_mains, lipid peroxidation, and cytogenetic study. The results of this study indicate that these metals consistently inhibited ischolar_main growth, induced chromosomal aberration, and increased lipid peroxidation. The study also revealed that the effects were concentration dependent. It was found in this study that A. cepa was very sensitive to copper and lead, suggesting usage as indicator to monitor pollution by these metals of the environment.Keywords
Heavy Metals, Oxidative Stress, Lipid Peroxidation, Chromosome Aberration, Allium CepaFull Text
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