Stress analysis of Amaranthus hybridus l. and Llycopersicon esculentum Mill. exposed to sulphur and nitrogen dioxide

Vwioko Dennis Emuejevoke, . and Okoekhian Innocent, . and Ogwu Matthew Chidozie, . Stress analysis of Amaranthus hybridus l. and Llycopersicon esculentum Mill. exposed to sulphur and nitrogen dioxide. pp. 1169-1191. ISSN 1511-3701

The effects of SO2 and NO2 on stress-related enzymes in Amaranthus hybridus AH and Lycopersicon esculentum LE were studied. The plants were exposed to SO2 and NO2 generated by chemical reaction in a chamber for one hour every day for three weeks. After exposure chlorophyll content ascorbic acid catalase proline content superoxide dismutase and peroxidase from leaf samples were assessed. Catalase contents decreased (AH: 84.31 2.56 and LE: 50.52 1.74) in the plants relative to control samples which showed appreciable retention (AH: 98.59 4.70 and LE: 91.84 7.12). Plants showed more reduction in peroxidase due to exposure to NO2 compared to values obtained in plants treated with SO2. Meanwhile lower values of ascorbic acid and chlorophyll contents were obtained in plants exposed to SO2 and NO2 gases. On the other hand proline content increased after exposure to the gases. Morphological disorders such as leaf browning chlorosis and shrinkage of leaves were also noticeable. So it is apparent that plants exposed to elevated SO2 and NO2 gases did not exhibit sufficient capacity to counteract the stress imposed by these gases.

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Abstract

The effects of SO2 and NO2 on stress-related enzymes in Amaranthus hybridus AH and Lycopersicon esculentum LE were studied. The plants were exposed to SO2 and NO2 generated by chemical reaction in a chamber for one hour every day for three weeks. After exposure chlorophyll content ascorbic acid catalase proline content superoxide dismutase and peroxidase from leaf samples were assessed. Catalase contents decreased (AH: 84.31 2.56 and LE: 50.52 1.74) in the plants relative to control samples which showed appreciable retention (AH: 98.59 4.70 and LE: 91.84 7.12). Plants showed more reduction in peroxidase due to exposure to NO2 compared to values obtained in plants treated with SO2. Meanwhile lower values of ascorbic acid and chlorophyll contents were obtained in plants exposed to SO2 and NO2 gases. On the other hand proline content increased after exposure to the gases. Morphological disorders such as leaf browning chlorosis and shrinkage of leaves were also noticeable. So it is apparent that plants exposed to elevated SO2 and NO2 gases did not exhibit sufficient capacity to counteract the stress imposed by these gases.

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Item Type:	Article
AGROVOC Term:	Amaranthus
AGROVOC Term:	Lycopersicon esculentum
AGROVOC Term:	Sulphur
AGROVOC Term:	Nitrogen dioxide
AGROVOC Term:	Catalase
AGROVOC Term:	Air pollution
AGROVOC Term:	Chlorophylls
AGROVOC Term:	Ascorbic acid
AGROVOC Term:	Proline
AGROVOC Term:	Superoxide dismutase
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:29
URI:	http://webagris.upm.edu.my/id/eprint/24808

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