Responses of two cultivars of Trifolium repens L. to ethylene diurea in relation
to ambient ozone |
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Authors: | Shalini Singh Dalbir Kaur S B Agrawal and M Agrawal |
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Institution: | Laboratory of Air Pollution and Global Climate Change, Department of Botany, Banaras Hindu University, Varanasi 221005, India |
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Abstract: | Three ethylene diurea (EDU) concentrations (0, 150 and 300 mg/L) were used to evaluate the negative impact of ozone (O3) on
two cultivars of Trifolium repens L. cv. Vardan and Bundel grown under natural field conditions in a suburban area of Varanasi, India.
Mean O3 concentrations varied from 30.3 to 46.6 g/L during the experimental period. Higher photosynthetic pigments and ascorbic
acid concentrations were noticed in both EDU-treated cultivars over non-EDU-treated ones, but a reverse trend was found for lipid
peroxidation. Growth parameters and biomass also showed increments under EDU treatment of both cultivars. The ratio of variable
fluorescence to maximum fluorescence increased significantly in Vardan but not in Bundel upon EDU treatment. Results revealed
that EDU concentration of 300 mg/L was more e ective to combat the oxidative stress as well as protecting plants from O3 injury
symptoms. The test cultivar Vardan is relatively sensitive to O3, thereby can be used as a bioindicator of O3 pollution in areas having
higher O3 concentrations. Results also indicated that Bundel has more e cient antioxidant defense system than Vardan and hence was
more tolerant to O3 stress. |
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Keywords: | Trifolium repens ozone oxidative stress ascorbic acid photosynthetic pigments |
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