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Role Of Ascorbic Acid In Imparting Tolerance To Plants Against Oxidizing Pollutants
[Full Text]
AUTHOR(S)
Priyanka Sharma, Reena Jain, ChirashreeGhosh
KEYWORDS
APTI, Ozone, Ascorbic Acid, Chlorophyll,Azadirachtaindica, Pongamiapinnata.Tolerant.
ABSTRACT
Ascorbic acid is an antioxidant in plants which play important role in activation of many physiological and defense mechanisms. The level of ascorbic acid in plants is determinant of its tolerance against the adverse effect of oxidizing pollutants. The present study tries to relate the variation in ascorbic acid content with the tolerance and sensitivity of two selected plant species viz. Azadirachtaindica and Pongamiapinnata by calculating their Air Pollution Tolerance Index (APTI) during winter season from November to March in the urban city, Delhi, of North India. Moreover, ascorbic acid is also an important part of chloroplast; it protects different components of photosynthetic system from oxidative stress. Thus, to understand the role of ascorbic acid in imparting tolerance to plants against oxidizing pollutants the changes in chlorophyll content of the selected plant species with variation in ambient ozone concentration was analysed. It was found that as per APTI values Azadirachta sp. came under tolerant range with highest ascorbic acid content, whereas, Pongamia sp. was under intermediate range with less ascorbic acid content. It was statistically established, that ozone has no significant relation with chlorophyll content of Azadirachta sp. which has the highest ascorbic acid content. Whereas ambient ozone concentrations showed significant negative relation with the chlorophyll content of Pongamia sp. (p< 0.05). Thus, it was observed that the plants with high ascorbic acid content are tolerant and have greater ability to remediate pollutants.
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