Establishing Correlation Between Abiotic Stress and Isoprene Emission of Selected Plant Species
The atmospheric hydrocarbon budget influenced by a vast range of volatile organic compounds (VOCs) is both anthropogenic and biogenic in origin. Evolution of plant VOCs is a complex process affected by interactions of plants with biotic and abiotic factors in constantly changing environment but their functional role is still a matter of speculation. Isoprene (2-methyl 1,3-butadiene), a five-carbon hydrocarbon, is emitted from the leaves of many plant species. In the present study, isoprene emission potential of two urban plant species (Dalbergia sissoo and Nerium oleander) were measured using branch enclosure method at different selected sites on the basis of proximity to traffic density. In order to find out the dependence of isoprene emission with abiotic factors (temperature and photosynthetic active radiation PAR), regression analysis has been performed. In the case of Dalbergia sp. high temperature and PAR promote high isoprene emission during summer months. Thus, positive linear relationship gives the best fit between temperature, PAR, and isoprene emission rate during summer season as compared to other seasons, whereas in the case of Nerium sp., no such appropriate relationship was obtained. The study concludes that Dalbergia sissoo comes under high isoprene emission category, while Nerium oleander comes under BDL (below detection limit) variety. For any greenbelt development program, it is very important to select the type of plant species to be planted. The present small study reflects that Nerium oleander should be planted in the outskirts of selected areas and that planting of Dalbergia sissoo should be done on low scale so that the air remains clean and indirect production of tropospheric ozone, aerosol production will be minimized.
KeywordsIsoprene Temperature PAR Roadside VOCs and air quality
The authors pay sincere thanks to Dr. Ajay, Senior Technical Assistant, Advanced Instrumentation Research Facility (AIRF), Jawaharlal Nehru University (JNU), New Delhi for analysis of isoprene samples in GC-FID. The authors are also highly grateful to Council for Scientific and Industrial Research (CSIR) for awarding a Senior Research Fellowship (SRF).
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