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Proceedings of the International Academy of Ecology and Environmental Sciences, 2015, 5(1): 16-24
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Article

Experimental effects of sand-dust storm on tolerance index, percentage phototoxicity and chlorophyll a fluorescence of Vigna radiata L.

M. Alavi1, Mozafar Sharifi2
1Razi University Centre for Environmental Studies, Department of Biology, Baghabrisham 67149, Kermanshah, Iran
2Laboratory of plant physiology, Department of Biology, Faculty of Science, Razi University, Kermanshah, Iran

Received 23 October 2014;Accepted 2 December 2014;Published online 1 March 2015
IAEES

Abstract
In arid and semi-arid parts of the world excessive mineral aerosol carried by air parcels is a common climatic incident with well-known environmental side effects. In this way, we studied the role of sand-dust accumulation on various aspects of productivity of Vigna radiata L. including dry mass (DM), chlorophyll (Chl) a, b, Chlorophyll a fluorescence (effective quantum yield of PSII photochemistry (§¶PSII), maximal quantum yield of PSII photochemistry (Fv/Fm) and electron transport rate (ETR)). V. radiata was exposed to a gradient of dust concentrations in a dust chamber (0.5 (T1), 1(T2) and 1.5 g/m3 (T3)) simulated by a dust generator for a period of 60 days. Results of this experiment indicate that DM and Chl content of shoot are negatively correlated with the intensity of the dust exposure. Exposure of V. radiata to dust compared with the control was caused 5% (T1), 14% (T2) and 27% (T3) reduction in leaf DM (pˇÜ0.05, ANOVA). Also, exposure to the dust induced a significant (pˇÜ0.05) reduction in the Total Chl content in (T3) 25%. Also, we showed that §¶PSII, ETR and Fv/Fm were affected by increasing of the dust concentrations. Exposure to the dust resulted in a significant reduction in ETR of 15%, 22%, and 43%.

Keywords sand and dust storm;Vigna radiata L;effective quantum yield of PSII photochemistry (§¶PSII)..


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