Abolfazl Ranjbari Fordoei - Associate Professor, Department of Desert science, Faculty of Natural Resources and Earth Sciences, Kashan University, Iran
Somayeh Heydarnezhad - Ph.D student, Department of Desert science, Faculty of Natural Resources and Earth Sciences, Kashan University, Iran
Ehsan Zandi Esfahan - Assistant professor Research Institute of Forests and Rangelands - Research Institute of Forests and Rangelands, Iran

Smirnovia iranica, a native valuable woody species from Fabaceae, is an adaptable plant of central sandy areas of Iran. Changes in chlorophyll fluorescence and photosynthetic pigments characteristics were analyzed in the course of dust accumulation including DDM, DDJn and DDJl, respectively. The results obtained from analysis of variance indicated that there was a significant difference among different dust loading months of S. iranica in terms of the mentioned characteristics.

dust; electron transport rate; photosynthetic apparatus; thermal dissipation; pigment