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چکیده
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Dust storm is currently considered as a usual natural phenomenon that is frequently occurring in arid and semi-arid lands on the earth. West and South of Iran are also influenced by this calamity. This phenomenon like other hazardous events could make harmful effects on the plants. The aim of this study was to investigate the effects of simulated dust storm on some biochemical features of Persian oak (Quercus brantii) such as: chlorophyll pigments, carbohydrates, and proline. About 30 even-aged seedlings (3- years-old) were prepared for the study. The seedlings were treated at three repeated periods on a test chamber by simulated dust storm. Simultaneously, 10 similar seedlings were put in the same chamber at the nearby place with no treatment as control. At the end of each period, some leaves from treated and control seedlings were collected from middle part of the crowns and stored in the freezer for further analyses. The results showed that with increasing dust concentration, the chlorophyll pigments a, b, t and carotenoids were decreased, while the carbohydrates increased. The analyses determined the more significant differences at highest dust concentration. However, no significant difference was observed at proline content that it could be related to the short time of treatment as well as the intensity of dust storm stress. According to the results, it can be stated that in spite of the continuum drought, less precipitation and outbreaking of pests and diseases, dust storm is as a major factor of oak decline. As a result, it necessitates to make proper decision for choosing resistant plant species for reforestation and controlling pollutants resources.
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