Abstract
In order to study the effect of drought stress and nitrogen levels on antioxidant enzyme proline and yield of Cassia Angustifolia, an experiment was conducted in Agricultural Research Center, University of Zabol in 2010. Field experiment was carried out as split plot with completely randomized block design with 4 replications. Drought stress was set as the main factor with five levels (75, 70, 65, 60 and 55% field capacity), and nitrogen levels was 0, 100 and 150 kg/ha. Drought stress decreased seed and leaf yield, increased proline and glutathione reductase (GR) activity and changed catalase (CAT), superoxide dismutase (SOD) and glutathione peroxidase (GPX) activities. Also, nitrogen fertilizer enhanced proline content, antioxidant enzymes activities and quantity yield. Key words: Drought stress, antioxidant enzyme, proline, nitrogen, yield.
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