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چکیده
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Drought is one of the most important growth-limiting factors that greatly impacts the quality and quantity of plants. On the other hand, the increase of lands exposed to drought and the lack of sufficient access to water resources have focused a lot of attention on drought-related issues[1]. In the present study, A factorial experiment was conducted based on a completely randomized design in three replications to investigate the effect of salicylic acid and silicon on some morphological and physiological indicators of Srophularia striata L. drought stress conditions. For this purpose, plants were exposed to salicylic acid (SA) treatments at two levels (0 and 100 PPM), silicon (Si) at two levels (0 and 1 g/L) and drought stress at two levels (100 and 50 percent of agricultural capacity) in greenhouse conditions [2-3].Four weeks after applying the treatments, the morphological and physiological indicators of the plants were checked. The results of data analysis showed that drought caused a decrease in growth factors (stem length and root length), the content of Photosynthetic pigments, and carotenoid compared to the control samples. Treatment of plants with silicon and salicylic acid reduced the effects of drought stress and increased root length and the content of photosynthetic pigments. In the present study, the simultaneous application of salicylic acid and silicon increased the content of chlorophyll b and carotenoid content compared to treatments exposed to drought, confirming the role of silicon and salicylic acid in reducing osmotic tension.
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