Determination of Drought Stress Indices of Two Varieties Sesame Local of Behbahan and Dashtestan2

Water stress is currently considered the most important and common cause of reduced yield in arid and semi-arid regions. Still, this tension may even occur in areas with high rainfall. Due to its resistance to drought and heat, Sesame is of great importance in developing agriculture in arid and semi-arid regions during summer planting. Sesame, with the scientific name Sesamum indicum L. is crucial in developing agriculture in arid and semi-arid regions during summer planting (Aien, 2013) due to its tolerance to drought stress and heat. According to the results of this study, the KC50662 and Oltan sesame varieties in terms of yield and yield components in normal conditions and stress were in the superior group. The two cultivars with higher stress tolerance index (STI) had higher performance in both conditions. Regression results for the STI index indicated that cultivars with higher STI had more seed weight per capsule and more capsules per plant (Abbasali et al., 2017). The results of one research showed that Olt cultivar with the highest levels of STI and the lowest SSI and TOL as tolerant cultivars were identified in normal condition and moisture stress conditions. The researchers also identified the Sesame Oltan variety as having the highest amount of STI and the least amount of SSI and TOL indices as a drought-tolerant (Molaei et al., 2012). In one study, Darab 14 sesame variety was superior in the normal conditions and moisture stress in terms of tolerance and sensitivity and was introduced as an outstanding cultivar in evaluating MP, TOL, SSI, HARM, and STI indices (Amani et al. 2012). Considering the importance of Sesame as one of the leading products of feed oil supply in Iran, the implementation of low irrigation can be adapted to the occurrence of droughts with water shortages. This study aimed to investigate the effect of drought stress on different levels of drip irrigation and the identification of superior cultivars based on drought stress indices.