Morphological and biochemical responses of Sorghum bicolor (L.) Moench under drought stress

Abstract Sorghum is an important forage crop, and both quantity quality of this crop are affected by drought stress. Accordingly, in order to investigate the effect stress on morpho-physiological traits, a split-plot experiment was conducted based randomized complete block design with four replicates Isfahan, Iran, during 2017 2018 seasons. Treatments were irrigation regimes levels (control, preventing at pollination, seed milky, doughy stages) three varieties sorghum (Sepideh, Kimia, Payam). The results showed that negatively influenced morphological yield-related traits sorghum, while its positive some quality-related such as total soluble carbohydrate, crude protein, proline contents. According results, prevention stage (representing moderate stress) caused inconsiderable reduction yield. In addition, has relationships between sorghum. Considering together susceptibility (stress index) tolerance (geometric mean product) indices indicated Payam variety more proper be used non-stress conditions. Furthermore, Kimia shown suitable but because having low NDF might suitable.