PJB-2023-34
Putrescine: Effective Promoter Molecular and Biochemical Processes Associated with Drought Stress Tolerance in Barley (Hordeum vulgare L.)
Serkan Özmen
Abstract
Drought stress is one of the most common environmental stresses that adversely affect plant growth and development and reduce the quality and yield of crops. Putrescine (Put) is one of the polyamines that is a plant growth regulator and responds to abiotic stresses such as drought stress. In this study, the physiological and molecular effects of exogenous Put (10µM) application against drought stress (-6.30 mPa PEG 6000) in barley (Hordeum vulgare cv. Burakbey) were investigated comparatively. It is clearly seen that the 21-day drought stress applied to the barley plant affects the plant negatively by causing changes in plant metabolism in all parameters examined. Exogenous Put application under drought stress had a curative effect on the cell cycle, total protein content, endogenous polyamine content, malondialdehyde (MDA), and ascorbate peroxidase (APX) levels compared to the drought stress plants. Superoxide dismutase (SOD) and catalase (CAT) enzyme levels in the same group increased further after exogenous Put application and formed a response to drought stress. As a result, it has been revealed that the application of exogenous Put in barley increases the amount of endogenous polyamine, which provides greater tolerance to drought due to the increase in antioxidant capacity, promotion of cell division, and increase in protein content.
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