Effect of polyamine on physiological and agronomic characteristics of soybeans under drought stress

Amani, Mohammad (2020) Effect of polyamine on physiological and agronomic characteristics of soybeans under drought stress. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

Research Aim: Considering the importance of soybean plant in terms of supply of oil and protein required by the country and the existence of drought stress, the use of treatments to improve soybean agronomic and yield characteristics in favorable and unfavorable conditions in terms of water supply is necessary. Therefore, in this study, the effect of treatment of nutrients with polyamine and without polyamine on agronomic and physiological characteristics of soybean under drought stress at the end of the season was investigated. Research method: In order to investigate the effect of nutrients with polyamine and without polyamine on physiological, agronomic and functional indices of soybeans under end-of-season drought stress, a split-plot experiment with a randomized complete block design with 3 replications in Agricultural Research and Training Center and Natural Resources Pars Abad Moghan was performed. Experimental treatments include irrigation at two levels (full irrigation and cessation of irrigation at flowering stage) as the main plot and foliar application at three levels (nutrient compounds containing polyamine, nutrient compounds without polyamine and control) and foliar application time at three levels (vegetative stage, stage Reproductive and application in both vegetative and reproductive stages) as a subplot. In this experiment, physiological traits, yield and yield components and biochemical traits were measured.. Findings: The results showed that drought stress reduced photosynthetic pigments, relative leaf water content and yield-related traits and yield components and increased electrical conductivity of leaked materials. Foliar application of polyamine-free nutrients in drought stress significantly increased chlorophyll concentration, relative leaf water content, increased antioxidant enzyme activity and decreased electrical conductivity, which led to agronomic and physiological characteristics of soybean plants even in adverse water conditions. The flowering stage improves until the seeds are full and as a result, the yield and yield components of soybean plants increase significantly.. Conclusion: It seems that polyamine-deficient nutrients have improved yield and yield components due to providing better nutritional conditions for soybean plants during flowering to seed filling period. However, the application of polyamine along with the nutrients used improved the methodological characteristics and yield of soybeans in both full irrigation and drought stress conditions, even compared to foliar application of nutrients without polyamine, which shows the dual effects of polyamine under full irrigation and stress. It is dry. Therefore, foliar application of soybean plants with polyamine and even nutrients without polyamine in favorable and unfavorable environmental conditions, has a positive and significant effect on physiological, biochemical and agronomic traits measured in soybeans during the growing season until seed filling.

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