PJB-2019-95
Changes in pigment levels and the activity of antioxidant enzymes due to the use of Thiobacillus and Sulfur in bean cultivars (Phaseolus vulgaris L.) under water deficit stress conditions
Hossien Kheiri Estiar
Abstract
In order to investigate the effect of sulfur and Thiobacillus on bean cultivars under water deficit stress conditions in the spring of 2017, a factorial research was conducted based on a Randomized Complete Block Design with three replications at Research Farm of Islamic Azad University, Tabriz Branch, Iran. In this research, three cultivars of beans (Dorsa, Akhtar and Sadri), four levels of fertilizers (control, sulfur fertilizer for 300 kg/ha, Thiobacillus, sulfur fertilizer + Thiobacillus) and water deficit stress (control, water deficit stress in flowering time and pod setting) were studied. The results showed that there was a significant difference between bean cultivars, fertilizer levels and water deficit stages. Comparison of the mean of cross impacts showed that by applying water deficit stress, the amount of hydrogen peroxide was increased, which resulted in oxidative stress. Also, the amount of photosynthetic pigments and plant yield decreased, where these negative effects were decreased by the presence of Thiobacillus, especially with sulfur, due to the positive effect on the synthesis of photosynthetic pigments and antioxidant activity. Consequently, due to the yield of the product, the tolerance of cultivars to water deficit stress increased, and it can be said that the application of different levels of Thiobacillus, along with sulfur fertilizer, especially in alkaline soils, can affect the amount of bean cultivars tolerance against water deficit stress.
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