The effects of the interaction of salicylic acid and salinity on the antioxidant defense system and the distribution of some elements in rapeseed (Brassica napus L.) plants

Rapeseed is a valuable oil plant belonging to the Brassicaceae plant family, and considering that today soil salinity is one of the most important limiting issues in agriculture. Therefore, investigating the effect of salicylic acid (as a biological stimulant and agent to improve the antioxidant defense system) on plants under salinity stress conditions in order to reduce the negative effects of salinity stress seems necessary. In this research, the mutual effects of NaCl and salicylic acid on the antioxidant defense system and the distribution of some elements in rapeseed plants of Hyola variety were investigated. For this purpose, ۲۱-day-old seedlings were subjected to concentrations of ۰, ۵۰, and ۱۰۰ mM NaCl and SA with concentrations of ۰ and ۵۰۰ μM SA for ۲ weeks. The obtained results showed that the activity of the antioxidant enzymes superoxide dismutase and catalase, as well as the amount of H۲O۲ in saline treatments in the presence of SA were lower than their values in saline treatments without the presence of SA, which shows a reduction in the level of tension in the presence of SA. Because the decrease in the activity of antioxidant enzymes indicates the decrease in the level of stress and the decrease in the amount of hydrogen peroxide is an indicator of the reduction of membrane damage in stress conditions. Also, an increase in root sodium concentration in salinity treatments was seen in the presence of SA, which could be due to the accumulation of sodium Na in the root and its lack of transfer to the aerial parts, which is a way to deal with stress, and an increase in potassium concentration in roots in saline treatments. , was observed in the presence of SA and since potassium plays an important role in regulating the osmotic potential of cells, this increase can indicate the positive effect of SA in reducing the destructive effects of salt stress. In general, the data show that the presence of SA has increased the resistance of this canola cultivar to salinity, also, the results prove that the application of SA at a concentration of ۵۰۰ μM can limit the negative effects of salinity on the rapeseed Hyola plant.

کلیدواژه ها:

Salinity stress ، Salicylic acid ، Rapeseed ، تنش شوری ، سالیسیلیک اسید ، کلزا