Comparing the effect of green and synthetic titanium dioxide nanoparticles on improving resistance Early Urbana tomato plant (Solanum lycopersicum Var. Early Urbana) to heavy metal nickel stress

The toxicity of the heavy metal nickel in plants causes oxidative stress and the production of energetic radicals (ROS) such as superoxide (O۲-), hydrogen peroxide (H۲O۲) and hydroxyl (OH-). If the amount of ROS accumulation exceeds the ability of the antioxidant system, the cell will be damaged and the sensitive tomato plant will suffer a reduction in growth. The application of titanium nanoparticles increases the resistance to nickel stress by increasing the antioxidant power and improving plant growth. In this research, the comparative and reciprocal effect of ۵۰ mg/liter of two types of green nanoparticles (GNP; using oregano plant extract) and synthetic (SNP) titanium dioxide with a size of ۱۰ to ۳۰ nm on improving the growth and resistance of tomato. Early Urbana cultivar was studied under the stress of ۱۵۰ µM nickel-II sulfate in the greenhouse environment as a factorial experiment in the form of a completely randomized design. The results showed that the separate application of two green nanoparticles (GNP) and synthetic titanium (SNP) had a significant effect on the improvement of stem fresh weight (۱۶.۳۸ g/plant) and root length growth (۳۰.۰۴ cm), ion leakage (۳۱ ۲.۲%), MDA (۰.۰۸۴ nM), root potassium accumulation (۱.۶۹%) under nickel stress conditions. However, the cross-application of green nanoparticles with the synthetic type led to further improvement of measured traits such as stem magnesium nutrition (۷.۳۴%), stem iron (۲.۷۹%), stem nickel accumulation (۰.۰۲۸%), catalase enzyme activity (۲۹. ۸ enzyme U) and leaf surface (۱۱.۶ cm۲) were treated with ۱۵۰µM nickel toxicity and was able to reduce the toxic effects of nickel stress well. Therefore, in some other traits such as the improvement of stem H۲O۲ accumulation (۴.۶ µM), the separate application of green nanoparticles under nickel stress had a better effect than synthetic titanium nanoparticles. However, the application of green titanium nanoparticles individually or together increased the resistance of plants under nickel stress and is a proposed method compatible with the environment.

کلیدواژه ها:

Nickel ، Nanoparticles ، Oxidative parameters ، Tomato ، Titanium ، تنش نیکل ، دی اکسید تیتانیوم ، شاخص های اکسیداتیو ، گوجه فرنگی ، نانوذرات سبز