Amelioration of salinity stress by spraying of SiO2-NPs in miniature garden rose (Rosa chinensis Jacq.)

In order to investigate the effects of nanosilicon in salinity stress amelioration in miniature garden rose 'Sanaz' a factorial experiment as a completely randomized design were done with three replications at greenhouse of University of Maragheh in 1399. At the present study for improving in quantitative, qualitative and biochemical traits of miniature garden roses under salt stress (0, 25 and 50 mM NaCl), SiO2-NPs spray were used at different levels (0, 50, 100, 150 and 200 mg L-1). Results showed that all measured traits were decreased severely at 50 mM salinity compared to controls and the least amount of each parameter were recorded at 50 mM level of salinity. While SiO2-NPs spray at 50 mM salinity caused to preserve chlorophyll index and led to increase in the number of plant leaves (62.4%), maximum florescence (55.4%) and variable florescence (more than 3 folded). Also, SiO2-NPs spray decreased the minimum florescence (44%) at 50 mM salinity. Nanosilicon by stimulating growth and increasing in the activity of the antioxidant enzymes resulted in a decreased lipid peroxidation, malondialdehyde amount and, subsequently decreased oxidative stress in plant cells. Spray of nanosilicon under salinity stress, increased the amount of proline and decreased the oxidative damage to the protein. It seems that according to the present results foliar application of SiO2-NPs especially at 200 mg L-1 under salinity stress can be recommended in garden roses.