Abstract

Abstract Nano Technology has widely been considered by most researcher different sciences .In order to evaluate the impact of nanoparticles SiO2 on seed germination characteristics of periwinkle (Catharanthus roseus Don), an experiment was conducted in a completely randomized design with four replications in laboratory horticulture of Zanjan University. Seeds sterilized were placed for 24 hours at 25 ° C, under treatment nanoparticles (10, 20, 30, 40 and 50 % (by immersion)). The results showed SiO2 nanoparticles created significant difference in percentage and rate germination. The maximum rate and percentage of germination was observed in 40 and 50 milligrams per liter nanoparticles. SiO2 nanoparticles although were increased fresh and dry weight and length root and shoot, but this difference was not significant. Key word: periwinkle, germination, percentage germination, fresh weight