Study of physiological and biochemical changes of maize seed(Zea mays l.) in natural and artificial aging conditions

This experiment was done in seed and plant certification and registration institute laboratory in 2015. The treatments were corn seed produced in Karaj and Moghan , seed storing condition in two controlled and Free weather conditions stores also Disinfection and non- Disinfection. The experiment was conducted as factorial based on completely randomized design in three replications. Germination percent of Karaj seeds before accelerated aging test was 92 percent and after 144 hours aging, it reduced 3 percent in controlled storage and it dropped 6 percent in Moghan conditions storage. While similar condition led to a decrease of 18 and 28 percent in Moghan seeds produced. When seeds were stored in controlled storage, indicated 17 percent higher protein content compared to storage in Moghan conditions. Catalase activity of Karaj seeds was higher than Moghan seeds (14%). Seed treatment had significant effect on peroxidase and MDA content, as peroxidase activity in treated seeds was 11 percent higher and MDA content was 8 percent lower than untreated seeds. Karaj seeds in controlled storage had the highest peroxidase activity and the lowest MDA content. So production seed conditions in Moghan was more critical in terms of temperature and humidity than Karaj so the biochemical properties of seeds have been affected. So that Moghan seeds had less storability after storing. On the other hand, seeds in Moghan store subjected to more critical temperature and humidity than controlled condition so more deteriorated.