Assessment of gamma ray irradiation effects on germination and some morphological characters in tow corn cultivars

ABSTRACT: In this research study, the dose of gamma radiation on seed germination of two cultivars of maize (single cross 500 and single cross 704), and the mechanisms of the dose required to maximize the rate and percentage of germination and increased growth of root and shoot Research central Agricultural Research Laboratory was conducted in Mashhad. The experiment consisted of two corn (single cross 500 and single cross 704) under the influence of gamma radiation (Co-60) with five different dose groups and a control was carried out for 5 days.3900 seeds of two varieties of maize (cv. 500 and SC704) were used. Seed treatment using cobalt-60 gamma radiation was in Omid Hospital Mashhad. In this study, six groups of seeds (zero dose, 100, 200, 400, 600 and 800) were irradiated for 5 days, each day for each group counted 75 seeds were sown in glass dishes. Germinated seeds counted 4 days after placing the dishes in the incubator and this 7 days and until that changes in the number of germinated seeds was found continued. Studied in this experiment were: germination percentage, germination rate, root length, shoot length and shoot diameter.The results showed that the root and shoot of both cultivars at doses of 400 and 600 cGy and was highest in the third and fourth days. Traits also showed significant reduction in the dose of 800. SC 500 varieties of treatments for root length, shoot length and germination showed the superiority of the SC704.