بررسي پرتودهي گاما بر جوانه زني و برخي خصوصيات مورفولوژيكي دو رقم كلزا

Assesment of gamma ray irradiation effects on germination and some morphological characters in two rapeseed (Brassica napus L.) cultivars

In order to determine the effect of different dosages of gamma ray radiation (500, 700, 900, 1100, 1300 gry) on germination and morphological characters of two rapeseed cultivars (PF, RGS003) a field experiment was conducted at Sari Agricultural Research Station of University of Mazandaran, for two consecutive years of 2006-2007. The seeds were irradiated with gamma rays in Nuclear Research Center for Agriculture and Medicine Karaj, Iran. The experiment was conducted in a randomized complete block design. The traits of study were number of secondary branches, plant height, number of pod in primary branches, number of pod in secondary branches, pod length and 1000 grain weight. Statistical analysis showed a significant difference among the traits of study. The maximum relative coefficient of variation, the most expansive amplitude of variation and heighest variance were obtained among plants derived from Pf cultivar. These results showed that there have been more interaction between Pf cultivar and gamma rays. In the most cases, plant height was reduced as compared with the control. Pod length and 1000 grain weight of both cultivars were increased as a result of gamma ray irradiation. Among the all studied traits, number of pod in secondary branches of both cultivars exhibited maximum coefficient of variation. So, these traits should be utilized in canola breeding program.