effects gamma irradiation on yield and yield components of rapeseed (brassica napus)

in order to induce of genetic variation and selection of genotypes with desirable traits, seeds of three varieties of rapeseed sarigol (pf), rgs003 and zarfam were treated with different doses of gamma ray 500, 700 and 900 gy. to confirm the stability of the induced genetic traits, 66 mutant lines from m4 generation were studied in a randomized complete block design with three replications. twenty-two selected lines of m5 generation were evaluated of traits such as height, number of siliqua per plant, number of seeds per siliqua, mean siliqua length, seed 1000 weight and yield. the results of analysis variance that that there are showed significant differences the lines in all the traits studied. the highest coefficient of variation was obtained for the number of siliqua per branch (29/57 percent). trait mean comparison of experiment lines with control showed that siliqua length, seed 1000 weight and yield was significantly higher than the control varieties in zar-16 and zar-20 mutant lines. because of these lines had not different with control varieties for the other traits were considered as superior lines.key words: rapeseed, induction of genetic diversity, gamma rays and mutant line