Different doses(0～200 Gy) of 60Co-γ rays were used to irradiate the seedlings and seeds of maize inbred lines,then the growth of the contemporary and the next generations were investigated.The results showed that the appropriate irradiation dose for maize seedlings was 75～100 Gy,while that for seeds was 100～150 Gy.The difference analysis of rates and characters in mutation and the comparison of advantages and disadvantages of the two methods could provide theory and technique references for irradiation bree...
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