The exogenous DNAs of G.bickll P. and H.Cannabinus were introduced into the upland cotton Si 2 by Ar +implantation and DNA solution trickling method. The results showed that the exogenous DNA introduction was promoted significantly and the types and frequencies of character variation in progeny were increased by Ar + implantation. Furthermore, most of the variation tend to be stable. Among the Ar +implantation doses tested, 2×10 15 Ar +/cm 2 was the best for introducing exogenous DNA and ...
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