TABLE 1.

Numbers of apramycin-resistant transconjugants obtained with different E. coli donors and Streptomyces recipients

E. coli donorStreptomyces recipientNo. of apramycin- resistant transconjugants/ spore
ET12567(pUZ8002, pSET152)J19295.0 × 10−3
ET12567(pUZ8002, pRT801)J19293.5 × 10−3
S17-1(pSET152)TK245.0 × 10−4
S17-1(pSET152)TK24(pRT802)9.4 × 10−4