Abstract
The T-DNA region of the root-inducing (Ri) plasmid (pRi1724) in the mikimopine type Agrobacterium rhizogenes strain MAFF03-01724 isolated in Japan was detected and characterized by means of Southern blot hybridization with the T-DNA probe of the plasmid pRiA4b in the agropine type A. rhizogenes strain A4. Although the homologous sequences with TL-DNA of pRiA4b was found on pRi1724, no homologous sequence with TR-DNA was found. The presence of pRi1724 sequences was demonstrated in the genome of Ajuga reptans hairy roots by the infection with strain1724. The T-DNA of pRi1724 was mapped by means of cloned BamHI partial digests. The homologous sequences with virulence region of pRiA4b was also found.
