Study on the genome of cauliflower mosaic virus (Xinjiang isolate). Restriction mapping of virion and cloned viral DNA.

The genomic DNA of CaMV (Xinjiang isolate) was mapped on the virion DNA with a number of restriction endonucleases by double digestions and partial digestions of one-end 32P-labelled fragments. It contained the unique sites of BglI, SalI and XhoI. BamHI and HhaI each cut it at two sites, EcoRI at five sites (three of which were located), HpaII at seven sites, BglII at eight sites, and HaeIII at ten sites. The sites of all the enzymes used above, as well as HindIII which cut at ten sites were also mapped on the cloned CaMV DNA. Virion DNA and cloned viral DNA gave the same results in the number and location of cleavage sites of the restriction enzymes tested on both DNAs. Like most of the other isolates, CaMV-Xinjiang isolate has three single-stranded discontinuities. From the digestion patterns of SalI, XhoI, EcoRI and HhaI, it is concluded that the restriction map of CaMV-XJ genome is closely related to that of BKMV isolate from East Germany.