Total genomic plant DNA extracted from dahlia and other known
hosts of DMV was used for Southern blot hybridization using cloned
DNA of DMV-D10 as probes. Hybridization was observed with both
undigested and restriction endonuclease-digested dahlia genomic
DNA extracted from seedlings, seed coat as well as roots using DMVD10
specific probes (Figs. 3a and b). The hybridization signal for DNA
extracts from dahlia seed coat was very weak, possibly due to the
difficulty of obtaining quality genomic DNA. None of the hybridization
signals were seen to occur at ~7 kb, which was expected for genomic
DNA of DMV-D10. In contrast, all of the hybridization signals from the
undigested DNA occurred at high molecular weights which are expected
for dahlia genomic DNA (Figs. 3a and b). A single hybridization