Total cellular DNA was extracted from 28 isolates of Fusarium oxysporum from vascular wilt of banana. The DNA samples were digested with the restriction endonuclease HaeIII, and separated in agarose gels. Two characteristic banding patterns were seen in ethidium bromide stained gels. The two patterns correlated to strains believed to be of pathogenic races 1 and 4. A minor variation to these was detected with isolates of race 1 from Tanzania, which gave a typical race 1 band pattern, with an additional band of approx. 10 kb.
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Thomas et al. (1994) studied this question.
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