DNA polymorphisms among Philippine isolates of the blast fungus from rice and 16 weed species were examined using restriction analysis of mitochondrial DNA (mtDNA) and DNA blot hybridization using ribosomal, single-copy, and repetitive DNA probes. Four rDNA hybridization patterns and six mtDNA restriction profiles were observed. The most frequent rDNA and mtDNA types were shared by isolates infecting rice and a group of weed species. Cluster analysis of the data obtained using probes for single-copy nuclear loci confirmed the phylogenetic relationships suggested by the mtDNA analysis, but differentiated the rice and non-rice-infecting isolates at the 50% similarity level. High levels of polymorphism between weed- and rice-infecting isolates were detected by six repetitive DNA probes []
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E. S. Borromeo (1993) studied this question.