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- W2136925518 abstract "A region of the nuclear ribosomal DNA containing the internal transcribed spacer 1 (ITS1), the 5.8S DNA and the internal transcribed spacer 2 (ITS2) was sequenced in 12 Polymyxa graminis and P. betae isolates, with particular emphasis on P. graminis from peanut clump-infested areas of the Indian subcontinent and West-Africa. Four different sequences were obtained from the seven isolates on sorghum or pearl millet, which differed from four sequences previously published for Polymyxa species and obtained for P. graminis isolates on barley, oat and wheat originating from temperate areas in Europe and America (two distinct sequences), for isolates on rice from Colombia and for P. betae isolates on sugar beet from several origins. The sequence variations concerned mainly the composition and length of ITS1 and ITS2 regions. Phylogenetic trees built with the distinct sequences currently known for Polymyxa spp. using parsimony, maximum likelihood and neighbour-joining methods separated P. betae from P. graminis. Within P. graminis, the hierarchy of the clustering partially matched the host range and geographical origin of the isolates. These results confirm the great diversity within P. graminis that has already been observed in host range and temperature requirements studies, and provide new arguments for considering several taxa within the species. On the basis of the ecological requirements and rDNA sequences of distinct P. graminis isolates, five special forms are proposed: P. graminis f. sp. temperata, P. graminis f. sp. tepida, P. graminis f. sp. subtropicalis, P. graminis f. sp. tropicalis and P. graminis f. sp. colombiana." @default.
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- W2136925518 date "2002-02-01" @default.
- W2136925518 modified "2023-10-15" @default.
- W2136925518 title "Phylogenetic analysis of Polymyxa species based on nuclear 5.8S and internal transcribed spacers ribosomal DNA sequences" @default.
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- W2136925518 doi "https://doi.org/10.1017/s0953756201005391" @default.
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