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- W2123260145 abstract "Abstract A fragment of the mitochondrial cytochrome b (cyt b) gene of 13 agronomically important plant pathogenic Basidiomycetes was sequenced, including several Puccinia spp., Uromyces appendiculatus , Phakopsora pachyrhizi , Hemileia vastatrix and Rhizoctonia solani . The deduced amino acid sequences (residues 142–266) were used to study the relatedness of these pathogens as compared to other species of the Basidiomycetes, Ascomycetes and Oomycetes. The relatedness was also studied at nuclear level using the Internal Transcribed Spacers (ITS) in the ribosomal DNA. Phylogenic trees were constructed with the maximum parsimony (MP) and the neighbour‐joining (NJ) methods. On the basis of both cytochrome b and ITS sequences, the Puccinia species pathogenic to graminaceous crop plants, such as Puccinia recondita f. sp. tritici , Puccinia graminis f. sp. tritici, Puccinia striiformis f. sp. tritici, Puccinia coronata f. sp. avenae, Puccinia hordei, P. recondita f. sp. secalis and Puccinia sorghi , together with Puccinia horiana from Chrysanthemum , were very closely related to each other, whereas Puccinia arachidis (from peanut) was closely related to U. appendiculatus (from beans) but more distant from the other Puccinia species. Both rusts on soybean ( P. pachyrhizi ) and coffee ( H. vastatrix ) were outside the Puccinia cluster. All rusts were separated from other Basidiomycetes such as R. solani and the strobilurin producing species Strobilurus tenacellus and Mycena galopoda . Our results demonstrate that the amino acid sequence of the mitochondrial cytochrome b is a valid tool to study phylogenic relatedness among plant pathogenic Basidiomycetes and supports taxonomic grouping based on morphological structures and host specificity. Because of their high variability, ITS sequences were able to discriminate Puccinia species, which were identical on the basis of the cytochrome b amino acid sequence. Thus, ITS sequences could better show differences among species or within a species, whereas cytochrome b is more suitable than ITS for phyologenic inference at family or genus level. In addition, the sequence data obtained during this study represent essential information for easy isolation of the cyt b gene and detection of point mutations conferring resistance to Qo Inhibitor fungicides that eventually may evolve." @default.
- W2123260145 created "2016-06-24" @default.
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- W2123260145 date "2006-01-26" @default.
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- W2123260145 title "Relatedness Among Agronomically Important Rusts Based on Mitochondrial Cytochrome b Gene and Ribosomal ITS Sequences" @default.
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- W2123260145 doi "https://doi.org/10.1111/j.1439-0434.2006.01070.x" @default.
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