Population structure of <Emphasis Type="Italic">Eleusine</Emphasis> isolates of <Emphasis Type="Italic">Pyricularia oryzae</Emphasis> and its evolutionary implications |
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Authors: | Masaki Tanaka Hitoshi Nakayashiki Yukio Tosa |
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Institution: | (1) Laboratory of Plant Pathology, Graduate School of Agricultural Sciences, Kobe University, Kobe 657-8501, Japan |
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Abstract: | Population structure of Eleusine isolates of Pyricularia oryzae (Magnaporthe oryzae) was examined using DNA markers. On the basis of rDNA sequences, Eleusine isolates were divided into two groups. One group clustered with Triticum isolates, while the other clustered with Eragrostis isolates. This grouping was supported by DNA fingerprinting with three repetitive elements: MGR586, MGR583, and grasshopper. These results suggest that the population of Eleusine isolates is composed of at least two groups that evolved independently from the original population of P. oryzae. Most of the isolates that were collected just after an outbreak of finger millet blast in the 1970s had almost identical
fingerprint profiles although they were collected in distant prefectures. This result supports the idea that the outbreak
was caused by seed transmission of a particular strain of Eleusine isolates. |
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Keywords: | Magnaporthe oryzae Pyricularia oryzae Blast Finger millet Eleusine Pathotype |
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