Notes on the Occurrence of Pathogenic Races of <Emphasis Type="Italic">Xanthomonas oryzae </Emphasis>pv. <Emphasis Type="Italic">oryzae </Emphasis>Found in Hiroshima Prefecture in 1999 |
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| Authors: | Takashi OKU Kotaro SATO Masaki KURAO Shohei MATSUURA Yasufumi SAKAI Takao TSUCHIYA |
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| Institution: | (1) School of Bioresources, Hiroshima Prefectural University, Shoubara 727–0023, Japan, JP;(2) Institute of Biotechnology, Hiroshima Prefectural Agriculture Research Center, Higashihiroshima 739–0151, Japan, JP;(3) Environmental Research Division, Hiroshima Prefectural Agriculture Research Center, Higashihiroshima 739–0151, Japan, JP;(4) Crop Research Division, Hiroshima Prefectural Agriculture Research Center, Higashihiroshima 739–0151, Japan, JP |
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| Abstract: | The pathogenic race of 59 cultures of Xanthomonas oryzae pv. oryzae, a pathogen of bacterial leaf blight of rice, isolated from six locations in the inland mountainous area of Hiroshima Prefecture
in 1999, were determined by a set of traditional differentials. Four races—I, II, V and VII—were found across the area; however,
we noticed the composition of the races as well as the dominant race in each location different. All races were avirulent
on differential cultivar Te-tep. Races V and VII were new to Hiroshima. The rice cultivars infected with bacterial leaf blight
in Hiroshima are thought to be grouped into the Kinmaze group, which does not have any resistance genes. Apparently, a variety
of races occurred unexpectedly on the cultivars contrary to stabilizing selection theory.
Received 25 February 2000/ Accepted in revised form 13 July 2000 |
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| Keywords: | : Xanthomonas oryzae pv oryzae pathogenic race rice bacterial leaf blight |
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