A Set of Standard Differential Blast Isolates (<I>Magnaporthe grisea</I> (Hebert) Barr.) from the Philippines for Rice (<I>Oryza sativa</I> L.) Resistance
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概要
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A total of 119 blast (<I>Magnaporthe grisea </I>(Hebert) Barr.) isolates collected from the Philippines, were characterized for their pathogenicities using 19 rice (<I>Oryza sativa </I>L.) differential varieties (DVs) targeting for 18 resistance genes. These isolates were classified into 31 groups based on the reaction patterns to 9 DVs for targeting 9 resistance genes, <I>Pia</I>, <I>Pib</I>, <I>Pii</I>, <I>Pit</I>, <I>Pita</I>, <I>Pish</I>, <I>Piz-t</I>, <I>Pi3</I>, and <I>Piz-5</I>, at first, and then further divided into 70 pathotypes considering the reaction pattern of the other 9 DVs for the other resistance genes, <I>Pik</I>, <I>Pik-h</I>, <I>Pik-m</I>, <I>Pik-p</I>, <I>Pik-s</I>, <I>Pita-2</I>, <I>Piz</I>, <I>Pi1</I>, and <I>Pi20</I>(t). Twenty isolates that have differentiating ability, stable reactions and good sporulating ability were selected. The reactions of these isolates were confirmed using the monogenic lines as a set of DVs for targeting 24 resistance genes, <I>Pia</I>, <I>Pib</I>, <I>Pii</I>, <I>Pik</I>, <I>Pik-h</I>, <I>Pik-m</I>, <I>Pik-p</I>,<I>Pik-s</I>, <I>Pish</I>, <I>Pit</I>, <I>Pita</I>, <I>Pita-2</I>, <I>Piz</I>, <I>Piz-t</I>, <I>Piz-5</I>, <I>Pi1</I>, <I>Pi3</I>, <I>Pi5</I>(t), <I>Pi7</I>(t), <I>Pi9</I>(t), <I>Pi11</I>(t), <I>Pi12</I>(t), <I>Pi19</I>(t), and <I>Pi20</I>(t). Several resistance alleles of <I>Pik </I>locus, <I>Pik</I>, <I>Pik-h</I>, <I>Pik-m</I>, and <I>Pik-p</I>, and <I>Pi1 </I>had the same reaction patterns and could not be differentiated by these selected blast isolates. No avirulent isolate for <I>Pit </I>and <I>Pi19 </I>was found. The three genes, <I>Pish</I>, <I>Piz-5</I>, and <I>Piz</I>, showed a wide spectrum of moderate resistances to these isolates. These findings suggested the existence of a wide variation of blast pathogens in the Philippines. This information on pathogenicity of blast isolates from the Philippines will be also useful to understand the differentiation and relationship between blast races and resistance genes. The monogenic lines as the DVs and the selected 20 blast isolates can be used as the first differential system, which can characterize the resistances of rice varieties and pathogenicities of blast isolates in the tropics.
- 独立行政法人 国際農林水産業研究センターの論文
著者
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Ebron Leodegario
International Rice Research Institute
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TELEBANCO-YANORIA Mary
International Rice Research Institute
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Kobayashi Nobuya
International Rice Res. Inst.
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Fukuta Yoshimichi
Japan International Res. Center For Agricultural Sciences
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Tsunematsu Hiroshi
Japan International Research Center For Agricultural Sciences (jircas)
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KATO Hiroshi
National Agriculture and Food Research Organization (NARO) Institute of Crop Science
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IMBE Tokio
National Agricultural Research Center for Kyushu Okinawa Region, NARO
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VERA CRUZ
International Rice Research Institute
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TSUNEMATSU Hiroshi
Japan International Research Center for Agricultural Sciences
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