Distribution of Pathogenic Races of Rice Blast Fungus in Vietnam
Distribution of Pathogenic Races of Rice Blast Fungus in Vietnam
复制标题
越南稻瘟病菌病原菌种的分布
DOI：
10.3186/jjphytopath.65.526
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
E. LaiVan
中科院分区：
文献类型：
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作者：
T. Noda;N. Hayashi;P. Du;H. D. Dinh;E. LaiVan
1995 - 1996年，在越南主要是湄公河三角洲（MRD）收集了129个稻瘟病菌单孢子分离物，以表征其毒力。根据这些菌株对12个日本鉴别水稻品种（改良清泽鉴别品种）的致病力，将其分为12个致病类群（小种）。在MRD的10个省中发现了002.4小种，其次是106.4、006.4、102.4和002.0小种。鉴别品种Aichi Asahi（携带抗病基因Pia）和K59（Pit）对病菌的感病率分别为93.8%和86.0%。另一方面，没有一个分离物对鉴别菌株Shin 2（Pik-s，Pish）、Kusabue（Pik，Pish）、Pununishiki（Piz，Pish）、Pi No.4（Pita-2，Pish）、托里德1（Piz-t）、K60（Pik-p）和BL 1（Pib，Pish）具有毒性。参比品种AA/S2 - 3（只携带一个Pish抗性基因）对所有菌株均表现抗性，而AA/S2 - 75（只携带Pik-s抗性基因）对95.3%的菌株表现感病。因此，在Shin 2中，Pik-s和Pish的抗性可能是由于Pish或未知基因。45个越南水稻品种对4个不同小种的菌株的反应模式，根据它们对日本鉴别品种的致病力，可分为8类。这些结果表明，越南分离物的致病性是复杂的，越南分离物的致病性专化可能难以使用日本鉴别品种进行详细分类。
One hundred and twenty-nine monoconidial isolates of Pyricularia grisea from rice were collected in Vietnam, mainly in the Mekong River Delta (MRD), in 1995-1996 to characterize their virulence. These isolates were classified into 12 pathogenic groups (races) based on their virulence to 12 Japanese differential rice varieties (modified Kiyosawa's differentials). Race 002.4 was predominant and was found in 10 provinces of MRD, followed by races 106.4, 006.4, 102.4 and 002.0. Differential varieties Aichi Asahi (which carries resistance gene Pia) and K59 (Pit) were susceptible to 93.8% and 86.0% of the isolates, respectively. On the other hand, none of the isolates were virulent to differentials Shin 2 (Pik-s, Pish), Kusabue (Pik, Pish), Fukunishiki (Piz, Pish), Pi No.4 (Pita-2, Pish), Toride 1 (Piz-t), K60 (Pik-p) and BL1 (Pib, Pish). The reference rice variety AA/S2-3, which carries only one resistance gene Pish, was also resistant to all the isolates, but the variety AA/S2-75, carrying only Pik-s, was susceptible to 95.3% of the isolates. Therefore, the resistance in Shin 2, with Pik-s and Pish, might be due to Pish or an unknown gene(s). Reaction patterns of 45 Vietnamese rice varieties to four isolates belonging to different races, based on their virulence to the Japanese differential varieties, could be classified into eight groups. These results suggested that the pathogenicity of the Vietnamese isolates was complex and that the pathogenic specialization of Vietnamese isolates may be difficult to classify in detail using the Japanese differential varieties.