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首页> 外文期刊>Australian Journal of Crop Science >Identification of virulent pathotypes causing rice blast disease (Magnaporthe oryzae) and study on single nuclear gene inheritance of blast resistance in F 2 population derived from Pongsu Seribu 2 × Mahshuri
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Identification of virulent pathotypes causing rice blast disease (Magnaporthe oryzae) and study on single nuclear gene inheritance of blast resistance in F 2 population derived from Pongsu Seribu 2 × Mahshuri

机译：识别水稻稻瘟病（Magnaporthe oryzae）的致病性强毒型并鉴定来自Pongsu Seribu 2×Mahshuri的F 2群体的稻瘟病抗性单核基因遗传

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Ten pathotypes of Magnaporthe oryzae found in Malaysia were tested against thirteen different Malaysian modern rice varieties/cultivars including resistant and susceptible to identify the most virulent pathotypes. The inheritance of blast disease resistance was studied using local cultivars by making normal and reciprocal crosses between resistance variety Pongsu Seribu 2 (Oryza sativa L. subsp. indica) and susceptible variety Mahsuri (Oryza sativa L. subsp. indica). Pathotype pathotype P7.2 followed by pathotype P5.0 was found as the most virulent against the cultivars. The disease scale of >2.5 was observed in six varieties against P7.2 and in five varieties against pathotype P5.0. Nineteen F1 hybrids were confirmed using SSR marker RM168 and were selfed to produce F2 populations. A total of 2560 F2 plants from normal crosses and 3182 from reciprocal crosses were challenged with pathotype P7.2. A 3:1 (R:S) segregation ratio was observed in both types of crosses using the chi-square test, indicating the maternal effect which showed resistance to the blast disease caused by pathotype P7.2 is most likely controlled by a single nuclear gene. As a single resistance gene is able to retain the resistance for a short period, developing new breeding lines will be the alternative, rather than having no resistant material with multiple genes.
机译：在马来西亚发现的十种稻瘟病菌对三种不同的马来西亚现代水稻品种/品种进行了测试，包括抗药性和易感性，以确定最强毒力的病态。通过在抗性品种Pongsu Seribu 2（Oryza sativa L. subsp。indica）和易感品种Mahsuri（Oryza sativa L.subsp.indica）之间进行正态和反向杂交，研究了使用当地品种对瘟病抗性的遗传。病理型P7.2和随后的P5.0被认为是最强的品种。在六个针对P7.2的品种和五个针对P5.0致病型的品种中观察到的疾病等级> 2.5。使用SSR标记RM168确认了19个F1杂种，并自交以产生F2种群。 P7.2型感染了来自正常杂交的2560株F2植株和来自反向杂交的3182株植株。使用卡方检验在两种类型的杂交中均观察到3：1（R：S）的分离比率，这表明母本效应表明对由病原体P7.2引起的原发性疾病的抵抗力很可能由单核控制基因。由于单个抗性基因能够在短期内保持抗性，因此开发新的育种系将是替代方案，而不是不使用具有多个基因的抗性材料。

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