Diversity and Distribution of Rice Blast (Pyricularia oryzae Cavara) Races in Bangladesh
Diversity and Distribution of Rice Blast (Pyricularia oryzae Cavara) Races in Bangladesh
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DOI：
10.1094/pdis-12-15-1486-re
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发表时间：
2016-10-01
期刊：
影响因子：
4.5
通讯作者：
Fukuta, Y.
中科院分区：
文献类型：
--
作者：
Khan, M. A. I.;Ali, M. A.;Fukuta, Y.
采用亲和性测定法，对来自孟加拉国不同地区和生态系统的331个稻瘟病分离物（Pyricularia Cavara）在23个单抗品种（DV）和感病品种“丽江新团黑谷”（LTH）上的致病性进行了测定。一个广泛的变化，在致病力的菌株，267个小种进行了分类，使用一个新的命名系统。孟加拉国广泛分布着对携带Pia、Pib、Pit、Pik-s、Piz-t、Pi 12（t）、Pi 19（t）和Pi 20（t）抗性基因的DV具有毒力的稻瘟病分离物，以及对携带Pish、Pi 9、Pita-2和Pita的稻瘟病分离物无毒力的稻瘟病分离物。根据毒力谱的不同，主要表现在对Pii、Pi 3、Pi 5（t）、Pik-m、Pi 1、Pik-h、Pik、Pik-p和Pi 7（t）的反应上。第一组菌株主要分布在灌溉低地，而第二组菌株主要发现在灌溉低地，但没有关键的差异，在地理分布的稻瘟病菌株。共筛选出26个可根据反应模式鉴定23个抗病基因的分离物作为标准鉴别分离物。据我们所知，这是第一次清楚地表明孟加拉国稻瘟病种族的多样性和差异。这一信息将用于在该国发展一种持久的防爆系统。
The pathogenicity of 331 blast isolates (Pyricularia oryzae Cavara) collected from different regions and ecosystems for rice cultivation in Bangladesh was evaluated by compatibility on 23 differential varieties (DV), each harboring a single blast resistance gene, and susceptible 'Lijiangxintuanheigu' (LTH). A wide variation in virulence was found among the isolates, and 267 races were classified using a new designation system. Virulence of blast isolates against DV carrying the resistance genes Pia, Pib, Pit, Pik-s, Piz-t, Pi12(t), Pi19(t), and Pi20(t), as well as avirulence against those carrying Pish, Pi9, Pita-2, and Pita, was distributed widely in Bangladesh. Cluster analysis of the compatibility data on the DV initially classified the isolates into groups I and The virulence spectra of the two groups differed mainly according to the reactions of the DV to Pii, Pi3, Pi5(t), Pik-m, Pi1, Pik-h, Pik, Pik-p, and Pi7(t). Group I isolates were distributed mainly in rainfed lowlands, whereas group II isolates were found mainly in irrigated lowlands; however, there were no critical differences in geographic distribution of the blast isolates. In total, 26 isolates, which could be used to identify the 23 resistance genes of the DV on the basis of their reaction patterns, were selected as a set of standard differential blast isolates. To our knowledge, this is the first clear demonstration of the diversity and differentiation of blast races in Bangladesh. This information will be used to develop a durable blast protection system in that country.