Diversity and Distribution of Rice Blast (Pyricularia oryzae Cavara) Races in Vietnam
Diversity and Distribution of Rice Blast (Pyricularia oryzae Cavara) Races in Vietnam
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DOI：
10.1094/pdis-05-19-1008-re
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发表时间：
2020-02-01
期刊：
影响因子：
4.5
通讯作者：
Fukuta, Yoshimichi
中科院分区：
文献类型：
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作者：
Nguyen T M Nguyet;Hoang H Long;Fukuta, Yoshimichi
从越南北方和中部采集的239个稻瘟病（Pyricularia Cavara）菌株对25个含有23个抗性基因的鉴别品种（DV）和感病品种丽江新团黑谷（LTH）的反应模式显示出广泛的致病性差异。对Pish、Pik-m、Pi 1、Pik-h、Pik、Pik-p、Pi 7（t）、Pi 9（t）、Piz-5、Pita-2和Pita的毒力较低，但对Pib、Pit、Pia、Pii、Pi 3、Pi 5（t）、Pik-s、Piz、Piz-t、Pi 12（t）、Pi 19（t）和Pi 20（t）的毒力较高。根据对DV和LTH的反应模式，将分离株分为三个聚类组Ia、Ib和II。对Pik-m、Pi 1、Pik-h、Pik、Pik-p、Pi 7（t）、Pi 9（t）、Piz、Piz-5、Pita-2和Pita等11个DV的毒力频率在聚类II中高于对Ia和Ib的毒力频率，对Piz-t的毒力频率低于对Ia和Ib的毒力频率。Pii、Pi 3、Pi 5（t）和Piz-t的DV频率在聚类Ia和Ib之间不同。Ia和Ib类群在东北、中北部和中南部沿海地区的分布频率相近，但在红河三角洲和西北地区的分布频率不同。这意味着这两个地区的爆炸比赛与其他地区不同。总体而言，稻瘟分离株可分为153个小种。其中，26个被选为一套标准的鉴别稻瘟病分离物的23个抗性基因的特征和发展的鉴别系统在越南。
A total of 239 isolates of blast (Pyricularia oryzae Cavara) collected from northern and central Vietnam showed a wide variation in pathogenicity based on the reaction patterns to 25 differential varieties (DVs) harboring 23 resistance genes and susceptible cultivar Lijiangxintuanheigu (LTH). The frequencies of isolates virulent toward DVs for Pish, Pik-m, Pi1, Pik-h, Pik, Pik-p, Pi7(t), Pi9(t), Piz-5, Pita-2, and Pita were low, but they were high for DVs for Pib, Pit, Pia, Pii, Pi3, Pi5(t), Pik-s, Piz, Piz-t, Pi12(t), Pi19(t), and Pi20(t). Isolates were classified into three cluster groups Ia, Ib, and II based on reaction patterns to DVs and LTH. The frequencies of isolates virulent toward 11 DVs for Pik-m, Pi1, Pik-h, Pik, Pik-p, Pi7(t), Pi9(t), Piz, Piz-5, Pita-2, and Pita in cluster II and DV for Piz-t were higher and lower than those of Ia and Ib, respectively. The frequencies to DVs for Pii, Pi3, Pi5(t), and Piz-t were different between clusters Ia and Ib. Clusters Ia and Ib were distributed with similar frequencies in the northeast, north central, and south central coast regions, but the frequencies among three cluster groups in the Red River Delta and northwest regions were different. This means that the blast races in these two regions were different from the others. Overall, the blast isolates were categorized into 153 races. Among them, 26 were selected as a set of standard differential blast isolates for characterizing 23 resistance genes and developing a differential system in Vietnam.