Virulence of Part Populations of Aphelenchoides besseyi on Rice in China
Virulence of Part Populations of Aphelenchoides besseyi on Rice in China
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DOI：
10.3969/j.issn.1001-7216.2012.02.012
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发表时间：
2012-03-01
期刊：
影响因子：
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通讯作者：
Xie Hui
中科院分区：
文献类型：
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作者：
Pei Yan-yan;Cheng Xi;Xie Hui
为了揭示我国不同地理区域和不同寄主的贝氏阿贝氏线虫种群致病性差异，对我国8个不同地理区域和不同寄主的贝氏阿贝氏线虫种群进行了毒力调查。在温室盆栽水稻上对6个省的水稻品种进行了Besseyi试验。在A. besseyi，一个是从草莓（草莓）和七个从大米中提取。结果表明，8个种群的A. besseyi侵染辽研16号、武育粳3号和博优998 3个水稻品种，但其致病力因品种和线虫种群而异。不同水稻品种感染线虫后症状各异，辽研16号表现为“白色尖”。但其他两个没有明显症状接种线虫的品种均能抽穗，但其株高、单株穗数、穗长和千粒重均受到不同程度的影响。结果还表明，A. besseyi与寄主来源有关。A.草莓上的besseyi毒力弱于水稻上的besseyi。另外，在8个线虫群体中，HN-2对线虫最少的辽研16号的生长有明显的抑制作用。表明该种群具有较强的致病力。结果还表明，该菌的繁殖数与毒力之间不存在正相关。besseyi。以上结果表明，该菌可能存在不同的生理小种或致病型。besseyi在中国。
In order to reveal the pathogenic difference of Aphelenchoides besseyi populations from different geographic regions and hosts in China, a virulence investigation of eight populations of A. besseyi from six provinces on rice were carried out on potted rice in greenhouse. Among the eight populations of A. besseyi, one were extracted from the strawberry (Fragaria ananasa) and seven from rice. The results showed that all the eight populations of A. besseyi infected 3 varieties of rice (Liaoyan 16, Wuyujing 3 and Boyou 998), but their virulence varied with rice variety and nematode population. infection with nematodes caused various symptoms on different rice varieties with typical symptom of "white tip" on Liaoyan 16. but without obvious symptoms on the other two. All the varieties inoculated with nematodes could tassel, but their plant height, panicle number per plant, panicle length and 1000-grain weight were affected to various degree. The results also showed that the virulence of A. besseyi was related to the origin of host. The population of A. besseyi from the strawberry had weaker virulence than those from rice. In addition, among all the eight nematode populations, infection by HN-2 greatly inhibited the growth of Liaoyan 16 with least nematode. It indicated that this population had stronger virulence than the others. It also showed that there was no positive correlation between the propagation number and virulence of A. besseyi. All the results indicated that there may be different physiological races or pathotypes of A. besseyi in China.