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1.
The cereal cyst nematode(CCN, Heteroder aavenae) causes serious yield loss on cereal crops, especially wheat, worldwide. Daxing population in Beijing City and Huangyuan population in Qinghai Province, China, are two CCN populations. In this study, the CCN pathotypes of Daxing and Huangyuan populations were characterized by tests on 23 standard "International Test Assortment" with the local species Wenmai 19 as the susceptible control. Tested materials were grouped by three nematode populations' virulence on resistant genes(Rha1, Rha2, Rha3, Cre1) and nonresistant genes, varieties and lines. Both Daxing and Huangyuan populations were avirulent to Ortolan(Ha1). Barley cvs. Ortolan, Siri, Morocco, Bajo Aragon 1-1, and Martin 403-2 were all resistant to both populations. Cultivars Herta, Harlan 43 and wheat Iskamish-K-2-light were all susceptible to Huangyuan population, all of them, however, were resistant to Daxing population. The other five oats were all resistant to the two tested CCN populations. Except Iskamisch K-2-light, all the other wheat cultivars(Capa, Loros×Koga, AUS 10894, and Psathias) were susceptible to Daxing population. Because the pathotypes of the two tested CCN populations in Beijing and Qinghai were not identical to any of the 13 pathotypes previously characterized by the test assortment, we classified Daxing and Huangyuan populations as the new pathotypes, named Ha91.  相似文献   

2.
以小麦稳定表达的肌动蛋白(Actin)为对照,利用半定量RT-PCR技术对小麦禾谷胞囊线虫(Heterodera ave nae)接种后在不同抗性品种不同时期不同部位的几丁质酶基因Cht4的表达量进行了分析.结果表明,接种12 h后,Cht4的表达量无明显的增加,抗、感品种之间差异不明显;接种36 h后,抗、感品种中的Cht4的表达量都明显增加,抗性品种中的表达量明显高于感病品种,叶部表达量高于根部的表达量;接种60 h后,抗、感品种中Cht4的表达量都维持在较高的表达水平,抗病品种比感病品种中Cht4的表达量高;接种84 h后,感病品种与接种前相比变化不明显,而抗病品种的表达量仍高于接种前的表达量.  相似文献   

3.
正The cereal cyst nematodes(Heterodera avenae,Heterodera filipjevi,Heterodera latipons)are considered to be one of the most important plant parasitic nematodes attacking most cereals and can cause significant crop losses(Sikora 1988).In China,H.filipjevi(Madzhidov 1981)Stelter,1984,was first reported from Henan province(peng et al.2010)and a few years later in Anhui province and Xinjiang Uygur Autonomous Region(peng et al.2016,2018).In December 2017,a survey for cereal  相似文献   

4.
根据旱稻孢囊线虫(Heterodera elachista)和常见孢囊线虫的ITS序列比对分析,设计1对旱稻孢囊线虫特异性引物He–F/He–R,特异性片段长度为281 bp。运用该特异性引物及建立的DNA提取方法和PCR体系,可特异性检测旱稻孢囊线虫单条2龄幼虫,可以从混合有1条旱稻孢囊线虫的0.1 g水稻根组织中特异性检测出目的DNA片段。特异性引物He–F/He–R与通用引物D2A/D3B结合,运用一步双重PCR检测方法可快速鉴定单孢囊,也可从初始分离的田间土壤总线虫样品中直接检测出旱稻孢囊线虫。  相似文献   

5.
三重荧光定量PCR检测水产动物源细菌磺胺类耐药基因   总被引:1,自引:0,他引:1  
根据Gen Bank中细菌磺胺类耐药基因Sul1、Sul2和Sul3的保守序列设计3对特异性引物及相应Taq Man探针,以重组质粒标准品为模板对反应条件进行优化,建立一种可同时检测上述3种耐药基因的三重荧光定量PCR方法,并对该方法进行敏感性、特异性、重复性及临床菌株检测试验。结果表明:该方法定量范围为1×10~1~1×10~8拷贝/反应时,其标准曲线呈良好的线性关系;该方法灵敏度高(3个基因的最低质粒检测限均可达到10拷贝/反应)、特异性强(与其他病原菌及病毒无交叉反应)、重复性好(变异系数均小于2%);对临床菌株的检测结果与药敏试验结果的符合率达94.2%,且整个检测过程可在2 h内完成。所建立的可同时检测Sul1、Sul2和Sul3基因的三重荧光定量PCR方法可用于临床检测细菌的磺胺类耐药基因。  相似文献   

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