Competence of roots for race-specific resistance and the induction of acquired resistance against Magnaporthe oryzae
Competence of roots for race-specific resistance and the induction of acquired resistance against Magnaporthe oryzae
复制标题
DOI：
10.1111/j.1364-3703.2006.00331.x
复制
发表时间：
2006-05-01
影响因子：
4.9
通讯作者：
Schaffrath, U
中科院分区：
文献类型：
--
作者：
Jansen, M;Slusarenko, AJ;Schaffrath, U
稻瘟病的病原菌--稻瘟病菌被认为是一种典型的叶部侵染植物病原真菌。然而，最近有报道称，稻瘟病菌与侵染根部的病原菌有许多共同的特征，确实能够侵染根部。在这里，我们报道了测试水稻和大麦根部抵御稻瘟病菌侵染能力的研究。我们发现水稻根部被稻曲霉侵染的方式不同于相同基因类型的叶片中的基因对基因的特异性。此外，苯并-(1，2，3)-噻二唑-7-甲基硫代甲酸酯(BTH)处理水稻幼苗，虽然可以降低稻瘟病的发病率，但并不能防止水稻根部被稻瘟病菌侵染。此外，BTH不能保护大麦根系免受稻瘟病菌的侵染。综上所述，我们的结果表明，尽管根在抵抗稻瘟病菌侵染能力上表现出内在的差异，但基因对基因的不亲和性和获得的抗性都不像叶片那样有效地阻断病原菌。
Generally, Magnaporthe oryzae, the causal agent of rice blast disease, is considered to be a typical leaf-infecting plant pathogenic fungus. However, it was recently reported that M. oryzae shares many characteristics in common with root-infecting pathogens and indeed was able to infect roots. Here, we report on studies testing for the capacity of roots of rice and barley to resist infections with M. oryzae. We established that roots of rice plants were colonized by M. oryzae in a manner which is different from the gene-for-gene specificity seen in leaves for the same genotypes. Furthermore, treatment of rice seedlings with benzo-(1,2,3)-thiadiazole-7-carbothioic acid S-methyl ester (BTH), a chemical that protects leaves effectively against blast by conditioning acquired resistance, was not able to prevent colonization of roots by M. oryzae although a reduction in disease levels was observed. Moreover, BTH was not able to protect barley roots against infection with M. oryzae. Taken together, our results suggest that although roots show intrinsic variation in their ability to resist colonization by M. oryzae, neither gene-for-gene incompatibility nor aquired resistance are as effective at blocking the pathogen as they are in leaves.