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免疫性:一种植物在任何情况内下,不能被一种病毒侵染而建立侵染点,植物本身是非寄主,这就是它的免疫性。为什么有免疫可能性呢?可能A 寄主个体上缺乏病毒所必须的营养物质;B 也有可能因为病毒未能达到可以供给它繁殖的部位或组织中去,(例如黄化型或卷叶型病毒,要直接达到韧皮部后才能发病)才能发病,不能达到这个部位或组织就不发病,即表现为免疫性。避病性:在自然状况下,病毒没有传播的介体,从而表现不发病,这就是避病。
Immunity: In any case, a plant can not be infested with a virus to establish the site of infection, the plant itself is non-host, which is its immunity. Why is it possible to immunize? It is possible that A host is deficient in the nutrients required for the virus; and B may also be unable to reach the site or tissue where it can be fed (eg yellowing or rolling virus, To directly reach the phloem after onset) can disease, can not reach this site or tissue is not disease, that is, showed immunity. Avoidance: In natural conditions, the virus does not spread mediators, thus showing no disease, which is to avoid illness.