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引言 Wingard观察烟环斑病毒在烟的接种叶上产生环斑之后,系统感染的叶上也出现环斑,但此后新生叶上的环斑逐渐趋向集中在叶尖部分,终于在再次新生的叶上没有病状了。他在这些已无病状的新生叶上再接种病毒时却不能再出现病状,但是用这些已无病状的叶汁接种健康植株的叶上却产生典型的环斑,这结果说明虽然已无病状但仍有病毒。他认为这是一种免疫现象。Price重复证明了上述的观察,并且注意到这种复原现象的环境条件相当广;用复原植株所作扦插的植株上再接种病毒也不再出现病状,但扦插
Introduction Wingard observed that the ring spot was found on the systemic infected leaves of the tobacco ring spot virus after ring spot formation on the tobacco inoculated leaves, but then the ring spot on the new leaf gradually concentrated in the tip part, No symptoms on it. He could no longer show symptoms when he was re-vaccinated against these disease-free neovasculants, but the use of these disease-free leaf juice to inoculate the leaves of healthy plants produces typical ring spots, indicating that although no disease is present There are still viruses. He thinks this is an immune phenomenon. Price repeated the above observations and noted that the environmental conditions for this restoration were quite broad; no reinfection of the virus on plants that had been cut with the plants of rehab was no longer present, but cuttings