除了上述典型的过敏性坏死反应特征以外，寄主细胞还产生了细胞壁防御结构和次生物质。
Besides from the above-mentioned typical characters of hypersensitive reaction, the host cells also produced defense structure in cell walls and secondary metabolic materials.
植原体是引起众多植物病害的一类重要的无细胞壁的原核致病菌，其寄主种类多、危害面积广，对经济、环境等影响严重。
Phytoplasmas are cell wall-less prokaryotic pathogens causing many plant diseases with various host plants, widely geographical distribution and adverse impacts on economics and environments.
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