植原体(phytoplasma)是一类没有细胞壁,不能离体培养的原核生物,对四环素敏感,主要存在于植物筛管细胞中。植原体主要通过叶蝉、飞虱等t取食植物韧皮部的昆虫传播,也可通过菟丝子寄生和嫁接等方式传播。目前,全世界已发现1000多种由植原体引起的植物病害,我国大陆已报道100余种与之相关的病害[1]。由植原体引起的病害症 Phytoplasma is a class of prokaryotic cells that are cell-free and can not be cultured in vitro. They are sensitive to tetracycline and are mainly found in plant screen cells. Phytoplasma is predominantly transmitted by the insects of the plant phloem, such as leafhoppers, planthoppers, etc. It can also be spread by dodder parasitism and grafting. At present, more than 1,000 kinds of plant diseases caused by phytoplasma have been discovered in the world. More than 100 kinds of diseases have been reported in mainland China [1]. Diseases caused by phytoplasma