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寄生于植物维管束系统引起黄化型病害的病原微生物,目前已知有螺原体(Spiroplasma-Like Organism)。类菌质体(Mycoplasma-Like organism)和难养细菌(Fastidious bacteria)。它们均为原核生物。前二者没有细胞壁属于菌质体类(Mycoplasma);后者在70年代被称为类立克次体或类立克次体细菌(RLO或RLB)。因具有明确的细胞壁结构,而且DNA的G—C比值相当于细菌,现已归入细菌类中。类菌质体至今尚未能在人工培养基中培养,大多数螺原体和少数难养细菌虽已在人工培养基上培养成功,但需
Spiroplasma-Like Organism is known to be present in pathogenic microorganisms that cause phyto-phytopathogenic diseases caused by vascular bundles in plants. Mycoplasma-Like Organism and Fastidious bacteria. They are all prokaryotes. None of the former cell walls belong to the genus Mycoplasma; the latter was referred to as Rickettsia or Rickettsia-like bacteria (RLO or RLB) in the 1970s. Because of its clear cell wall structure, and DNA G-C ratio equivalent to bacteria, now classified as bacteria. Mycoplasma has not yet been cultured in artificial media, most of the spiroplasts and a small number of hard-to-culture bacteria have been successfully cultured on artificial medium, but need