Obligate intracellular pathogen that causes onions yellow disease. Onion yellows phytoplasma OY-M

Onion yellows phytoplasma strain OY-M. This strain (OY-M) is derived from a wild-type disease-causing strain (OY-W; onions yellow disease) which was isolated in Saga Prefecture, Japan, in 1982, and shows mild symptoms and does not cause stunting nor phloem hyperplasia (excessive increase in number of cells). The genome consists of a circular chromosome and two smaller extrachromosomal elements. This bacterium lacks a phosphotransferase system, pentose phosphate pathway, and surprisingly, any ATP synthase genes, suggesting it imports ATP from the cytoplasm of the host cell in which it resides.

洋葱黄化植原体（Onion yellows phytoplasma）OY-M菌株。该菌株（OY-M）来源于1982年在日本佐贺县分离得到的野生型致病菌株OY-W（引发洋葱黄化病），其致病症状较为温和，不会导致植株矮化及韧皮部增生（细胞数量过度增加）。该菌的基因组由一条环状染色体与两个小型染色体外元件组成。这种细菌缺失磷酸转移酶系统、磷酸戊糖途径，且令人意外的是，它不携带任何ATP合酶（ATP synthase）基因，这表明它会从自身寄生的宿主细胞的细胞质中摄取ATP。