这个词是什么意思？
A genus of gram-negative, facultatively anaerobic, rod-shaped bacteria whose organisms are associated with plants as pathogens, saprophytes, or as constituents of the epiphytic flora.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D004885 · MeSH 2026。
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