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Coexistence among Epiphytic Bacterial Populations Mediated through Nutritional Resource Partitioning

机译：营养资源分配介导的附生细菌种群的共存

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The levels of coexistence between Pseudomonas syringae and various nonpathogenic epiphytic species in the phyllosphere of beans (Phaseolus vulgaris) were assessed by using replacement series. The epiphytic species Pseudomonas fluorescens, Pantoea agglomerans, Stenotrophomonas maltophilia, and Methylobacterium organophilum were all capable of exhibiting higher levels of coexistence with P. syringae than was observed with a near-isogenic P. syringae strain pair. The ecological similarity of the epiphytes was estimated with niche overlap indices derived from in vitro carbon source utilization profiles. The level of coexistence of the epiphytes was inversely correlated with the ecological similarity of the strains. Hence, the level of coexistence between the epiphytes was proportional to the degree of niche differentiation, defined as the ability to utilize carbon sources not utilized by a competing strain. Comparisons of utilization profiles for groups of carbon sources (amino acids, organic acids, and carbohydrates) indicated the types of carbon sources for which the strains likely competed in the bean phyllosphere. P. fluorescens and P. syringae strains probably competed for most carbon sources. S. maltophilia and M. organophilum strains probably competed with P. syringae for most organic acids but few amino acids or carbohydrates. P. agglomerans strains probably competed with P. syringae for most amino acids and organic acids but few carbohydrates. A variable level of coexistence observed between P. agglomerans and P. syringae probably reflected the variability in abundance in the bean phyllosphere of the carbohydrates that P. agglomerans utilized exclusively.
机译：通过使用替代序列评估了丁香假单胞菌与豆类叶序层中各种非致病性附生物种之间的共存水平。与近等基因的丁香假单胞菌菌株对相比，附生种荧光假单胞菌，团聚泛菌，嗜麦芽单支嗜单胞菌和嗜酸甲基杆菌都能够表现出与丁香假单胞菌共存的更高水平。附生植物的生态相似性是通过从体外碳源利用概况得出的生态位重叠指数来估算的。附生植物的共存水平与菌株的生态相似性成反比。因此，附生植物之间的共存水平与生态位分化程度成正比，生态位分化程度定义为利用竞争菌株未利用的碳源的能力。通过比较碳源（氨基酸，有机酸和碳水化合物）的利用状况，可以确定菌株可能在豆根系中竞争的碳源类型。荧光假单胞菌和丁香假单胞菌菌株可能竞争大多数碳源。嗜麦链球菌和嗜有机链球菌菌株可能与丁香假单胞菌竞争大多数有机酸，但很少有氨基酸或碳水化合物。团聚假单胞菌菌株可能与丁香假单胞菌竞争大多数氨基酸和有机酸，但是碳水化合物却很少。团聚假单胞菌和丁香假单胞菌之间观察到的可变水平的共存水平可能反映了团聚假单胞菌专门利用的碳水化合物在豆根系中的丰度变化。

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