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Abstract : Cells are nonmotile, non‐spore‐forming coccobacilli (0.9–1.1 µm). Gram‐negative. Strictly respiratory with oxygen or nitrate as terminal electron acceptor. The optimal temperature for growth is 15–30°C, feeble at 40°C; no growth at 42°C. Optimal growth occurs between pH 7 and 9; no growth at pH 6 or less. Broth cultures form aggregates in stationary phase, and static broth cultures form a thick, brittle pellicle near the surface. Colonies on agar medium are low convex, nonpigmented, smooth, shiny, and mostly regular in shape, raised with a wrinkled surface upon extended incubation for more than 72 h. Catalase‐ and oxidase‐positive. A narrow range of substrates are oxidized, mostly organic acids, for example, malate, succinate, fumarate, citrate, and oxaloacetate and also l‐glutamate and l‐proline; d‐galactonate and d‐gluconate are oxidized by some strains. Strict endophytes found in the leaf glands of the tropical yam Dioscorea sansibarensis.
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Contributor : Aurélien Carlier <>
Submitted on : Thursday, October 8, 2020 - 9:25:49 PM
Last modification on : Wednesday, May 12, 2021 - 8:17:07 AM




Aurélien Carlier. Orrella. Bergey's Manual of Systematics of Archaea and Bacteria, John Wiley and Sons Inc, 2019, 9781118960608. ⟨10.1002/9781118960608.gbm01819⟩. ⟨hal-02961998⟩



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