Inhibition of Mushroom Formation and Induction of Glycerol Release—Ecological Strategies of Burkholderia terrae BS001 to Create a Hospitable Niche at the Fungus Lyophyllum sp. Strain Karsten
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- 作者：Rashid Nazir (1)
Jan A. Warmink (1)
David C. Voordes (1)
Henk H. van de Bovenkamp (1)
Jan Dirk van Elsas (1) - 刊名：Microbial Ecology
- 出版年：2013
- 出版时间：January 2013
- 年：2013
- 卷：65
- 期：1
- 页码：245-254
- 全文大小：480KB
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Jan A. Warmink (1)
David C. Voordes (1)
Henk H. van de Bovenkamp (1)
Jan Dirk van Elsas (1)
1. Department of Microbial Ecology, Centre for Ecological and Evolutionary Studies, University of Groningen, Linneausborg, Nijenborgh 7, 9747, Groningen, Netherlands - ISSN：1432-184X
文摘
We investigated the ecological strategies exerted by the soil bacterium Burkholderia terrae BS001 at the hyphae of the soil saprotrophic fungus Lyophyllum sp. strain Karsten. Recently, this bacterium has been reported to form biofilms around, and to comigrate with, growing hyphae of Lyophyllum sp. strain Karsten. In addition, it was found to be able to utilize fungal metabolites. Here, we extend this work to shed some light on the interactions between the bacterial and fungal partner which allow ecological success for the former. In standing liquid microcosms inoculated with Lyophyllum sp. strain Karsten, we detected, upon prolonged incubation, the formation of a mycelial mat at the liquid–air interface. From this mat, primordia were formed after 4-?weeks, which eventually resulted in mushrooms. However, upon addition of strain BS001 to the bulk liquid, mushroom formation from the fungal mat was clearly inhibited, as evidenced by (1) the formation of significantly lower numbers of primordia and (2) a delay of the onset of primordia formation. Moreover and importantly, the presence of strain BS001 caused the fungus to secrete large amounts of exudates at the mycelial mat, whereas such exudation was absent from control (uninoculated) or Escherichia coli K12- or Variovorax paradoxus BS64-inoculated microcosms. In the exudates, glycerol was the main carbonaceous component, and this compound could be easily utilized by strain BS001. Thus, in different experimental set-ups with the fungal partner, strain BS001 was shown to grow in the fungal exudates on the mat. The two fungal-interactive phenotypes were specific for B. terrae strain BS001, as the other bacteria used in our study, i.e. E. coli K12 and V. paradoxus BS64, did not exhibit any of these phenomena.