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首页> 外文OA文献 >Influence of Native Microbiota on Survival of Ralstonia solanacearum Phylotype II in River Water Microcosms▿
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Influence of Native Microbiota on Survival of Ralstonia solanacearum Phylotype II in River Water Microcosms▿

机译：原生微生物群对河水缩微中Ralstonia solanacearum Phylotype II存活的影响▿

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摘要

Ralstonia solanacearum phylotype II biovar 2 causes bacterial wilt in solanaceous hosts, producing severe economic losses worldwide. Waterways can be major dissemination routes of this pathogen, which is able to survive for long periods in sterilized water. However, little is known about its survival in natural water when other microorganisms, such as bacteriophages, other bacteria, and protozoa, are present. This study looks into the fate of a Spanish strain of R. solanacearum inoculated in water microcosms from a Spanish river, containing different microbiota fractions, at 24°C and 14°C, for a month. At both temperatures, R. solanacearum densities remained constant at the initial levels in control microcosms of sterile river water while, by contrast, declines in the populations of the introduced strain were observed in the nonsterile microcosms. These decreases were less marked at 14°C. Lytic bacteriophages present in this river water were involved in the declines of the pathogen populations, but indigenous protozoa and bacteria also contributed to the reduced persistence in water. R. solanacearum variants displaying resistance to phage infection were observed, but only in microcosms without protozoa and native bacteria. In water microcosms, the temperature of 14°C was more favorable for the survival of this pathogen than 24°C, since biotic interactions were slower at the lower temperature. Similar trends were observed in microcosms inoculated with a Dutch strain. This is the first study demonstrating the influence of different fractions of water microorganisms on the survival of R. solanacearum phylotype II released into river water microcosms.
机译：Ralstonia solanacearum phylotype II biovar 2在茄科宿主中引起细菌枯萎，在世界范围内造成严重的经济损失。水道可能是这种病原体的主要传播途径，该病原体能够在无菌水中长期生存。然而，当存在其他微生物，例如噬菌体，其他细菌和原生动物时，关于其在天然水中的存活知之甚少。这项研究调查了西班牙茄青枯菌的命运，该菌株在24℃和14℃下接种于一条来自西班牙河流的水微观世界中的命运，其中包含不同的微生物群组分，历时一个月。在两个温度下，青枯菌密度在无菌河水的对照微观中都保持在初始水平不变，相反，在非无菌微观中观察到引入菌株的种群下降。这些降低在14°C下不明显。该河水中存在的溶菌性噬菌体参与了病原体种群的减少，但是原生动物和细菌也导致了水中持久性的降低。观察到了对噬菌体感染具有抗性的青枯菌变种，但仅存在于没有原生动物和天然细菌的微观世界中。在水的微观世界中，14℃的温度比24℃的温度更有利于这种病原体的生存，因为在较低的温度下生物相互作用较慢。在接种荷兰菌株的微观世界中也观察到了类似的趋势。这是第一项研究，证明了不同比例的水微生物对释放到河水缩微中的青枯菌系统型II存活的影响。

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