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首页> 外文期刊>Journal of bacteriology >Strain-specific chemotaxis of Azospirillum spp.
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Strain-specific chemotaxis of Azospirillum spp.

机译：固氮螺旋菌属菌株的特定趋化性。

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Chemotactic responses of three Azospirillum strains originating from different host plants were compared to examine the possible role of chemotaxis in the adaptation of these bacteria to their respective hosts. The chemotaxis to several sugars, amino acids, and organic acids was determined qualitatively by an agar plate assay and quantitatively by a channeled-chamber technique. High chemotactic ratios, up to 40, were obtained with the latter technique. The chemotactic response did not rely upon the ability of the bacteria to metabolize the attractant. Rather, it depended on the attractant concentration and stereoconfiguration. Chemotaxis was found to be strain specific. Differences were particularly observed between a wheat isolate and strains originating from the C4-pathway plants maize and Leptochloa fusca. In contrast to the other two strains, the wheat isolate was strongly attracted to D-fructose, L-aspartate, citrate, and oxalate. The other strains showed maximal attraction to L-malate. The chemotactic responses to organic acids partially correlate with the exudation of these acids by the respective host plants. Additionally, a heat-labile, high-molecular-weight attractant was found in the root exudates of L. fusca, which specifically attracted the homologous Azospirillum strain. It is proposed that strain-specific chemotaxis probably reflects an adaptation of Azospirillum spp. to the conditions provided by the host plant and contributes to the initiation of the association process.
机译：比较了来自不同宿主植物的三种固氮螺菌菌株的趋化反应，以检查趋化作用在这些细菌适应其各自宿主中的可能作用。对几种糖，氨基酸和有机酸的趋化性通过琼脂平板测定定性确定，并通过通道室技术定量测定。使用后一种技术可获得高达40的高趋化比。趋化反应不依赖于细菌代谢引诱剂的能力。相反，它取决于引诱剂的浓度和立体构型。发现趋化性是菌株特异性的。特别是在小麦分离株和源自C4途径植物玉米和Leptochloa fusca的菌株之间观察到差异。与其他两个菌株相反，小麦分离株被D-果糖，L-天冬氨酸，柠檬酸和草酸强烈吸引。其他菌株显示出对L-苹果酸的最大吸引力。对有机酸的趋化反应与各个宿主植物对这些酸的渗出部分相关。此外，在L. fusca的根系分泌物中发现了对热不稳定的高分子量引诱剂，该引诱剂特别吸引了同源的拟螺旋体菌株。有人提出，特定菌株的趋化性可能反映了拟螺旋体属的适应性。适应寄主植物提供的条件，并有助于启动关联过程。

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