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首页> 外文期刊>Applied Microbiology >Casuarina Root Exudates Alter the Physiology, Surface Properties, and Plant Infectivity of Frankia sp. Strain CcI3
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Casuarina Root Exudates Alter the Physiology, Surface Properties, and Plant Infectivity of Frankia sp. Strain CcI3

机译：木麻黄根分泌物会改变Frankia sp。的生理，表面特性和植物感染性。 CcI3菌株

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The actinomycete genus Frankia forms nitrogen-fixing symbioses with 8 different families of actinorhizal plants, representing more than 200 different species. Very little is known about the initial molecular interactions between Frankia and host plants in the rhizosphere. Root exudates are important in Rhizobium -legume symbiosis, especially for initiating Nod factor synthesis. We measured differences in Frankia physiology after exposure to host aqueous root exudates to assess their effects on actinorhizal symbioses. Casuarina cunninghamiana root exudates were collected from plants under nitrogen-sufficient and -deficient conditions and tested on Frankia sp. strain CcI3. Root exudates increased the growth yield of Frankia in the presence of a carbon source, but Frankia was unable to use the root exudates as a sole carbon or energy source. Exposure to root exudates caused hyphal “curling” in Frankia cells, suggesting a chemotrophic response or surface property change. Exposure to root exudates altered Congo red dye binding, which indicated changes in the bacterial surface properties at the fatty acid level. Fourier transform infrared spectroscopy (FTIR) confirmed fatty acid changes and revealed further carbohydrate changes. Frankia cells preexposed to C. cunninghamiana root exudates for 6 days formed nodules on the host plant significantly earlier than control cells. These data support the hypothesis of early chemical signaling between actinorhizal host plants and Frankia in the rhizosphere.
机译：放线菌属Frankia与8个不同的放线h植物科形成固氮共生酶，代表200多种不同的物种。关于Frankia与根际寄主植物之间的初始分子相互作用的了解甚少。根系分泌物在根瘤菌-豆类共生中很重要，特别是对于启动Nod因子合成。我们测量了暴露于宿主根系根分泌液后Frankia生理的差异，以评估它们对放线菌共生的影响。在氮充足和不足的条件下，从植物中收集木麻黄根分泌物，并在Frankia sp。上进行测试。菌株CcI3。在有碳源的情况下，根系分泌物增加了Frankia的生长产量，但是Frankia无法将根系分泌物用作唯一的碳或能源。暴露于根系分泌物会导致Frankia细胞出现菌丝“卷曲”，提示化学营养反应或表面性质改变。暴露于根系分泌物会改变刚果红染料的结合，这表明在脂肪酸水平细菌表面特性发生了变化。傅里叶变换红外光谱（FTIR）确认了脂肪酸的变化，并揭示了碳水化合物的进一步变化。预先暴露于C. cunninghamiana根分泌物中的Frankia细胞比对照细胞早得多地在宿主植物上形成根瘤。这些数据支持了放线菌宿主植物和根际弗兰基亚之间早期化学信号传递的假说。

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