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首页> 外文期刊>Plant and Soil >Azospirillum brasilense colonisation of wheat roots and the role of lectin–carbohydrate interactions in bacterial adsorption and root-hair deformation
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Azospirillum brasilense colonisation of wheat roots and the role of lectin–carbohydrate interactions in bacterial adsorption and root-hair deformation

机译：巴西根霉菌在小麦根部的定殖及其凝集素-碳水化合物相互作用在细菌吸附和根毛变形中的作用

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摘要

The dynamics of adsorption of the nitrogen-fixing soil bacteria Azospirillum brasilense 75 and 80 (isolated from soil samples collected in Saratov Oblast, southern Russia) and A. brasilense Sp245 to the roots of seedlings of common spring wheat was studied in relation to inoculum size, period of incubation with the roots and bacterial-growth phase. The number of root-attached cells increased with increasing size of inoculum and time of contact. The saturation of root-surface adsorption was observed by 24 h of co-incubation for A. brasilense 75, by 6 h for A. brasilense 80, and by 3 h for A. brasilense Sp245. The firmness of bacterial–root attachment increased after extended co-incubation. Differences in the adsorption kinetics of the azospirilla were found that were associated with bacterial-growth phases. Azospirilla attached to the roots of their host cultivar more actively than they did to the roots of a non-host cultivar. Adsorption was partially inhibited when the roots were treated with N-acetyl-D-glucosamine. Maximal inhibition occurred after a 3-h exposure of the roots to the bacteria. Root-hair deformation induced with polysaccharide-containing complexes from the Azospirillum capsular material was inhibited by N-acetyl-D-glucosamine and chitotriose, specific haptens of wheat germ agglutinin. A possible mechanism of the mutual influence of bacteria and plants may involve key roles of wheat germ agglutinin, present on the roots, and the polysaccharide-containing components of the Azospirillum capsule.
机译：研究了固氮土壤细菌巴西细杆菌Azospirillum brasilense 75和80（从俄罗斯南部萨拉托夫州采集的土壤样品中分离）和巴西柔弱菌Sp245对普通春小麦幼苗根部的吸附动力学，与接种量有关。 ，与根和细菌生长阶段的潜伏期。根附着细胞的数量随接种物大小和接触时间的增加而增加。共同孵育巴西布鲁氏杆菌75 24小时，巴西布鲁氏杆菌80 6小时和巴西布鲁氏菌Sp245 3小时共同观察到根表面吸附的饱和。长时间共孵育后细菌根系附着的牢固性增加。发现偶氮螺旋藻的吸附动力学差异与细菌生长阶段有关。偶氮螺旋藻比非宿主品种的根更积极地附着于宿主品种的根。当根用N-乙酰基-D-葡萄糖胺处理时，吸附被部分抑制。根部暴露于细菌3小时后产生最大抑制作用。 N-乙酰基-D-葡糖胺和壳三糖（小麦胚芽凝集素的特定半抗原）抑制了来自固氮螺菌荚膜材料的含多糖复合物诱导的根毛变形。细菌和植物相互影响的可能机制可能涉及存在于根部的小麦胚芽凝集素的关键作用，以及固氮螺菌胶囊的含多糖成分。

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