Qualitative and quantitative estimation of phenolic compounds was done through reverse phase-high performance liquid chromatography (RP-HPLC) from different parts (leaf, stem, and root) of rice plants after inoculation with two rhizobial strains, RRE6 (Rhizobium leguminosarum bv. phaseoli) and ANU 843 (R. leguminosarum bv. trifolii) and infection by Rhizoctonia solani. On the basis of their retention time, the major phenolic acids detected in HPLC analysis were gallic, tannic, ferulic, and cinnamic acids. Furthermore, in all Rhizobium-inoculated rice plants, synthesis of phenolic compounds was more consistently enhanced than in control (uninoculated plants), where the maximum accumulation of phenolic compounds was observed in plants inoculated with RRE6 and infection with R. solani. Under pathogenic stress, RRE6 performed better because a relatively higher amount of phenolics was induced as compared with plants treated with ANU 843. Phenolic acids mediate induced systemic resistance and provide bioprotection to plants during pathogenic stresses. In addition, both rhizobial strains promote growth and productivity of rice plants in greenhouse conditions. This report on Rhizobium-mediated defense responses and growth promotion of nonlegume (such as rice) provides a novel paradigm of symbiotic plant-microbe interaction.

译文

在接种了两个根瘤菌菌株后,通过反相高效液相色谱 (rp-hplc) 从水稻植物的不同部位 (叶,茎和根) 进行酚类化合物的定性和定量估计,RRE6 (豆科根瘤菌) 和ANU 843 (豆科根瘤菌) 和茄科根瘤菌的感染。根据保留时间,HPLC分析中检测到的主要酚酸为没食子酸,鞣酸,阿魏酸和肉桂酸。此外,在所有接种根瘤菌的水稻植物中,酚类化合物的合成比对照 (未接种植物) 更一致地增强,在对照中,在接种RRE6和感染R. solani的植物中观察到酚类化合物的最大积累。在致病性胁迫下,RRE6表现更好,因为与用ANU 843处理的植物相比,诱导了相对更高量的酚类物质。酚酸介导诱导的系统抗性,并在致病胁迫期间为植物提供生物保护。此外,在温室条件下,两种根瘤菌菌株均可促进水稻植物的生长和生产力。这份关于根瘤菌介导的防御反应和非豆类 (如水稻) 的生长促进的报告提供了一种共生植物-微生物相互作用的新范式。

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