The plant microbiota may differ depending on soil type, but these microbiota probably share the same functions necessary for holobiont fitness. Thus, we tested the hypothesis that phytostimulatory microbial functional groups are likely to co-occur in the rhizosphere, using groups corresponding to nitrogen fixation (nifH) and 1-aminocyclopropane-1-carboxylate deamination (acdS), i.e. two key modes of action in plant-beneficial rhizobacteria. The analysis of three maize fields in two consecutive years showed that quantitative PCR numbers of nifH and of acdS alleles differed according to field site, but a positive correlation was found overall when comparing nifH and acdS numbers. Metabarcoding analyses in the second year indicated that the diversity level of acdS but not nifH rhizobacteria in the rhizosphere differed across fields. Furthermore, between-class analysis showed that the three sites differed from one another based on nifH or acdS sequence data (or rrs data), and the bacterial genera contributing most to field differentiation were not the same for the three bacterial groups. However, co-inertia analysis indicated that the genetic structures of both functional groups and of the whole bacterial community were similar across the three fields. Therefore, results point to co-selection of rhizobacteria harboring nitrogen fixation and/or 1-aminocyclopropane-1-carboxylate deamination abilities.

中文翻译：

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玉米根际同时存在固氮和/或1-氨基环丙烷-1-羧酸盐脱氨能力的根际细菌。

植物微生物群可能会因土壤类型而异，但是这些微生物群可能具有相同的功能，适合全生命周期适应。因此，我们使用对应于固氮（nifH）和1-氨基环丙烷-1-羧酸酯脱氨（acdS）的基团，即两种主要的作用方式，验证了植物刺激性微生物官能团可能在根际共生的假设。植物有益的根际细菌。连续两年对三个玉米田的分析表明，nifH和acdS等位基因的定量PCR数量因田地而异，但在比较nifH和acdS数量时总体上发现正相关。第二年的元条形码分析表明，根际中acdS的多样性水平而非根际的nifH根际细菌有所不同。此外，类间分析表明，根据nifH或acdS序列数据（或rrs数据），这三个位点彼此不同，并且对这三个细菌群而言，促成田间分化的细菌属最不相同。但是，共惯性分析表明，在这三个领域中，两个功能组和整个细菌群落的遗传结构都相似。因此，结果表明具有氮固定和/或1-氨基环丙烷-1-羧酸盐脱氨基能力的根瘤菌的共选。共同惯性分析表明，在这三个领域中，两个功能组和整个细菌群落的遗传结构都相似。因此，结果表明具有氮固定和/或1-氨基环丙烷-1-羧酸盐脱氨基能力的根瘤菌的共选。共同惯性分析表明，在这三个领域中，两个功能组和整个细菌群落的遗传结构都相似。因此，结果表明具有氮固定和/或1-氨基环丙烷-1-羧酸盐脱氨基能力的根瘤菌的共选。