Metabolomics and Transcriptomics Identify Multiple Downstream Targets of Paraburkholderia phymatum σ⁵⁴ During Symbiosis with Phaseolus vulgaris.

Several of the genes that showed RpoN-dependent expression in root nodules also contained a highly significant ( p -value ≤ 6.58 × 10 −5 ) RpoN binding sequence in their promoter region: the promoter of Bphy_0256, coding for nitrogen regulatory protein P-II ( glnB1 ), which is localized upstream of the ammonium transporter gene ( amtB ) ( Figure 3 A, Table 3 ); the promoter of the glutamine synthetase encoding gene (Bphy_1481, glnA ); followed by two genes of the 2CRS NtrBC ( Figure 3 B), which were also present among the 322 top down-regulated genes.

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