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. 2022 Aug 25;13:971836. doi: 10.3389/fmicb.2022.971836

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Copyright © 2022 Mashabela, Tugizimana, Steenkamp, Piater, Dubery and Mhlongo.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Comprehensive metabolic pathways analysis and metabolome view. (A) A heatmap displaying differential quantitative alterations in the concentrations of the selected phenylpropanoids. The heatmap show the up/down-regulation of some phenolic compounds in the plant growth-promoting rhizobacteria (PGPR)-treated and untreated wheat cultivars, an indication of the potential impact of PGPR treatment on secondary metabolite biosynthesis and the regulation of the secondary metabolic pathway. (B) Topology map of the phenylpropanoid biosynthesis pathway, indicating the integration of precursor molecules (tyrosine, phenylalanine, and tryptophan) at differentially altered quantification levels at under different conditions. GB (Blue) = Gariep_B. sub, GP (yellow) = Gariep_P. alvei, KB (red) = Koonap_B. sub, KP (orange) = Koonap_P. alvei. Green bars represent untreated samples for the respective cultivars. The end products of the phenylpropanoid biosynthesis pathways are indicated in red demarcations as lignins.