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. 2022 Nov 25;13:1019266. doi: 10.3389/fpls.2022.1019266

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Copyright © 2022 Grover, Shinde, Puri, Palmer, Sarath, Sattler and Louis

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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Fall armyworm (FAW) feeding suppressed the accumulation of phenolic intermediates of the monolignol biosynthetic pathway in sorghum. (A) Principal component analysis (PCA) of soluble and cell-wall bound phenolic compounds quantified by GC-MS after 10 days of FAW infestation on RTx430, SC1345 and Ajabsido plants. FAW-uninfested plants were used as controls. (B–F) Relative abundances of intermediates of the monolignol biosynthetic pathway were determined by GC/MS analysis of soluble phenolics extracted from sorghum leaves. Peak area was normalized to the internal standards using 4-methyl cinnamic acid for soluble phenolics. The relative abundances of soluble (B) syringic acid, (C) p-coumaric acid, (D) ferulic acid, (E) caffeic acid, and (F) sinapic acid are presented (n = 4). Error bars represent ± SE. Different letters indicate significant difference relative to each other (P < 0.05).