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. 2021 Nov 18;12:743795. doi: 10.3389/fpls.2021.743795

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Copyright © 2021 Wei, Tang, Jia, Zeng, Wang, Wu, Quan, Chen, Li and Wu.

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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Analysis of expression levels of lignin biosynthesis-related genes and lignin content and composition. (A,B) Stem cross slices stained with phloroglucinol-HCl (A) and Maüle staining method (B) in TRV:STTM397, TRV:OE-miR397, TRV:GhLAC4, and the control plants. The red boxes in up panels are enlarged as shown in down panels; the black arrow points to lignin fibres. Scale bars in (A) is 0.35 mm, (B) scale bars is 500 μm. (C) The relative expression levels of lignin biosynthesis-related genes in TRV:STTM397, TRV:OE-miR397, TRV:GhLAC4, and the control plants. (D) Analysis of Klason lignin content in TRV:STTM397, TRV:OE-miR397, TRV:GhLAC4, and the control plants. (E) Determination of the main H, G, and S thioacidolysis monomers released by the lignins of extract-free mature stems of laccase in TRV:STTM397, TRV:OE-miR397, TRV:GhLAC4, and the control plants. (F) S/G molar ratio in in TRV:STTM397, TRV:OE-miR397, TRV:GhLAC4, and the control plants. Mean with SD comes from triple repeats experiments. Different letters in (C,D,F) indicate significant difference (P < 0.05) based on Tukey’s HSD test.