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Xylem vessel-specific SND5 and its homologs regulate secondary wall biosynthesis through activating secondary wall NAC binding elements
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Xylem vessel-specific SND5 and its homologs regulate secondary wall biosynthesis through activating secondary wall NAC binding elements
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Xylem vessel-specific SND5 and its homologs regulate secondary wall biosynthesis through activating secondary wall NAC binding elements
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Journal Article
Xylem vessel-specific SND5 and its homologs regulate secondary wall biosynthesis through activating secondary wall NAC binding elements
2021
Overview
• Secondary cell wall biosynthesis has been shown to be regulated by a suite of transcription factors. Here, we identified a new xylem vessel-specific NAC domain transcription factor, secondary wall-associated NAC domain protein5 (SND5), in Arabidopsis thaliana and studied its role in regulating secondary wall biosynthesis.
• We showed that the expression of SND5 and its close homolog, SND4/ANAC075, was specifically associated with secondary wall-containing cells and dominant repression of their functions severely reduced secondary wall thickening in these cells. Overexpression of SND4/5 as well as their homologs SND2/3 fused with the activation domain of the viral protein VP16 led to ectopic secondary wall deposition in cells that are normally parenchymatous. SND2/3/4/5 regulated the expression of the same downstream target genes as do the secondary wall NAC master switches (SWNs) by binding to and activating the secondary wall NAC binding elements (SNBEs).
• Furthermore, we demonstrated that the poplar (Populus trichocarpa) orthologs of SND2/3/4/5 also activated SNBEs and regulated secondary wall biosynthesis during wood formation.
• Together, these findings indicate that SND2/3/4/5 and their poplar orthologs regulate the expression of secondary wall-associated genes through activating SNBEs and they are positioned at an upper level in the SWN-mediated transcriptional network.
Publisher
Wiley,Wiley Subscription Services, Inc,Wiley-Blackwell
