The MYB46/MYB83-mediated transcriptional regulatory programme is a gatekeeper of secondary wall biosynthesis

Ko, Jae‐Heung; Jeon, Hyung‐Woo; Kim, W.-C.; Kim, J.-Y.; Han, Kyung Hwan

doi:10.1093/aob/mcu126

Cited by 164 publications

(124 citation statements)

References 90 publications

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“…Both ZmMYB42 and ZmMYB31 (which did not colocalized with any IVNDFD QTL in the current set of progenies), were shown to have a repressive effect on several genes of the maize lignin pathway [120][121][122]. The ZmMYB146 gene (G31 group), which closely colocalized in bin 10.03 with the IVNDFD QTL having the highest Lod value (Lod = 13.7), is the only maize ortholog of the two Arabidopsis AtMYB46 and AtMYB83 paralogs, which were shown to be the master genes regulating as activator numerous genes involved in the secondary wall biosynthesis [123][124][125][126] . Orthologs of AtMYB46 and AtMYB83 have also been shown with similar roles in woody plants such as EgMYB2 in Eucalyptus, PtMYB4 in pine, or PtrMYB2/3/20/21 in poplar [127][128][129].…”

Section: Monolignol Myb and Nac Genes As Possible Primary Determinamentioning

confidence: 99%

Breeding maize for silage and biofuel production, an illustration of a step forward with the genome sequence

et al. 2016

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Section: Monolignol Myb and Nac Genes As Possible Primary Determinamentioning

confidence: 99%

Breeding maize for silage and biofuel production, an illustration of a step forward with the genome sequence

et al. 2016

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“…], Rengel et al, 2009) and studies in the in vitro system (Demura et al, 2002;Ohashi-Ito et al, 2010;Zhong et al, 2010;Yamaguchi et al, 2011) have identified many genes involved in xylem cell differentiation. These include VND family genes and SCW-related genes encoding MYB transcription factors (McCarthy et al, 2010;Ko et al, 2012Ko et al, , 2014Zhong and Ye, 2012;Hussey et al, 2013); based on this information, NAC-MYB-based transcriptional networks have been proposed for xylem vessel cell differentiation . Moreover, proteome data have been reported for xylem tissues of hybrid aspen (Populus spp.…”

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confidence: 99%

Primary Metabolism during Biosynthesis of Secondary Wall Polymers of Protoxylem Vessel Elements

et al. 2016

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Xylem vessels, the water-conducting cells in vascular plants, undergo characteristic secondary wall deposition and programmed cell death. These processes are regulated by the VASCULAR-RELATED NAC-DOMAIN (VND) transcription factors. Here, to identify changes in metabolism that occur during protoxylem vessel element differentiation, we subjected tobacco (Nicotiana tabacum) BY-2 suspension culture cells carrying an inducible VND7 system to liquid chromatography-mass spectrometry-based wide-target metabolome analysis and transcriptome analysis. Time-course data for 128 metabolites showed dynamic changes in metabolites related to amino acid biosynthesis. The concentration of glyceraldehyde 3-phosphate, an important intermediate of the glycolysis pathway, immediately decreased in the initial stages of cell differentiation. As cell differentiation progressed, specific amino acids accumulated, including the shikimate-related amino acids and the translocatable nitrogen-rich amino acid arginine. Transcriptome data indicated that cell differentiation involved the active up-regulation of genes encoding the enzymes catalyzing fructose 6-phosphate biosynthesis from glyceraldehyde 3-phosphate, phosphoenolpyruvate biosynthesis from oxaloacetate, and phenylalanine biosynthesis, which includes shikimate pathway enzymes. Concomitantly, active changes in the amount of fructose 6-phosphate and phosphoenolpyruvate were detected during cell differentiation. Taken together, our results show that protoxylem vessel element differentiation is associated with changes in primary metabolism, which could facilitate the production of polysaccharides and lignin monomers and, thus, promote the formation of the secondary cell wall. Also, these metabolic shifts correlate with the active transcriptional regulation of specific enzyme genes. Therefore, our observations indicate that primary metabolism is actively regulated during protoxylem vessel element differentiation to alter the cell's metabolic activity for the biosynthesis of secondary wall polymers.

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“…MYB83 is a close homolog of and acts redundantly with MYB46. MYB46/MYB83 transcription factors are master regulators of secondary cell wall formation in Arabidopsis, directly regulating expression of genes involved in lignin, cellulose and hemicellulose biosynthesis, including among others, SND1, CESA4 , CESA7, CESA8 , MYB58, MYB56, and MYB63 (Mccarthy et al, 2009; Ko et al, 2014). Thus, MYB83 appears to be a key component of cell wall modifications in downstream (late) plant defense responses.…”

Section: Discussionmentioning

confidence: 99%

RNA-seq Profiling Reveals Defense Responses in a Tolerant Potato Cultivar to Stem Infection by Pectobacterium carotovorum ssp. brasiliense

et al. 2016

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Pectobacterium carotovorum subsp. brasiliense is a member of the soft rot Enterobacteriaceae (SRE) family that causes tuber soft rot and blackleg diseases of stems in potato plants. Currently, there are no effective chemical strategies for the control of members of the SRE. Thus, an understanding of the inducible defense responses in stems of potato plants is important, particularly during colonization of the vascular system. Here, time-course RNA-sequencing analysis was used to compare expressed genes between a susceptible potato cultivar (Solanum tuberosum cv Valor) and a tolerant cultivar (S. tuberosum cv BP1) at 0, 6, 12, 24, and 72 h post-inoculation with P. c. brasiliense. In total, we identified 6139 and 8214 differentially expressed genes (DEGs) in the tolerant and susceptible cultivars, compared to mock-inoculated controls, respectively. Key DEGs distinguishing between tolerance and susceptibility were associated with negative regulation of cell death and plant-type cell wall organization/biogenesis biological processes in the tolerant and susceptible cultivars, respectively. Among these were DEGs involved in signaling (mainly MAPK cascade and ethylene pathway), defense-related transcription regulation including WRKY transcription factors, and downstream secondary cell biosynthesis. Together, our results suggest that S. tuberosum cv BP1 likely employs quantitative defense response against P. c. brasiliense. Overall, our study provides the first transcriptome-wide insight into the molecular basis of tolerance and/or resistance of potato stems to SRE infection.

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The MYB46/MYB83-mediated transcriptional regulatory programme is a gatekeeper of secondary wall biosynthesis

Cited by 164 publications

References 90 publications

Breeding maize for silage and biofuel production, an illustration of a step forward with the genome sequence

Breeding maize for silage and biofuel production, an illustration of a step forward with the genome sequence

Primary Metabolism during Biosynthesis of Secondary Wall Polymers of Protoxylem Vessel Elements

RNA-seq Profiling Reveals Defense Responses in a Tolerant Potato Cultivar to Stem Infection by Pectobacterium carotovorum ssp. brasiliense

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