Functional Characterization of Populus PsnSHN2 in Coordinated Regulation of Secondary Wall Components in Tobacco

Liu, Yingying; Wei, Minjing; Hou, Cong; Lu, Tingting; Liu, Lulu; Wei, Hairong; Cheng, Yuxiang; Wei, Zhigang

doi:10.1038/s41598-017-00093-z

Cited by 39 publications

(35 citation statements)

References 61 publications

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“…Despite this work the role of ERFs-mediated ethylene signaling in the SCW regulatory network remains elusive (Figure 1 ). Liu et al (2017) reported that Populus ERF type TF, PsnSHN2 , is predominantly expressed in xylem tissues, and that it positively regulates cellulose and hemicellulose biosynthesis but negatively regulates lignin biosynthesis. Recently, Seyfferth et al (2018) constructed an ethylene-related gene expression network during SCW formation, ETHYLENE INSENSITIVE 3D ( EIN3D ) and 11 ERFs were identified as hub genes.…”

Section: Ethylene Related Tfs In Scw Biosynthesismentioning

confidence: 99%

Recent Advances in the Transcriptional Regulation of Secondary Cell Wall Biosynthesis in the Woody Plants

et al. 2018

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Plant cell walls provide structural support for growth and serve as a barrier for pathogen attack. Plant cell walls are also a source of renewable biomass for conversion to biofuels and bioproducts. Understanding plant cell wall biosynthesis and its regulation is of critical importance for the genetic modification of plant feedstocks for cost-effective biofuels and bioproducts conversion and production. Great progress has been made in identifying enzymes involved in plant cell wall biosynthesis, and in Arabidopsis it is generally recognized that the regulation of genes encoding these enzymes is under a transcriptional regulatory network with coherent feedforward and feedback loops. However, less is known about the transcriptional regulation of plant secondary cell wall (SCW) biosynthesis in woody species despite of its high relevance to biofuels and bioproducts conversion and production. In this article, we synthesize recent progress on the transcriptional regulation of SCW biosynthesis in Arabidopsis and contrast to what is known in woody species. Furthermore, we evaluate progress in related emerging regulatory machineries targeting transcription factors in this complex regulatory network of SCW biosynthesis.

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Section: Ethylene Related Tfs In Scw Biosynthesismentioning

confidence: 99%

Recent Advances in the Transcriptional Regulation of Secondary Cell Wall Biosynthesis in the Woody Plants

et al. 2018

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“…On the other hand, overexpression of another member of the AP2/ERF family, PsnSHINE2 from P. simonii 3 P. nigra, in tobacco represses the expression of MYB and NAC activators of the lignin pathway, leading to reduced lignin content in stems [24]. PsnSHINE2 binds not only to the AP2/ ERF binding box but also to a secondary wall NAC binding element (SNBE, motif TCCTTTTCTCTCTAAGCAT) and to three MYB-binding elements (SMBEs; motifs ACCAAAT, ACCTACC, and ACCAACC) [24] that are present in the promoters of lignin, xylan, and cellulose biosynthetic genes (Table 1) [55]. AP2/ERF are therefore able to regulate the lignin biosynthetic pathway both directly and indirectly.…”

Section: R2r3 Mybs the Gatekeepers Of Scw Formation And Lignificationmentioning

confidence: 99%

A Molecular Blueprint of Lignin Repression

Behr¹,

Guerriero²,

Grima‐Pettenati³

et al. 2019

Trends in Plant Science

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Although lignin is essential to ensure the correct growth and development of land plants, it may be an obstacle to the production of lignocellulosics-based biofuels, and reduces the nutritional quality of crops used for human consumption or livestock feed. The need to tailor the lignocellulosic biomass for more efficient biofuel production or for improved plant digestibility has fostered considerable advances in our understanding of the lignin biosynthetic pathway and its regulation. Most of the described regulators are transcriptional activators of lignin biosynthesis, but considerably less attention has been devoted to the repressors of this pathway. We provide a comprehensive overview of the molecular factors that negatively impact on the lignification process at both the transcriptional and post-transcriptional levels. Challenging LigninLignin is a major cell wall component that fulfills fundamental functions in plant development as well as in defense against pests and pathogens. This heteropolymer impregnates the compound middle lamella and the secondary cell walls (SCWs) of cells genetically programmed to be lignified, such as xylem tracheary elements as well as xylem and phloem fibers. Lignin biosynthesis spans the phenylpropanoid and the monolignol pathways, from phenylalanine to p-coumaryl, coniferyl, and sinapyl alcohols. Monolignol homeostasis is regulated through a balance between the molecular factors that antagonistically regulate their biosynthesis. After monolignols are excreted into the apoplast, they are oxidized by the phenol-oxidoreductase laccases and/or by class III peroxidases, and are polymerized by radical coupling. A complex regulatory network involving phytohormones, transcription factors (TFs), and post-transcriptional events guide SCW deposition and lignification [1]. This network prevents lignin deposition in tissues undergoing active division or elongation such as apical meristems, vascular cambium, and immature xylem cells, as well as in non-lignified tissues such as stem pith and flax or hemp bast fibers that harbor gelatinous walls under normal developmental conditions. Similarly, this network negatively regulates lignification in xylem tissue formed in response to mechanical stresses such as, for instance, poplar tension wood that harbors hypolignified gelatinous walls.

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“…SHN transcription factors are involved in regulating cutin, suberin, and wax protein levels in Arabidopsis (Licausi, Ohme-Takagi, & Perata, 2013;Shi et al, 2011), and the poplar (Populus spp.) SHN2 has been shown to regulate secondary cell wall formation in tobacco (Nicotiana tabacum) transformants (Liu et al, 2017). Several nodes were identified as genes encoding proteins involved in cellular processes.…”

Section: Gene Regulatory Network (Grn)mentioning

confidence: 99%

Field‐grown soybean transcriptome shows diurnal patterns in photosynthesis‐related processes

2018

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Many plant physiological processes have diurnal patterns regulated by diurnal environmental changes and circadian rhythms, but the transcriptional underpinnings of many of these cycles have not been studied in major crop species under field conditions. Here, we monitored the transcriptome of field‐grown soybean ( Glycine max ) during daylight hours in the middle of the growing season with RNA ‐seq. The analysis revealed 21% of soybean genes were differentially expressed over the course of the day. Expression of some circadian‐related genes in field‐grown soybean differed from previously reported expression patterns measured in controlled environments. Many genes in functional groups contributing to and/or depending on photosynthesis showed differential expression, with patterns particularly evident in the chlorophyll synthesis pathway. Gene regulatory network inference also revealed seven diurnally sensitive gene nodes involved with circadian rhythm, transcription regulation, cellular processes, and water transport. This study provides a diurnal overview of the transcriptome for an economically important field‐grown crop and a basis for identifying pathways that could eventually be tailored to optimize diurnal regulation of carbon gain.

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Functional Characterization of Populus PsnSHN2 in Coordinated Regulation of Secondary Wall Components in Tobacco

Cited by 39 publications

References 61 publications

Recent Advances in the Transcriptional Regulation of Secondary Cell Wall Biosynthesis in the Woody Plants

Recent Advances in the Transcriptional Regulation of Secondary Cell Wall Biosynthesis in the Woody Plants

A Molecular Blueprint of Lignin Repression

Field‐grown soybean transcriptome shows diurnal patterns in photosynthesis‐related processes

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