HD-Zip III Homeobox Genes that Include a Novel Member, ZeHB-13 (Zinnia)/ATHB-15 (Arabidopsis), are Involved in Procambium and Xylem Cell Differentiation

Ohashi-Ito, Kyoko; Fukuda, Hiroo

doi:10.1093/pcp/pcg164

Cited by 153 publications

(123 citation statements)

References 33 publications

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“…This is consistent with a previous work on ICU4/ATHB15 and its Zinnia elegans ortholog ZeHB-13, indicating that both genes are expressed in procambial cells, and suggesting that they might function in the differentiation or maintenance of these cells (Ohashi-Ito and Fukuda, 2003). Thus, homozygous plants for the semidominant gain-of-function icu4-1 allele, which disrupts the negative control of ICU4 by miR165/166, overexpress the gene (Ochando et al, 2006), and show more than twice the procambium, and a consequent increase of phloem and xylem, compared with the wild-type, supporting the notion that ICU4 promotes vascular development, as proposed for ATHB8, its closest paralog .…”

Section: Discussionsupporting

confidence: 93%

Alteration of the shoot radial pattern in Arabidopsis thaliana by a gain-of-function allele of the class III HD-Zip gene INCURVATA4

Ochando¹,

González-Reig²,

Ripoll³

et al. 2008

Int. J. Dev. Biol.

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Section: Discussionsupporting

confidence: 93%

Alteration of the shoot radial pattern in Arabidopsis thaliana by a gain-of-function allele of the class III HD-Zip gene INCURVATA4

Ochando¹,

González-Reig²,

Ripoll³

et al. 2008

Int. J. Dev. Biol.

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“…The 450-bp sequence upstream of TERE in the XCP1 promoter showed lower enrichment than did the XCP1 promoter that included TERE. By contrast, the ATHB-15/CNA promoter, which directs procambium-specific expression of genes (Ohashi- Ito and Fukuda, 2003) and does not contain TERE, was not enriched in an extract from VND6-YFP-overexpressing cells (Figure 6). These findings suggest that VND6 binds to TERE and directly upregulates TE-specific genes related to not only transcription factors but also enzymes for both PCD and secondary wall formation.…”

Section: Tere Is a Direct Target Of Vnd6mentioning

confidence: 97%

Arabidopsis VASCULAR-RELATED NAC-DOMAIN6 Directly Regulates the Genes That Govern Programmed Cell Death and Secondary Wall Formation during Xylem Differentiation

2010

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Xylem consists of three types of cells: tracheary elements (TEs), parenchyma cells, and fiber cells. TE differentiation includes two essential processes, programmed cell death (PCD) and secondary cell wall formation. These two processes are tightly coupled. However, little is known about the molecular mechanisms underlying these processes. Here, we show that VASCULAR-RELATED NAC-DOMAIN6 (VND6), a master regulator of TEs, regulates some of the downstream genes involved in these processes in a coordinated manner. We first identified genes that are expressed downstream of VND6 but not downstream of SECONDARY WALL-ASSOCIATED NAC DOMAIN PROTEIN1 (SND1), a master regulator of xylem fiber cells, using transformed suspension culture cells in microarray experiments. We found that VND6 and SND1 governed distinct aspects of xylem formation, whereas they regulated a number of genes in common, specifically those related to secondary cell wall formation. Genes involved in TE-specific PCD were upregulated only by VND6. Moreover, we revealed that VND6 directly regulated genes that harbor a TE-specific cis-element, TERE, in their promoters. Thus, we found that VND6 is a direct regulator of genes related to PCD as well as to secondary wall formation.

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“…Physiological studies have demonstrated that BR can induce diverse cellular responses such as stem elongation, pollen tube growth, leaf bending and epinasty, root inhibition, induction of ethylene biosynthesis and fruit ripening, and xylem differentiation [3][4][5][6]. The identification of Arabidopsis BR biosynthetic mutants established that BR is a new class of phytohormone with an essential role in plant growth and development [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

The brassinosteroid signal transduction pathway

Wang

Chong

et al. 2006

Cell Res

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Steroids function as signaling molecules in both animals and plants. While animal steroid hormones are perceived by nuclear receptor family of transcription factors, brassinosteroids (BR) in plants are perceived by a cell surface receptor kinase, BRI1. Recent studies have demonstrated that BR binding to the extracellular domain of BRI1 induces kinase activation and dimerization with another receptor kinase, BAK1. Activated BRI1 or BAK1 then regulate, possibly indirectly, the activities of BIN2 kinase and/or BSU1 phosphatase, which directly regulate the phosphorylation status and nuclear accumulation of two homologous transcription factors, BZR1 and BES1. BZR1 and BES1 directly bind to promoters of BR responsive genes to regulate their expression. The BR signaling pathway has become a paradigm for both receptor kinase signaling in plants and steroid signaling by cell surface receptors in general.

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HD-Zip III Homeobox Genes that Include a Novel Member, ZeHB-13 (Zinnia)/ATHB-15 (Arabidopsis), are Involved in Procambium and Xylem Cell Differentiation

Cited by 153 publications

References 33 publications

Alteration of the shoot radial pattern in Arabidopsis thaliana by a gain-of-function allele of the class III HD-Zip gene INCURVATA4

Alteration of the shoot radial pattern in Arabidopsis thaliana by a gain-of-function allele of the class III HD-Zip gene INCURVATA4

Arabidopsis VASCULAR-RELATED NAC-DOMAIN6 Directly Regulates the Genes That Govern Programmed Cell Death and Secondary Wall Formation during Xylem Differentiation

The brassinosteroid signal transduction pathway

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