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WUSCHEL-RELATED HOMEOBOX 2 is a transcriptional repressor involved in lateral organ formation and separation in Arabidopsis.

ABSTRACT: In this study, we characterized the function of WUSCHEL-RELATED HOMEOBOX 2 (WOX2) using overexpression, CRES-T, and VP16 fusion techniques. Although the function of WOX2 has been described mainly in embryogenesis, it was unclear whether it also plays a role in the post-embryogenic developmental stage. We found that WOX2 has transcriptional repression activity and that either overexpression of WOX2 or expression of its chimeric repressor causes severe growth defects and other morphological phenotypes by impairing plant organ formation and separation. By contrast, VP16-fused WOX2-expressing plants did not display such severe phenotypic defects. In addition, some of them displayed phenotypic defects such as fusion of organs and induction of undifferentiated cells in the boundary regions of organs where GUS staining was clearly observed in the proWOX2:GUS transgenic plants. We suggest that WOX2 is involved in regulation of lateral organ formation and separation during the post-embryogenic development processes.

SUBMITTER: Chung K

PROVIDER: S-EPMC6565944 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature

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WUSCHEL-RELATED HOMEOBOX 2 is a transcriptional repressor involved in lateral organ formation and separation in <i>Arabidopsis</i>.

Chung KwiMi K Sakamoto Shingo S Mitsuda Nobutaka N Suzuki Kaoru K Ohme-Takagi Masaru M Fujiwara Sumire S

Plant biotechnology (Tokyo, Japan) 20160319 4

In this study, we characterized the function of WUSCHEL-RELATED HOMEOBOX 2 (WOX2) using overexpression, CRES-T, and VP16 fusion techniques. Although the function of WOX2 has been described mainly in embryogenesis, it was unclear whether it also plays a role in the post-embryogenic developmental stage. We found that WOX2 has transcriptional repression activity and that either overexpression of <i>WOX2</i> or expression of its chimeric repressor causes severe growth defects and other morphological ...[more]

PMID: 31274988

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Project description:BackgroundWUSCHEL (WUS)-related homeobox (WOX) protein family members play important roles in the maintenance and proliferation of the stem cell niche in the shoot apical meristem (SAM), root apical meristem (RAM), and cambium (CAM). Although the roles of some WOXs in meristematic cell regulation have been well studied in annual plants such as Arabidopsis and rice, the expression and function of WOX members in woody plant poplars has not been systematically investigated. Here, we present the identification and comprehensive analysis of the expression and function of WOXs in Populus tomentosa.ResultsA genome-wide survey identified 18 WOX encoding sequences in the sequenced genome of Populus trichocarpa (PtrWOXs). Phylogenetic and gene structure analysis revealed that these 18 PtrWOXs fall into modern/WUS, intermediate, and ancient clades, but that the WOX genes in P. trichocarpa may have expanded differently from the WOX genes in Arabidopsis. In the P. trichocarpa genome, no WOX members could be closely classified as AtWOX3, AtWOX6, AtWOX7, AtWOX10, and AtWOX14, but there were two copies of WOX genes that could be classified as PtrWUS, PtrWOX2, PtrWOX4, PtrWOX5, PtrWOX8/9, and PtrWOX11/12, and three copies of WOX genes that could be classified as PtrWOX1 and PtrWOX13. The use of primers specific for each PtrWOX gene allowed the identification and cloning of 18 WOX genes from P. tomentosa (PtoWOXs), a poplar species physiologically close to P. trichocarpa. It was found that PtoWOXs and PtrWOXs shared very high amino acid sequence identity, and that PtoWOXs could be classified identically to PtrWOXs. We revealed that the expression patterns of some PtoWOXs were different to their Arabidopsis counterparts. When PtoWOX5a and PtoWOX11/12a, as well as PtoWUSa and PtoWOX4a were ectopically expressed in transgenic hybrid poplars, the regeneration of adventitious root (AR) was promoted, indicating a functional similarity of these four WOXs in AR regeneration.ConclusionsThis is the first attempt towards a systematical analysis of the function of WOXs in P. tomentosa. A diversified expression, yet functional similarity of PtoWOXs in AR regeneration is revealed. Our findings provide useful information for further elucidation of the functions and mechanisms of WOXs in the development of poplars.

Dataset Information

WUSCHEL-RELATED HOMEOBOX 2 is a transcriptional repressor involved in lateral organ formation and separation in Arabidopsis.

Publications

WUSCHEL-RELATED HOMEOBOX 2 is a transcriptional repressor involved in lateral organ formation and separation in <i>Arabidopsis</i>.

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