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Published on: December 14, 2015
Class III homeodomain leucine-zipper proteins regulate xylem cell differentiation
Kyoko Ohashi-Ito1, Minoru Kubo, Taku Demura
1Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Japan. koito@stanford.edu
Zinnia homeodomain leucine-zipper III (HD-Zip III) genes, ZeHB-10 and ZeHB-12, influence vascular development. ZeHB-12 specifically promotes xylem parenchyma cell differentiation, not tracheary element formation.
Area of Science:
- Plant Biology
- Molecular Biology
- Genetics
Background:
- Class III homeodomain leucine-zipper (HD-Zip III) proteins are implicated in vascular development.
- The precise roles of individual HD-Zip III proteins in vascular differentiation remain unclear.
Purpose of the Study:
- To elucidate the specific functions of Zinnia HD-Zip III genes (ZeHB-10, ZeHB-11, ZeHB-12) in vascular differentiation.
- To analyze the in vitro transcriptional activity and in vivo function of these genes.
Main Methods:
- Analysis of transgenic Arabidopsis plants expressing mutated Zinnia HD-Zip III genes (mtZeHB-10, mtZeHB-12).
- Genechip array analysis to identify genes regulated by mtZeHB-12 overexpression.
- In situ expression analysis of target genes.
Main Results:
- Overexpression of mtZeHB-10 and mtZeHB-12 led to increased production of tracheary elements and xylem precursor cells, respectively.
- mtZeHB-12 overexpression induced brassinosteroid signaling and vascular-specific transcription factors.
- mtZeHB-12 induced genes for lignin monomer synthesis in xylem parenchyma cells but not TE-specific genes.
Conclusions:
- ZeHB-12 plays a role in xylem parenchyma cell differentiation.
- ZeHB-12 is not directly involved in tracheary element differentiation.
- HD-Zip III proteins have distinct roles in vascular tissue development.
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