Abstract
Auxin is essential for the formation of the vascular system. We previously reported that a polar auxin transport inhibitor, 1-N-naphthylphthalamic acid (NPA) decreased intracellular auxin levels and prevented tracheary element (TE) differentiation from isolated Zinnia mesophyll cells, but that additional auxin, 1-naphthaleneacetic acid (NAA) overcame this inhibition. To understand the role of auxin in gene regulation during TE differentiation, we performed microarray analysis of genes expressed in NPA-treated cells and NPA–NAA-treated cells. The systematic gene expression analysis revealed that NAA promoted the expression of genes related to auxin signaling and transcription factors that are known to be key regulators of differentiation of procambial and xylem precursor cells. NAA also promoted the expression of genes related to biosynthesis and metabolism of other plant hormones, such as cytokinin, gibberellin and brassinosteroid. Interestingly, detailed analysis showed that NAA rapidly induces the expression of auxin carrier gene homologues. It suggested a positive feedback loop for auxin-regulating vascular differentiation. Based on these results, we discuss the auxin function in early processes of transdifferentiation into TEs.
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Abbreviations
- ABA:
-
Abscisic acid
- BL:
-
Brassinolide
- BR:
-
Brassinosteroid
- CT:
-
Cathasterone
- CS:
-
Castasterone
- 6-DeoxoCT:
-
6-Deoxocathasterone
- DMSO:
-
Dimethyl sulfoxide
- DR5:
-
Synthetic auxin-inducible promoter
- IAA:
-
Indole-3-acetic acid
- JA:
-
Jasmonic acid
- NAA:
-
1-Naphthaleneacetic acid
- NPA:
-
1-N-Naphthylphthalamic acid
- TE:
-
Tracheary element
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Acknowledgments
We thank Prof. Ken Matsuoka, Tomoko Narisawa, Mami Sasaki (RIKEN Plant Science Center) for technical advice of cDNA microarray; Prof. Thomas Schmülling (Free University of Berlin) for providing us pAtCKX::GUS transgenic line; Dr. Klahre Ulrich (University of Bern) for helpful comments on the manuscript; Yoichi Yokogawa for useful advice of microarray analysis. This work was supported in part by Grants-in-Aid from MEXT, Japan (19060009 to HF), and the Japan Society for the Promotion of Science (20247003 to HF).
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The nucleotide sequence reported in this paper has been submitted to DDBJ/EMBL/GenBank Nucleotide Sequence Databases (http://www.ddbj.nig.ac.jp/) under the following accession numbers: AB439582 (ZeCKX), AB477370Â (ZePINa), AB477371 (ZePINb), AB477372 (ZePINc), AB477373 (ZePINd), AB477374 (ZePINe), AB477375 (ZeLAX1), AB477376 (ZeLAX2).
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Yoshida, S., Iwamoto, K., Demura, T. et al. Comprehensive analysis of the regulatory roles of auxin in early transdifferentiation into xylem cells. Plant Mol Biol 70, 457–469 (2009). https://doi.org/10.1007/s11103-009-9485-y
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DOI: https://doi.org/10.1007/s11103-009-9485-y