Identification of putative target genes of bZIP19, a transcription factor essential for Arabidopsis adaptation to Zn deficiency in roots

Shoko Inaba, Rie Kurata, Mami Kobayashi, Yoko Yamagishi, Izumi Mori, Yoshiyuki Ogata, Yoichiro Fukao

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Zinc (Zn) depletion adversely affects plant growth. To avoid lethal depletion of cellular Zn, plants have evolved mechanisms to adjust the expression of genes associated with Zn homeostasis, the details of which are poorly understood. In the present study, we isolated an Arabidopsis thaliana T-DNA insertion mutant that exhibited hypersensitivity to Zn depletion. By monitoring root development under Zn-deficient conditions, we isolated a single mutant lacking the basic-region leucine-zipper transcription factor gene bZIP19. To identify proteins whose expression is affected by bZIP19, an iTRAQ-based quantitative proteomics analysis was performed using microsomal proteins from wild-type and the bzip19 mutant A. thaliana roots grown on Basal and Zn-deficient media. Of the 797 proteins identified, expression of two members of the Zrt- and Irt-related protein family, ZIP3 and ZIP9, and three defensin-like family proteins was markedly induced in wild-type but not in the bzip19 mutant under Zn-deficient conditions. Furthermore, selected reaction monitoring and quantitative real-time PCR revealed that ZIP9 expression is mediated by bZIP19 and may be partly supported by bZIP23, a homolog of bZIP19. Mutant analysis revealed that ZIP9 is involved in uptake of Zn by the roots, and the mutant lacking ZIP9 was significantly more sensitive to Zn depletion than the wild-type. These results demonstrate that bZIP19 mainly contributes to expression of genes, such as ZIP9, under Zn-deficient conditions. Significance Statement Zinc homeostasis is important for plant growth, but how plants cope with zinc deficiencies is poorly understood. We show that the Arabidopsis transcription factor bZIP19 predominantly contributes zinc deficiency adaptation, in part by affecting expression of the Zrt- and Irt-related protein 9 (ZIP9) Zn transporters.

Original languageEnglish
Pages (from-to)323-334
Number of pages12
JournalPlant Journal
Volume84
Issue number2
DOIs
Publication statusPublished - Oct 1 2015

Fingerprint

Arabidopsis
Zinc
Transcription Factors
transcription factors
zinc
Genes
genes
Proteins
mutants
proteins
Homeostasis
homeostasis
Basic-Leucine Zipper Transcription Factors
Arabidopsis thaliana
protein synthesis
plant growth
Defensins
Gene Expression
leucine zipper
gene expression

Keywords

  • Arabidopsis thaliana
  • bZIP transcription factor
  • quantitative proteomics
  • quantitative real-time PCR
  • zinc deficiency
  • ZIP family transporter

ASJC Scopus subject areas

  • Plant Science
  • Cell Biology
  • Genetics

Cite this

Identification of putative target genes of bZIP19, a transcription factor essential for Arabidopsis adaptation to Zn deficiency in roots. / Inaba, Shoko; Kurata, Rie; Kobayashi, Mami; Yamagishi, Yoko; Mori, Izumi; Ogata, Yoshiyuki; Fukao, Yoichiro.

In: Plant Journal, Vol. 84, No. 2, 01.10.2015, p. 323-334.

Research output: Contribution to journalArticle

Inaba, Shoko ; Kurata, Rie ; Kobayashi, Mami ; Yamagishi, Yoko ; Mori, Izumi ; Ogata, Yoshiyuki ; Fukao, Yoichiro. / Identification of putative target genes of bZIP19, a transcription factor essential for Arabidopsis adaptation to Zn deficiency in roots. In: Plant Journal. 2015 ; Vol. 84, No. 2. pp. 323-334.
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