Plant Molecular Biology

, Volume 92, Issue 6, pp 717–730 | Cite as

Arabidopsis acyl-CoA-binding protein ACBP6 localizes in the phloem and affects jasmonate composition

  • Zi-Wei Ye
  • Shiu-Cheung Lung
  • Tai-Hua Hu
  • Qin-Fang Chen
  • Yung-Lee Suen
  • Mingfu Wang
  • Susanne Hoffmann-Benning
  • Edward Yeung
  • Mee-Len Chye
Article

Abstract

Arabidopsis thaliana ACYL-COA-BINDING PROTEIN6 (AtACBP6) encodes a cytosolic 10-kDa AtACBP. It confers freezing tolerance in transgenic Arabidopsis, possibly by its interaction with lipids as indicated by the binding of acyl-CoA esters and phosphatidylcholine to recombinant AtACBP6. Herein, transgenic Arabidopsis transformed with an AtACBP6 promoter-driven β-glucuronidase (GUS) construct exhibited strong GUS activity in the vascular tissues. Immunoelectron microscopy using anti-AtACBP6 antibodies showed AtACBP6 localization in the phloem especially in the companion cells and sieve elements. Also, the presence of gold grains in the plasmodesmata indicated its potential role in systemic trafficking. The AtACBP6 protein, but not its mRNA, was found in phloem exudate of wild-type Arabidopsis. Fatty acid profiling using gas chromatography-mass spectrometry revealed an increase in the jasmonic acid (JA) precursor, 12-oxo-cis,cis-10,15-phytodienoic acid (cis-OPDA), and a reduction in JA and/or its derivatives in acbp6 phloem exudates in comparison to the wild type. Quantitative real-time PCR showed down-regulation of COMATOSE (CTS) in acbp6 rosettes suggesting that AtACBP6 affects CTS function. AtACBP6 appeared to affect the content of JA and/or its derivatives in the sieve tubes, which is consistent with its role in pathogen-defense and in its wound-inducibility of AtACBP6pro::GUS. Taken together, our results suggest the involvement of AtACBP6 in JA-biosynthesis in Arabidopsis phloem tissues.

Keywords

Acyl-CoA-binding protein Arabidopsis Companion cell OPDA Phloem exudates Sieve elements 

Abbreviations

13-LOX

13-Lipoxygenase

ACBP

Acyl-CoA-binding protein

ACX

Acyl-CoA oxidase

AOC

Allene oxide cyclase

AOS

Allene oxide synthesis

BSA

Bovine serum albumin

CC

Companion cell

cis-OPDA

12-oxo-cis,cis-10,15-phytodienoic acid

CTS

COMATOSE

dn-OPDA

Dinor-oxo-phytodienoic acid

FA

Fatty acid

GC-MS

Gas chromatography-mass spectrometry

GUS

β-Glucuronidase

ITC

Isothermal titration calorimetry

JA

Jasmonic acid

OE

Overexpressor

OPC-8

12-Oxophytoenoic acid

OPCL

4-Cl-like CoA-ligase

OPR3

12-oxo-phytodienoic acid reductase3

PA

Phosphatidic acid

PC

Phosphatidylcholine

PP

Phloem parenchyma

qRT-PCR

Quantitative real-time PCR

RT-PCR

Reverse transcription-PCR

SE

Sieve element

Notes

Acknowledgments

We thank Wing-Sung Lee (Electron Microscope Unit, the University of Hong Kong) for help with EM, and Dan-Ni Nie (the University of Hong Kong) for phloem exudate collection. This work was supported by the Wilson and Amelia Wong Endowment Fund and the Research Grants Council of Hong Kong (HKU765813M). ZWY was supported by a University Postgraduate Fellowship, THH, QFC and YLS by HKU Postgraduate Studentships, and SCL by a postdoctoral fellowship. SHB was supported by NSF-IOS Grant #1144391.

Author contributions

This study was designed, directed and coordinated by MLC and EY. MLC provided the conceptual and technical guidance through the project. ZWY planned and carried out the western blot and qRT-PCR analysis, wounding experiments and immunoelectron microscopy; SCL and QFC performed the GUS-sectioning and microscopy; ZWY, THH and YLS carried out GC-MS analysis; MW and SHB contributed to the lipid analysis. The manuscript was written by ZWY and MLC and commented by all authors.

Supplementary material

11103_2016_541_MOESM1_ESM.docx (2.2 mb)
Supplementary material 1 (DOCX 2233 KB)

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • Zi-Wei Ye
    • 1
  • Shiu-Cheung Lung
    • 1
  • Tai-Hua Hu
    • 1
  • Qin-Fang Chen
    • 1
  • Yung-Lee Suen
    • 1
  • Mingfu Wang
    • 1
  • Susanne Hoffmann-Benning
    • 2
  • Edward Yeung
    • 3
  • Mee-Len Chye
    • 1
  1. 1.School of Biological SciencesThe University of Hong KongHong KongChina
  2. 2.Department of Biochemistry and Molecular BiologyMichigan State UniversityEast LansingUSA
  3. 3.Department of Biological SciencesUniversity of CalgaryCalgaryCanada

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