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Arabidopsis AZI1 family proteins mediate signal mobilization for systemic defence priming

Author

Listed:
  • Nicolás M. Cecchini

    (The University of Chicago)

  • Kevin Steffes

    (The University of Chicago)

  • Michael R. Schläppi

    (Marquette University)

  • Andrew N. Gifford

    (Brookhaven National Laboratory
    Present address: METIS Laboratories, 20W. Lincoln Avenue, Valley Stream, New York 11580, USA.)

  • Jean T. Greenberg

    (The University of Chicago)

Abstract

Priming is a major mechanism behind the immunological ‘memory’ observed during two key plant systemic defences: systemic acquired resistance (SAR) and induced systemic resistance (ISR). Lipid-derived azelaic acid (AZA) is a mobile priming signal. Here, we show that the lipid transfer protein (LTP)-like AZI1 and its closest paralog EARLI1 are necessary for SAR, ISR and the systemic movement and uptake of AZA in Arabidopsis. Imaging and fractionation studies indicate that AZI1 and EARLI1 localize to expected places for lipid exchange/movement to occur. These are the ER/plasmodesmata, chloroplast outer envelopes and membrane contact sites between them. Furthermore, these LTP-like proteins form complexes and act at the site of SAR establishment. The plastid targeting of AZI1 and AZI1 paralogs occurs through a mechanism that may enable/facilitate their roles in signal mobilization.

Suggested Citation

  • Nicolás M. Cecchini & Kevin Steffes & Michael R. Schläppi & Andrew N. Gifford & Jean T. Greenberg, 2015. "Arabidopsis AZI1 family proteins mediate signal mobilization for systemic defence priming," Nature Communications, Nature, vol. 6(1), pages 1-12, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8658
    DOI: 10.1038/ncomms8658
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    Cited by:

    1. Zi-Wei Yan & Fang-Yan Chen & Xian Zhang & Wen-Juan Cai & Chun-Yu Chen & Jie Liu & Man-Ni Wu & Ning-Jing Liu & Bin Ma & Mu-Yang Wang & Dai-Yin Chao & Cai-Ji Gao & Ying-Bo Mao, 2023. "Endocytosis-mediated entry of a caterpillar effector into plants is countered by Jasmonate," Nature Communications, Nature, vol. 14(1), pages 1-14, December.

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