Rhizobacterial volatiles and photosynthesis‐related signals coordinate MYB72 expression in Arabidopsis roots during onset of induced systemic resistance and iron‐deficiency responses

Christos Zamioudis; Jolanda Korteland; Johan A. Van Pelt; Muriël van Hamersveld; Nina Dombrowski; Yang Bai; Johannes Hanson; Marcel C. Van Verk; Hong‐Qing Ling; Paul Schulze‐Lefert; Corné M.J. Pieterse

doi:10.1111/tpj.12995

journal article Open Access Oct 01, 2015

Rhizobacterial volatiles and photosynthesis‐related signals coordinate MYB72 expression in Arabidopsis roots during onset of induced systemic resistance and iron‐deficiency responses

Christos Zamioudis Jolanda Korteland Johan A. Van Pelt Muriël van Hamersveld Nina Dombrowski

Yang Bai

Johannes Hanson

Marcel C. Van Verk Hong‐Qing Ling Paul Schulze‐Lefert Corné M.J. Pieterse

The Plant Journal Vol. 84 No. 2 pp. 309-322 · Wiley

View at Publisher Save 10.1111/tpj.12995

Abstract

SummaryIn Arabidopsis roots, the transcription factor MYB72 plays a dual role in the onset of rhizobacteria‐induced systemic resistance (ISR) and plant survival under conditions of limited iron availability. Previously, it was shown that MYB72 coordinates the expression of a gene module that promotes synthesis and excretion of iron‐mobilizing phenolic compounds in the rhizosphere, a process that is involved in both iron acquisition and ISR signaling. Here, we show that volatile organic compounds (VOCs) from ISR‐inducing Pseudomonas bacteria are important elicitors of MYB72. In response to VOC treatment, MYB72 is co‐expressed with the iron uptake‐related genes FERRIC REDUCTION OXIDASE 2 (FRO2) and IRON‐REGULATED TRANSPORTER 1 (IRT1) in a manner that is dependent on FER‐LIKE IRON DEFICIENCY TRANSCRIPTION FACTOR (FIT), indicating that MYB72 is an intrinsic part of the plant's iron‐acquisition response that is typically activated upon iron starvation. However, VOC‐induced MYB72 expression is activated independently of iron availability in the root vicinity. Moreover, rhizobacterial VOC‐mediated induction of MYB72 requires photosynthesis‐related signals, while iron deficiency in the rhizosphere activates MYB72 in the absence of shoot‐derived signals. Together, these results show that the ISR‐ and iron acquisition‐related transcription factor MYB72 in Arabidopsis roots is activated by rhizobacterial volatiles and photosynthesis‐related signals, and enhances the iron‐acquisition capacity of roots independently of the iron availability in the rhizosphere. This work highlights the role of MYB72 in plant processes by which root microbiota simultaneously stimulate systemic immunity and activate the iron‐uptake machinery in their host plants.

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References

Details

Published: Oct 01, 2015
Vol/Issue: 84(2)
Pages: 309-322
License: View

Authors

C

Christos Zamioudis

Plant–Microbe Interactions Department of Biology Faculty of Science Utrecht University PO Box 800.56 3508 TB Utrecht The Netherlands

J

Jolanda Korteland

Plant–Microbe Interactions Department of Biology Faculty of Science Utrecht University PO Box 800.56 3508 TB Utrecht The Netherlands

J

Johan A. Van Pelt

Plant–Microbe Interactions Department of Biology Faculty of Science Utrecht University PO Box 800.56 3508 TB Utrecht The Netherlands

M

Muriël van Hamersveld

Plant–Microbe Interactions Department of Biology Faculty of Science Utrecht University PO Box 800.56 3508 TB Utrecht The Netherlands

N

Nina Dombrowski

Department of Plant–Microbe Interactions Max Planck Institute for Plant Breeding Research 50829 Cologne Germany

Y

Yang Bai

Department of Plant–Microbe Interactions Max Planck Institute for Plant Breeding Research 50829 Cologne Germany

J

Johannes Hanson

Molecular Plant Physiology Department of Biology Faculty of Science Utrecht University PO Box 800.56 3508 TB Utrecht The Netherlands; Umeå Plant Science Centre Department of Plant Physiology Umeå University SE‐90187 Umeå Sweden

M

Marcel C. Van Verk

Plant–Microbe Interactions Department of Biology Faculty of Science Utrecht University PO Box 800.56 3508 TB Utrecht The Netherlands; Bioinformatics, Department of Biology Faculty of Science Utrecht University PO Box 800.56 3508 TB Utrecht The Netherlands

H

Hong‐Qing Ling

The State Key Laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental Biology Chinese Academy of Sciences No. 1 West Beichen Road Chaoyang District Beijing 100101 China

P

Paul Schulze‐Lefert

Department of Plant–Microbe Interactions Max Planck Institute for Plant Breeding Research 50829 Cologne Germany

C

Corné M.J. Pieterse

Plant–Microbe Interactions Department of Biology Faculty of Science Utrecht University PO Box 800.56 3508 TB Utrecht The Netherlands

Funding

European Research Council Award: 269072

Cite This Article

Christos Zamioudis, Jolanda Korteland, Johan A. Van Pelt, et al. (2015). Rhizobacterial volatiles and photosynthesis‐related signals coordinate MYB72 expression in Arabidopsis roots during onset of induced systemic resistance and iron‐deficiency responses. The Plant Journal, 84(2), 309-322. https://doi.org/10.1111/tpj.12995

Rhizobacterial volatiles and photosynthesis‐related signals coordinate MYB72 expression in Arabidopsis roots during onset of induced systemic resistance and iron‐deficiency responses

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