Change search
ReferencesLink to record
Permanent link

Direct link
Rhizobacterial volatiles and photosynthesis-related signals coordinate MYB72 expression in Arabidopsis roots during onset of induced systemic resistance and iron-deficiency responses
Show others and affiliations
2015 (English)In: The Plant Journal, ISSN 0960-7412, E-ISSN 1365-313X, Vol. 84, no 2, 309-322 p.Article in journal (Refereed) Published
Abstract [en]

In 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 OXIDASE2 (FRO2) and IRON-REGULATED TRANSPORTER1 (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. Significance Statement Plant roots intimately interact with plant growth-promoting rhizobacteria that prime the plant immune system and aid in iron uptake two functions facilitated by the root-specific transcription factor MYB72. Here we show how MYB72 and iron uptake responses are systemically activated by photosynthesis-related signals and volatiles produced by plant growth-promoting rhizobacteria, highlighting the important role of beneficial root microbiota in supporting plant growth and health.

Place, publisher, year, edition, pages
2015. Vol. 84, no 2, 309-322 p.
Keyword [en]
induced resistance, iron homeostasis, MYB transcription factor, volatile organic compounds, abidopsis thaliana, plant growth-promoting rhizobacteria
National Category
URN: urn:nbn:se:umu:diva-111009DOI: 10.1111/tpj.12995ISI: 000362692000005PubMedID: 26307542OAI: diva2:867098
Available from: 2015-11-04 Created: 2015-11-02 Last updated: 2015-11-16Bibliographically approved

Open Access in DiVA

fulltext(1838 kB)31 downloads
File information
File name FULLTEXT01.pdfFile size 1838 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full textPubMed

Search in DiVA

By author/editor
Hanson, Johannes
By organisation
Department of Plant PhysiologyUmeå Plant Science Centre (UPSC)
In the same journal
The Plant Journal

Search outside of DiVA

GoogleGoogle Scholar
Total: 31 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 195 hits
ReferencesLink to record
Permanent link

Direct link