Rhizobacterium-derived diacetyl modulates plant immunity in a phosphate-dependent manner.
EMBO J
; 39(2): e102602, 2020 01 15.
Article
em En
| MEDLINE
| ID: mdl-31802519
ABSTRACT
Plants establish mutualistic associations with beneficial microbes while deploying the immune system to defend against pathogenic ones. Little is known about the interplay between mutualism and immunity and the mediator molecules enabling such crosstalk. Here, we show that plants respond differentially to a volatile bacterial compound through integral modulation of the immune system and the phosphate-starvation response (PSR) system, resulting in either mutualism or immunity. We found that exposure of Arabidopsis thaliana to a known plant growth-promoting rhizobacterium can unexpectedly have either beneficial or deleterious effects to plants. The beneficial-to-deleterious transition is dependent on availability of phosphate to the plants and is mediated by diacetyl, a bacterial volatile compound. Under phosphate-sufficient conditions, diacetyl partially suppresses plant production of reactive oxygen species (ROS) and enhances symbiont colonization without compromising disease resistance. Under phosphate-deficient conditions, diacetyl enhances phytohormone-mediated immunity and consequently causes plant hyper-sensitivity to phosphate deficiency. Therefore, diacetyl affects the type of relation between plant hosts and certain rhizobacteria in a way that depends on the plant's phosphate-starvation response system and phytohormone-mediated immunity.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Fosfatos
/
Doenças das Plantas
/
Arabidopsis
/
Raízes de Plantas
/
Diacetil
/
Imunidade Vegetal
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article