Universität zu Köln

Chen, Yan, Bonkowski, Michael, Shen, Yi, Griffiths, Bryan S., Jiang, Yuji, Wang, Xiaoyue and Sun, Bo (2020). Root ethylene mediates rhizosphere microbial community reconstruction when chemically detecting cyanide produced by neighbouring plants. Microbiome, 8 (1). LONDON: BMC. ISSN 2049-2618

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Abstract

Background Stress-induced hormones are essential for plants to modulate their microbiota and dynamically adjust to the environment. Despite the emphasis of the role of the phytohormone ethylene in the plant physiological response to heterospecific neighbour detection, less is known about how this activated signal mediates focal plant rhizosphere microbiota to enhance plant fitness. Here, using 3 years of peanut (Arachis hypogaea L.), a legume, and cyanide-containing cassava (Manihot esculenta Crantz) intercropping and peanut monocropping field, pot and hydroponic experiments in addition to exogenous ethylene application and soil incubation experiments, we found that ethylene, a cyanide-derived signal, is associated with the chemical identification of neighbouring cassava and the microbial re-assemblage in the peanut rhizosphere. Results Ethylene production in peanut roots can be triggered by cyanide production of neighbouring cassava plants. This gaseous signal alters the microbial composition and re-assembles the microbial co-occurrence network of peanut by shifting the abundance of an actinobacterial species, Catenulispora sp., which becomes a keystone in the intercropped peanut rhizosphere. The re-assembled rhizosphere microbiota provide more available nutrients to peanut roots and support seed production. Conclusions Our findings suggest that root ethylene acts as a signal with a dual role. It plays a role in perceiving biochemical cues from interspecific neighbours, and also has a regulatory function in mediating the rhizosphere microbial assembly, thereby enhancing focal plant fitness by improving seed production. This discovery provides a promising direction to develop novel intercropping strategies for targeted manipulations of the rhizosphere microbiome through phytohormone signals.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Chen, Yan UNSPECIFIED UNSPECIFIED UNSPECIFIED Bonkowski, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED Shen, Yi UNSPECIFIED UNSPECIFIED UNSPECIFIED Griffiths, Bryan S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jiang, Yuji UNSPECIFIED UNSPECIFIED UNSPECIFIED Wang, Xiaoyue UNSPECIFIED UNSPECIFIED UNSPECIFIED Sun, Bo UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-348596
DOI:	10.1186/s40168-019-0775-6
Journal or Publication Title:	Microbiome
Volume:	8
Number:	1
Date:	2020
Publisher:	BMC
Place of Publication:	LONDON
ISSN:	2049-2618
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SOIL; DIVERSITY; TRAITS; GROWTH; BIOSYNTHESIS; FACILITATION; ACQUISITION; MODULARITY; ASSEMBLAGE; SYMBIOSIS Multiple languages Microbiology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/34859