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Root ethylene mediates rhizosphere microbial community reconstruction when chemically detecting cyanide produced by neighbouring plants

文献类型： 外文期刊

作者： Chen, Yan 1 ; Bonkowski, Michael 2 ; Shen, Yi 4 ; Griffiths, Bryan S. 5 ; Jiang, Yuji 1 ; Wang, Xiaoyue 1 ; Sun, Bo 1 ;

作者机构： 1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, 71 East Beijing Rd, Nanjing 210008, Peoples R China

2.Univ Cologne, Inst Zool, Terr Ecol, Zulpicher Str 47b, D-50674 Cologne, Germany

3.Univ Cologne, Cluster Excellence Plant Sci CEPLAS, Cologne, Germany

4.Jiangsu Acad Agr Sci, Inst Ind Crops, 50 Zhonglin St, Nanjing 210014, Peoples R China

5.SRUC, Crop & Soil Syst Res Grp, West Mains Rd, Edinburgh EH9 3JG, Midlothian, Scotland

关键词： Ethylene signal; Neighbour detection; Chemical cue; Interspecific interaction; Cyanide; Rhizosphere microbial assemblage; Plant fitness

期刊名称：MICROBIOME （ 影响因子：14.65； 五年影响因子：15.677 ）

ISSN： 2049-2618

年卷期： 2020 年 8 卷 1 期

页码：

收录情况： SCI

摘要： 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.

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