Root exudate metabolites drive plant-soil feedbacks on growth and defense by shaping the rhizosphere microbiota

Nature Communications
Lingfei HuMatthias Erb

Abstract

By changing soil properties, plants can modify their growth environment. Although the soil microbiota is known to play a key role in the resulting plant-soil feedbacks, the proximal mechanisms underlying this phenomenon remain unknown. We found that benzoxazinoids, a class of defensive secondary metabolites that are released by roots of cereals such as wheat and maize, alter root-associated fungal and bacterial communities, decrease plant growth, increase jasmonate signaling and plant defenses, and suppress herbivore performance in the next plant generation. Complementation experiments demonstrate that the benzoxazinoid breakdown product 6-methoxy-benzoxazolin-2-one (MBOA), which accumulates in the soil during the conditioning phase, is both sufficient and necessary to trigger the observed phenotypic changes. Sterilization, fungal and bacterial profiling and complementation experiments reveal that MBOA acts indirectly by altering root-associated microbiota. Our results reveal a mechanism by which plants determine the composition of rhizosphere microbiota, plant performance and plant-herbivore interactions of the next generation.

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Citations

Oct 9, 2018·Nature Biotechnology·Min-Jung KwakJihyun F Kim
Dec 26, 2018·Molecular Ecology·Charley J HubbardCynthia Weinig
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Datasets Mentioned

BETA
PRJEB15152
SAMEA54297418
PRJEB20127

Methods Mentioned

BETA
X-ray
Assay
PCR
Fluorescence
electrophoresis
PCA

Software Mentioned

R
vegan
car
FLASH
Cutadapt
QIIME
PRINSEQ
lsmeans
Digimizer
sciplot

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