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题目：Emergent bacterial community properties induce enhanced drought tolerance in Arabidopsis
The overall emergence characteristics of the bacterial community induced drought resistance in Arabidopsis thaliana
Corresponding author: Søren J. Sørensen & Mette Burmølle
First Author: Yang Nan (PhD Candidate)
Units: Department of Biology, University of Copenhagen
Original link: https://www.nature.com/articles/s41522-021-00253-0
summary
Drought severely limits plant production and global warming is exacerbating drought stress on crops. Many data have revealed that certain individual strains can affect the stress resistance of plants. However, the effects of emergent properties on plant drought resistance in microbial communities have largely remained unexplored. A small microbial population of four bacteria (Oligomonas lucidum, Xanthomonas, Microbacterium oxide and Bacillus amyloidium, abbreviated as SPMX) are able to synergistically produce more biofilms (bioflims) and biomass than a single member of the population. Therefore, we inoculated the microbiome SPMX at the rhizosphere of Arabidopsis thaliana to investigate its effects on plants under drought stress and their rhizosphere microbiome. We found that SPMX significantly improved plant survival under 21-day drought stress, inducing drought resistance in plants, while individual members in SPMX did not improve plant drought resistance. This result suggests that the increased drought resistance of plants stems from the potential overall emergence characteristics of SPMX. In addition, increased drought resistance was associated with sustained chlorophyll content and endogenous abscisic acid (ABA) signaling in plants after SPMX treatment. We further found that inoculated SPMX helped stabilize the structure and diversity of plant rhizosphere microbial communities. These SPMX-induced changes help plants grow in drought while also potentially increasing the plant's drought resistance. This work may help inspire future exploration of the overall emergence characteristics of microbial communities to improve plant resistance to drought stress.
Picture of the main result
Figure 1: Effects of SPMX and community individuals on the survival rate of Arabidopsis thaliana under 21-day drought stress. Experimental design (a), colony morphology (b), overall emergence characteristics of SPMX improve drought resistance (c-f), and SPMX forms biofilms in plant roots (g).
Figure 2: Effects of SPMX on the growth phenotype of Arabidopsis plants in drought.
Figure 3: SPMX induces endogenous ABA synthetic gene expression (a-b) and corresponding external drought stress gene expression levels decrease (c-d). Schematic diagram of SPMX affecting the ABA signal path (e).
Figure 4: Comparison of the relative abundance of SPMX in the root-related microbial community (rhizosphere and rhizoplane) under normal and under drought conditions.
Figure 5: Effects of drought stress and SPMX on the composition and diversity of plant root microbial communities (rhizosphere and rhizoplane, respectively) (a-c). Random forest (d).
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