Damage-Associated Molecular Pattern-Triggered Immunity in Plants

Hou, Sen; Liu, Zunyong; Shen, Hexi; Wu, Daoji

doi:10.3389/fpls.2019.00646

Cited by 217 publications

(146 citation statements)

References 176 publications

(220 reference statements)

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“…As a result, beta 1,4 endo xylanases may play a role in shaping the degree of plasticity in the barrier between the root and surrounding rhizosphere environments, in turn influencing the release of cell wall or apoplast derived metabolites into the rhizosphere environment 38 . Alternatively, altered xylanase activity could lead to shifts in carbohydrate profiles within the cell wall, leading to heightened plant immune responses 39,40 ; the catabolic byproducts of microbially-produced xylanase used in pathogen invasion are in part responsible for triggering innate immune responses in plants, and various components of the plant immune signalling network have been shown to influence microbiome structure 6,7 .…”

Section: Discussionmentioning

confidence: 99%

Genome wide association study reveals plant loci controlling heritability of the rhizosphere microbiome

Deng

Caddell

Yang

et al. 2020

Preprint

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45Host genetics has recently been shown to be a driver of plant microbiome composition. However, 46 identifying the underlying genetic loci controlling microbial selection remains challenging. 47 Genome wide association studies (GWAS) represent a potentially powerful, unbiased method to 48 identify microbes sensitive to host genotype, and to connect them with the genetic loci that 49 influence their colonization. Here, we conducted a population-level microbiome analysis of the 50 rhizospheres of 200 sorghum genotypes. Using 16S rRNA amplicon sequencing, we identify 51 rhizosphere-associated bacteria exhibiting heritable associations with plant genotype, and identify 52 significant overlap between these lineages and heritable taxa recently identified in maize. 53Furthermore, we demonstrate that GWAS can identify host loci that correlate with the abundance 54 of specific subsets of the rhizosphere microbiome. Finally, we demonstrate that these results can 55 be used to predict rhizosphere microbiome structure for an independent panel of sorghum 56 genotypes based solely on knowledge of host genotypic information. 57 58 sorghum 60 61Recent work has shown that root-associated microbial communities are in part shaped by host 63 genetics 1-4 . A study comparing the root microbiomes of a broad range of cereal crops has 64 demonstrated a strong correlation between host genetic differences and microbiome composition 4 , 65 suggesting that a subset of the plant microbiome may be influenced by host genotype across a 66 range of plant hosts. In maize, these genotype-sensitive, or "heritable", microbes are 67 phylogenetically clustered within specific taxonomic groups 5 ; however, it is unclear whether the 68 increased genotype sensitivity in these lineages is unique to the maize microbiome or is common 69 to other plant hosts as well. 71Despite consistent evidence of the interaction between host genetics and plant microbiome 72 composition, identifying specific genetic elements driving host-genotype dependent microbiome 73 acquisition and assembly in plants remains a challenge. Recent efforts guided by a priori 74 hypotheses of gene involvement have begun to dissect the impact of individual genes on 75 microbiome composition 6,7 . However, these studies are limited to a small fraction of plant genes 76 predicted to function in microbiome-related processes. Additionally, many plant traits expected to 77 impact microbiome composition and activity, such as root exudation 8 and root system architecture 9 , 78 are inherently complex and potentially governed by a very large number of genes. For these 79 reasons, there is a need for alternative, large-scale and unbiased methods for identifying the genes 80 that regulate host-mediated selection of the microbiome. 82Genome-wide association studies (GWAS) represent a powerful approach to map loci that are 83 associated with complex traits in a genetically diverse population. Though pioneered for use in 84 human genetics, to date the majority of GWAS have been conducted in pla...

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Section: Discussionmentioning

confidence: 99%

Genome wide association study reveals plant loci controlling heritability of the rhizosphere microbiome

Deng

Caddell

Yang

et al. 2020

Preprint

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“…These signals, called DAMPs, mainly include cell wall or extracellular protein fragments, peptides, nucleotides, amino acids, and are detected by plasma membrane-localized receptors of surrounding cells to regulate immune responses against the invading organisms and stimulate damage repair. The role of oligosaccharides as DAMPs in plant defense reactions against pathogens and physical agents have been well covered by several recent reviews [66,67]. Molecule fragments released from cell walls trigger genetic alterations and induce biological activity of plants.…”

Section: Natural Compounds Against Plant Diseasesmentioning

confidence: 99%

“…Molecule fragments released from cell walls trigger genetic alterations and induce biological activity of plants. Different types of genetic transcription within cutin cells lead to cutin morphological modulation such as higher accumulation of cutin monomer [68], deposition of cell wall polysaccharides [66], callose accumulation, papillae formation, lignification and suberin synthesis, as well as accumulation of structural proteins [67]. Under the influence of elicitors, structural changes occur in association with stiffening of this structure, which limits and blocks pathogen development (Figure 1).…”

Section: Natural Compounds Against Plant Diseasesmentioning

confidence: 99%

Natural Compounds as Elicitors of Plant Resistance Against Diseases and New Biocontrol Strategies

Jamiołkowska

2020

Agronomy

118

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The goal of sustainable and organic agriculture is to optimize the health and productivity of interdependent communities of soil life, plants, animals, and people. Organic plant production uses natural products and natural self-regulation processes occurring in the ecosystem. The availability of innovative applications and molecular techniques opens up new possibilities in the approach to plant protection for sustainable and organic agriculture. New strategies not only directly protect plants against pathogens but can also induce enhanced immunity that permanently protects against pathogenic strains. This review focuses on the bioactive properties of selected natural compounds (of plant and animal origin), their action on pathogens, and their roles in the mechanism of inducing plant resistance. The author presents selected activities of organic bioactive compounds, such as allicin, naringin, terpenes, laminarin, carrageenans, chitin and chitosan, and outlines the possibilities for their application in protecting crop plants against diseases. In addition, this mini review describes the mechanism of action of the above compounds as elicitors of defense reactions in the plant and the possibility of their utilization in the production of biological preparations as elements of a new plant protection strategy.

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“…via their innate immunity. Recognition of pathogen elicitors by the plant immune system is mediated through extracellular and intracellular receptor proteins that recognize pathogen-associated molecular patterns (PAMPs), secreted pathogen effectors or plant degradation products [damage-associated molecular patterns (DAMPs)] produced by the activity of hydrolytic enzymes secreted by invading pathogens [2][3][4]. Upon recognition of invading pathogens, plants initiate production of antimicrobial molecules, accumulation of pathogenesis-related (PR) proteins, stomata closure, modification of the cell wall and production of reactive oxygen species (ROS) [5].…”

Section: Introductionmentioning

confidence: 99%

The immunity of Meiwa kumquat against Xanthomonas citri is associated with a known susceptibility gene induced by a transcription activator-like effector

Teper

et al. 2020

PLoS Pathog

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Citrus canker caused by Xanthomonas citri subsp. citri (Xcc) is one of the most devastating diseases in citrus. Meiwa kumquat (Fortunella crassifolia) has shown a durable resistance against Xcc. Here, we aimed to characterize the mechanisms responsible for such a durable resistance by characterizing the transcriptional and physiological responses of Meiwa kumquat to Xcc. Inoculation of Meiwa kumquat with Xcc promoted immune responses such as upregulation of PR genes, accumulation of salicylic acid, hypersensitive response (HR)-like cell death and early leaf abscission. Hypertrophy and hyperplasia symptoms, which are known to be caused by Xcc-induction of the canker susceptibility gene LOB1 through the transcription activator-like effector (TALE) PthA4, always appear prior to the development of cell death. Mutation of pthA4 in Xcc abolished the induction of LOB1, canker symptoms, cell death, and leaf abscission and reduced the expression of PR genes in inoculated kumquat leaves without reducing Xcc titers in planta. Transcriptome analysis demonstrated that PthA4 promotes plant biotic and abiotic stress responses and the biosynthesis of abscisic acid. Transcriptional induction of LOB1 homologs in Meiwa kumquat by Xcc pthA4 mutant strains carrying a repertoire of designer TALEs promoted the elicitation of HR-like phenotype and leaf abscission, suggesting that kumquat response to Xcc is associated with upregulation of LOB1. Our study suggests a novel mechanism of plant resistance to Xanthomonas via elicitation of immune responses by upregulation of a host susceptibility gene.

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Damage-Associated Molecular Pattern-Triggered Immunity in Plants

Cited by 217 publications

References 176 publications

Genome wide association study reveals plant loci controlling heritability of the rhizosphere microbiome

Genome wide association study reveals plant loci controlling heritability of the rhizosphere microbiome

Natural Compounds as Elicitors of Plant Resistance Against Diseases and New Biocontrol Strategies

The immunity of Meiwa kumquat against Xanthomonas citri is associated with a known susceptibility gene induced by a transcription activator-like effector

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