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Research ArticleLARGE-SCALE BIOLOGY ARTICLE
Open Access

Convergent Loss of an EDS1/PAD4 Signaling Pathway in Several Plant Lineages Reveals Coevolved Components of Plant Immunity and Drought Response

Erin L. Baggs, J. Grey Monroe, Anil S. Thanki, Ruby O’Grady, Christian Schudoma, Wilfried Haerty, Ksenia V. Krasileva
Erin L. Baggs
aEarlham Institute, Norwich Research Park, Norwich NR4 7UZ, United Kingdom
bUniversity of California Berkeley, Berkeley, California 94720
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  • ORCID record for Erin L. Baggs
J. Grey Monroe
cUniversity of California Davis, Davis, California 95616
dMax Planck Institute for Developmental Biology, 72076 Tübingen, Germany
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Anil S. Thanki
aEarlham Institute, Norwich Research Park, Norwich NR4 7UZ, United Kingdom
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  • ORCID record for Anil S. Thanki
Ruby O’Grady
eThe Sainsbury Laboratory, Norwich Research Park, Norwich NR4 7UH, United Kingdom
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Christian Schudoma
aEarlham Institute, Norwich Research Park, Norwich NR4 7UZ, United Kingdom
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Wilfried Haerty
aEarlham Institute, Norwich Research Park, Norwich NR4 7UZ, United Kingdom
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Ksenia V. Krasileva
aEarlham Institute, Norwich Research Park, Norwich NR4 7UZ, United Kingdom
bUniversity of California Berkeley, Berkeley, California 94720
eThe Sainsbury Laboratory, Norwich Research Park, Norwich NR4 7UH, United Kingdom
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  • For correspondence: kseniak@berkeley.edu

Published July 2020. DOI: https://doi.org/10.1105/tpc.19.00903

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    Figure 1.

    Phylogenetic Relationship and NLR Repertoires of the Plant Species Used in This Study.

    (A) Boxplot showing the variation in number of NB-ARC domains across Amborellales (n = 1), monocot (n = 42), and eudicot (n = 60) genomes available on Phytozome, Ensembl Plants or CoGe.

    (B) Histogram of numbers of NB-ARC domains identified in angiosperm genomes.

    (C) Species tree of monocot and eudicot genomes of interest. Number of NLRs with all 6 characteristic NLR amino-acid motifs annotated in each species are displayed in line with the species Latin name. Number of NLRs identified by PfamScan and the plant_rgenes pipeline are in parentheses. Black/red numbers on branches indicate the number of gained/lost NLRs.

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    Figure 2.

    Maximum likelihood phylogeny of NLRs in the 18 representative plant species and selected reference NLRs. The maximum likelihood tree is based on the alignment of the NB-ARC domains of the 18 representative species of A. trichopoda, Z. marina, S. polyrhiza, E. guineensis, A. comosus, P. equestris, O. thomaeum, Z. mays, O. sativa, A. thaliana, A. coerulea, N. nucifera, A. hypochondriacus, S. lycopersicum, F. excelsior, E. guttata, U. gibba, and G. aurea. Bootstraps >80 are indicated by a red dot; branch colors denote species. Clades as defined by bootstrap >80; TNLs and RNLs are within the blue and red sections, respectively. Inlayed sub-trees provide a zoom-in to the TNL, RNL, and CNL clades, where colored branches are indicative of Z. marina, S. polyrhiza, and G. aurea. Sub-tree within gray box is an example of a CNL expansion present in S. polyrhiza.

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    Figure 3.

    Presence/absence analysis of known plant immunity components. Rows denote species, which are arranged as per phylogenetic relationship, with the green and purple bars indicating monocots, or, respectively, dicots. Gene names are listed at the top. Circles in columns denote the presence or absence of known components of the NLR signaling pathway. Black filled circles represent orthologs identified by reciprocal blastp. Orthologs supported by tblastn are indicated by black circles outlined in red. Absent orthologs are displayed by white circles with a red outline, and partial orthologs are shown as gray circles with a black outline. Orthology was also manually curated using Ensembl Plant gene trees or Phytozome synteny (where available).

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    Figure 4.

    Syntenic Blocks of Genomic Loci of ASTREL Genes PAD4, ADR1, and EDS1 Between A. comosus and S. polyrhiza.

    Genes and their direction are represented as arrows along the loci. Orthologs between A. comosus and S. polyrhiza are indicated by orange lines. Gray triangles with numbers indicate groups of additional genes not displayed here. The focal gene is highlighted with a red outline. Subplots visualize the syntenies of the loci of PAD4 (A), ADR1 (B), and EDS1 (C).

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    Figure 5.

    Protein Family Analysis to Identify ASTREL Genes.

    (A) Schematic diagram of the OrthoMCL approach to cluster protein families separately among monocot and eudicot species and then filtering for protein families present in species with EDS1. Proteins are denoted by different line drawings, colored by species of origin. Phylogenetic trees represent gene trees for each protein. The diagram at the bottom provides the number of Arabidopsis proteins that are absent only in monocots, eudicots, or in all angiosperms without EDS1.

    (B) Illustration of the GeneSeqToFamily method, which uses monocot and eudicot proteomes together to establish gene trees across the angiosperms.

    (C) Diagram summarizing the results of the two methods. Genes and numbers marked in red are those subsequently referred to as ASTREL genes.

    (D) Schematic of gene clustering followed by blastp and tblastn to filter ASTREL genes for presence or absence in the A. officinalis genome.

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    Figure 6.

    Differential Gene Expression Analysis of Arabidopsis and O. sativa High Confidence ASTREL Genes Upon Biotic and Abiotic Stress.

    (A) Pearson hierarchical clustering of differential gene expression of ASTREL genes from Arabidopsis upon pathogen, ABA, and nicotinamide treatments.

    (B) Pearson hierarchical clustering of differential gene expression of ASTREL genes from O. sativa upon pathogen, drought, cold, and salt treatment.

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    Figure 7.

    Schematic Model of Hypothetical Relationships Between ASTREL Genes and Known Biotic and Abiotic Stress Pathways in Arabidopsis.

    The model is based on literature review and available gene expression of potential interactions of ASTREL genes within the known Arabidopsis biotrophic pathogen disease resistance genetic pathway.

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    Table 1. High Confidence ASTREL Orthogroups Absent in all 5 Species (S. polyrhiza, Z. marina, U. gibba, G. aurea, and A. officinalis)
    Arabidopsis Gene Names Within OrthogroupIdentification MethodPfam DomainsKnown Role in ImmunityOther Roles
    Lipase-like: EDS1.1, EDS1.2, PAD4, SAG101Galaxy group 16353Lipase_3Downstream signaling of NLRs (Lapin et al., 2019; Wagner et al., 2013; Cui et al., 2017; Zhu et al., 2011)Crosstalk in drought pathway (Chini et al., 2004)
    Dicot_5571EDS1_EP
    Monocot_8566
    RNLs: NRG1, NRG1.2, NRG1.3, ADR1, ADR1-L1, ADR1-L2, ADR1-L3, RPW8Galaxy group 4516RPW8, NB-ARC, LRRDownstream signaling of NLRs. (Bonardi et al., 2011; Castel et al., 2018; Qi et al., 2018; Lapin et al., 2019; Wu et al., 2019)Initial stomatal closure for drought tolerance (Chini et al., 2004)
    Dicot_3070
    Monocot_8024
    SDR4Dicot_3663Badh_short_C2NoN/A
    SDR5Monocot_4965
    ASPG2Dicot_8371TAXi_N​, TAXi_NCNoN/A
    Monocot_7573
    EDL3Dicot_10185F-box_likeNoRegulator of ABA signaling, osmotic stress-responsive (Koops et al., 2011).
    Monocot_9077
    • N/A, not applicable.

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    Table 2. Data Sets Used to Investigate Further Changes in Gene Expression under Drought or Pathogen Infection across the 52 (Arabidopsis) ASTREL, Monocot, and Eudicot Overlapping Genes
    PlantType of StimulusExperiment NumberReference
    ArabidopsisPathogenAT-00202(Craigon et al., 2004)
    ArabidopsisPathogenAT-00406(Craigon et al., 2004)
    RicePathogenOS-00057(Yu et al., 2011)
    RicePathogenOS-00045(Marcel et al., 2010)
    RicePathogenOS-00011(Haiyan et al., 2012)
    ArabidopsisNicotinamideAT-00398(Dalchau et al., 2010)
    ArabidopsisDroughtAT-00110(Kilian et al., 2007)
    ArabidopsisDroughtAT-00433(Pandey et al., 2010)
    ArabidopsisDroughtAT-00468(Böhmer and Schroeder, 2011)
    ArabidopsisDroughtAT-00541(Kim et al., 2011)
    RiceDroughtOS-00008(Jain et al., 2007)
    RiceDroughtOS-00041(Wang et al., 2011)
    RiceDroughtOS-00224(Krishnan et al., 2010)

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Convergent Loss of an EDS1/PAD4 Signaling Pathway in Several Plant Lineages Reveals Coevolved Components of Plant Immunity and Drought Response
Erin L. Baggs, J. Grey Monroe, Anil S. Thanki, Ruby O’Grady, Christian Schudoma, Wilfried Haerty, Ksenia V. Krasileva
The Plant Cell Jul 2020, 32 (7) 2158-2177; DOI: 10.1105/tpc.19.00903

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Convergent Loss of an EDS1/PAD4 Signaling Pathway in Several Plant Lineages Reveals Coevolved Components of Plant Immunity and Drought Response
Erin L. Baggs, J. Grey Monroe, Anil S. Thanki, Ruby O’Grady, Christian Schudoma, Wilfried Haerty, Ksenia V. Krasileva
The Plant Cell Jul 2020, 32 (7) 2158-2177; DOI: 10.1105/tpc.19.00903
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The Plant Cell: 32 (7)
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