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Hudson A, Mullens A, Hind S, Jamann T, Balint-Kurti P. Natural variation in the pattern-triggered immunity response in plants: Investigations, implications and applications. MOLECULAR PLANT PATHOLOGY 2024; 25:e13445. [PMID: 38528659 DOI: 10.1111/mpp.13445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 02/26/2024] [Accepted: 03/01/2024] [Indexed: 03/27/2024]
Abstract
The pattern-triggered immunity (PTI) response is triggered at the plant cell surface by the recognition of microbe-derived molecules known as microbe- or pathogen-associated molecular patterns or molecules derived from compromised host cells called damage-associated molecular patterns. Membrane-localized receptor proteins, known as pattern recognition receptors, are responsible for this recognition. Although much of the machinery of PTI is conserved, natural variation for the PTI response exists within and across species with respect to the components responsible for pattern recognition, activation of the response, and the strength of the response induced. This review describes what is known about this variation. We discuss how variation in the PTI response can be measured and how this knowledge might be utilized in the control of plant disease and in developing plant varieties with enhanced disease resistance.
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Affiliation(s)
- Asher Hudson
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
| | - Alexander Mullens
- Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Sarah Hind
- Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Tiffany Jamann
- Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Peter Balint-Kurti
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
- Plant Science Research Unit, USDA-ARS, Raleigh, North Carolina, USA
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2
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Wang Q, Zhang Y, Cui L, Meng J, Yang S, Li X, Wan S. Different roles of Ca 2+ and chitohexose in peanut ( Arachis Hypogaea) photosynthetic responses to PAMP-immunity. PeerJ 2024; 12:e16841. [PMID: 38361767 PMCID: PMC10868521 DOI: 10.7717/peerj.16841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Accepted: 01/05/2024] [Indexed: 02/17/2024] Open
Abstract
Background During active infections, plants prevent further spread of pathogenic microorganisms by inducing the rapid programmed death of cells around the infection point. This phenomenon is called the hypersensitive response and is a common feature of plant immune responses. Plants recognize conserved structures of pathogenic microorganisms, called pathogen-associated molecular patterns (PAMPs), e.g., flagellin 22 (flg22) and chitohexose, which bind to receptors on plant cells to induce various immune-response pathways. Although abiotic stresses are known to alter photosynthesis, the different effects of flg22 and chitohexose, which are involved into PAMP-induced signaling, on photosynthesis needs further study. Methods In the present study, we assessed the role of PAMPs in peanut (Arachis hypogaea) photosynthesis, particularly, the interaction between PAMPs and Ca2+ signal transduction pathway. Results Both flg22 and chitohexose significantly promoted the expression of the pathogenesis-related genes PR-4 and PR-10, as did Ca2+. We found that Ca2+ is involved in downregulating the photosystem II (PSII) reaction center activity induced by the flg22 immune response, but the role of chitohexose is not obvious. Additionally, Ca2+ significantly reduced the non-photochemical energy dissipation in the flg22- and chitohexose-induced immune response. Conclusion These results indicated that flg22 and chitohexose can trigger peanut immune pathways through the Ca2+ signaling pathway, but they differ in their regulation of the activity of the PSII reaction center.
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Affiliation(s)
- Quan Wang
- Institute of Crop Germplasm Resources, Shandong Academy of Agricultural Sciences, Ji’nan, China
| | - Ye Zhang
- HuangShan University, College of Life and Environment Sciences, Huangshan, China
| | - Li Cui
- Institute of Crop Germplasm Resources, Shandong Academy of Agricultural Sciences, Ji’nan, China
| | - Jingjing Meng
- Institute of Crop Germplasm Resources, Shandong Academy of Agricultural Sciences, Ji’nan, China
| | - Sha Yang
- Institute of Crop Germplasm Resources, Shandong Academy of Agricultural Sciences, Ji’nan, China
| | - Xinguo Li
- Institute of Crop Germplasm Resources, Shandong Academy of Agricultural Sciences, Ji’nan, China
| | - Shubo Wan
- Shandong Academy of Agricultural Sciences, Ji’nan, China
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Wang Z, Li X, Yao X, Ma J, Lu K, An Y, Sun Z, Wang Q, Zhou M, Qin L, Zhang L, Zou S, Chen L, Song C, Dong H, Zhang M, Chen X. MYB44 regulates PTI by promoting the expression of EIN2 and MPK3/6 in Arabidopsis. PLANT COMMUNICATIONS 2023; 4:100628. [PMID: 37221824 PMCID: PMC10721452 DOI: 10.1016/j.xplc.2023.100628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 04/03/2023] [Accepted: 05/18/2023] [Indexed: 05/25/2023]
Abstract
The plant signaling pathway that regulates pathogen-associated molecular pattern (PAMP)-triggered immunity (PTI) involves mitogen-activated protein kinase (MAPK) cascades that comprise sequential activation of several protein kinases and the ensuing phosphorylation of MAPKs, which activate transcription factors (TFs) to promote downstream defense responses. To identify plant TFs that regulate MAPKs, we investigated TF-defective mutants of Arabidopsis thaliana and identified MYB44 as an essential constituent of the PTI pathway. MYB44 confers resistance against the bacterial pathogen Pseudomonas syringae by cooperating with MPK3 and MPK6. Under PAMP treatment, MYB44 binds to the promoters of MPK3 and MPK6 to activate their expression, leading to phosphorylation of MPK3 and MPK6 proteins. In turn, phosphorylated MPK3 and MPK6 phosphorylate MYB44 in a functionally redundant manner, thus enabling MYB44 to activate MPK3 and MPK6 expression and further activate downstream defense responses. Activation of defense responses has also been attributed to activation of EIN2 transcription by MYB44, which has previously been shown to affect PAMP recognition and PTI development. AtMYB44 thus functions as an integral component of the PTI pathway by connecting transcriptional and posttranscriptional regulation of the MPK3/6 cascade.
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Affiliation(s)
- Zuodong Wang
- College of Plant Protection, Shandong Agricultural University, Taian 271018, China
| | - Xiaoxu Li
- College of Plant Protection, Shandong Agricultural University, Taian 271018, China
| | - Xiaohui Yao
- College of Plant Protection, Shandong Agricultural University, Taian 271018, China; Qilu College, Shandong Agricultural University, Taian 271018, China
| | - Jinbiao Ma
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
| | - Kai Lu
- College of Plant Protection, Shandong Agricultural University, Taian 271018, China
| | - Yuyan An
- College of Life Sciences, Shaanxi Normal University, Xi'an 710119, China
| | - Zhimao Sun
- College of Life Sciences, Shaanxi Normal University, Xi'an 710119, China
| | - Qian Wang
- College of Plant Protection, Shandong Agricultural University, Taian 271018, China
| | - Miao Zhou
- College of Plant Protection, Shandong Agricultural University, Taian 271018, China
| | - Lina Qin
- College of Plant Protection, Shandong Agricultural University, Taian 271018, China
| | - Liyuan Zhang
- College of Plant Protection, Shandong Agricultural University, Taian 271018, China
| | - Shenshen Zou
- College of Plant Protection, Shandong Agricultural University, Taian 271018, China
| | - Lei Chen
- College of Plant Protection, Shandong Agricultural University, Taian 271018, China
| | - Congfeng Song
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
| | - Hansong Dong
- College of Plant Protection, Shandong Agricultural University, Taian 271018, China; Qilu College, Shandong Agricultural University, Taian 271018, China.
| | - Meixiang Zhang
- College of Life Sciences, Shaanxi Normal University, Xi'an 710119, China.
| | - Xiaochen Chen
- College of Plant Protection, Shandong Agricultural University, Taian 271018, China.
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Liu J, Wang L, Jiang S, Wang Z, Li H, Wang H. Mining of Minor Disease Resistance Genes in V. vinifera Grapes Based on Transcriptome. Int J Mol Sci 2023; 24:15311. [PMID: 37894991 PMCID: PMC10607095 DOI: 10.3390/ijms242015311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 10/09/2023] [Accepted: 10/10/2023] [Indexed: 10/29/2023] Open
Abstract
Intraspecific recurrent selection in V. vinifera is an effective method for grape breeding with high quality and disease resistance. The core theory of this method is the substitution accumulation of multi-genes with low disease resistance. The discovery of multi-genes for disease resistance in V. vinifera may provide a molecular basis for breeding for disease resistance in V. vinifera. In this study, resistance to downy mildew was identified, and genetic analysis was carried out in the intraspecific crossing population of V. vinifera (Ecolly × Dunkelfelder) to screen immune, highly resistant and disease-resistant plant samples; transcriptome sequencing and differential expression analysis were performed using high-throughput sequencing. The results showed that there were 546 differential genes (194 up-regulated and 352 down-regulated) in the immune group compared to the highly resistant group, and 199 differential genes (50 up-regulated and 149 down-regulated) in the highly resistant group compared to the resistant group, there were 103 differential genes (54 up-regulated and 49 down-regulated) in the immune group compared to the resistant group. KEGG analysis of differentially expressed genes in the immune versus high-resistance group. The pathway is mainly concentrated in phenylpropanoid biosynthesis, starch and sucrose metabolism, MAPK signaling pathway-plant, carotenoid biosyn-thesis and isoquinoline alkaloid biosynthesis. The differential gene functions of immune and resistant, high-resistant and resistant combinations were mainly enriched in plant-pathogen interaction pathway. Through the analysis of disease resistance-related genes in each pathway, the potential minor resistance genes in V. vinifera were mined, and the accumulation of minor resistance genes was analyzed from the molecular level.
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Affiliation(s)
- Junli Liu
- College of Enology, Northwest A&F University, Xianyang 712100, China; (J.L.); (L.W.); (S.J.); (Z.W.)
| | - Liang Wang
- College of Enology, Northwest A&F University, Xianyang 712100, China; (J.L.); (L.W.); (S.J.); (Z.W.)
| | - Shan Jiang
- College of Enology, Northwest A&F University, Xianyang 712100, China; (J.L.); (L.W.); (S.J.); (Z.W.)
| | - Zhilei Wang
- College of Enology, Northwest A&F University, Xianyang 712100, China; (J.L.); (L.W.); (S.J.); (Z.W.)
| | - Hua Li
- College of Enology, Northwest A&F University, Xianyang 712100, China; (J.L.); (L.W.); (S.J.); (Z.W.)
- China Wine Industry Technology Institute, Yinchuan 750021, China
- Shaanxi Engineering Research Center for Viti-Viniculture, Xianyang 712100, China
- Engineering Research Center for Viti-Viniculture, National Forestry and Grassland Administration, Xianyang 712100, China
| | - Hua Wang
- College of Enology, Northwest A&F University, Xianyang 712100, China; (J.L.); (L.W.); (S.J.); (Z.W.)
- China Wine Industry Technology Institute, Yinchuan 750021, China
- Shaanxi Engineering Research Center for Viti-Viniculture, Xianyang 712100, China
- Engineering Research Center for Viti-Viniculture, National Forestry and Grassland Administration, Xianyang 712100, China
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Zelman AK, Berkowitz GA. Plant Elicitor Peptide (Pep) Signaling and Pathogen Defense in Tomato. PLANTS (BASEL, SWITZERLAND) 2023; 12:2856. [PMID: 37571010 PMCID: PMC10421127 DOI: 10.3390/plants12152856] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 07/03/2023] [Accepted: 07/22/2023] [Indexed: 08/13/2023]
Abstract
Endogenous signaling compounds are intermediaries in signaling pathways that plants use to respond to the perception of harmful and beneficial organisms. The plant elicitor peptides (Peps) of plants are important endogenous signaling molecules that induce elements of defense responses such as hormone production, increased expression of defensive genes, the activation of phosphorelays, and the induction of cell secondary messenger synthesis. The processes by which Peps confer resistance to pathogenic microorganisms have been extensively studied in Arabidopsis but are less known in crop plants. Tomato and many other solanaceous plants have an endogenous signaling polypeptide, systemin, that is involved in the defense against herbivorous insects and necrotrophic pathogens. This paper explores the similarity of the effects and chemical properties of Pep and systemin in tomato. Additionally, the relationship of the Pep receptor and systemin receptors is explored, and the identification of a second tomato Pep receptor in the literature is called into question. We suggest future directions for research on Pep signaling in solanaceous crops during interactions with microbes.
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Affiliation(s)
| | - Gerald Alan Berkowitz
- Department of Plant Science and Landscape Architecture, University of Connecticut, Storrs, CT 06269, USA;
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Wang J, Liu S, Ren P, Jia F, Kang F, Wang R, Xue R, Yan X, Huang L. A novel protein elicitor (PeSy1) from Saccharothrix yanglingensis induces plant resistance and interacts with a receptor-like cytoplasmic kinase in Nicotiana benthamiana. MOLECULAR PLANT PATHOLOGY 2023; 24:436-451. [PMID: 36872468 PMCID: PMC10098051 DOI: 10.1111/mpp.13312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/04/2022] [Revised: 12/28/2022] [Accepted: 01/30/2023] [Indexed: 05/03/2023]
Abstract
Previously, we reported a rare actinomycete Saccharothrix yanglingensis Hhs.015 with strong biocontrol ability, which can colonize plant tissues and induce resistance, but the key elicitor and immune mechanisms were unclear. In this study, a novel protein elicitor screened from the genome of Hhs.015, PeSy1 (protein elicitor of S. yanglingensis 1), could induce a strong hypersensitive response (HR) and resistance in plants. The PeSy1 gene encodes an 11 kDa protein with 109 amino acids that is conserved in Saccharothrix species. PeSy1-His recombinant protein induced early defence events such as a cellular reactive oxygen species burst, callose deposition, and the activation of defence hormone signalling pathways, which enhanced Nicotiana benthamiana resistance to Sclerotinia sclerotiorum and Phytophthora capsici, and Solanum lycopersicum resistance to Pseudomonas syringae pv. tomato DC3000. Through pull-down and mass spectrometry, candidate proteins that interacted with PeSy1 were obtained from N. benthamiana. We confirmed the interaction between receptor-like cytoplasmic kinase RSy1 (Response to PeSy1) and PeSy1 using co-immunoprecipitation, bimolecular fluorescence complementation, and microscale thermophoresis. PeSy1 treatment promoted up-regulation of marker genes in pattern-triggered immunity. The cell death it elicited was dependent on the co-receptors NbBAK1 and NbSOBIR1, suggesting that PeSy1 acts as a microbe-associated molecular pattern from Hhs.015. Additionally, RSy1 positively regulated PeSy1-induced plants resistant to S. sclerotiorum. In conclusion, our results demonstrated a novel receptor-like cytoplasmic kinase in the plant perception of microbe-associated molecular patterns, and the potential of PeSy1 in induced resistance provided a new strategy for biological control of actinomycetes in agricultural diseases.
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Affiliation(s)
- Jianxun Wang
- College of Life ScienceNorthwest A&F UniversityYanglingChina
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingChina
| | - Shang Liu
- College of Life ScienceNorthwest A&F UniversityYanglingChina
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingChina
| | - Peng Ren
- College of Life ScienceNorthwest A&F UniversityYanglingChina
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingChina
| | - Fengguo Jia
- College of Life ScienceNorthwest A&F UniversityYanglingChina
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingChina
| | - Feng Kang
- College of Life ScienceNorthwest A&F UniversityYanglingChina
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingChina
| | - Ruolin Wang
- College of Life ScienceNorthwest A&F UniversityYanglingChina
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingChina
| | - Renzheng Xue
- College of Life ScienceNorthwest A&F UniversityYanglingChina
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingChina
| | - Xia Yan
- College of Life ScienceNorthwest A&F UniversityYanglingChina
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingChina
| | - Lili Huang
- State Key Laboratory of Crop Stress Biology for Arid AreasNorthwest A&F UniversityYanglingChina
- College of Plant ProtectionNorthwest A&F UniversityYanglingChina
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7
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Yi SY, Lee M, Park SK, Lu L, Lee G, Kim SG, Kang SY, Lim YP. Jasmonate regulates plant resistance to Pectobacterium brasiliense by inducing indole glucosinolate biosynthesis. FRONTIERS IN PLANT SCIENCE 2022; 13:964092. [PMID: 36247644 PMCID: PMC9559233 DOI: 10.3389/fpls.2022.964092] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 09/08/2022] [Indexed: 05/31/2023]
Abstract
Pectobacterium brasiliense (P. brasiliense) is a necrotrophic bacterium that causes the soft rot disease in Brassica rapa. However, the mechanisms underlying plant immune responses against necrotrophic bacterial pathogens with a broad host range are still not well understood. Using a flg22-triggered seedling growth inhibition (SGI) assay with 455 Brassica rapa inbred lines, we selected six B. rapa flagellin-insensitive lines (Brfin2-7) and three B. rapa flagellin-sensitive lines (Brfs1-3). Brfin lines showed compromised flg22-induced immune responses (oxidative burst, mitogen-activated protein kinase (MAPK) activation, and seedling growth inhibition) compared to the control line R-o-18; nevertheless, they were resistant to P. brasiliense. To explain this, we analyzed the phytohormone content and found that most Brfin lines had higher P. brasiliense-induced jasmonic acid (JA) than Brfs lines. Moreover, MeJA pretreatment enhanced the resistance of B. rapa to P. brasiliense. To explain the correlation between the resistance of Brfin lines to P. brasiliense and activated JA signaling, we analyzed pathogen-induced glucosinolate (GS) content in B. rapa. Notably, in Brfin7, the neoglucobrassicin (NGBS) content among indole glucosinolates (IGS) was significantly higher than that in Brfs2 following P. brasiliense inoculation, and genes involved in IGSs biosynthesis were also highly expressed. Furthermore, almost all Brfin lines with high JA levels and resistance to P. brasiliense had higher P. brasiliense-induced NGBS levels than Brfs lines. Thus, our results show that activated JA-mediated signaling attenuates flg22-triggered immunity but enhances resistance to P. brasiliense by inducing indole glucosinolate biosynthesis in Brassica rapa. This study provides novel insights into the role of JA-mediated defense against necrotrophic bacterial pathogens within a broad host range.
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Affiliation(s)
- So Young Yi
- Institute of Agricultural Science, Chungnam National University, Daejeon, South Korea
- Research Center of Crop Breeding for Omics and Artificial Intelligence, Kongju National University, Yesan, South Korea
| | - Myungjin Lee
- Institute of Agricultural Science, Chungnam National University, Daejeon, South Korea
| | - Sun Kyu Park
- Molecular Genetics and Genomics Laboratory, Department of Horticulture, Chungnam National University, Daejeon, South Korea
| | - Lu Lu
- Molecular Genetics and Genomics Laboratory, Department of Horticulture, Chungnam National University, Daejeon, South Korea
| | - Gisuk Lee
- Department of Biological Sciences, Korea Advanced Institute for Science and Technology, Daejeon, South Korea
| | - Sang-Gyu Kim
- Department of Biological Sciences, Korea Advanced Institute for Science and Technology, Daejeon, South Korea
| | - Si-Yong Kang
- Department of Horticulture, College of Industrial Sciences, Kongju National University, Yesan, South Korea
- Research Center of Crop Breeding for Omics and Artificial Intelligence, Kongju National University, Yesan, South Korea
| | - Yong Pyo Lim
- Molecular Genetics and Genomics Laboratory, Department of Horticulture, Chungnam National University, Daejeon, South Korea
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Offor BC, Mhlongo MI, Dubery IA, Piater LA. Plasma Membrane-Associated Proteins Identified in Arabidopsis Wild Type, lbr2-2 and bak1-4 Mutants Treated with LPSs from Pseudomonas syringae and Xanthomonas campestris. MEMBRANES 2022; 12:membranes12060606. [PMID: 35736313 PMCID: PMC9230897 DOI: 10.3390/membranes12060606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 06/06/2022] [Accepted: 06/06/2022] [Indexed: 02/01/2023]
Abstract
Plants recognise bacterial microbe-associated molecular patterns (MAMPs) from the environment via plasma membrane (PM)-localised pattern recognition receptor(s) (PRRs). Lipopolysaccharides (LPSs) are known as MAMPs from gram-negative bacteria that are most likely recognised by PRRs and trigger defence responses in plants. The Arabidopsis PRR(s) and/or co-receptor(s) complex for LPS and the associated defence signalling remains elusive. As such, proteomic identification of LPS receptors and/or co-receptor complexes will help to elucidate the molecular mechanisms that underly LPS perception and defence signalling in plants. The Arabidopsis LPS-binding protein (LBP) and bactericidal/permeability-increasing protein (BPI)-related-2 (LBR2) have been shown to recognise LPS and trigger defence responses while brassinosteroid insensitive 1 (BRI1)-associated receptor kinase 1 (BAK1) acts as a co-receptor for several PRRs. In this study, Arabidopsis wild type (WT) and T-DNA knock out mutants (lbr2-2 and bak1-4) were treated with LPS chemotypes from Pseudomonas syringae pv. tomato DC3000 (Pst) and Xanthomonas campestris pv. campestris 8004 (Xcc) over a 24 h period. The PM-associated protein fractions were separated by liquid chromatography and analysed by tandem mass spectrometry (LC-MS/MS) followed by data analysis using ByonicTM software. Using Gene Ontology (GO) for molecular function and biological processes, significant LPS-responsive proteins were grouped according to defence and stress response, perception and signalling, membrane transport and trafficking, metabolic processes and others. Venn diagrams demarcated the MAMP-responsive proteins that were common and distinct to the WT and mutant lines following treatment with the two LPS chemotypes, suggesting contributions from differential LPS sub-structural moieties and involvement of LBR2 and BAK1 in the LPS-induced MAMP-triggered immunity (MTI). Moreover, the identification of RLKs and RLPs that participate in other bacterial and fungal MAMP signalling proposes the involvement of more than one receptor and/or co-receptor for LPS perception as well as signalling in Arabidopsis defence responses.
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9
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Fulgione A, Neto C, Elfarargi AF, Tergemina E, Ansari S, Göktay M, Dinis H, Döring N, Flood PJ, Rodriguez-Pacheco S, Walden N, Koch MA, Roux F, Hermisson J, Hancock AM. Parallel reduction in flowering time from de novo mutations enable evolutionary rescue in colonizing lineages. Nat Commun 2022; 13:1461. [PMID: 35304466 PMCID: PMC8933414 DOI: 10.1038/s41467-022-28800-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Accepted: 02/07/2022] [Indexed: 12/11/2022] Open
Abstract
Understanding how populations adapt to abrupt environmental change is necessary to predict responses to future challenges, but identifying specific adaptive variants, quantifying their responses to selection and reconstructing their detailed histories is challenging in natural populations. Here, we use Arabidopsis from the Cape Verde Islands as a model to investigate the mechanisms of adaptation after a sudden shift to a more arid climate. We find genome-wide evidence of adaptation after a multivariate change in selection pressures. In particular, time to flowering is reduced in parallel across islands, substantially increasing fitness. This change is mediated by convergent de novo loss of function of two core flowering time genes: FRI on one island and FLC on the other. Evolutionary reconstructions reveal a case where expansion of the new populations coincided with the emergence and proliferation of these variants, consistent with models of rapid adaptation and evolutionary rescue. Detailing how populations adapted to environmental change is needed to predict future responses, but identifying adaptive variants and detailing their fitness effects is rare. Here, the authors show that parallel loss of FRI and FLC function reduces time to flowering and drives adaptation in a drought prone environment.
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Affiliation(s)
- Andrea Fulgione
- Max Planck Institute for Plant Breeding Research, Cologne, Germany.,Mathematics and Bioscience, Department of Mathematics and Max F. Perutz Labs, University of Vienna, Vienna, Austria.,Vienna Graduate School for Population Genetics, Vienna, Austria
| | - Célia Neto
- Max Planck Institute for Plant Breeding Research, Cologne, Germany
| | | | | | - Shifa Ansari
- Max Planck Institute for Plant Breeding Research, Cologne, Germany
| | - Mehmet Göktay
- Max Planck Institute for Plant Breeding Research, Cologne, Germany
| | - Herculano Dinis
- Parque Natural do Fogo, Direção Nacional do Ambiente, Praia, Santiago, Cabo Verde.,Associação Projecto Vitó, São Filipe, Fogo, Cabo Verde
| | - Nina Döring
- Max Planck Institute for Plant Breeding Research, Cologne, Germany
| | - Pádraic J Flood
- Max Planck Institute for Plant Breeding Research, Cologne, Germany
| | | | - Nora Walden
- Centre for Organismal Studies (COS) Heidelberg, Biodiversity and Plant Systematics, Heidelberg University, Heidelberg, Germany.,Biosystematics, Wageningen University, Wageningen, The Netherlands
| | - Marcus A Koch
- Centre for Organismal Studies (COS) Heidelberg, Biodiversity and Plant Systematics, Heidelberg University, Heidelberg, Germany
| | - Fabrice Roux
- LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France
| | - Joachim Hermisson
- Mathematics and Bioscience, Department of Mathematics and Max F. Perutz Labs, University of Vienna, Vienna, Austria
| | - Angela M Hancock
- Max Planck Institute for Plant Breeding Research, Cologne, Germany. .,Mathematics and Bioscience, Department of Mathematics and Max F. Perutz Labs, University of Vienna, Vienna, Austria.
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10
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Genome of the world's smallest flowering plant, Wolffia australiana, helps explain its specialized physiology and unique morphology. Commun Biol 2021; 4:900. [PMID: 34294872 PMCID: PMC8298427 DOI: 10.1038/s42003-021-02422-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 06/17/2021] [Indexed: 11/17/2022] Open
Abstract
Watermeal, Wolffia australiana, is the smallest known flowering monocot and is rich in protein. Despite its great potential as a biotech crop, basic research on Wolffia is in its infancy. Here, we generated the reference genome of a species of watermeal, W. australiana, and identified the genome-wide features that may contribute to its atypical anatomy and physiology, including the absence of roots, adaxial stomata development, and anaerobic life as a turion. In addition, we found evidence of extensive genome rearrangements that may underpin the specialized aquatic lifestyle of watermeal. Analysis of the gene inventory of this intriguing species helps explain the distinct characteristics of W. australiana and its unique evolutionary trajectory. Halim Park and Jin Hwa Park et al. report the nuclear genome sequence of the duckweed Wolffia australiana, the smallest known flowering plant. The genome assembly represents an improvement over a recently published genome and highlights genome rearrangements that may be linked to its specialized aquatic adaptations.
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11
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Winkelmüller TM, Entila F, Anver S, Piasecka A, Song B, Dahms E, Sakakibara H, Gan X, Kułak K, Sawikowska A, Krajewski P, Tsiantis M, Garrido-Oter R, Fukushima K, Schulze-Lefert P, Laurent S, Bednarek P, Tsuda K. Gene expression evolution in pattern-triggered immunity within Arabidopsis thaliana and across Brassicaceae species. THE PLANT CELL 2021; 33:1863-1887. [PMID: 33751107 PMCID: PMC8290292 DOI: 10.1093/plcell/koab073] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 02/24/2021] [Indexed: 05/20/2023]
Abstract
Plants recognize surrounding microbes by sensing microbe-associated molecular patterns (MAMPs) to activate pattern-triggered immunity (PTI). Despite their significance for microbial control, the evolution of PTI responses remains largely uncharacterized. Here, by employing comparative transcriptomics of six Arabidopsis thaliana accessions and three additional Brassicaceae species to investigate PTI responses, we identified a set of genes that commonly respond to the MAMP flg22 and genes that exhibit species-specific expression signatures. Variation in flg22-triggered transcriptome responses across Brassicaceae species was incongruent with their phylogeny, while expression changes were strongly conserved within A. thaliana. We found the enrichment of WRKY transcription factor binding sites in the 5'-regulatory regions of conserved and species-specific responsive genes, linking the emergence of WRKY-binding sites with the evolution of gene expression patterns during PTI. Our findings advance our understanding of the evolution of the transcriptome during biotic stress.
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Affiliation(s)
- Thomas M Winkelmüller
- Department of Plant–Microbe Interactions, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
| | - Frederickson Entila
- Department of Plant–Microbe Interactions, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
| | - Shajahan Anver
- Department of Plant–Microbe Interactions, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
- Present address: Department of Genetics, Evolution and Environment, University College London, London, UK
| | - Anna Piasecka
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, 61-704 Poznan, Poland
| | - Baoxing Song
- Department of Comparative Development and Genetics, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
- Present address: Institute for Genomic Diversity, Cornell University, Ithaca, New York
| | - Eik Dahms
- Department of Plant–Microbe Interactions, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
| | - Hitoshi Sakakibara
- RIKEN Center for Sustainable Resource Science, 230-0045 Yokohama, Japan
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
| | - Xiangchao Gan
- Department of Comparative Development and Genetics, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
| | - Karolina Kułak
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, 61-704 Poznan, Poland
- Present address: Department of Computational Biology, Adam Mickiewicz University, 61-614 Poznań, Poland
| | - Aneta Sawikowska
- Department of Mathematical and Statistical Methods, Poznań University of Life Sciences, 60-628 Poznań, Poland
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, 61-704 Poznań, Poland
| | - Paweł Krajewski
- Institute of Plant Genetics, Polish Academy of Sciences, 60-479 Poznań, Poland
| | - Miltos Tsiantis
- Department of Comparative Development and Genetics, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
| | - Ruben Garrido-Oter
- Department of Plant–Microbe Interactions, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
| | - Kenji Fukushima
- Institute for Molecular Plant Physiology and Biophysics, University of Würzburg, 97082 Würzburg, Germany
| | - Paul Schulze-Lefert
- Department of Plant–Microbe Interactions, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
| | - Stefan Laurent
- Department of Comparative Development and Genetics, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
| | - Paweł Bednarek
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, 61-704 Poznan, Poland
| | - Kenichi Tsuda
- State Key Laboratory of Agricultural Microbiology, College of Plant Science and Technology, Interdisciplinary Science Research Institute, Huazhong Agricultural University, 430070 Wuhan, China
- The Provincial Key Lab of Plant Pathology of Hubei Province, Huazhong Agricultural University, 430070 Wuhan, China
- Department of Plant–Microbe Interactions, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
- Author for correspondence:
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12
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Xia T, Yang Y, Zheng H, Han X, Jin H, Xiong Z, Qian W, Xia L, Ji X, Li G, Wang D, Zhang K. Efficient expression and function of a receptor-like kinase in wheat powdery mildew defence require an intron-located MYB binding site. PLANT BIOTECHNOLOGY JOURNAL 2021; 19:897-909. [PMID: 33225586 PMCID: PMC8131041 DOI: 10.1111/pbi.13512] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 11/05/2020] [Accepted: 11/11/2020] [Indexed: 05/10/2023]
Abstract
The LRK10-like receptor kinases (LRK10L-RLKs) are ubiquitously present in higher plants, but knowledge of their expression and function is still limited. Here, we report expression and functional analysis of TtdLRK10L-1, a typical LRK10L-RLK in durum wheat (Triticum turgidum L. ssp. durum). The introns of TtdLRK10L-1 contained multiple kinds of predicted cis-elements. To investigate the potential effect of these cis-elements on TtdLRK10L-1 expression and function, two types of transgenic wheat lines were prepared, which expressed a GFP-tagged TtdLRK10L-1 protein (TtdLRK10L-1:GFP) from the cDNA or genomic DNA (gDNA) sequence of TtdLRK10L-1 under the native promoter. TtdLRK10L-1:GFP expression was up-regulated by the powdery mildew pathogen Blumeria graminis f. sp. tritici (Bgt) in both types of transgenic plants, with the scale of the elevation being much stronger in the gDNA lines. Both types of transgenic plants exhibited enhanced resistance to Bgt infection relative to wild type control. Notably, the Bgt defence activated in the gDNA lines was significantly stronger than that in the cDNA lines. Further analysis revealed that a putative MYB transcription factor binding site (MYB-BS, CAGTTA) located in TtdLRK10L-1 intron I was critical for the efficient expression and function of TtdLRK10L-1 in Bgt defence. This MYB-BS could also increase the activity of a superpromoter widely used in ectopic gene expression studies in plants. Together, our results deepen the understanding of the expression and functional characteristics of LRK10L-RLKs. TtdLRK10L-1 is likely useful for further dissecting the molecular processes underlying wheat defence against Bgt and for developing Bgt resistant wheat crops.
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Affiliation(s)
- Tengfei Xia
- College of AgronomyState Key Laboratory of Wheat and Maize Crop Science, and Center for Crop Genome EngineeringHenan Agricultural UniversityZhengzhouChina
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
| | - Yanping Yang
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
- University of Chinese Academy of SciencesBeijingChina
| | - Hongyuan Zheng
- College of AgronomyState Key Laboratory of Wheat and Maize Crop Science, and Center for Crop Genome EngineeringHenan Agricultural UniversityZhengzhouChina
| | - Xinyun Han
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
| | - Huaibing Jin
- College of AgronomyState Key Laboratory of Wheat and Maize Crop Science, and Center for Crop Genome EngineeringHenan Agricultural UniversityZhengzhouChina
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
| | - Zijun Xiong
- College of AgronomyState Key Laboratory of Wheat and Maize Crop Science, and Center for Crop Genome EngineeringHenan Agricultural UniversityZhengzhouChina
| | - Weiqiang Qian
- State Key Laboratory of Protein and Plant Gene ResearchSchool of Life SciencesPeking UniversityBeijingChina
| | - Lanqi Xia
- Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijingChina
| | - Xiang Ji
- College of AgronomyState Key Laboratory of Wheat and Maize Crop Science, and Center for Crop Genome EngineeringHenan Agricultural UniversityZhengzhouChina
| | - Guangwei Li
- College of AgronomyState Key Laboratory of Wheat and Maize Crop Science, and Center for Crop Genome EngineeringHenan Agricultural UniversityZhengzhouChina
| | - Daowen Wang
- College of AgronomyState Key Laboratory of Wheat and Maize Crop Science, and Center for Crop Genome EngineeringHenan Agricultural UniversityZhengzhouChina
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
- University of Chinese Academy of SciencesBeijingChina
| | - Kunpu Zhang
- College of AgronomyState Key Laboratory of Wheat and Maize Crop Science, and Center for Crop Genome EngineeringHenan Agricultural UniversityZhengzhouChina
- State Key Laboratory of Plant Cell and Chromosome EngineeringInstitute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina
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13
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Steinbrenner AD. The evolving landscape of cell surface pattern recognition across plant immune networks. CURRENT OPINION IN PLANT BIOLOGY 2020; 56:135-146. [PMID: 32615401 DOI: 10.1016/j.pbi.2020.05.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 04/30/2020] [Accepted: 05/04/2020] [Indexed: 06/11/2023]
Abstract
To recognize diverse threats, plants monitor extracellular molecular patterns and transduce intracellular immune signaling through receptor complexes at the plasma membrane. Pattern recognition occurs through a prototypical network of interacting proteins, comprising A) receptors that recognize inputs associated with a growing number of pest and pathogen classes (bacteria, fungi, oomycetes, caterpillars), B) co-receptor kinases that participate in binding and signaling, and C) cytoplasmic kinases that mediate first stages of immune output. While this framework has been elucidated in reference accessions of model organisms, network components are part of gene families with widespread variation, potentially tuning immunocompetence for specific contexts. Most dramatically, variation in receptor repertoires determines the range of ligands acting as immunogenic inputs for a given plant. Diversification of receptor kinase (RK) and related receptor-like protein (RLP) repertoires may tune responses even within a species. Comparative genomics at pangenome scale will reveal patterns and features of immune network variation.
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Affiliation(s)
- Adam D Steinbrenner
- Department of Biology, University of Washington, Seattle WA 98195, USA; Washington Research Foundation, Seattle, WA 98102, USA.
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14
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Cheng Q, Xiao H, Xiong Q. Conserved exitrons of FLAGELLIN-SENSING 2 (FLS2) across dicot plants and their functions. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2020; 296:110507. [PMID: 32540022 DOI: 10.1016/j.plantsci.2020.110507] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Revised: 03/20/2020] [Accepted: 04/22/2020] [Indexed: 06/11/2023]
Abstract
The alternative splicing of pattern recognition receptor genes regulates immune signalling in mammals, but in plants its role is still unknown. Here, we detected alternatively spliced introns (exitrons) in the first annotated exons of FLAGELLIN-SENSING 2 (FLS2) genes in all the examined dicot plants across nine families. The 5' splice site (SS) regions were conserved and with rare synonymous substitutions. Point mutations and gene swaps indicated that the position and efficiency of exitron splicing primarily depended on the nucleotide sequences of FLS2 genes. Single-nucleotide mutations in the invariable codon carrying 5' SS dramatically altered the accumulation of poplar and tomato FLS2 transcripts, indicating the 5'-proximal exitrons of FLS2 function as stimulatory introns on gene expression. The 3' SSs of exitrons are diverse and can be changed by 1-2 nucleotide mutations in Salicaceae FLS2. The alternative transcripts (ATs) of poplar and tobacco FLS2, which encode small secreted proteins, were specifically induced by flg22, and one such AT from tobacco FLS2 suppressed flg22-induced response. Our results indicated that the exitrons of FLS2 genes regulate the accumulation of transcripts by an intron mediated enhancement (IME) mechanism and some ATs have the potential to encode suppressors for FLS2 pathway.
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Affiliation(s)
- Qiang Cheng
- Key Laboratory of Forest Genetics & Biotechnology of Ministry of Education, Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China.
| | - Hongju Xiao
- Key Laboratory of Forest Genetics & Biotechnology of Ministry of Education, Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China
| | - Qin Xiong
- Key Laboratory of Forest Genetics & Biotechnology of Ministry of Education, Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China
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15
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Offor BC, Dubery IA, Piater LA. Prospects of Gene Knockouts in the Functional Study of MAMP-Triggered Immunity: A Review. Int J Mol Sci 2020; 21:ijms21072540. [PMID: 32268496 PMCID: PMC7177850 DOI: 10.3390/ijms21072540] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 03/31/2020] [Accepted: 04/01/2020] [Indexed: 12/27/2022] Open
Abstract
Plants depend on both preformed and inducible defence responses to defend themselves against biotic stresses stemming from pathogen attacks. In this regard, plants perceive pathogenic threats from the environment through pattern recognition receptors (PRRs) that recognise microbe-associated molecular patterns (MAMPs), and so induce plant defence responses against invading pathogens. Close to thirty PRR proteins have been identified in plants, however, the molecular mechanisms underlying MAMP perception by these receptors/receptor complexes are not fully understood. As such, knockout (KO) of genes that code for PRRs and co-receptors/defence-associated proteins is a valuable tool to study plant immunity. The loss of gene activity often causes changes in the phenotype of the model plant, allowing in vivo studies of gene function and associated biological mechanisms. Here, we review the functions of selected PRRs, brassinosteroid insensitive 1 (BRI1) associated receptor kinase 1 (BAK1) and other associated defence proteins that have been identified in plants, and also outline KO lines generated by T-DNA insertional mutagenesis as well as the effect on MAMP perception—and triggered immunity (MTI). In addition, we further review the role of membrane raft domains in flg22-induced MTI in Arabidopsis, due to the vital role in the activation of several proteins that are part of the membrane raft domain theory in this regard.
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Affiliation(s)
- Benedict C Offor
- Department of Biochemistry, University of Johannesburg, Auckland Park 2006, South Africa
| | - Ian A Dubery
- Department of Biochemistry, University of Johannesburg, Auckland Park 2006, South Africa
| | - Lizelle A Piater
- Department of Biochemistry, University of Johannesburg, Auckland Park 2006, South Africa
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16
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Biel A, Moser M, Meier I. A Role for Plant KASH Proteins in Regulating Stomatal Dynamics. PLANT PHYSIOLOGY 2020; 182:1100-1113. [PMID: 31767690 PMCID: PMC6997697 DOI: 10.1104/pp.19.01010] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Accepted: 11/10/2019] [Indexed: 05/19/2023]
Abstract
Stomatal movement, which regulates gas exchange in plants, is controlled by a variety of environmental factors, including biotic and abiotic stresses. The stress hormone abscisic acid (ABA) initiates a signaling cascade, which leads to increased H2O2 and Ca2+ levels and F-actin reorganization, but the mechanism of, and connection between, these events is unclear. SINE1, an outer nuclear envelope component of a plant Linker of Nucleoskeleton and Cytoskeleton complex, associates with F-actin and is, along with its putative paralog SINE2, expressed in guard cells. Here, we have determined that Arabidopsis (Arabidopsis thaliana) SINE1 and SINE2 play an important role in stomatal opening and closing. Loss of SINE1 or SINE2 results in ABA hyposensitivity and impaired stomatal dynamics but does not affect stomatal closure induced by the bacterial elicitor flg22. The ABA-induced stomatal closure phenotype is, in part, attributed to impairments in Ca2+ and F-actin regulation. Together, the data suggest that SINE1 and SINE2 act downstream of ABA but upstream of Ca2+ and F-actin. While there is a large degree of functional overlap between the two proteins, there are also critical differences. Our study makes an unanticipated connection between stomatal regulation and nuclear envelope-associated proteins, and adds two new players to the increasingly complex system of guard cell regulation.
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Affiliation(s)
- Alecia Biel
- Department of Molecular Genetics, The Ohio State University, Columbus, Ohio 43210
| | - Morgan Moser
- Department of Molecular Genetics, The Ohio State University, Columbus, Ohio 43210
| | - Iris Meier
- Department of Molecular Genetics, The Ohio State University, Columbus, Ohio 43210
- Center for RNA Biology, The Ohio State University, Columbus, Ohio 43210
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17
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Noman A, Aqeel M, Lou Y. PRRs and NB-LRRs: From Signal Perception to Activation of Plant Innate Immunity. Int J Mol Sci 2019; 20:ijms20081882. [PMID: 30995767 PMCID: PMC6514886 DOI: 10.3390/ijms20081882] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 04/02/2019] [Accepted: 04/10/2019] [Indexed: 12/11/2022] Open
Abstract
To ward off pathogens and pests, plants use a sophisticated immune system. They use pattern-recognition receptors (PRRs), as well as nucleotide-binding and leucine-rich repeat (NB-LRR) domains, for detecting nonindigenous molecular signatures from pathogens. Plant PRRs induce local and systemic immunity. Plasma-membrane-localized PRRs are the main components of multiprotein complexes having additional transmembrane and cytosolic kinases. Topical research involving proteins and their interactive partners, along with transcriptional and posttranscriptional regulation, has extended our understanding of R-gene-mediated plant immunity. The unique LRR domain conformation helps in the best utilization of a surface area and essentially mediates protein–protein interactions. Genome-wide analyses of inter- and intraspecies PRRs and NB-LRRs offer innovative information about their working and evolution. We reviewed plant immune responses with relevance to PRRs and NB-LRRs. This article focuses on the significant functional diversity, pathogen-recognition mechanisms, and subcellular compartmentalization of plant PRRs and NB-LRRs. We highlight the potential biotechnological application of PRRs and NB-LRRs to enhance broad-spectrum disease resistance in crops.
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Affiliation(s)
- Ali Noman
- Institute of Insect Sciences, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310027, China.
- Department of Botany, Government College University, Faisalabad 38000, Pakistan.
| | - Muhammad Aqeel
- State Key Laboratory of Grassland Agro-ecosystems, School of Life Science, Lanzhou University, Lanzhou 730000, China.
| | - Yonggen Lou
- Institute of Insect Sciences, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310027, China.
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18
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Jang YJ, Seo M, Hersh CP, Rhee SJ, Kim Y, Lee GP. An evolutionarily conserved non-synonymous SNP in a leucine-rich repeat domain determines anthracnose resistance in watermelon. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2019; 132:473-488. [PMID: 30446794 DOI: 10.1007/s00122-018-3235-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 11/07/2018] [Indexed: 06/09/2023]
Abstract
A non-synonymous SNP of CC-NBS-LRR was firstly mapped to confer resistance to anthracnose in watermelon. Newly proposed LRR domain harboring the SNP is evolutionary conserved in the Cucurbitaceae and Fabaceae. Anthracnose disease caused by Colletotrichum devastates many plants. Despite the importance of the disease, the mechanisms of resistance against it are poorly understood. Here, we identified a non-synonymous single-nucleotide polymorphism (SNP) located in a leucine-rich repeat domain as a marker for resistance to anthracnose race 1 in watermelon, using a combination of genetic analyses. We validated this SNP in segregating populations and 59 watermelon accessions using high-resolution melting assays and Sanger sequencing. We demonstrated that the resulting arginine-to-lysine substitution is particularly conserved among the Cucurbitaceae and Fabaceae. We identified a conserved motif, IxxLPxSxxxLYNLQTLxL, found in 1007 orthologues/paralogues from 89 plant species, and discovered that residue 18 of this motif could determine resistance to disease caused by external invaders. This study provides a step forward in understanding anthracnose resistance in watermelon, as well as functional and evolutionary insight into leucine-rich repeat proteins.
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Affiliation(s)
- Yoon Jeong Jang
- Department of Integrative Plant Science, Chung-Ang University, Anseong, 17546, Republic of Korea
| | - Minseok Seo
- Channing Division of Network Medicine, Brigham and Women's Hospital, Boston, MA, 02115, USA
- Department of Medicine, Harvard Medical School, Boston, MA, 02115, USA
| | - Craig P Hersh
- Channing Division of Network Medicine, Brigham and Women's Hospital, Boston, MA, 02115, USA
- Department of Medicine, Harvard Medical School, Boston, MA, 02115, USA
| | - Sun-Ju Rhee
- Department of Plant Sciences, The University of Cambridge, Cambridge, CB2 3EA, UK
| | - Yongjae Kim
- Partner Seeds Co., Ltd., Anseong, 17601, Republic of Korea
| | - Gung Pyo Lee
- Department of Integrative Plant Science, Chung-Ang University, Anseong, 17546, Republic of Korea.
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19
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Hurst CH, Turnbull D, Myles SM, Leslie K, Keinath NF, Hemsley PA. Variable Effects of C-Terminal Fusions on FLS2 Function: Not All Epitope Tags Are Created Equal. PLANT PHYSIOLOGY 2018; 177:522-531. [PMID: 29686160 PMCID: PMC6001324 DOI: 10.1104/pp.17.01700] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Accepted: 04/06/2018] [Indexed: 05/26/2023]
Abstract
Receptor-like kinases (RLKs) are the largest family of proteins in plants and are responsible for perceiving the vast majority of extracellular stimuli. Thus, RLKs function in diverse processes, including sensing pathogen attacks, regulating symbiotic interactions, transducing hormone and peptide signals, and monitoring cell wall status. However, despite their fundamental role in plant biology, very few antibodies are available against RLKs, which necessitates the use of epitope tags and fluorescent protein fusions in biochemical analyses such as immunoblot analysis and intracellular visualization. Epitope tags are widely used and are typically assumed to be benign, with no influence on protein function. FLAGELLIN SENSITIVE2 (FLS2) is the receptor for bacterial flagellin and often is used as a model for RLK function. Previous work implies that carboxyl-terminal epitope fusions to FLS2 maintain protein function. Here, a detailed complementation analysis of Arabidopsis (Arabidopsis thaliana) fls2 mutant plants expressing various FLS2 C-terminal epitope fusions revealed highly variable and unpredictable FLS2-mediated signaling outputs. In addition, only one out of four FLS2 epitope fusions maintained the ability to inhibit plant growth in response to flg22 treatment comparable to that in the wild type or control untagged transgenic lines. These results raise concerns over the widespread use of RLK epitope tag fusions for functional studies. Many of the subtleties of FLS2 function, and by extension those of other RLKs, may have been overlooked or inappropriately interpreted through the use of RLK epitope tag fusions.
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Affiliation(s)
- Charlotte H Hurst
- Division of Plant Sciences, School of Life Sciences, University of Dundee, Dundee DD1 5EH, United Kingdom
- Cell and Molecular Sciences, James Hutton Institute, Invergowrie, Dundee DD2 5DA, United Kingdom
| | - Dionne Turnbull
- Division of Plant Sciences, School of Life Sciences, University of Dundee, Dundee DD1 5EH, United Kingdom
| | - Sally M Myles
- Division of Plant Sciences, School of Life Sciences, University of Dundee, Dundee DD1 5EH, United Kingdom
| | - Kerry Leslie
- Division of Plant Sciences, School of Life Sciences, University of Dundee, Dundee DD1 5EH, United Kingdom
- Cell and Molecular Sciences, James Hutton Institute, Invergowrie, Dundee DD2 5DA, United Kingdom
| | - Nana F Keinath
- Department of Plant Developmental Biology, Centre for Organismal Studies, Heidelberg University, 69120 Heidelberg, Germany
| | - Piers A Hemsley
- Division of Plant Sciences, School of Life Sciences, University of Dundee, Dundee DD1 5EH, United Kingdom
- Cell and Molecular Sciences, James Hutton Institute, Invergowrie, Dundee DD2 5DA, United Kingdom
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20
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A transcriptomics approach uncovers novel roles for poly(ADP-ribosyl)ation in the basal defense response in Arabidopsis thaliana. PLoS One 2017; 12:e0190268. [PMID: 29284022 PMCID: PMC5746271 DOI: 10.1371/journal.pone.0190268] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Accepted: 12/10/2017] [Indexed: 12/20/2022] Open
Abstract
Pharmacological inhibition of poly(ADP-ribose) polymerase (PARP) or loss of Arabidopsis thaliana PARG1 (poly(ADP-ribose) glycohydrolase) disrupt a subset of plant defenses. In the present study we examined the impact of altered poly(ADP-ribosyl)ation on early gene expression induced by the microbe-associate molecular patterns (MAMPs) flagellin (flg22) and EF-Tu (elf18). Stringent statistical analyses and filtering identified 178 genes having MAMP-induced mRNA abundance patterns that were altered by either PARP inhibitor 3-aminobenzamide (3AB) or PARG1 knockout. From the identified set of 178 genes, over fifty Arabidopsis T-DNA insertion lines were chosen and screened for altered basal defense responses. Subtle alterations in callose deposition and/or seedling growth in response to those MAMPs were observed in knockouts of At3g55630 (FPGS3, a cytosolic folylpolyglutamate synthetase), At5g15660 (containing an F-box domain), At1g47370 (a TIR-X (Toll-Interleukin Receptor domain)), and At5g64060 (a predicted pectin methylesterase inhibitor). Over-represented GO terms for the gene expression study included "innate immune response" for elf18/parg1, highlighting a subset of elf18-activated defense-associated genes whose expression is altered in parg1 plants. The study also allowed a tightly controlled comparison of early mRNA abundance responses to flg22 and elf18 in wild-type Arabidopsis, which revealed many differences. The PARP inhibitor 3-methoxybenzamide (3MB) was also used in the gene expression profiling, but pleiotropic impacts of this inhibitor were observed. This transcriptomics study revealed targets for further dissection of MAMP-induced plant immune responses, impacts of PARP inhibitors, and the molecular mechanisms by which poly(ADP-ribosyl)ation regulates plant responses to MAMPs.
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21
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Zhu M, Jiang L, Bai B, Zhao W, Chen X, Li J, Liu Y, Chen Z, Wang B, Wang C, Wu Q, Shen Q, Dinesh-Kumar SP, Tao X. The Intracellular Immune Receptor Sw-5b Confers Broad-Spectrum Resistance to Tospoviruses through Recognition of a Conserved 21-Amino Acid Viral Effector Epitope. THE PLANT CELL 2017; 29:2214-2232. [PMID: 28814646 PMCID: PMC5635987 DOI: 10.1105/tpc.17.00180] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 07/20/2017] [Accepted: 08/16/2017] [Indexed: 05/20/2023]
Abstract
Plants use both cell surface-resident pattern recognition receptors (PRRs) and intracellular nucleotide binding leucine-rich repeat (NLR) receptors to detect various pathogens. Plant PRRs typically recognize conserved pathogen-associated molecular patterns (PAMPs) to provide broad-spectrum resistance. By contrast, plant NLRs generally detect pathogen strain-specific effectors and confer race-specific resistance. Here, we demonstrate that the tomato (Solanum lycopersicum) NLR Sw-5b confers broad-spectrum resistance against American-type tospoviruses by recognizing a conserved 21-amino acid peptide region within viral movement protein NSm (NSm21). Sw-5b NB-ARC-LRR domains directly associate with NSm21 in vitro and in planta. Domain swap, site-directed mutagenesis and structure modeling analyses identified four polymorphic sites in the Sw-5b LRR domain that are critical for the recognition of NSm21 Furthermore, recognition of NSm21 by Sw-5b likely disturbs the residues adjacent to R927 in the LRR domain to weaken the intramolecular interaction between LRR and NB-ARC domains, thus translating recognition of NSm21 into activation of Sw-5b. Natural variation analysis of Sw-5b homologs from wild tomato species of South America revealed that the four polymorphic sites in the Sw-5b LRR domain were positively selected during evolution and are all necessary to confer resistance to tospovirus. The results described here provide a new example of a plant NLR mediating broad-spectrum resistance through recognition of a small conserved PAMP-like region within the pathogen effector.
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Affiliation(s)
- Min Zhu
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Lei Jiang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Baohui Bai
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Wenyang Zhao
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Xiaojiao Chen
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Jia Li
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Yong Liu
- Institute of Plant Protection, Hunan Academy of Agricultural Sciences, Changsha 410125, China
| | - Zhengqiang Chen
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Boting Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Chunli Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Qian Wu
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Qianhua Shen
- State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Savithramma P Dinesh-Kumar
- Department of Plant Biology and The Genome Center, College of Biological Sciences, University of California, Davis, California 95616
| | - Xiaorong Tao
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, P.R. China
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Abstract
Plants are sessile organisms exposed constantly to potential virulent microbes seeking for full pathogenesis in hosts. Different from animals employing both adaptive and innate immune systems, plants only rely on innate immunity to detect and fight against pathogen invasions. Plant innate immunity is proposed to be a two-tiered immune system including pathogen-associated molecular pattern (PAMP)-triggered immunity (PTI) and effector-triggered immunity. In PTI, PAMPs, the elicitors derived from microbial pathogens, are perceived by cell surface-localized proteins, known as pattern recognition receptors (PRRs), including receptor-like kinases (RLKs) and receptor-like proteins (RLPs). As single-pass transmembrane proteins, RLKs and RLPs contain an extracellular domain (ECD) responsible for ligand binding. Recognitions of signal molecules by PRR-ECDs induce homo- or heterooligomerization of RLKs and RLPs to trigger corresponding intracellular immune responses. RLKs possess a cytoplasmic Ser/Thr kinase domain that is absent in RLPs, implying that protein phosphorylations underlie key mechanism in transducing immunity signalings and that RLPs unlikely mediate signal transduction independently, and recruitment of other patterns, such as RLKs, is required for the function of RLPs in plant immunity. Receptor-like cytoplasmic kinases, resembling RLK structures but lacking the ECD, act as immediate substrates of PRRs, modulating PRR activities and linking PRRs with downstream signaling mediators. In this chapter, we summarize recent discoveries illustrating the molecular machines of major components of PRR complexes in mediating pathogen perception and immunity activation in plants.
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Affiliation(s)
- K He
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, China.
| | - Y Wu
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, China
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23
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Cheng Z. APseudomonas aeruginosa-secreted protease modulates host intrinsic immune responses, but how? Bioessays 2016; 38:1084-1092. [DOI: 10.1002/bies.201600101] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Zhenyu Cheng
- Department of Microbiology and Immunology; Dalhousie University; Halifax Nova Scotia Canada
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24
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Helft L, Thompson M, Bent AF. Directed Evolution of FLS2 towards Novel Flagellin Peptide Recognition. PLoS One 2016; 11:e0157155. [PMID: 27270917 PMCID: PMC4894583 DOI: 10.1371/journal.pone.0157155] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Accepted: 05/25/2016] [Indexed: 12/20/2022] Open
Abstract
Microbe-associated molecular patterns (MAMPs) are molecules, or domains within molecules, that are conserved across microbial taxa and can be recognized by a plant or animal immune system. Although MAMP receptors have evolved to recognize conserved epitopes, the MAMPs in some microbial species or strains have diverged sufficiently to render them unrecognizable by some host immune systems. In this study, we carried out in vitro evolution of the Arabidopsis thaliana flagellin receptor FLAGELLIN-SENSING 2 (FLS2) to isolate derivatives that recognize one or more flagellin peptides from bacteria for which the wild-type Arabidopsis FLS2 confers little or no response. A targeted approach generated amino acid variation at FLS2 residues in a region previously implicated in flagellin recognition. The primary screen tested for elevated response to the canonical flagellin peptide from Pseudomonas aeruginosa, flg22. From this pool, we then identified five alleles of FLS2 that confer modest (quantitatively partial) recognition of an Erwinia amylovora flagellin peptide. Use of this Erwinia-based flagellin peptide to stimulate Arabidopsis plants expressing the resulting FLS2 alleles did not lead to a detectable reduction of virulent P. syringae pv. tomato growth. However, combination of two identified mutations into a single allele further increased FLS2-mediated responses to the E. amylovora flagellin peptide. These studies demonstrate the potential to raise the sensitivity of MAMP receptors toward particular targets.
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Affiliation(s)
- Laura Helft
- Department of Plant Pathology, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
- Cellular and Molecular Biology Program, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - Mikayla Thompson
- Department of Plant Pathology, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - Andrew F. Bent
- Department of Plant Pathology, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
- * E-mail:
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25
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Roux F, Bergelson J. The Genetics Underlying Natural Variation in the Biotic Interactions of Arabidopsis thaliana: The Challenges of Linking Evolutionary Genetics and Community Ecology. Curr Top Dev Biol 2016; 119:111-56. [PMID: 27282025 DOI: 10.1016/bs.ctdb.2016.03.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
In the context of global change, predicting the responses of plant communities in an ever-changing biotic environment calls for a multipronged approach at the interface of evolutionary genetics and community ecology. However, our understanding of the genetic basis of natural variation involved in mediating biotic interactions, and associated adaptive dynamics of focal plants in their natural communities, is still in its infancy. Here, we review the genetic and molecular bases of natural variation in the response to biotic interactions (viruses, bacteria, fungi, oomycetes, herbivores, and plants) in the model plant Arabidopsis thaliana as well as the adaptive value of these bases. Among the 60 identified genes are a number that encode nucleotide-binding site leucine-rich repeat (NBS-LRR)-type proteins, consistent with early examples of plant defense genes. However, recent studies have revealed an extensive diversity in the molecular mechanisms of defense. Many types of genetic variants associate with phenotypic variation in biotic interactions, even among the genes of large effect that tend to be identified. In general, we found that (i) balancing selection rather than directional selection explains the observed patterns of genetic diversity within A. thaliana and (ii) the cost/benefit tradeoffs of adaptive alleles can be strongly dependent on both genomic and environmental contexts. Finally, because A. thaliana rarely interacts with only one biotic partner in nature, we highlight the benefit of exploring diffuse biotic interactions rather than tightly associated host-enemy pairs. This challenge would help to improve our understanding of coevolutionary quantitative genetics within the context of realistic community complexity.
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Affiliation(s)
- F Roux
- INRA, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR441, Castanet-Tolosan, France; CNRS, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR2594, Castanet-Tolosan, France.
| | - J Bergelson
- University of Chicago, Chicago, IL, United States
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26
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Gonzalez-Cendales Y, Catanzariti AM, Baker B, Mcgrath DJ, Jones DA. Identification of I-7 expands the repertoire of genes for resistance to Fusarium wilt in tomato to three resistance gene classes. MOLECULAR PLANT PATHOLOGY 2016; 17:448-63. [PMID: 26177154 PMCID: PMC6638478 DOI: 10.1111/mpp.12294] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The tomato I-3 and I-7 genes confer resistance to Fusarium oxysporum f. sp. lycopersici (Fol) race 3 and were introgressed into the cultivated tomato, Solanum lycopersicum, from the wild relative Solanum pennellii. I-3 has been identified previously on chromosome 7 and encodes an S-receptor-like kinase, but little is known about I-7. Molecular markers have been developed for the marker-assisted breeding of I-3, but none are available for I-7. We used an RNA-seq and single nucleotide polymorphism (SNP) analysis approach to map I-7 to a small introgression of S. pennellii DNA (c. 210 kb) on chromosome 8, and identified I-7 as a gene encoding a leucine-rich repeat receptor-like protein (LRR-RLP), thereby expanding the repertoire of resistance protein classes conferring resistance to Fol. Using an eds1 mutant of tomato, we showed that I-7, like many other LRR-RLPs conferring pathogen resistance in tomato, is EDS1 (Enhanced Disease Susceptibility 1) dependent. Using transgenic tomato plants carrying only the I-7 gene for Fol resistance, we found that I-7 also confers resistance to Fol races 1 and 2. Given that Fol race 1 carries Avr1, resistance to Fol race 1 indicates that I-7-mediated resistance, unlike I-2- or I-3-mediated resistance, is not suppressed by Avr1. This suggests that Avr1 is not a general suppressor of Fol resistance in tomato, leading us to hypothesize that Avr1 may be acting against an EDS1-independent pathway for resistance activation. The identification of I-7 has allowed us to develop molecular markers for marker-assisted breeding of both genes currently known to confer Fol race 3 resistance (I-3 and I-7). Given that I-7-mediated resistance is not suppressed by Avr1, I-7 may be a useful addition to I-3 in the tomato breeder's toolbox.
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Affiliation(s)
- Yvonne Gonzalez-Cendales
- Division of Plant Sciences, Research School of Biology, The Australian National University, 134 Linnaeus Way, Acton, ACT, 2601, Australia
| | - Ann-Maree Catanzariti
- Division of Plant Sciences, Research School of Biology, The Australian National University, 134 Linnaeus Way, Acton, ACT, 2601, Australia
| | - Barbara Baker
- Plant Gene Expression Center, University of California-Berkeley, 800 Buchanan Street, Albany, CA, 94710, USA
| | - Des J Mcgrath
- Agri-Science Queensland, Queensland Department of Agriculture and Fisheries, Gatton, Qld, 4343, Australia
| | - David A Jones
- Division of Plant Sciences, Research School of Biology, The Australian National University, 134 Linnaeus Way, Acton, ACT, 2601, Australia
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27
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Hao G, Pitino M, Duan Y, Stover E. Reduced Susceptibility to Xanthomonas citri in Transgenic Citrus Expressing the FLS2 Receptor From Nicotiana benthamiana. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2016; 29:132-42. [PMID: 26554734 DOI: 10.1094/mpmi-09-15-0211-r] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Overexpression of plant pattern-recognition receptors by genetic engineering provides a novel approach to enhance plant immunity and broad-spectrum disease resistance. Citrus canker disease associated with Xanthomonas citri is one of the most important diseases damaging citrus production worldwide. In this study, we cloned the FLS2 gene from Nicotiana benthamiana cDNA and inserted it into the binary vector pBinPlus/ARS to transform Hamlin sweet orange and Carrizo citrange. Transgene presence was confirmed by polymerase chain reaction (PCR) and gene expression of NbFLS2 was compared by reverse transcription quantitative PCR. Reactive oxygen species (ROS) production in response to flg22Xcc was detected in transgenic Hamlin but not in nontransformed controls. Low or no ROS production was detected from nontransformed Hamlin seedlings challenged with flg22Xcc. Transgenic plants highly expressing NbFLS2 were selected and were evaluated for resistance to canker incited by X. citri 3213. Our results showed that the integration and expression of the NbFLS2 gene in citrus can increase canker resistance and defense-associated gene expression when challenged with X. citri. These results suggest that canker-susceptible Citrus genotypes lack strong basal defense induced by X. citri flagellin and the resistance of these genotypes can be enhanced by transgenic expression of the flagellin receptor from a resistant species.
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Affiliation(s)
- Guixia Hao
- U. S. Horticultural Research Laboratory, USDA-ARS, Fort Pierce, FL 34945, U.S.A
| | - Marco Pitino
- U. S. Horticultural Research Laboratory, USDA-ARS, Fort Pierce, FL 34945, U.S.A
| | - Yongping Duan
- U. S. Horticultural Research Laboratory, USDA-ARS, Fort Pierce, FL 34945, U.S.A
| | - Ed Stover
- U. S. Horticultural Research Laboratory, USDA-ARS, Fort Pierce, FL 34945, U.S.A
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28
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Wang S, Sun Z, Wang H, Liu L, Lu F, Yang J, Zhang M, Zhang S, Guo Z, Bent AF, Sun W. Rice OsFLS2-Mediated Perception of Bacterial Flagellins Is Evaded by Xanthomonas oryzae pvs. oryzae and oryzicola. MOLECULAR PLANT 2015; 8:1024-37. [PMID: 25617720 DOI: 10.1016/j.molp.2015.01.012] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 01/10/2015] [Accepted: 01/11/2015] [Indexed: 05/26/2023]
Abstract
Bacterial flagellins are often recognized by the receptor kinase FLAGELLIN SENSITIVE2 (FLS2) and activate MAMP-triggered immunity in dicotyledonous plants. However, the capacity of monocotyledonous rice to recognize flagellins of key rice pathogens and its biological relevance remain poorly understood. We demonstrate that ectopically expressed OsFLS2 in Arabidopsis senses the eliciting flg22 peptide and in vitro purified Acidovorax avenae (Aa) flagellin in an expression level-dependent manner, but does not recognize purified flagellins or derivative flg22(Xo) peptides of Xanthomonas oryzae pvs. oryzae (Xoo) and oryzicola (Xoc). Consistently, the flg22 peptide and purified Aa flagellin, but not Xoo/Xoc flagellins, induce various immune responses such as defense gene induction and MAPK activation in rice. Perception of flagellin by rice does induce strong resistance to Xoo infection, as shown after pre-treatment of rice leaves with Aa flagellin. OsFLS2 was found to differ from AtFLS2 in its perception specificities or sensitivities to different flg22 sequences. In addition, post-translational modification of Xoc flagellin was altered by deletion of glycosyltransferase-encoding rbfC, but this had little effect on Xoc motility and rpfC mutation did not detectably reduce Xoc virulence on rice. Deletion of flagellin-encoding fliC from Xoo/Xoc blocked swimming motility but also did not significantly alter Xoo/Xoc virulence. These results suggest that Xoo/Xoc carry flg22-region amino acid changes that allow motility while evading the ancient flagellin detection system in rice, which retains recognition capacity for other bacterial pathogens.
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Affiliation(s)
- Shanzhi Wang
- Department of Plant Pathology, China Agricultural University, 2 West Yuanmingyuan Road, Haidian District, Beijing 100193, China; Key Laboratory of Plant Pathology, Ministry of Agriculture, China Agricultural University, Beijing 100193, China
| | - Zhe Sun
- Department of Plant Pathology, China Agricultural University, 2 West Yuanmingyuan Road, Haidian District, Beijing 100193, China; Key Laboratory of Plant Pathology, Ministry of Agriculture, China Agricultural University, Beijing 100193, China
| | - Huiqin Wang
- Department of Plant Pathology, China Agricultural University, 2 West Yuanmingyuan Road, Haidian District, Beijing 100193, China; Key Laboratory of Plant Pathology, Ministry of Agriculture, China Agricultural University, Beijing 100193, China
| | - Lijuan Liu
- Department of Plant Pathology, China Agricultural University, 2 West Yuanmingyuan Road, Haidian District, Beijing 100193, China; Key Laboratory of Plant Pathology, Ministry of Agriculture, China Agricultural University, Beijing 100193, China
| | - Fen Lu
- Department of Plant Pathology, China Agricultural University, 2 West Yuanmingyuan Road, Haidian District, Beijing 100193, China; Key Laboratory of Plant Pathology, Ministry of Agriculture, China Agricultural University, Beijing 100193, China
| | - Jun Yang
- Department of Plant Pathology, China Agricultural University, 2 West Yuanmingyuan Road, Haidian District, Beijing 100193, China; Rice Research Institute, Shandong Academy of Agricultural Science, Jinan 250100, Shandong Province, China
| | - Min Zhang
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, Hunan Province, China
| | - Shiyong Zhang
- Rice Research Institute, Shandong Academy of Agricultural Science, Jinan 250100, Shandong Province, China
| | - Zejian Guo
- Department of Plant Pathology, China Agricultural University, 2 West Yuanmingyuan Road, Haidian District, Beijing 100193, China; Key Laboratory of Plant Pathology, Ministry of Agriculture, China Agricultural University, Beijing 100193, China
| | - Andrew F Bent
- Department of Plant Pathology, University of Wisconsin, Madison, WI 53706, USA
| | - Wenxian Sun
- Department of Plant Pathology, China Agricultural University, 2 West Yuanmingyuan Road, Haidian District, Beijing 100193, China; Key Laboratory of Plant Pathology, Ministry of Agriculture, China Agricultural University, Beijing 100193, China.
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29
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Wang Y, Kwon SJ, Wu J, Choi J, Lee YH, Agrawal GK, Tamogami S, Rakwal R, Park SR, Kim BG, Jung KH, Kang KY, Kim SG, Kim ST. Transcriptome Analysis of Early Responsive Genes in Rice during Magnaporthe oryzae Infection. THE PLANT PATHOLOGY JOURNAL 2014; 30:343-54. [PMID: 25506299 PMCID: PMC4262287 DOI: 10.5423/ppj.oa.06.2014.0055] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Revised: 07/25/2014] [Accepted: 07/30/2014] [Indexed: 05/04/2023]
Abstract
Rice blast disease caused by Magnaporthe oryzae is one of the most serious diseases of cultivated rice (Oryza sativa L.) in most rice-growing regions of the world. In order to investigate early response genes in rice, we utilized the transcriptome analysis approach using a 300 K tilling microarray to rice leaves infected with compatible and incompatible M. oryzae strains. Prior to the microarray experiment, total RNA was validated by measuring the differential expression of rice defense-related marker genes (chitinase 2, barwin, PBZ1, and PR-10) by RT-PCR, and phytoalexins (sakuranetin and momilactone A) with HPLC. Microarray analysis revealed that 231 genes were up-regulated (>2 fold change, p < 0.05) in the incompatible interaction compared to the compatible one. Highly expressed genes were functionally characterized into metabolic processes and oxidation-reduction categories. The oxidative stress response was induced in both early and later infection stages. Biotic stress overview from MapMan analysis revealed that the phytohormone ethylene as well as signaling molecules jasmonic acid and salicylic acid is important for defense gene regulation. WRKY and Myb transcription factors were also involved in signal transduction processes. Additionally, receptor-like kinases were more likely associated with the defense response, and their expression patterns were validated by RT-PCR. Our results suggest that candidate genes, including receptor-like protein kinases, may play a key role in disease resistance against M. oryzae attack.
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Affiliation(s)
- Yiming Wang
- Department of Plant Microbe Interaction, Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Köln, Germany
| | - Soon Jae Kwon
- Department of Plant Bioscience, Life and Industry Convergence Research Institute, Pusan National University, Miryang 627-706, Republic of Korea
| | - Jingni Wu
- Department of Plant Microbe Interaction, Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Köln, Germany
| | - Jaeyoung Choi
- Department of Agricultural Biotechnology, Center for Fungal Genetic Resources and Center for Fungal Pathogenesis, Seoul National University, Seoul 151-921, Republic of Korea
| | - Yong-Hwan Lee
- Department of Agricultural Biotechnology, Center for Fungal Genetic Resources and Center for Fungal Pathogenesis, Seoul National University, Seoul 151-921, Republic of Korea
| | - Ganesh Kumar Agrawal
- Research Laboratory for Biotechnology and Biochemistry (RLABB), GPO Box 13265, Kathmandu, Nepal
- GRADE Academy Pvt. Ltd., Adarsh Nagar-13, Main Road, Birgunj, Nepal
| | - Shigeru Tamogami
- Laboratory of Biologically Active Compounds, Department of Biological Production, Akita Prefectural University, Akita 010-0195, Japan
| | - Randeep Rakwal
- Research Laboratory for Biotechnology and Biochemistry (RLABB), GPO Box 13265, Kathmandu, Nepal
- GRADE Academy Pvt. Ltd., Adarsh Nagar-13, Main Road, Birgunj, Nepal
- Organization for Educational Initiatives, University of Tsukuba, Tsukuba 305-8577, Ibaraki, Japan
| | - Sang-Ryeol Park
- Molecular Breeding Division, National Academy of Agricultural Science, RDA, Suwon 441-707, Republic of Korea
| | - Beom-Gi Kim
- Molecular Breeding Division, National Academy of Agricultural Science, RDA, Suwon 441-707, Republic of Korea
| | - Ki-Hong Jung
- Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University, Yongin 446-701, Republic of Korea
| | - Kyu Young Kang
- Plant Molecular Biology and Biotechnology Research Center/Division of Applied Life Science (BK21 Program), Gyeongsang National University, Jinju 660-701, Republic of Korea
| | - Sang Gon Kim
- Plant Molecular Biology and Biotechnology Research Center/Division of Applied Life Science (BK21 Program), Gyeongsang National University, Jinju 660-701, Republic of Korea
| | - Sun Tae Kim
- Department of Plant Bioscience, Life and Industry Convergence Research Institute, Pusan National University, Miryang 627-706, Republic of Korea
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30
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Koller T, Bent AF. FLS2-BAK1 extracellular domain interaction sites required for defense signaling activation. PLoS One 2014; 9:e111185. [PMID: 25356676 PMCID: PMC4214723 DOI: 10.1371/journal.pone.0111185] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2014] [Accepted: 09/27/2014] [Indexed: 11/19/2022] Open
Abstract
Signaling initiation by receptor-like kinases (RLKs) at the plasma membrane of plant cells often requires regulatory leucine-rich repeat (LRR) RLK proteins such as SERK or BIR proteins. The present work examined how the microbe-associated molecular pattern (MAMP) receptor FLS2 builds signaling complexes with BAK1 (SERK3). We first, using in vivo methods that validate separate findings by others, demonstrated that flg22 (flagellin epitope) ligand-initiated FLS2-BAK1 extracellular domain interactions can proceed independent of intracellular domain interactions. We then explored a candidate SERK protein interaction site in the extracellular domains (ectodomains; ECDs) of the significantly different receptors FLS2, EFR (MAMP receptors), PEPR1 (damage-associated molecular pattern (DAMP) receptor), and BRI1 (hormone receptor). Repeat conservation mapping revealed a cluster of conserved solvent-exposed residues near the C-terminus of models of the folded LRR domains. However, site-directed mutagenesis of this conserved site in FLS2 did not impair FLS2-BAK1 ECD interactions, and mutations in the analogous site of EFR caused receptor maturation defects. Hence this conserved LRR C-terminal region apparently has functions other than mediating interactions with BAK1. In vivo tests of the subsequently published FLS2-flg22-BAK1 ECD co-crystal structure were then performed to functionally evaluate some of the unexpected configurations predicted by that crystal structure. In support of the crystal structure data, FLS2-BAK1 ECD interactions were no longer detected in in vivo co-immunoprecipitation experiments after site-directed mutagenesis of the FLS2 BAK1-interaction residues S554, Q530, Q627 or N674. In contrast, in vivo FLS2-mediated signaling persisted and was only minimally reduced, suggesting residual FLS2-BAK1 interaction and the limited sensitivity of co-immunoprecipitation data relative to in vivo assays for signaling outputs. However, Arabidopsis plants expressing FLS2 with the Q530A+Q627A double mutation were impaired both in detectable interaction with BAK1 and in FLS2-mediated responses, lending overall support to current models of FLS2 structure and function.
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Affiliation(s)
- Teresa Koller
- Department of Plant Pathology, University of Wisconsin – Madison, Madison, Wisconsin, United States of America
| | - Andrew F Bent
- Department of Plant Pathology, University of Wisconsin – Madison, Madison, Wisconsin, United States of America
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31
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Hou S, Wang X, Chen D, Yang X, Wang M, Turrà D, Di Pietro A, Zhang W. The secreted peptide PIP1 amplifies immunity through receptor-like kinase 7. PLoS Pathog 2014; 10:e1004331. [PMID: 25188390 PMCID: PMC4154866 DOI: 10.1371/journal.ppat.1004331] [Citation(s) in RCA: 141] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Accepted: 07/11/2014] [Indexed: 11/18/2022] Open
Abstract
In plants, innate immune responses are initiated by plasma membrane-located pattern recognition receptors (PRRs) upon recognition of elicitors, including exogenous pathogen-associated molecular patterns (PAMPs) and endogenous damage-associated molecular patterns (DAMPs). Arabidopsis thaliana produces more than 1000 secreted peptide candidates, but it has yet to be established whether any of these act as elicitors. Here we identified an A. thaliana gene family encoding precursors of PAMP-induced secreted peptides (prePIPs) through an in-silico approach. The expression of some members of the family, including prePIP1 and prePIP2, is induced by a variety of pathogens and elicitors. Subcellular localization and proteolytic processing analyses demonstrated that the prePIP1 product is secreted into extracellular spaces where it is cleaved at the C-terminus. Overexpression of prePIP1 and prePIP2, or exogenous application of PIP1 and PIP2 synthetic peptides corresponding to the C-terminal conserved regions in prePIP1 and prePIP2, enhanced immune responses and pathogen resistance in A. thaliana. Genetic and biochemical analyses suggested that the receptor-like kinase 7 (RLK7) functions as a receptor of PIP1. Once perceived by RLK7, PIP1 initiates overlapping and distinct immune signaling responses together with the DAMP PEP1. PIP1 and PEP1 cooperate in amplifying the immune responses triggered by the PAMP flagellin. Collectively, these studies provide significant insights into immune modulation by Arabidopsis endogenous secreted peptides. Both animals and plants have evolved mechanisms to trigger innate immunity through perception of exogenous and endogenous molecules. In the model plant Arabidopsis thaliana, endogenous molecules such as the peptide elicitor PEP1 activate the immune response by means of cell surface-located receptors. Here we describe a new gene family in A. thaliana named prePIPs, whose members encode secreted peptide precursors, and show that one of its members, prePIP1, is secreted into extracellular space and cleaved at the C-terminus. Exogenous application of PIP1, the synthetic 13-amino acid peptide corresponding to the conserved C-terminal region of prePIP1, triggered immune responses and led to enhanced pathogen resistance in A. thaliana. We further provide evidence showing that PIP1 signals via the receptor-like kinase 7 (RLK7) and employs both shared and distinct components with the PEP1 signaling pathway. Both PIP1 and PEP1 cooperatively amplify the immune response triggered by flg22, the active epitope of bacterial flagellin.
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Affiliation(s)
- Shuguo Hou
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, Shandong, China
| | - Xin Wang
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, Shandong, China
| | - Donghua Chen
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, Shandong, China
| | - Xue Yang
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, Shandong, China
| | - Mei Wang
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, Shandong, China
| | - David Turrà
- Departamento de Genética, Universidad de Córdoba, Córdoba, Spain
| | | | - Wei Zhang
- Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, Shandong, China
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32
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Abstract
Despite being sessile organisms constantly exposed to potential pathogens and pests, plants are surprisingly resilient to infections. Plants can detect invaders via the recognition of pathogen-associated molecular patterns (PAMPs) by pattern recognition receptors (PRRs). Plant PRRs are surface-localized receptor-like kinases, which comprise a ligand-binding ectodomain and an intracellular kinase domain, or receptor-like proteins, which do not exhibit any known intracellular signaling domain. In this review, we summarize recent discoveries that shed light on the molecular mechanisms underlying ligand perception and subsequent activation of plant PRRs. Notably, plant PRRs appear as central components of multiprotein complexes at the plasma membrane that contain additional transmembrane and cytosolic kinases required for the initiation and specificity of immune signaling. PRR complexes are under tight control by protein phosphatases, E3 ligases, and other regulatory proteins, illustrating the exquisite and complex regulation of these molecular machines whose proper activation underlines a crucial layer of plant immunity.
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Affiliation(s)
- Alberto P Macho
- The Sainsbury Laboratory, Norwich Research Park, Norwich NR4 7UH, UK
| | - Cyril Zipfel
- The Sainsbury Laboratory, Norwich Research Park, Norwich NR4 7UH, UK.
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Mutational analysis of the Ve1 immune receptor that mediates Verticillium resistance in tomato. PLoS One 2014; 9:e99511. [PMID: 24911915 PMCID: PMC4049777 DOI: 10.1371/journal.pone.0099511] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 05/15/2014] [Indexed: 12/13/2022] Open
Abstract
Pathogenic Verticillium species are economically important plant pathogens that cause vascular wilt diseases in hundreds of plant species. The Ve1 gene of tomato confers resistance against race 1 strains of Verticillium dahliae and V. albo-atrum. Ve1 encodes an extracellular leucine-rich repeat (eLRR) receptor-like protein (RLP) that serves as a cell surface receptor for recognition of the recently identified secreted Verticillium effector Ave1. To investigate recognition of Ave1 by Ve1, alanine scanning was performed on the solvent exposed β-strand/β-turn residues across the eLRR domain of Ve1. In addition, alanine scanning was also employed to functionally characterize motifs that putatively mediate protein-protein interactions and endocytosis in the transmembrane domain and the cytoplasmic tail of the Ve1 protein. Functionality of the mutant proteins was assessed by screening for the occurrence of a hypersensitive response upon co-expression with Ave1 upon Agrobacterium tumefaciens-mediated transient expression (agroinfiltration). In order to confirm the agroinfiltration results, constructs encoding Ve1 mutants were transformed into Arabidopsis and the transgenes were challenged with race 1 Verticillium. Our analyses identified several regions of the Ve1 protein that are required for functionality.
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Lloyd SR, Schoonbeek HJ, Trick M, Zipfel C, Ridout CJ. Methods to study PAMP-triggered immunity in Brassica species. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2014; 27:286-95. [PMID: 24156768 DOI: 10.1094/mpmi-05-13-0154-fi] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The first layer of active defense in plants is based on the perception of pathogen-associated molecular patterns (PAMPs) leading to PAMP-triggered immunity (PTI). PTI is increasingly being investigated in crop plants, where it may have potential to provide durable disease resistance in the field. Limiting this work, however, is an absence of reliable bioassays to investigate PAMP responses in some species. Here, we present a series of methods to investigate PTI in Brassica napus. The assays allow measuring early responses such as the oxidative burst, mitogen-activated protein kinase phosphorylation, and PAMP-induced marker gene expression. Illumina-based RNA sequencing analysis produced a genome-wide survey of transcriptional changes upon PAMP treatment seen in both the A and C genomes of the allotetraploid B. napus. Later responses characterized include callose deposition and lignification at the cell wall, seedling growth inhibition, and PAMP-induced resistance to Pseudomonas syringae and Botrytis cinerea. Furthermore, using these assays, we demonstrated substantial variation in PAMP responses within a collection of diverse B. napus cultivars. The assays reported here could have widespread application in B. napus breeding and mapping programs to improve selection for broad-spectrum disease resistance.
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Trdá L, Fernandez O, Boutrot F, Héloir MC, Kelloniemi J, Daire X, Adrian M, Clément C, Zipfel C, Dorey S, Poinssot B. The grapevine flagellin receptor VvFLS2 differentially recognizes flagellin-derived epitopes from the endophytic growth-promoting bacterium Burkholderia phytofirmans and plant pathogenic bacteria. THE NEW PHYTOLOGIST 2014; 201:1371-1384. [PMID: 24491115 DOI: 10.1111/nph.12592] [Citation(s) in RCA: 97] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Accepted: 10/06/2013] [Indexed: 05/21/2023]
Abstract
• The role of flagellin perception in the context of plant beneficial bacteria still remains unclear. Here, we characterized the flagellin sensing system flg22-FLAGELLIN SENSING 2 (FLS2) in grapevine, and analyzed the flagellin perception in the interaction with the endophytic plant growth-promoting rhizobacterium (PGPR) Burkholderia phytofirmans. • The functionality of the grapevine FLS2 receptor, VvFLS2, was demonstrated by complementation assays in the Arabidopsis thaliana fls2 mutant, which restored flg22-induced H₂O₂ production and growth inhibition. Using synthetic flg22 peptides from different bacterial origins, we compared recognition specificities between VvFLS2 and AtFLS2. • In grapevine, flg22-triggered immune responses are conserved and led to partial resistance against Botrytis cinerea. Unlike flg22 peptides derived from Pseudomonas aeruginosa or Xanthomonas campestris, flg22 peptide derived from B. phytofirmans triggered only a small oxidative burst, weak and transient defense gene induction and no growth inhibition in grapevine. Although, in Arabidopsis, all the flg22 epitopes exhibited similar biological activities, the expression of VvFLS2 into the fls2 background conferred differential flg22 responses characteristic for grapevine. • These results demonstrate that VvFLS2 differentially recognizes flg22 from different bacteria, and suggest that flagellin from the beneficial PGPR B. phytofirmans has evolved to evade this grapevine immune recognition system.
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Affiliation(s)
- Lucie Trdá
- Université de Bourgogne, UMR 1347 Agroécologie, Pôle Interactions Plantes Micro-organismes - ERL CNRS 6300, 17 rue Sully, 21000, Dijon, France
| | - Olivier Fernandez
- Laboratoire Stress, Défenses et Reproduction des Plantes, URVVC EA 4707, Université de Reims Champagne-Ardenne, Campus Moulin de la Housse Chemin des Rouliers, 51687, Reims, France
| | - Freddy Boutrot
- The Sainsbury Laboratory, Norwich Research Park, Norwich, NR4 7UH, UK
| | - Marie-Claire Héloir
- Université de Bourgogne, UMR 1347 Agroécologie, Pôle Interactions Plantes Micro-organismes - ERL CNRS 6300, 17 rue Sully, 21000, Dijon, France
| | - Jani Kelloniemi
- Université de Bourgogne, UMR 1347 Agroécologie, Pôle Interactions Plantes Micro-organismes - ERL CNRS 6300, 17 rue Sully, 21000, Dijon, France
| | - Xavier Daire
- INRA, UMR 1347 Agroécologie, Pôle Interactions Plantes Micro-organismes - ERL CNRS 6300, 17 rue Sully, 21000, Dijon, France
| | - Marielle Adrian
- Université de Bourgogne, UMR 1347 Agroécologie, Pôle Interactions Plantes Micro-organismes - ERL CNRS 6300, 17 rue Sully, 21000, Dijon, France
| | - Christophe Clément
- Laboratoire Stress, Défenses et Reproduction des Plantes, URVVC EA 4707, Université de Reims Champagne-Ardenne, Campus Moulin de la Housse Chemin des Rouliers, 51687, Reims, France
| | - Cyril Zipfel
- The Sainsbury Laboratory, Norwich Research Park, Norwich, NR4 7UH, UK
| | - Stéphan Dorey
- Laboratoire Stress, Défenses et Reproduction des Plantes, URVVC EA 4707, Université de Reims Champagne-Ardenne, Campus Moulin de la Housse Chemin des Rouliers, 51687, Reims, France
| | - Benoit Poinssot
- Université de Bourgogne, UMR 1347 Agroécologie, Pôle Interactions Plantes Micro-organismes - ERL CNRS 6300, 17 rue Sully, 21000, Dijon, France
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36
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Fradin EF, Zhang Z, Rovenich H, Song Y, Liebrand TWH, Masini L, van den Berg GCM, Joosten MHAJ, Thomma BPHJ. Functional analysis of the tomato immune receptor Ve1 through domain swaps with its non-functional homolog Ve2. PLoS One 2014; 9:e88208. [PMID: 24505431 PMCID: PMC3914901 DOI: 10.1371/journal.pone.0088208] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Accepted: 01/08/2014] [Indexed: 02/06/2023] Open
Abstract
Resistance in tomato against race 1 strains of the fungal vascular wilt pathogens Verticillium dahliae and V. albo-atrum is mediated by the Ve locus. This locus comprises two closely linked inversely oriented genes, Ve1 and Ve2, which encode cell surface receptors of the extracellular leucine-rich repeat receptor-like protein (eLRR-RLP) type. While Ve1 mediates Verticillium resistance through monitoring the presence of the recently identified V. dahliae Ave1 effector, no functionality for Ve2 has been demonstrated in tomato. Ve1 and Ve2 contain 37 eLRRs and share 84% amino acid identity, facilitating investigation of Ve protein functionality through domain swapping. In this study it is shown that Ve chimeras in which the first thirty eLRRs of Ve1 were replaced by those of Ve2 remain able to induce HR and activate Verticillium resistance, and that deletion of these thirty eLRRs from Ve1 resulted in loss of functionality. Also the region between eLRR30 and eLRR35 is required for Ve1-mediated resistance, and cannot be replaced by the region between eLRR30 and eLRR35 of Ve2. We furthermore show that the cytoplasmic tail of Ve1 is required for functionality, as truncation of this tail results in loss of functionality. Moreover, the C-terminus of Ve2 fails to activate immune signaling as chimeras containing the C-terminus of Ve2 do not provide Verticillium resistance. Furthermore, Ve1 was found to interact through its C-terminus with the eLRR-containing receptor-like kinase (eLRR-RLK) interactor SOBIR1 that was recently identified as an interactor of eLRR-RLP (immune) receptors. Intriguingly, also Ve2 was found to interact with SOBIR1.
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Affiliation(s)
- Emilie F. Fradin
- Laboratory of Phytopathology, Wageningen University, Wageningen, The Netherlands
- Centre for BioSystems Genomics, Wageningen, The Netherlands
| | - Zhao Zhang
- Laboratory of Phytopathology, Wageningen University, Wageningen, The Netherlands
| | - Hanna Rovenich
- Laboratory of Phytopathology, Wageningen University, Wageningen, The Netherlands
| | - Yin Song
- Laboratory of Phytopathology, Wageningen University, Wageningen, The Netherlands
| | | | - Laura Masini
- Laboratory of Phytopathology, Wageningen University, Wageningen, The Netherlands
| | | | - Matthieu H. A. J. Joosten
- Laboratory of Phytopathology, Wageningen University, Wageningen, The Netherlands
- Centre for BioSystems Genomics, Wageningen, The Netherlands
| | - Bart P. H. J. Thomma
- Laboratory of Phytopathology, Wageningen University, Wageningen, The Netherlands
- Centre for BioSystems Genomics, Wageningen, The Netherlands
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37
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Tintor N, Saijo Y. ER-mediated control for abundance, quality, and signaling of transmembrane immune receptors in plants. FRONTIERS IN PLANT SCIENCE 2014; 5:65. [PMID: 24616730 PMCID: PMC3933923 DOI: 10.3389/fpls.2014.00065] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2014] [Accepted: 02/07/2014] [Indexed: 05/03/2023]
Abstract
Plants recognize a wide range of microbes with cell-surface and intracellular immune receptors. Transmembrane pattern recognition receptors (PRRs) initiate immune responses upon recognition of cognate ligands characteristic of microbes or aberrant cellular states, designated microbe-associated molecular patterns or danger-associated molecular patterns (DAMPs), respectively.Pattern-triggered immunity provides a first line of defense that restricts the invasion and propagation of both adapted and non-adapted pathogens. Receptor kinases (RKs) and receptor-like proteins (RLPs) with an extracellular leucine-rich repeat or lysine-motif (LysM) domain are extensively used as PRRs. The correct folding of the extracellular domain of these receptors is under quality control (QC) in the endoplasmic reticulum (ER), which thus provides a critical step in plant immunity. Genetic and structural insight suggests that ERQC regulates not only the abundance and quality of transmembrane receptors but also affects signal sorting between multi-branched pathways downstream of the receptor. However, ERQC dysfunction can also positively stimulate plant immunity, possibly through cell death and DAMP signaling pathways.
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Affiliation(s)
- Nico Tintor
- Department of Plant Microbe Interactions, Max Planck Institute for Plant Breeding ResearchCologne, Germany
| | - Yusuke Saijo
- Department of Plant Microbe Interactions, Max Planck Institute for Plant Breeding ResearchCologne, Germany
- Laboratory of Plant Immunity, Graduate School of Biological Sciences, Nara Institute of Science and TechnologyIkoma, Japan
- Japan Science and Technology, Precursory Research for Embryonic Science and TechnologyKawaguchi, Japan
- *Correspondence: Yusuke Saijo, Laboratory of Plant Immunity, Graduate School of Biological Sciences, Nara Institute of Science and Technology, 630-0192 Ikoma, Japan e-mail:
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38
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Smith JM, Salamango DJ, Leslie ME, Collins CA, Heese A. Sensitivity to Flg22 is modulated by ligand-induced degradation and de novo synthesis of the endogenous flagellin-receptor FLAGELLIN-SENSING2. PLANT PHYSIOLOGY 2014; 164:440-54. [PMID: 24220680 PMCID: PMC3875820 DOI: 10.1104/pp.113.229179] [Citation(s) in RCA: 104] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Accepted: 11/09/2013] [Indexed: 05/18/2023]
Abstract
FLAGELLIN-SENSING2 (FLS2) is the plant cell surface receptor that perceives bacterial flagellin or flg22 peptide, initiates flg22-signaling responses, and contributes to bacterial growth restriction. Flg22 elicitation also leads to ligand-induced endocytosis and degradation of FLS2 within 1 h. Why plant cells remove this receptor precisely at the time during which its function is required remains mainly unknown. Here, we assessed in planta flg22-signaling competency in the context of ligand-induced degradation of endogenous FLS2 and chemical interference known to impede flg22-dependent internalization of FLS2 into endocytic vesicles. Within 1 h after an initial flg22 treatment, Arabidopsis (Arabidopsis thaliana) leaf tissue was unable to reelicit flg22 signaling in a ligand-, time-, and dose-dependent manner. These results indicate that flg22-induced degradation of endogenous FLS2 may serve to desensitize cells to the same stimulus (homologous desensitization), likely to prevent continuous signal output upon repetitive flg22 stimulation. In addition to impeding ligand-induced FLS2 degradation, pretreatment with the vesicular trafficking inhibitors Wortmannin or Tyrphostin A23 impaired flg22-elicited reactive oxygen species production that was partially independent of BRASSINOSTEROID INSENSITIVE1-ASSOCIATED KINASE1. Interestingly, these inhibitors did not affect flg22-induced mitogen-activated protein kinase phosphorylation, indicating the ability to utilize vesicular trafficking inhibitors to target different flg22-signaling responses. For Tyrphostin A23, reduced flg22-induced reactive oxygen species could be separated from the defect in FLS2 degradation. At later times (>2 h) after the initial flg22 elicitation, recovery of FLS2 protein levels positively correlated with resensitization to flg22, indicating that flg22-induced new synthesis of FLS2 may prepare cells for a new round of monitoring the environment for flg22.
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39
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Zhang Z, Song Y, Liu CM, Thomma BPHJ. Mutational analysis of the Ve1 immune receptor that mediates Verticillium resistance in tomato. PLoS One 2014. [PMID: 24911915 DOI: 10.1371/journalpone.0088208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023] Open
Abstract
Pathogenic Verticillium species are economically important plant pathogens that cause vascular wilt diseases in hundreds of plant species. The Ve1 gene of tomato confers resistance against race 1 strains of Verticillium dahliae and V. albo-atrum. Ve1 encodes an extracellular leucine-rich repeat (eLRR) receptor-like protein (RLP) that serves as a cell surface receptor for recognition of the recently identified secreted Verticillium effector Ave1. To investigate recognition of Ave1 by Ve1, alanine scanning was performed on the solvent exposed β-strand/β-turn residues across the eLRR domain of Ve1. In addition, alanine scanning was also employed to functionally characterize motifs that putatively mediate protein-protein interactions and endocytosis in the transmembrane domain and the cytoplasmic tail of the Ve1 protein. Functionality of the mutant proteins was assessed by screening for the occurrence of a hypersensitive response upon co-expression with Ave1 upon Agrobacterium tumefaciens-mediated transient expression (agroinfiltration). In order to confirm the agroinfiltration results, constructs encoding Ve1 mutants were transformed into Arabidopsis and the transgenes were challenged with race 1 Verticillium. Our analyses identified several regions of the Ve1 protein that are required for functionality.
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Affiliation(s)
- Zhao Zhang
- Laboratory of Phytopathology, Wageningen University, Wageningen, The Netherlands; Key Laboratory of Plant Molecular Physiology, the Chinese Academy of Sciences, Beijing, China
| | - Yin Song
- Laboratory of Phytopathology, Wageningen University, Wageningen, The Netherlands
| | - Chun-Ming Liu
- Key Laboratory of Plant Molecular Physiology, the Chinese Academy of Sciences, Beijing, China
| | - Bart P H J Thomma
- Laboratory of Phytopathology, Wageningen University, Wageningen, The Netherlands
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40
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Zhang Z, Thomma BPHJ. Structure-function aspects of extracellular leucine-rich repeat-containing cell surface receptors in plants. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2013; 55:1212-23. [PMID: 23718712 DOI: 10.1111/jipb.12080] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2013] [Accepted: 05/23/2013] [Indexed: 05/08/2023]
Abstract
Plants exploit several types of cell surface receptors for perception of extracellular signals, of which the extracellular leucine-rich repeat (eLRR)-containing receptors form the major class. Although the function of most plant eLRR receptors remains unclear, an increasing number of these receptors are shown to play roles in innate immunity and a wide variety of developmental processes. Recent efforts using domain swaps, gene shuffling analyses, site-directed mutagenesis, interaction studies, and crystallographic analyses resulted in the current knowledge on ligand binding and the mechanism of activation of plant eLRR receptors. This review provides an overview of eLRR receptor research, specifically summarizing the recent understanding of interactions among plant eLRR receptors, their co-receptors and corresponding ligands. The functions of distinct eLRR receptor domains, and their role in structure, ligand perception and multimeric complex formation are discussed. [Figure: see text] Bart P.H.J. Thomma (Corresponding author).
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Affiliation(s)
- Zhao Zhang
- Laboratory of Phytopathology, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
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41
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Clarke CR, Chinchilla D, Hind SR, Taguchi F, Miki R, Ichinose Y, Martin GB, Leman S, Felix G, Vinatzer BA. Allelic variation in two distinct Pseudomonas syringae flagellin epitopes modulates the strength of plant immune responses but not bacterial motility. THE NEW PHYTOLOGIST 2013; 200:847-860. [PMID: 23865782 PMCID: PMC3797164 DOI: 10.1111/nph.12408] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2013] [Accepted: 06/07/2013] [Indexed: 05/18/2023]
Abstract
The bacterial flagellin (FliC) epitopes flg22 and flgII-28 are microbe-associated molecular patterns (MAMPs). Although flg22 is recognized by many plant species via the pattern recognition receptor FLS2, neither the flgII-28 receptor nor the extent of flgII-28 recognition by different plant families is known. Here, we tested the significance of flgII-28 as a MAMP and the importance of allelic diversity in flg22 and flgII-28 in plant-pathogen interactions using purified peptides and a Pseudomonas syringae ∆fliC mutant complemented with different fliC alleles. The plant genotype and allelic diversity in flg22 and flgII-28 were found to significantly affect the plant immune response, but not bacterial motility. The recognition of flgII-28 is restricted to a number of solanaceous species. Although the flgII-28 peptide does not trigger any immune response in Arabidopsis, mutations in both flg22 and flgII-28 have FLS2-dependent effects on virulence. However, the expression of a tomato allele of FLS2 does not confer to Nicotiana benthamiana the ability to detect flgII-28, and tomato plants silenced for FLS2 are not altered in flgII-28 recognition. Therefore, MAMP diversification is an effective pathogen virulence strategy, and flgII-28 appears to be perceived by an as yet unidentified receptor in the Solanaceae, although it has an FLS2-dependent virulence effect in Arabidopsis.
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Affiliation(s)
- Christopher R. Clarke
- Department of Plant Pathology, Physiology and Weed Sciences Latham Hall, Ag Quad Lane, Virginia Tech, Blacksburg, VA 24061, USA
| | - Delphine Chinchilla
- Zurich-Basel Plant Science Center, Department of Environmental Sciences, University of Basel, Hebelstrasse 1, 4056 Basel, Switzerland
| | - Sarah R. Hind
- Boyce Thompson Institute for Plant Research, Ithaca, NY 14853, USA
| | - Fumiko Taguchi
- Graduate School of Natural Science and Technology, Okayama University, Tsushima-naka 1-1-1, Okayama 700-8530, Japan
| | - Ryuji Miki
- Graduate School of Natural Science and Technology, Okayama University, Tsushima-naka 1-1-1, Okayama 700-8530, Japan
| | - Yuki Ichinose
- Graduate School of Natural Science and Technology, Okayama University, Tsushima-naka 1-1-1, Okayama 700-8530, Japan
| | - Gregory B. Martin
- Boyce Thompson Institute for Plant Research, Ithaca, NY 14853, USA
- Department of Plant Pathology and Plant-Microbe Biology, Cornell University, Ithaca, NY 14853, USA; and Genomics and Biotechnology Section, Department of Biological Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Scotland Leman
- Department of Statistics, Virginia Tech, Blacksburg, VA 24061, USA
| | - Georg Felix
- Zentrum für Molekularbiologie der Pflanzen, University Tübingen, 72076, Germany
| | - Boris A. Vinatzer
- Department of Plant Pathology, Physiology and Weed Sciences Latham Hall, Ag Quad Lane, Virginia Tech, Blacksburg, VA 24061, USA
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42
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Sun Y, Li L, Macho AP, Han Z, Hu Z, Zipfel C, Zhou JM, Chai J. Structural basis for flg22-induced activation of the Arabidopsis FLS2-BAK1 immune complex. Science 2013; 342:624-8. [PMID: 24114786 DOI: 10.1126/science.1243825] [Citation(s) in RCA: 453] [Impact Index Per Article: 41.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Flagellin perception in Arabidopsis is through recognition of its highly conserved N-terminal epitope (flg22) by flagellin-sensitive 2 (FLS2). Flg22 binding induces FLS2 heteromerization with BRASSINOSTEROID INSENSITIVE 1-associated kinase 1 (BAK1) and their reciprocal activation followed by plant immunity. Here, we report the crystal structure of FLS2 and BAK1 ectodomains complexed with flg22 at 3.06 angstroms. A conserved and a nonconserved site from the inner surface of the FLS2 solenoid recognize the C- and N-terminal segment of flg22, respectively, without oligomerization or conformational changes in the FLS2 ectodomain. Besides directly interacting with FLS2, BAK1 acts as a co-receptor by recognizing the C terminus of the FLS2-bound flg22. Our data reveal the molecular mechanisms underlying FLS2-BAK1 complex recognition of flg22 and provide insight into the immune receptor complex activation.
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Affiliation(s)
- Yadong Sun
- School of Life Sciences, Tsinghua University, Beijing 100084, China, and Tsinghua-Peking Center for Life Sciences, Beijing 100084, China
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43
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Wang N, Trivedi P. Citrus huanglongbing: a newly relevant disease presents unprecedented challenges. PHYTOPATHOLOGY 2013; 103:652-65. [PMID: 23441969 DOI: 10.1094/phyto-12-12-0331-rvw] [Citation(s) in RCA: 176] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Citrus huanglongbing (HLB) is one of the oldest citrus diseases and has been known for over a century. HLB is caused by 'Candidatus Liberibacter' spp. that are phloem-limited, fastidious α-proteobacteria and infect hosts in different Kingdoms (i.e., Animalia and Plantae). When compared with well-characterized, cultivatable plant-pathogenic Gram-negative bacteria, the interactions of uncultured insect-vectored plant-pathogenic bacteria, including 'Ca. Liberibacter' spp., with their hosts remain poorly understood. 'Ca. Liberibacter' spp. have been known to cause HLB, which has been rapidly spreading worldwide, resulting in dramatic economic losses. HLB presents an unprecedented challenge to citrus production. In this review, we focus on the most recent research on citrus, 'Candidatus Liberibacter asiaticus', and psyllid interactions, specifically considering the following topics: evolutionary relationships among 'Ca. Liberibacter' spp., genetic diversity, host range, genome analysis, transmission, virulence mechanisms, and the ecological importance of HLB. Currently, no efficient management strategy is available to control HLB, although some promising progress has been made. Further studies are needed to understand citrus, 'Ca. L. asiaticus', and psyllid interactions to design innovative management strategies. Although HLB has been problematic for over a century, we can only win the battle against HLB with a coordinated and deliberate effort by the citrus industry, citrus growers, researchers, legislatures, and governments.
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Affiliation(s)
- Nian Wang
- Cirtrus Research Education Center, Department of Microbiology and Cell Science, University of Florida, Lake Alfred 33850, USA.
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Robatzek S, Wirthmueller L. Mapping FLS2 function to structure: LRRs, kinase and its working bits. PROTOPLASMA 2013; 250:671-81. [PMID: 23053766 DOI: 10.1007/s00709-012-0459-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2012] [Accepted: 09/21/2012] [Indexed: 05/26/2023]
Abstract
The plasma membrane-localised FLAGELLIN SENSING 2 (FLS2) receptor is an important component of plant immunity against potentially pathogenic bacteria, acting to recognise the conserved flg22 peptide of flagellin. FLS2 shares the common structure of transmembrane receptor kinases with a receptor-like ectodomain composed of leucine-rich repeats (LRR) and an active intracellular kinase domain. Upon ligand binding, FLS2 dimerises with the regulatory LRR-receptor kinase BRI1-associated kinase 1, which in turn triggers downstream signalling cascades. Although lacking crystal structure data, recent advances have been made in our understanding of flg22 recognition based on structural and functional analyses of FLS2. These studies have revealed critical regions/residues of FLS2 and post-translational modifications that regulate the abundance and activity of this receptor. In this review, we present the current knowledge on the structural mechanism of the FLS2-flg22 interaction and subsequent receptor-mediated signalling.
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Affiliation(s)
- Silke Robatzek
- The Sainsbury Laboratory, Norwich Research Park, Norwich, NR4 7UH, UK.
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Mutations in FLS2 Ser-938 dissect signaling activation in FLS2-mediated Arabidopsis immunity. PLoS Pathog 2013; 9:e1003313. [PMID: 23637603 PMCID: PMC3630090 DOI: 10.1371/journal.ppat.1003313] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2012] [Accepted: 03/04/2013] [Indexed: 11/19/2022] Open
Abstract
Flagellin-sensing 2 (FLS2) is a leucine-rich repeat/transmembrane domain/protein kinase (LRR-RLK) that is the plant receptor for bacterial flagellin or the flagellin-derived flg22 peptide. Previous work has shown that after flg22 binding, FLS2 releases BIK1 kinase and homologs and associates with BAK1 kinase, and that FLS2 kinase activity is critical for FLS2 function. However, the detailed mechanisms for activation of FLS2 signaling remain unclear. The present study initially identified multiple FLS2 in vitro phosphorylation sites and found that Serine-938 is important for FLS2 function in vivo. FLS2-mediated immune responses are abolished in transgenic plants expressing FLS2(S938A), while the acidic phosphomimic mutants FLS2(S938D) and FLS2(S938E) conferred responses similar to wild-type FLS2. FLS2-BAK1 association and FLS2-BIK1 disassociation after flg22 exposure still occur with FLS2(S938A), demonstrating that flg22-induced BIK1 release and BAK1 binding are not sufficient for FLS2 activity, and that Ser-938 controls other aspects of FLS2 activity. Purified BIK1 still phosphorylated purified FLS2(S938A) and FLS2(S938D) mutant kinase domains in vitro. Phosphorylation of BIK1 and homologs after flg22 exposure was disrupted in transgenic Arabidopsis thaliana plants expressing FLS2(S938A) or FLS2(D997A) (a kinase catalytic site mutant), but was normally induced in FLS2(S938D) plants. BIK1 association with FLS2 required a kinase-active FLS2, but FLS2-BAK1 association did not. Hence FLS2-BIK1 dissociation and FLS2-BAK1 association are not sufficient for FLS2-mediated defense activation, but the proposed FLS2 phosphorylation site Ser-938 and FLS2 kinase activity are needed both for overall defense activation and for appropriate flg22-stimulated phosphorylation of BIK1 and homologs.
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Ngo QA, Albrecht H, Tsuchimatsu T, Grossniklaus U. The differentially regulated genes TvQR1 and TvPirin of the parasitic plant Triphysaria exhibit distinctive natural allelic diversity. BMC PLANT BIOLOGY 2013; 13:28. [PMID: 23419068 PMCID: PMC3599707 DOI: 10.1186/1471-2229-13-28] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Accepted: 02/11/2013] [Indexed: 05/22/2023]
Abstract
BACKGROUND Plant parasitism represents an extraordinary interaction among flowering plants: parasitic plants use a specialized organ, the haustorium, to invade the host vascular system to deprive host plants of water and nutrients. Various compounds present in exudates of host plants trigger haustorium development. The two most effective haustorium inducing factors (HIFs) known for the parasitic plant Triphysaria versicolor (T. versicolor) are peonidin, an antioxidant flavonoid, and 2,6-dimethoxybenzoquinone (DMBQ), an oxidative stress agent. To date, two genes involved in haustorium initiation in T. versicolor have been identified: TvQR1, a quinone oxidoreductase that generates the active HIF from DMBQ, and TvPirin, a transcription co-factor that regulates several other DMBQ- responsive and -non-responsive genes. While the expression of these genes in response to DMBQ is well characterized, their expression in response to peonidin is not. In addition, the pattern of polymorphisms in these genes is unknown, even though nucleotide changes in TvQR1 and TvPirin may have contributed to the ability of T. versicolor to develop haustoria. To gain insights into these aspects, we investigated their transcriptional responses to HIFs and non-HIF and their natural nucleotide diversity. RESULTS Here we show that TvQR1 and TvPirin are transcriptionally upregulated by both DMBQ and peonidin in T. versicolor roots. Yet, while TvQR1 also responded to juglone, a non-HIF quinone with toxicity comparable to that of DMBQ, TvPirin did not. We further demonstrate that TvPirin encodes a protein shorter than the one previously reported. In the T. versicolor natural population of Northern California, TvQR1 exhibited remarkably higher molecular diversity and more recombination events than TvPirin, with the highest non-synonymous substitution rate in the substrate recognition and catalytic domain of the TvQR1 protein. CONCLUSION Our results suggest that TvQR1 and TvPirin have most likely evolved highly distinct roles for haustorium formation. Unlike TvPirin, TvQR1 might have been under diversifying selection to maintain a diverse collection of polymorphisms, which might be related to the recognition of an assortment of HIF and non-HIF quinones as substrates for successful haustorial establishment in a wide range of host plants.
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Affiliation(s)
- Quy A Ngo
- Genetics Graduate Group, University of California – Davis, One Shields Avenue, Davis, CA 95616, USA
- Institute of Plant Biology & Zürich-Basel Plant Science Center, University of Zürich, Zollikerstrasse 107, CH-8008, Zürich, Switzerland
| | - Huguette Albrecht
- Department of Public Health Sciences, School of Medicine, University of California – Davis, One Shields Avenue, Davis, CA 95616, USA
| | - Takashi Tsuchimatsu
- Gregor Mendel Institute, Austrian Academy of Sciences, Dr. Bohr-Gasse 3, 1030, Vienna, Austria
| | - Ueli Grossniklaus
- Institute of Plant Biology & Zürich-Basel Plant Science Center, University of Zürich, Zollikerstrasse 107, CH-8008, Zürich, Switzerland
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Matvienko M, Kozik A, Froenicke L, Lavelle D, Martineau B, Perroud B, Michelmore R. Consequences of normalizing transcriptomic and genomic libraries of plant genomes using a duplex-specific nuclease and tetramethylammonium chloride. PLoS One 2013; 8:e55913. [PMID: 23409088 PMCID: PMC3568094 DOI: 10.1371/journal.pone.0055913] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Accepted: 01/04/2013] [Indexed: 12/22/2022] Open
Abstract
Several applications of high throughput genome and transcriptome sequencing would benefit from a reduction of the high-copy-number sequences in the libraries being sequenced and analyzed, particularly when applied to species with large genomes. We adapted and analyzed the consequences of a method that utilizes a thermostable duplex-specific nuclease for reducing the high-copy components in transcriptomic and genomic libraries prior to sequencing. This reduces the time, cost, and computational effort of obtaining informative transcriptomic and genomic sequence data for both fully sequenced and non-sequenced genomes. It also reduces contamination from organellar DNA in preparations of nuclear DNA. Hybridization in the presence of 3 M tetramethylammonium chloride (TMAC), which equalizes the rates of hybridization of GC and AT nucleotide pairs, reduced the bias against sequences with high GC content. Consequences of this method on the reduction of high-copy and enrichment of low-copy sequences are reported for Arabidopsis and lettuce.
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Affiliation(s)
- Marta Matvienko
- Genome Center, University of California Davis, Davis, California, United States of America
| | - Alexander Kozik
- Genome Center, University of California Davis, Davis, California, United States of America
| | - Lutz Froenicke
- Genome Center, University of California Davis, Davis, California, United States of America
| | - Dean Lavelle
- Genome Center, University of California Davis, Davis, California, United States of America
| | - Belinda Martineau
- Genome Center, University of California Davis, Davis, California, United States of America
| | - Bertrand Perroud
- Genome Center, University of California Davis, Davis, California, United States of America
| | - Richard Michelmore
- Genome Center, University of California Davis, Davis, California, United States of America
- Departments of Plant Sciences, Molecular and Cellular Biology, and Medical Microbiology and Immunology, University of California Davis, Davis, California, United States of America
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The Genetic and Molecular Basis of Plant Resistance to Pathogens. J Genet Genomics 2013; 40:23-35. [DOI: 10.1016/j.jgg.2012.11.003] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Revised: 11/29/2012] [Accepted: 12/03/2012] [Indexed: 10/27/2022]
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Law YS, Gudimella R, Song BK, Ratnam W, Harikrishna JA. Molecular characterization and comparative sequence analysis of defense-related gene, Oryza rufipogon receptor-like protein kinase 1. Int J Mol Sci 2012; 13:9343-9362. [PMID: 22942769 PMCID: PMC3430300 DOI: 10.3390/ijms13079343] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Revised: 07/06/2012] [Accepted: 07/06/2012] [Indexed: 11/16/2022] Open
Abstract
Many of the plant leucine rich repeat receptor-like kinases (LRR-RLKs) have been found to regulate signaling during plant defense processes. In this study, we selected and sequenced an LRR-RLK gene, designated as Oryza rufipogon receptor-like protein kinase 1 (OrufRPK1), located within yield QTL yld1.1 from the wild rice Oryza rufipogon (accession IRGC105491). A 2055 bp coding region and two exons were identified. Southern blotting determined OrufRPK1 to be a single copy gene. Sequence comparison with cultivated rice orthologs (OsI219RPK1, OsI9311RPK1 and OsJNipponRPK1, respectively derived from O. sativa ssp. indica cv. MR219, O. sativa ssp. indica cv. 9311 and O. sativa ssp. japonica cv. Nipponbare) revealed the presence of 12 single nucleotide polymorphisms (SNPs) with five non-synonymous substitutions, and 23 insertion/deletion sites. The biological role of the OrufRPK1 as a defense related LRR-RLK is proposed on the basis of cDNA sequence characterization, domain subfamily classification, structural prediction of extra cellular domains, cluster analysis and comparative gene expression.
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Affiliation(s)
- Yee-Song Law
- Centre for Research in Biotechnology for Agriculture (CEBAR) and Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, 50603, Malaysia; E-Mails: (Y.-S.L.); (R.G.)
| | - Ranganath Gudimella
- Centre for Research in Biotechnology for Agriculture (CEBAR) and Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, 50603, Malaysia; E-Mails: (Y.-S.L.); (R.G.)
| | - Beng-Kah Song
- School of Science, Monash University Sunway Campus, Jalan Lagoon Selatan, Bandar Sunway, Selangor 46150, Malaysia; E-Mail:
| | - Wickneswari Ratnam
- School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia; E-Mail:
| | - Jennifer Ann Harikrishna
- Centre for Research in Biotechnology for Agriculture (CEBAR) and Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, 50603, Malaysia; E-Mails: (Y.-S.L.); (R.G.)
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Mueller K, Bittel P, Chinchilla D, Jehle AK, Albert M, Boller T, Felix G. Chimeric FLS2 receptors reveal the basis for differential flagellin perception in Arabidopsis and tomato. THE PLANT CELL 2012; 24:2213-24. [PMID: 22634763 PMCID: PMC3442597 DOI: 10.1105/tpc.112.096073] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2012] [Revised: 03/15/2012] [Accepted: 05/02/2012] [Indexed: 05/18/2023]
Abstract
The flagellin receptor of Arabidopsis thaliana, At-FLAGELLIN SENSING2 (FLS2), has become a model for mechanistic and functional studies on plant immune receptors. Here, we started out with a comparison of At-FLS2 and the orthologous tomato (Solanum lycopersicum) receptor Sl-FLS2. Both receptors specifically responded to picomolar concentrations of the genuine flg22 ligand but proved insensitive to >10(6)-fold higher concentrations of CLV3 peptides that have recently been reported as a second type of ligand for At-FLS2. At-FLS2 and Sl-FLS2 exhibit species-specific differences in the recognition of shortened or sequence-modified flg22 ligands. To map the sites responsible for these species-specific traits on the FLS2 receptors, we performed domain swaps, substituting subsets of the 28 leucine-rich repeats (LRRs) in At-FLS2 with the corresponding LRRs from Sl-FLS2. We found that the LRRs 7 to 10 of Sl-FLS2 determine the high affinity of Sl-FLS2 for the core part RINSAKDD of flg22. In addition, we discovered importance of the LRRs 19 to 24 for the responsiveness to C-terminally modified flagellin peptides. These results indicate that ligand perception in FLS2 is a complex molecular process that involves LRRs from both the outermost and innermost LRRs of the FLS2 ectodomain.
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Affiliation(s)
- Katharina Mueller
- Zentrum für Molekularbiologie der Pflanzen, University Tübingen, 72076 Tuebingen, Germany
| | - Pascal Bittel
- Zurich-Basel Plant Science Center, Botanisches Institut, Universität Basel, 4056 Basel, Switzerland
| | - Delphine Chinchilla
- Zurich-Basel Plant Science Center, Botanisches Institut, Universität Basel, 4056 Basel, Switzerland
| | - Anna K. Jehle
- Zentrum für Molekularbiologie der Pflanzen, University Tübingen, 72076 Tuebingen, Germany
| | - Markus Albert
- Zentrum für Molekularbiologie der Pflanzen, University Tübingen, 72076 Tuebingen, Germany
| | - Thomas Boller
- Zurich-Basel Plant Science Center, Botanisches Institut, Universität Basel, 4056 Basel, Switzerland
| | - Georg Felix
- Zentrum für Molekularbiologie der Pflanzen, University Tübingen, 72076 Tuebingen, Germany
- Address correspondence to
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