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Lee DH, Lee HS, Belkhadir Y. Coding of plant immune signals by surface receptors. CURRENT OPINION IN PLANT BIOLOGY 2021; 62:102044. [PMID: 33979769 DOI: 10.1016/j.pbi.2021.102044] [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: 01/14/2021] [Revised: 03/11/2021] [Accepted: 03/16/2021] [Indexed: 06/12/2023]
Abstract
The detection of molecular signals derived from other organisms is central to the evolutionary success of plants in the colonization of Earth. The sensory coding of these signals is critical for marshaling local and systemic immune responses that keep most invading organisms at bay. Plants detect immune signals inside and outside their cells using receptors. Here, we focus on receptors that function at the cell surface. We present recent work that expands our understanding of the repertoire of immune signals sensed by this family of receptors.
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Affiliation(s)
- Du-Hwa Lee
- Gregor Mendel Institute (GMI), Austrian Academy of Sciences, Vienna BioCenter (VBC), Dr. Bohr-Gasse 3, Vienna, Austria
| | - Ho-Seok Lee
- Gregor Mendel Institute (GMI), Austrian Academy of Sciences, Vienna BioCenter (VBC), Dr. Bohr-Gasse 3, Vienna, Austria
| | - Youssef Belkhadir
- Gregor Mendel Institute (GMI), Austrian Academy of Sciences, Vienna BioCenter (VBC), Dr. Bohr-Gasse 3, Vienna, Austria.
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52
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Genome editing for resistance against plant pests and pathogens. Transgenic Res 2021; 30:427-459. [PMID: 34143358 DOI: 10.1007/s11248-021-00262-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Accepted: 05/27/2021] [Indexed: 12/12/2022]
Abstract
The conventional breeding of crops struggles to keep up with increasing food needs and ever-adapting pests and pathogens. Global climate changes have imposed another layer of complexity to biological systems, increasing the challenge to obtain improved crop cultivars. These dictate the development and application of novel technologies, like genome editing (GE), that assist targeted and fast breeding programs in crops, with enhanced resistance to pests and pathogens. GE does not require crossings, hence avoiding the introduction of undesirable traits through linkage in elite varieties, speeding up the whole breeding process. Additionally, GE technologies can improve plant protection by directly targeting plant susceptibility (S) genes or virulence factors of pests and pathogens, either through the direct edition of the pest genome or by adding the GE machinery to the plant genome or to microorganisms functioning as biocontrol agents (BCAs). Over the years, GE technology has been continuously evolving and more so with the development of CRISPR/Cas. Here we review the latest advancements of GE to improve plant protection, focusing on CRISPR/Cas-based genome edition of crops and pests and pathogens. We discuss how other technologies, such as host-induced gene silencing (HIGS) and the use of BCAs could benefit from CRISPR/Cas to accelerate the development of green strategies to promote a sustainable agriculture in the future.
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53
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Kharel A, Islam MT, Rookes J, Cahill D. How to Unravel the Key Functions of Cryptic Oomycete Elicitin Proteins and Their Role in Plant Disease. PLANTS 2021; 10:plants10061201. [PMID: 34204633 PMCID: PMC8231210 DOI: 10.3390/plants10061201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 06/08/2021] [Accepted: 06/09/2021] [Indexed: 12/13/2022]
Abstract
Pathogens and plants are in a constant battle with one another, the result of which is either the restriction of pathogen growth via constitutive or induced plant defense responses or the pathogen colonization of plant cells and tissues that cause disease. Elicitins are a group of highly conserved proteins produced by certain oomycete species, and their sterol binding ability is recognized as an important feature in sterol–auxotrophic oomycetes. Elicitins also orchestrate other aspects of the interactions of oomycetes with their plant hosts. The function of elicitins as avirulence or virulence factors is controversial and is dependent on the host species, and despite several decades of research, the function of these proteins remains elusive. We summarize here our current understanding of elicitins as either defense-promoting or defense-suppressing agents and propose that more recent approaches such as the use of ‘omics’ and gene editing can be used to unravel the role of elicitins in host–pathogen interactions. A better understanding of the role of elicitins is required and deciphering their role in host–pathogen interactions will expand the strategies that can be adopted to improve disease resistance and reduce crop losses.
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54
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Affiliation(s)
- Weizhen Wang
- Department of Plant Pathology, College of Plant Protection, China Agricultural University, Beijing, China
- Laboratory of Phytopathology, Wageningen University & Research, Wageningen, the Netherlands
| | - Xili Liu
- Department of Plant Pathology, College of Plant Protection, China Agricultural University, Beijing, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, China
| | - Francine Govers
- Laboratory of Phytopathology, Wageningen University & Research, Wageningen, the Netherlands
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55
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Yu TY, Sun MK, Liang LK. Receptors in the Induction of the Plant Innate Immunity. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2021; 34:587-601. [PMID: 33512246 DOI: 10.1094/mpmi-07-20-0173-cr] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Plants adjust amplitude and duration of immune responses via different strategies to maintain growth, development, and resistance to pathogens. Pathogen-associated molecular pattern (PAMP)-triggered immunity (PTI) and effector-triggered immunity (ETI) play vital roles. Pattern recognition receptors, comprising a large number of receptor-like protein kinases and receptor-like proteins, recognize related ligands and trigger immunity. PTI is the first layer of the innate immune system, and it recognizes PAMPs at the plasma membrane to prevent infection. However, pathogens exploit effector proteins to bypass or directly inhibit the PTI immune pathway. Consistently, plants have evolved intracellular nucleotide-binding domain and leucine-rich repeat-containing proteins to detect pathogenic effectors and trigger a hypersensitive response to activate ETI. PTI and ETI work together to protect plants from infection by viruses and other pathogens. Diverse receptors and the corresponding ligands, especially several pairs of well-studied receptors and ligands in PTI immunity, are reviewed to illustrate the dynamic process of PTI response here.[Formula: see text] Copyright © 2021 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
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Affiliation(s)
- Tian-Ying Yu
- College of Life Sciences, Yantai University, Yantai 264005, China
| | - Meng-Kun Sun
- College of Life Sciences, Yantai University, Yantai 264005, China
| | - Li-Kun Liang
- College of Life Sciences, Yantai University, Yantai 264005, China
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56
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Ah‐Fong AM, Boyd AM, Matson ME, Judelson HS. A Cas12a-based gene editing system for Phytophthora infestans reveals monoallelic expression of an elicitor. MOLECULAR PLANT PATHOLOGY 2021; 22:737-752. [PMID: 33724663 PMCID: PMC8126191 DOI: 10.1111/mpp.13051] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 01/28/2021] [Accepted: 02/16/2021] [Indexed: 05/03/2023]
Abstract
Phytophthora infestans is a destructive pathogen of potato and a model for investigations of oomycete biology. The successful application of a CRISPR gene editing system to P. infestans is so far unreported. We discovered that it is difficult to express CRISPR/Cas9 but not a catalytically inactive form in transformants, suggesting that the active nuclease is toxic. We were able to achieve editing with CRISPR/Cas12a using vectors in which the nuclease and its guide RNA were expressed from a single transcript. Using the elicitor gene Inf1 as a target, we observed editing of one or both alleles in up to 13% of transformants. Editing was more efficient when guide RNA processing relied on the Cas12a direct repeat instead of ribozyme sequences. INF1 protein was not made when both alleles were edited in the same transformant, but surprisingly also when only one allele was altered. We discovered that the isolate used for editing, 1306, exhibited monoallelic expression of Inf1 due to insertion of a copia-like element in the promoter of one allele. The element exhibits features of active retrotransposons, including a target site duplication, long terminal repeats, and an intact polyprotein reading frame. Editing occurred more often on the transcribed allele, presumably due to differences in chromatin structure. The Cas12a system not only provides a tool for modifying genes in P. infestans, but also for other members of the genus by expanding the number of editable sites. Our work also highlights a natural mechanism that remodels oomycete genomes.
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Affiliation(s)
- Audrey M.V. Ah‐Fong
- Department of Microbiology and Plant PathologyUniversity of CaliforniaRiversideCaliforniaUSA
| | - Amy M. Boyd
- Department of Microbiology and Plant PathologyUniversity of CaliforniaRiversideCaliforniaUSA
| | - Michael E.H. Matson
- Department of Microbiology and Plant PathologyUniversity of CaliforniaRiversideCaliforniaUSA
| | - Howard S. Judelson
- Department of Microbiology and Plant PathologyUniversity of CaliforniaRiversideCaliforniaUSA
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57
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Frailie TB, Innes RW. Engineering healthy crops: molecular strategies for enhancing the plant immune system. Curr Opin Biotechnol 2021; 70:151-157. [PMID: 34030033 DOI: 10.1016/j.copbio.2021.04.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 04/21/2021] [Accepted: 04/26/2021] [Indexed: 11/19/2022]
Abstract
Crop diseases caused by viruses, bacteria, fungi, oomycetes and nematodes constitute major costs for farmers in terms of control measures and yield losses. Enhancing resistance to these pathogens via genetic modification or genome editing represents an economically and environmentally attractive path forward. Recent advances in our understanding of how plants detect pathogens and activate immune responses is now enabling enhancement of disease resistance traits. In particular, the recent determination of structures of both cell surface and intracellular immune receptors in plants in their activated states is providing new insights into how recognition complexes can be modified to expand recognition specificities to confer resistance to otherwise virulent pathogens. By expanding the repertoire of both cell surface and intracellular recognition systems, and combining them, it is expected that resistance to numerous diseases will be enhanced and will be more durable.
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Affiliation(s)
- Tyler B Frailie
- Department of Biology, Indiana University, Bloomington, IN 47405, USA
| | - Roger W Innes
- Department of Biology, Indiana University, Bloomington, IN 47405, USA.
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58
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Kang WH, Park B, Lee J, Yeom SI. Tissue-Specific RNA-Seq Analysis and Identification of Receptor-Like Proteins Related to Plant Growth in Capsicum annuum. PLANTS (BASEL, SWITZERLAND) 2021; 10:972. [PMID: 34068172 PMCID: PMC8152994 DOI: 10.3390/plants10050972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 05/03/2021] [Accepted: 05/12/2021] [Indexed: 11/26/2022]
Abstract
Receptor-like proteins (RLPs) are a gene family of cell surface receptors that are involved in plant growth, development, and disease resistance. In a recent study, 438 pepper RLP genes were identified in the Capsicum annuum genome (CaRLPs) and determined to be present in response to multiple biotic stresses. To further understand the role of CaRLPs in plant growth and development, we analyzed expression patterns of all CaRLPs from various pepper tissues and developmental stages using RNA-seq. Ten CaRLP genes were selected for further analysis according to transcript levels with hierarchical clustering. The selected CaRLP genes displayed similarity of motifs within the same groups and structures typical of RLPs. To examine RLP function in growth and development, we performed loss-of-function analysis using a virus-induced gene silencing system. Three of the ten tested CaRLPs (CaRLP238, 253, and 360) in silenced plants exhibited phenotypic alteration with growth retardation compared to controls. All three gene-silenced peppers showed significant differences in root dry weight. Only CaRLP238 had significant differences in both root and shoot dry weight. Our results suggest that CaRLPs may play important roles in regulation of plant growth and development as well as function in defense responses to biotic stresses in the RLP gene family.
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Affiliation(s)
- Won-Hee Kang
- Institute of Agriculture & Life Science, Gyeongsang National University, Jinju 52828, Korea;
| | - Boseul Park
- Department of Horticulture, Division of Applied Life Science (BK21 Four), Gyeongsang National University, Jinju 52828, Korea; (B.P.); (J.L.)
| | - Junesung Lee
- Department of Horticulture, Division of Applied Life Science (BK21 Four), Gyeongsang National University, Jinju 52828, Korea; (B.P.); (J.L.)
| | - Seon-In Yeom
- Institute of Agriculture & Life Science, Gyeongsang National University, Jinju 52828, Korea;
- Department of Horticulture, Division of Applied Life Science (BK21 Four), Gyeongsang National University, Jinju 52828, Korea; (B.P.); (J.L.)
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59
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Zhang L, Yan J, Fu Z, Shi W, Ninkuu V, Li G, Yang X, Zeng H. FoEG1, a secreted glycoside hydrolase family 12 protein from Fusarium oxysporum, triggers cell death and modulates plant immunity. MOLECULAR PLANT PATHOLOGY 2021; 22:522-538. [PMID: 33675158 PMCID: PMC8035634 DOI: 10.1111/mpp.13041] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 01/29/2021] [Accepted: 01/29/2021] [Indexed: 05/19/2023]
Abstract
Fusarium oxysporum is an important soilborne fungal pathogen with many different formae speciales that can colonize the plant vascular system and cause serious crop wilt disease worldwide. We found a glycoside hydrolase family 12 protein FoEG1, secreted by F. oxysporum, that acted as a pathogen-associated molecular pattern (PAMP) targeting the apoplast of plants to induce cell death. Purified FoEG1 protein triggered cell death in different plants and induced the plant defence response to enhance the disease resistance of plants. The ability of FoEG1 to induce cell death was mediated by leucine-rich repeat (LRR) receptor-like kinases BAK1 and SOBIR1, and this ability was independent of its hydrolase activity. The mutants of cysteine residues did not affect the ability of FoEG1 to induce cell death, and an 86 amino acid fragment from amino acid positions 144 to 229 of FoEG1 was sufficient to induce cell death in Nicotiana benthamiana. In addition, the expression of FoEG1 was strongly induced in the early stage of F. oxysporum infection of host plants, and FoEG1 deletion or loss of enzyme activity reduced the virulence of F. oxysporum. Therefore, our results suggest that FoEG1 can contribute to the virulence of F. oxysporum depending on its enzyme activity and can also act as a PAMP to induce plant defence responses.
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Affiliation(s)
- Lin Zhang
- State Key Laboratory for Biology of Plant Diseases and Insect PestsInstitute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina
| | - Jianpei Yan
- State Key Laboratory for Biology of Plant Diseases and Insect PestsInstitute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina
| | - Zhenchao Fu
- State Key Laboratory for Biology of Plant Diseases and Insect PestsInstitute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina
| | - Wenjiong Shi
- State Key Laboratory for Biology of Plant Diseases and Insect PestsInstitute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina
| | - Vincent Ninkuu
- State Key Laboratory for Biology of Plant Diseases and Insect PestsInstitute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina
| | - Guangyue Li
- State Key Laboratory for Biology of Plant Diseases and Insect PestsInstitute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina
| | - Xiufen Yang
- State Key Laboratory for Biology of Plant Diseases and Insect PestsInstitute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina
| | - Hongmei Zeng
- State Key Laboratory for Biology of Plant Diseases and Insect PestsInstitute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina
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60
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Solanský M, Mikulášek K, Zapletalová M, Petřivalský M, Chiltz A, Zdráhal Z, Leborgne-Castel N, Lochman J. The oligomeric states of elicitins affect the hypersensitive response and resistance in tobacco. JOURNAL OF EXPERIMENTAL BOTANY 2021; 72:3219-3234. [PMID: 33475728 DOI: 10.1093/jxb/erab011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 01/19/2021] [Indexed: 06/12/2023]
Abstract
Successful plant defence against microbial pathogens is based on early recognition and fast activation of inducible responses. Key mechanisms include detection of microbe-associated molecular patterns by membrane-localized pattern recognition receptors that induce a basal resistance response. A well-described model of such responses to pathogens involves the interactions between Solanaceae plants and proteinaceous elicitors secreted by oomycetes, called elicitins. It has been hypothesized that the formation of oligomeric structures by elicitins could be involved in their recognition and activation of defensive transduction cascades. In this study, we tested this hypothesis using several approaches, and we observed differences in tobacco plant responses induced by the elicitin β-cryptogein (β-CRY) and its homodimer, β-CRYDIM. We also found that the C-terminal domain of elicitins of other ELI (true-elicitin) clades plays a significant role in stabilization of their oligomeric structure and restraint in the cell wall. In addition, covalently cross-linking β-CRYDIM impaired the formation of signalling complexes, thereby reducing its capacity to elicit the hypersensitive response and resistance in the host plant, with no significant changes in pathogenesis-related protein expression. By revealing the details of the effects of β-CRY dimerization on recognition and defence responses in tobacco, our results shed light on the poorly understood role of elicitins' oligomeric structures in the interactions between oomycetes and plants.
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Affiliation(s)
- Martin Solanský
- Department of Biochemistry, Faculty of Science, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic
| | - Kamil Mikulášek
- Central European Institute of Technology, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Martina Zapletalová
- Department of Biochemistry, Faculty of Science, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic
| | - Marek Petřivalský
- Department of Biochemistry, Department of Botany, Faculty of Science, Palacký University, Šlechtitelů 27, 78371 Olomouc, Czech Republic
| | - Annick Chiltz
- Agroécologie, AgroSup Dijon, CNRS, INRAE, Université Bourgogne Franche-Comté, F-21000 Dijon, France
| | - Zbyněk Zdráhal
- Central European Institute of Technology, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Nathalie Leborgne-Castel
- Agroécologie, AgroSup Dijon, CNRS, INRAE, Université Bourgogne Franche-Comté, F-21000 Dijon, France
| | - Jan Lochman
- Department of Biochemistry, Faculty of Science, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic
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61
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Liu X, Ao K, Yao J, Zhang Y, Li X. Engineering plant disease resistance against biotrophic pathogens. CURRENT OPINION IN PLANT BIOLOGY 2021; 60:101987. [PMID: 33434797 DOI: 10.1016/j.pbi.2020.101987] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 11/29/2020] [Accepted: 12/04/2020] [Indexed: 06/12/2023]
Abstract
Breeding for disease resistance against microbial pathogens is essential for food security in modern agriculture. Conventional breeding, although widely accepted, is time consuming. An alternative approach is generating crop plants with desirable traits through genetic engineering. The collective efforts of many labs in the past 30 years have led to a comprehensive understanding of how plant immunity is achieved, enabling the application of genetic engineering to enhance disease resistance in crop plants. Here, we briefly review the engineering of disease resistance against biotrophic pathogens using various components of the plant immune system. Recent breakthroughs in immune receptors signaling and systemic acquired resistance (SAR), along with innovations in precise gene editing methods, provide exciting new opportunities for the development of improved environmentally friendly crop varieties that are disease resistant and high-yield.
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Affiliation(s)
- Xueru Liu
- Michael Smith Laboratories, University of British Columbia, Rm 301, 2185 East Mall, Vancouver, BC V6T 1Z4, Canada; Department of Botany, University of British Columbia, Rm 3156, 6270 University Blvd, Vancouver, BC V6T 1Z4, Canada
| | - Kevin Ao
- Michael Smith Laboratories, University of British Columbia, Rm 301, 2185 East Mall, Vancouver, BC V6T 1Z4, Canada; Department of Botany, University of British Columbia, Rm 3156, 6270 University Blvd, Vancouver, BC V6T 1Z4, Canada
| | - Jia Yao
- College of Life Science, Chongqing University, 55 University Town South Road, Shapingba District, Chongqing, China
| | - Yuelin Zhang
- Department of Botany, University of British Columbia, Rm 3156, 6270 University Blvd, Vancouver, BC V6T 1Z4, Canada
| | - Xin Li
- Michael Smith Laboratories, University of British Columbia, Rm 301, 2185 East Mall, Vancouver, BC V6T 1Z4, Canada; Department of Botany, University of British Columbia, Rm 3156, 6270 University Blvd, Vancouver, BC V6T 1Z4, Canada.
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62
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Chavarro‐Carrero EA, Vermeulen JP, E. Torres D, Usami T, Schouten HJ, Bai Y, Seidl MF, Thomma BPHJ. Comparative genomics reveals the in planta-secreted Verticillium dahliae Av2 effector protein recognized in tomato plants that carry the V2 resistance locus. Environ Microbiol 2021; 23:1941-1958. [PMID: 33078534 PMCID: PMC8246953 DOI: 10.1111/1462-2920.15288] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 10/16/2020] [Accepted: 10/18/2020] [Indexed: 12/12/2022]
Abstract
Plant pathogens secrete effector molecules during host invasion to promote colonization. However, some of these effectors become recognized by host receptors to mount a defence response and establish immunity. Recently, a novel resistance was identified in wild tomato, mediated by the single dominant V2 locus, to control strains of the soil-borne vascular wilt fungus Verticillium dahliae that belong to race 2. With comparative genomics of race 2 strains and resistance-breaking race 3 strains, we identified the avirulence effector that activates V2 resistance, termed Av2. We identified 277 kb of race 2-specific sequence comprising only two genes encoding predicted secreted proteins that are expressed during tomato colonization. Subsequent functional analysis based on genetic complementation into race 3 isolates and targeted deletion from the race 1 isolate JR2 and race 2 isolate TO22 confirmed that one of the two candidates encodes the avirulence effector Av2 that is recognized in V2 tomato plants. Two Av2 allelic variants were identified that encode Av2 variants that differ by a single acid. Thus far, a role in virulence could not be demonstrated for either of the two variants.
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Affiliation(s)
| | - Jasper P. Vermeulen
- Laboratory of PhytopathologyWageningen University and ResearchWageningen6708 PBThe Netherlands
- Laboratory of Plant BreedingWageningen University and ResearchWageningen6708 PBThe Netherlands
| | - David E. Torres
- Laboratory of PhytopathologyWageningen University and ResearchWageningen6708 PBThe Netherlands
- Theoretical Biology and Bioinformatics Group, Department of BiologyUtrecht UniversityUtrechtThe Netherlands
| | - Toshiyuki Usami
- Graduate School of HorticultureChiba UniversityMatsudo, Chiba271‐8510Japan
| | - Henk J. Schouten
- Laboratory of Plant BreedingWageningen University and ResearchWageningen6708 PBThe Netherlands
| | - Yuling Bai
- Laboratory of Plant BreedingWageningen University and ResearchWageningen6708 PBThe Netherlands
| | - Michael F. Seidl
- Laboratory of PhytopathologyWageningen University and ResearchWageningen6708 PBThe Netherlands
- Theoretical Biology and Bioinformatics Group, Department of BiologyUtrecht UniversityUtrechtThe Netherlands
| | - Bart P. H. J. Thomma
- Laboratory of PhytopathologyWageningen University and ResearchWageningen6708 PBThe Netherlands
- Cluster of Excellence on Plant Sciences (CEPLAS)University of Cologne, Botanical InstituteCologneGermany
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63
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Xiang G, Yin X, Niu W, Chen T, Liu R, Shang B, Fu Q, Liu G, Ma H, Xu Y. Characterization of CRN-Like Genes From Plasmopara viticola: Searching for the Most Virulent Ones. Front Microbiol 2021; 12:632047. [PMID: 33868192 PMCID: PMC8044898 DOI: 10.3389/fmicb.2021.632047] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Accepted: 02/26/2021] [Indexed: 11/13/2022] Open
Abstract
Grapevine downy mildew is an insurmountable disease that endangers grapevine production and the wine industry worldwide. The causal agent of the disease is the obligate biotrophic oomycete Plasmopara viticola, for which the pathogenic mechanism remains largely unknown. Crinkling and necrosis proteins (CRN) are an ancient class of effectors utilized by pathogens, including oomycetes, that interfere with host plant defense reactions. In this study, 27 CRN-like genes were cloned from the P. viticola isolate YL genome, hereafter referred to as PvCRN genes, and characterized in silico and in planta. PvCRN genes in ‘YL’ share high sequence identities with their ortholog genes in the other three previously sequenced P. viticola isolates. Sequence divergence among the genes in the PvCRN family indicates that different PvCRN genes have different roles. Phylogenetic analysis of the PvCRN and the CRN proteins encoded by genes in the P. halstedii genome suggests that various functions might have been acquired by the CRN superfamily through independent evolution of Plasmopara species. When transiently expressed in plant cells, the PvCRN protein family shows multiple subcellular localizations. None of the cloned PvCRN proteins induced hypersensitive response (HR)-like cell death on the downy mildew-resistant grapevine Vitis riparia. This was in accordance with the result that most PvCRN proteins, except PvCRN11, failed to induce necrosis in Nicotiana benthamiana. Pattern-triggered immunity (PTI) induced by INF1 was hampered by several PvCRN proteins. In addition, 15 PvCRN proteins prevented Bax-induced plant programmed cell death. Among the cell death-suppressing members, PvCRN17, PvCRN20, and PvCRN23 were found to promote the susceptibility of N. benthamiana to Phytophthora capsici, which is a semi-biotrophic oomycete. Moreover, the nucleus-targeting member, PvCRN19, promoted the susceptibility of N. benthamiana to P. capsici. Therefore, these PvCRN proteins were estimated to be virulent effectors involved in the pathogenicity of P. viticola YL. Collectively, this study provides comprehensive insight into the CRN effector repertoire of P. viticola YL, which will help further elucidate the molecular mechanisms of the pathogenesis of grapevine downy mildew.
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Affiliation(s)
- Gaoqing Xiang
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, College of Horticulture, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China
| | - Xiao Yin
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, College of Horticulture, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China
| | - Weili Niu
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, College of Horticulture, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China
| | - Tingting Chen
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, College of Horticulture, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China
| | - Ruiqi Liu
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, College of Horticulture, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China
| | - Boxing Shang
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, College of Horticulture, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China
| | - Qingqing Fu
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, College of Horticulture, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China
| | - Guotian Liu
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, College of Horticulture, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China
| | - Hui Ma
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, College of Horticulture, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China
| | - Yan Xu
- State Key Laboratory of Crop Stress Biology in Arid Areas, College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, College of Horticulture, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China
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Roudaire T, Héloir MC, Wendehenne D, Zadoroznyj A, Dubrez L, Poinssot B. Cross Kingdom Immunity: The Role of Immune Receptors and Downstream Signaling in Animal and Plant Cell Death. Front Immunol 2021; 11:612452. [PMID: 33763054 PMCID: PMC7982415 DOI: 10.3389/fimmu.2020.612452] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Accepted: 12/29/2020] [Indexed: 12/14/2022] Open
Abstract
Both plants and animals are endowed with sophisticated innate immune systems to combat microbial attack. In these multicellular eukaryotes, innate immunity implies the presence of cell surface receptors and intracellular receptors able to detect danger signal referred as damage-associated molecular patterns (DAMPs) and pathogen-associated molecular patterns (PAMPs). Membrane-associated pattern recognition receptors (PRRs), such as Toll-like receptors (TLRs), C-type lectin receptors (CLRs), receptor-like kinases (RLKs), and receptor-like proteins (RLPs) are employed by these organisms for sensing different invasion patterns before triggering antimicrobial defenses that can be associated with a form of regulated cell death. Intracellularly, animals nucleotide-binding and oligomerization domain (NOD)-like receptors or plants nucleotide-binding domain (NBD)-containing leucine rich repeats (NLRs) immune receptors likely detect effectors injected into the host cell by the pathogen to hijack the immune signaling cascade. Interestingly, during the co-evolution between the hosts and their invaders, key cross-kingdom cell death-signaling macromolecular NLR-complexes have been selected, such as the inflammasome in mammals and the recently discovered resistosome in plants. In both cases, a regulated cell death located at the site of infection constitutes a very effective mean for blocking the pathogen spread and protecting the whole organism from invasion. This review aims to describe the immune mechanisms in animals and plants, mainly focusing on cell death signaling pathways, in order to highlight recent advances that could be used on one side or the other to identify the missing signaling elements between the perception of the invasion pattern by immune receptors, the induction of defenses or the transmission of danger signals to other cells. Although knowledge of plant immunity is less advanced, these organisms have certain advantages allowing easier identification of signaling events, regulators and executors of cell death, which could then be exploited directly for crop protection purposes or by analogy for medical research.
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Affiliation(s)
- Thibault Roudaire
- Agroécologie, Agrosup Dijon, CNRS, INRAE, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, Dijon, France
| | - Marie-Claire Héloir
- Agroécologie, Agrosup Dijon, CNRS, INRAE, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, Dijon, France
| | - David Wendehenne
- Agroécologie, Agrosup Dijon, CNRS, INRAE, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, Dijon, France
| | - Aymeric Zadoroznyj
- Institut National de la Santé et de la Recherche Médicale (Inserm), LNC UMR1231, Dijon, France.,LNC UMR1231, Université de Bourgogne Franche-Comté, Dijon, France
| | - Laurence Dubrez
- Institut National de la Santé et de la Recherche Médicale (Inserm), LNC UMR1231, Dijon, France.,LNC UMR1231, Université de Bourgogne Franche-Comté, Dijon, France
| | - Benoit Poinssot
- Agroécologie, Agrosup Dijon, CNRS, INRAE, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, Dijon, France
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65
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Nie J, Zhou W, Liu J, Tan N, Zhou JM, Huang L. A receptor-like protein from Nicotiana benthamiana mediates VmE02 PAMP-triggered immunity. THE NEW PHYTOLOGIST 2021; 229:2260-2272. [PMID: 33037676 DOI: 10.1111/nph.16995] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 10/04/2020] [Indexed: 05/27/2023]
Abstract
Plants use their innate immune system to defend against phytopathogens. As a part of this, pattern triggered-immunity is activated via pattern recognition receptor (PRR) detection of pathogen-associated molecular patterns (PAMPs). Although an increasing number of PAMPs have been identified, the PRRs for their recognition remain largely unknown. In the present study, we report a receptor-like protein RE02 (Response to VmE02) in Nicotiana benthamiana, which mediates the perception of VmE02, a PAMP previously identified from the phytopathogenic fungus Valsa mali, using virus-induced gene silencing (VIGS), co-immunoprecipitation, pull-down and microscale thermophoresis assays. We show that silencing of RE02 markedly attenuated VmE02-triggred cell death and immune responses. RE02 specifically interacted with VmE02 in vivo and in vitro, and it displayed a high affinity for VmE02. Formation of a complex with the receptor-like kinases SOBIR1 and BAK1 was essential for RE02 to perceive VmE02. Moreover, RE02-silenced plants exhibited enhanced susceptibility to both the oomycete Phytophthora capsici and the fungus Sclerotinia sclerotiorum, while overexpression of RE02 increased plant resistance to these pathogens. Together, our results indicate that the PAMP VmE02 and the receptor-like protein RE02 represent a new ligand-receptor pair in plant immunity, and that RE02 represents a promising target for engineering disease resistance.
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Affiliation(s)
- Jiajun Nie
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Wenjing Zhou
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Jianying Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Ni Tan
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Jian-Min Zhou
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Lili Huang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
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66
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Li Q, Wang B, Yu J, Dou D. Pathogen-informed breeding for crop disease resistance. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2021; 63:305-311. [PMID: 33095498 DOI: 10.1111/jipb.13029] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 10/19/2020] [Indexed: 06/11/2023]
Abstract
The development of durable and broad-spectrum resistance is an economical and eco-friendly approach to control crop diseases for sustainable agricultural production. Emerging knowledge of the molecular basis of pathogenesis and plant-pathogen interactions has contributed to the development of novel pathogen-informed breeding strategies beyond the limits imposed by conventional breeding. Here, we review the current status of pathogen-assisted resistance-related gene cloning. We also describe how pathogen effector proteins can be used to identify resistance resources and to inform cultivar deployment. Finally, we summarize the main approaches for pathogen-directed plant improvement, including transgenesis and genome editing. Thus, we describe the emerging role of pathogen-related studies in the breeding of disease-resistant varieties, and propose innovative pathogen-informed strategies for future applications.
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Affiliation(s)
- Qi Li
- Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, 210014, China
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Bi Wang
- Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, 210014, China
| | - Jinping Yu
- Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, 210014, China
| | - Daolong Dou
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
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67
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Del Mar Martínez-Prada M, Curtin SJ, Gutiérrez-González JJ. Potato improvement through genetic engineering. GM CROPS & FOOD 2021; 12:479-496. [PMID: 34991415 PMCID: PMC9208627 DOI: 10.1080/21645698.2021.1993688] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Potato (Solanum tuberosum L.) is the third most important crop worldwide and a staple food for many people worldwide. Genetically, it poses many challenges for traditional breeding due to its autotetraploid nature and its tendency toward inbreeding depression. Breeding programs have focused on productivity, nutritional quality, and disease resistance. Some of these traits exist in wild potato relatives but their introgression into elite cultivars can take many years and, for traits such as pest resistance, their effect is often short-lasting. These problems can be addressed by genetic modification (GM) or gene editing (GE) and open a wide horizon for potato crop improvement. Current genetically modified and gene edited varieties include those with Colorado potato beetle and late blight resistance, reduction in acrylamide, and modified starch content. RNAi hairpin technology can be used to silence the haplo-alleles of multiple genes simultaneously, whereas optimization of newer gene editing technologies such as base and prime editing will facilitate the routine generation of advanced edits across the genome. These technologies will likely gain further relevance as increased target specificity and decreased off-target effects are demonstrated. In this Review, we discuss recent work related to these technologies in potato improvement.
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Affiliation(s)
- María Del Mar Martínez-Prada
- Departamento De Biología Molecular, Facultad De Ciencias Biológicas Y Ambientales, Universidad De León, León, España
| | - Shaun J Curtin
- United States Department of Agriculture, Plant Science Research Unit, Minnesota, USA.,Department of Agronomy and Plant Genetics, University of Minnesota, Minnesota, USA.,Center for Plant Precision Genomics, University of Minnesota, Minneapolis, Minnesota, USA.,Center for Genome Engineering, University of Minnesota, Minneapolis, Minnesota, USA
| | - Juan J Gutiérrez-González
- Departamento De Biología Molecular, Facultad De Ciencias Biológicas Y Ambientales, Universidad De León, León, España
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68
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Torres Ascurra Y, Lin X, Wolters PJ, Vleeshouwers VGAA. Identification of Solanum Immune Receptors by Bulked Segregant RNA-Seq and High-Throughput Recombinant Screening. Methods Mol Biol 2021; 2354:315-330. [PMID: 34448167 DOI: 10.1007/978-1-0716-1609-3_15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The identification, understanding, and deployment of immune receptors are crucial to achieve high-level and durable resistance for crops against pathogens. In potato, many R genes have been identified using map-based cloning strategies. However, this is a challenging and laborious task that involves the development of a high number of molecular markers for the initial mapping, and the screening of thousands of plants for fine mapping. Bulked segregant RNA-Seq (BSR-Seq) has proven to be an efficient technique for the mapping of resistance genes. The RNA from two bulks of plants with contrasting phenotypes is sequenced and analyzed to identify single-nucleotide polymorphism (SNPs) markers linked to the target gene. Subsequently, the SNP markers that are identified can be used to delimit the mapping interval. Additionally, we designed an in vitro recombinant screening strategy that is advantageous for analyzing a large number of plants, in terms of time, space, and cost. Tips and detailed protocols, including BSR-Seq, bioinformatic analysis, and recombinant screening, are provided in this chapter.
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Affiliation(s)
- Yerisf Torres Ascurra
- Wageningen UR Plant Breeding, Wageningen University and Research, Wageningen, The Netherlands
| | - Xiao Lin
- Wageningen UR Plant Breeding, Wageningen University and Research, Wageningen, The Netherlands
| | - Pieter J Wolters
- Wageningen UR Plant Breeding, Wageningen University and Research, Wageningen, The Netherlands
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69
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Perrine-Walker F. Phytophthora palmivora-Cocoa Interaction. J Fungi (Basel) 2020; 6:jof6030167. [PMID: 32916858 PMCID: PMC7558484 DOI: 10.3390/jof6030167] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 08/28/2020] [Accepted: 09/07/2020] [Indexed: 12/21/2022] Open
Abstract
Phytophthora palmivora (Butler) is an hemibiotrophic oomycete capable of infecting over 200 plant species including one of the most economically important crops, Theobroma cacao L. commonly known as cocoa. It infects many parts of the cocoa plant including the pods, causing black pod rot disease. This review will focus on P. palmivora’s ability to infect a plant host to cause disease. We highlight some current findings in other Phytophthora sp. plant model systems demonstrating how the germ tube, the appressorium and the haustorium enable the plant pathogen to penetrate a plant cell and how they contribute to the disease development in planta. This review explores the molecular exchange between the oomycete and the plant host, and the role of plant immunity during the development of such structures, to understand the infection of cocoa pods by P. palmivora isolates from Papua New Guinea.
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Affiliation(s)
- Francine Perrine-Walker
- School of Life and Environmental Sciences, The University of Sydney, LEES Building (F22), Camperdown, NSW 2006, Australia;
- The University of Sydney Institute of Agriculture, 1 Central Avenue, Australian Technology Park, Eveleigh, NSW 2015, Australia
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70
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Martin RL, Le Boulch P, Clin P, Schwarzenberg A, Yvin JC, Andrivon D, Nguema-Ona E, Val F. A comparison of PTI defense profiles induced in Solanum tuberosum by PAMP and non-PAMP elicitors shows distinct, elicitor-specific responses. PLoS One 2020; 15:e0236633. [PMID: 32785249 PMCID: PMC7423108 DOI: 10.1371/journal.pone.0236633] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 07/10/2020] [Indexed: 01/01/2023] Open
Abstract
The induction of general plant defense responses following the perception of external elicitors is now regarded as the first level of the plant immune response. Depending on the involvement or not of these molecules in pathogenicity, this induction of defense is called either Pathogen-Associated Molecular Pattern (PAMP) Triggered Immunity or Pattern Triggered Immunity-both abbreviated to PTI. Because PTI is assumed to be a widespread and stable form of resistance to infection, understanding the mechanisms driving it becomes a major goal for the sustainable management of plant-pathogen interactions. However, the induction of PTI is complex. Our hypotheses are that (i) the recognition by the plant of PAMPs vs non-PAMP elicitors leads to specific defense profiles and (ii) the responses specifically induced by PAMPs target critical life history traits of the pathogen that produced them. We thus analyzed, using a metabolomic approach coupled with transcriptomic and hormonal analyses, the defense profiles induced in potato foliage treated with either a Concentrated Culture Filtrate (CCF) from Phytophthora infestans or two non-PAMP preparations, β-aminobutyric acid (BABA) and an Ulva spp. Extract, used separately. Each elicitor induced specific defense profiles. CCF up-regulated sesquiterpenes but down-regulated sterols and phenols, notably α-chaconine, caffeoyl quinic acid and rutin, which decreased spore production of P. infestans in vitro. CCF thus induces both defense and counter-defense responses. By contrast, the Ulva extract triggered the synthesis of a large-spectrum of antimicrobial compounds through the phenylpropanoid/flavonoid pathways, while BABA targeted the primary metabolism. Hence, PTI can be regarded as a heterogeneous set of general and pathogen-specific responses triggered by the molecular signatures of each elicitor, rather than as a uniform, non-specific and broad-spectrum set of general defense reactions.
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Affiliation(s)
- Rafaela Lopes Martin
- AGROCAMPUS-OUEST, UMR IGEPP 1349-Institut de Génétique, Environnement et Protection des Plantes, Rennes, France
- Centre Mondial de l’Innovation Roullier, Laboratoire de Nutrition Végétale, Pôle Stress Biotiques, Saint Malo, France
| | - Pauline Le Boulch
- AGROCAMPUS-OUEST, UMR IGEPP 1349-Institut de Génétique, Environnement et Protection des Plantes, Rennes, France
| | - Pauline Clin
- AGROCAMPUS-OUEST, UMR IGEPP 1349-Institut de Génétique, Environnement et Protection des Plantes, Rennes, France
| | - Adrián Schwarzenberg
- Centre Mondial de l’Innovation Roullier, Laboratoire de Nutrition Végétale, Pôle Stress Biotiques, Saint Malo, France
| | - Jean-Claude Yvin
- Centre Mondial de l’Innovation Roullier, Laboratoire de Nutrition Végétale, Pôle Stress Biotiques, Saint Malo, France
| | - Didier Andrivon
- INRAE, UMR IGEPP 1349-Institut de Génétique, Environnement et Protection des Plantes, Le Rheu, France
| | - Eric Nguema-Ona
- Centre Mondial de l’Innovation Roullier, Laboratoire de Nutrition Végétale, Pôle Stress Biotiques, Saint Malo, France
| | - Florence Val
- AGROCAMPUS-OUEST, UMR IGEPP 1349-Institut de Génétique, Environnement et Protection des Plantes, Rennes, France
- Centre Mondial de l’Innovation Roullier, Laboratoire de Nutrition Végétale, Pôle Stress Biotiques, Saint Malo, France
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71
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Purayannur S, Cano LM, Bowman MJ, Childs KL, Gent DH, Quesada-Ocampo LM. The Effector Repertoire of the Hop Downy Mildew Pathogen Pseudoperonospora humuli. Front Genet 2020; 11:910. [PMID: 32849854 PMCID: PMC7432248 DOI: 10.3389/fgene.2020.00910] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 07/22/2020] [Indexed: 01/18/2023] Open
Abstract
Pseudoperonospora humuli is an obligate biotrophic oomycete that causes downy mildew (DM), one of the most destructive diseases of cultivated hop that can lead to 100% crop loss in susceptible cultivars. We used the published genome of P. humuli to predict the secretome and effectorome and analyze the transcriptome variation among diverse isolates and during infection of hop leaves. Mining the predicted coding genes of the sequenced isolate OR502AA of P. humuli revealed a secretome of 1,250 genes. We identified 296 RXLR and RXLR-like effector-encoding genes in the secretome. Among the predicted RXLRs, there were several WY-motif-containing effectors that lacked canonical RXLR domains. Transcriptome analysis of sporangia from 12 different isolates collected from various hop cultivars revealed 754 secreted proteins and 201 RXLR effectors that showed transcript evidence across all isolates with reads per kilobase million (RPKM) values > 0. RNA-seq analysis of OR502AA-infected hop leaf samples at different time points after infection revealed highly expressed effectors that may play a relevant role in pathogenicity. Quantitative RT-PCR analysis confirmed the differential expression of selected effectors. We identified a set of P. humuli core effectors that showed transcript evidence in all tested isolates and elevated expression during infection. These effectors are ideal candidates for functional analysis and effector-assisted breeding to develop DM resistant hop cultivars.
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Affiliation(s)
- Savithri Purayannur
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, United States
| | - Liliana M. Cano
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, United States
- Indian River Research and Education Center, Department of Plant Pathology, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, FL, United States
| | - Megan J. Bowman
- Department of Plant Biology, Michigan State University, East Lansing, MI, United States
- Ball Horticultural Company, West Chicago, IL, United States
| | - Kevin L. Childs
- Department of Plant Biology, Michigan State University, East Lansing, MI, United States
| | - David H. Gent
- United States Department of Agriculture-Agricultural Research Service, Forage Seed and Cereal Research Unit, Oregon State University, Corvallis, OR, United States
| | - Lina M. Quesada-Ocampo
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, United States
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72
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Zhang F, Batley J. Exploring the application of wild species for crop improvement in a changing climate. CURRENT OPINION IN PLANT BIOLOGY 2020; 56:218-222. [PMID: 32029361 DOI: 10.1016/j.pbi.2019.12.013] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 12/27/2019] [Accepted: 12/27/2019] [Indexed: 06/10/2023]
Abstract
Modern agriculture is currently facing challenges from a burgeoning population and changing climate, which requires improved crops with adaptation to climate and elite yield and quality traits. While there is a breeding bottleneck caused by intensive selection, gene banks containing conserved wild relatives and landraces can be used as breeding resources. However, with limited genetic information available on these wild relatives, the application has been hindered. With the development of both genomics and bioinformatics techniques, it is now easier to identify the genetic variation in wild species, which can be utilized for the introgression of elite traits. These wild species can therefore play an important role in food security and breeding sustainability.
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Affiliation(s)
- Fangning Zhang
- School of Biological Sciences and Institute of Agriculture, University of Western Australia, Crawley 6009, Australia
| | - Jacqueline Batley
- School of Biological Sciences and Institute of Agriculture, University of Western Australia, Crawley 6009, Australia.
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73
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Lin X, Armstrong M, Baker K, Wouters D, Visser RGF, Wolters PJ, Hein I, Vleeshouwers VGAA. RLP/K enrichment sequencing; a novel method to identify receptor-like protein (RLP) and receptor-like kinase (RLK) genes. THE NEW PHYTOLOGIST 2020; 227:1264-1276. [PMID: 32285454 PMCID: PMC7383770 DOI: 10.1111/nph.16608] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Accepted: 03/27/2020] [Indexed: 05/29/2023]
Abstract
The identification of immune receptors in crop plants is time-consuming but important for disease control. Previously, resistance gene enrichment sequencing (RenSeq) was developed to accelerate mapping of nucleotide-binding domain and leucine-rich repeat containing (NLR) genes. However, resistances mediated by pattern recognition receptors (PRRs) remain less utilized. Here, our pipeline shows accelerated mapping of PRRs. Effectoromics leads to precise identification of plants with target PRRs, and subsequent RLP/K enrichment sequencing (RLP/KSeq) leads to detection of informative single nucleotide polymorphisms that are linked to the trait. Using Phytophthora infestans as a model, we identified Solanum microdontum plants that recognize the apoplastic effectors INF1 or SCR74. RLP/KSeq in a segregating Solanum population confirmed the localization of the INF1 receptor on chromosome 12, and led to the rapid mapping of the response to SCR74 to chromosome 9. By using markers obtained from RLP/KSeq in conjunction with additional markers, we fine-mapped the SCR74 receptor to a 43-kbp G-LecRK locus. Our findings show that RLP/KSeq enables rapid mapping of PRRs and is especially beneficial for crop plants with large and complex genomes. This work will enable the elucidation and characterization of the nonNLR plant immune receptors and ultimately facilitate informed resistance breeding.
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Affiliation(s)
- Xiao Lin
- Plant BreedingWageningen University and ResearchDroevendaalsesteeg 16708PBWageningenthe Netherlands
| | - Miles Armstrong
- Cell and Molecular SciencesThe James Hutton InstituteDundeeDD2 5DAUK
| | - Katie Baker
- Cell and Molecular SciencesThe James Hutton InstituteDundeeDD2 5DAUK
| | - Doret Wouters
- Plant BreedingWageningen University and ResearchDroevendaalsesteeg 16708PBWageningenthe Netherlands
| | - Richard G. F. Visser
- Plant BreedingWageningen University and ResearchDroevendaalsesteeg 16708PBWageningenthe Netherlands
| | - Pieter J. Wolters
- Plant BreedingWageningen University and ResearchDroevendaalsesteeg 16708PBWageningenthe Netherlands
| | - Ingo Hein
- Cell and Molecular SciencesThe James Hutton InstituteDundeeDD2 5DAUK
- Division of Plant SciencesSchool of Life SciencesUniversity of Dundee at the James Hutton InstituteDundeeDD2 5DAUK
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74
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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: 19] [Impact Index Per Article: 4.8] [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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75
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Wei Y, Balaceanu A, Rufian JS, Segonzac C, Zhao A, Morcillo RJL, Macho AP. An immune receptor complex evolved in soybean to perceive a polymorphic bacterial flagellin. Nat Commun 2020; 11:3763. [PMID: 32724132 PMCID: PMC7387336 DOI: 10.1038/s41467-020-17573-y] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 07/05/2020] [Indexed: 11/18/2022] Open
Abstract
In both animals and plants, the perception of bacterial flagella by immune receptors elicits the activation of defence responses. Most plants are able to perceive the highly conserved epitope flg22 from flagellin, the main flagellar protein, from most bacterial species. However, flagellin from Ralstonia solanacearum, the causal agent of the bacterial wilt disease, presents a polymorphic flg22 sequence (flg22Rso) that avoids perception by all plants studied to date. In this work, we show that soybean has developed polymorphic versions of the flg22 receptors that are able to perceive flg22Rso. Furthermore, we identify key residues responsible for both the evasion of perception by flg22Rso in Arabidopsis and the gain of perception by the soybean receptors. Heterologous expression of the soybean flg22 receptors in susceptible plant species, such as tomato, enhances resistance to bacterial wilt disease, demonstrating the potential of these receptors to enhance disease resistance in crop plants.
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Affiliation(s)
- Yali Wei
- Shanghai Center for Plant Stress Biology, CAS Center for Excellence in Molecular Plant Sciences; Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Alexandra Balaceanu
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology (BIST), 08028, Barcelona, Spain
| | - Jose S Rufian
- Shanghai Center for Plant Stress Biology, CAS Center for Excellence in Molecular Plant Sciences; Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
| | - Cécile Segonzac
- Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, 08826, Republic of Korea
| | - Achen Zhao
- Shanghai Center for Plant Stress Biology, CAS Center for Excellence in Molecular Plant Sciences; Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Rafael J L Morcillo
- Shanghai Center for Plant Stress Biology, CAS Center for Excellence in Molecular Plant Sciences; Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
| | - Alberto P Macho
- Shanghai Center for Plant Stress Biology, CAS Center for Excellence in Molecular Plant Sciences; Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai, 201602, China.
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76
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Meade F, Hutten R, Wagener S, Prigge V, Dalton E, Kirk HG, Griffin D, Milbourne D. Detection of Novel QTLs for Late Blight Resistance Derived from the Wild Potato Species Solanum microdontum and Solanum pampasense. Genes (Basel) 2020; 11:E732. [PMID: 32630103 PMCID: PMC7396981 DOI: 10.3390/genes11070732] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 06/09/2020] [Accepted: 06/17/2020] [Indexed: 12/30/2022] Open
Abstract
Wild potato species continue to be a rich source of genes for resistance to late blight in potato breeding. Whilst many dominant resistance genes from such sources have been characterised and used in breeding, quantitative resistance also offers potential for breeding when the loci underlying the resistance can be identified and tagged using molecular markers. In this study, F1 populations were created from crosses between blight susceptible parents and lines exhibiting strong partial resistance to late blight derived from the South American wild species Solanum microdontum and Solanum pampasense. Both populations exhibited continuous variation for resistance to late blight over multiple field-testing seasons. High density genetic maps were created using single nucleotide polymorphism (SNP) markers, enabling mapping of quantitative trait loci (QTLs) for late blight resistance that were consistently expressed over multiple years in both populations. In the population created with the S. microdontum source, QTLs for resistance consistently expressed over three years and explaining a large portion (21-47%) of the phenotypic variation were found on chromosomes 5 and 6, and a further resistance QTL on chromosome 10, apparently related to foliar development, was discovered in 2016 only. In the population created with the S. pampasense source, QTLs for resistance were found in over two years on chromosomes 11 and 12. For all loci detected consistently across years, the QTLs span known R gene clusters and so they likely represent novel late blight resistance genes. Simple genetic models following the effect of the presence or absence of SNPs associated with consistently effective loci in both populations demonstrated that marker assisted selection (MAS) strategies to introgress and pyramid these loci have potential in resistance breeding strategies.
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Affiliation(s)
- Fergus Meade
- Teagasc, Crop Science Department, Oak Park, R93 XE12 Carlow, Ireland; (F.M.); (D.G.)
| | - Ronald Hutten
- Wageningen University & Research (WUR), 6708 PB Wageningen, The Netherlands;
| | - Silke Wagener
- SaKa Pflanzenzucht GmbH & Co., 22761 Hamburg, Germany; (S.W.); (V.P.)
| | - Vanessa Prigge
- SaKa Pflanzenzucht GmbH & Co., 22761 Hamburg, Germany; (S.W.); (V.P.)
| | | | | | - Denis Griffin
- Teagasc, Crop Science Department, Oak Park, R93 XE12 Carlow, Ireland; (F.M.); (D.G.)
| | - Dan Milbourne
- Teagasc, Crop Science Department, Oak Park, R93 XE12 Carlow, Ireland; (F.M.); (D.G.)
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77
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Lin X, Wang S, de Rond L, Bertolin N, Wouters RHM, Wouters D, Domazakis E, Bitew MK, Win J, Dong S, Visser RGF, Birch P, Kamoun S, Vleeshouwers VGAA. Divergent Evolution of PcF/SCR74 Effectors in Oomycetes Is Associated with Distinct Recognition Patterns in Solanaceous Plants. mBio 2020; 11:e00947-20. [PMID: 32605983 PMCID: PMC7327169 DOI: 10.1128/mbio.00947-20] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 06/02/2020] [Indexed: 01/03/2023] Open
Abstract
Plants deploy cell surface receptors known as pattern-recognition receptors (PRRs) that recognize non-self molecules from pathogens and microbes to defend against invaders. PRRs typically recognize microbe-associated molecular patterns (MAMPs) that are usually widely conserved, some even across kingdoms. Here, we report an oomycete-specific family of small secreted cysteine-rich (SCR) proteins that displays divergent patterns of sequence variation in the Irish potato famine pathogen Phytophthora infestans A subclass that includes the conserved effector PcF from Phytophthora cactorum activates immunity in a wide range of plant species. In contrast, the more diverse SCR74 subclass is specific to P. infestans and tends to trigger immune responses only in a limited number of wild potato genotypes. The SCR74 response was recently mapped to a G-type lectin receptor kinase (G-LecRK) locus in the wild potato Solanum microdontum subsp. gigantophyllum. The G-LecRK locus displays a high diversity in Solanum host species compared to other solanaceous plants. We propose that the diversification of the SCR74 proteins in P. infestans is driven by a fast coevolutionary arms race with cell surface immune receptors in wild potato, which contrasts the presumed slower dynamics between conserved apoplastic effectors and PRRs. Understanding the molecular determinants of plant immune responses to these divergent molecular patterns in oomycetes is expected to contribute to deploying multiple layers of disease resistance in crop plants.IMPORTANCE Immune receptors at the plant cell surface can recognize invading microbes. The perceived microbial molecules are typically widely conserved and therefore the matching surface receptors can detect a broad spectrum of pathogens. Here we describe a family of Phytophthora small extracellular proteins that consists of conserved subfamilies that are widely recognized by solanaceous plants. Remarkably, one subclass of SCR74 proteins is highly diverse, restricted to the late blight pathogen Phytophthora infestans and is specifically detected in wild potato plants. The diversification of this subfamily exhibits signatures of a coevolutionary arms race with surface receptors in potato. Insights into the molecular interaction between these potato-specific receptors and the recognized Phytophthora proteins are expected to contribute to disease resistance breeding in potato.
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Affiliation(s)
- Xiao Lin
- Wageningen UR Plant Breeding, Wageningen University and Research, Wageningen, The Netherlands
| | - Shumei Wang
- Cell and Molecular Sciences, The James Hutton Institute, Dundee, United Kingdom
| | - Laura de Rond
- Wageningen UR Plant Breeding, Wageningen University and Research, Wageningen, The Netherlands
| | - Nicoletta Bertolin
- Wageningen UR Plant Breeding, Wageningen University and Research, Wageningen, The Netherlands
| | - Roland H M Wouters
- Wageningen UR Plant Breeding, Wageningen University and Research, Wageningen, The Netherlands
| | - Doret Wouters
- Wageningen UR Plant Breeding, Wageningen University and Research, Wageningen, The Netherlands
| | - Emmanouil Domazakis
- Wageningen UR Plant Breeding, Wageningen University and Research, Wageningen, The Netherlands
| | - Mulusew Kassa Bitew
- Wageningen UR Plant Breeding, Wageningen University and Research, Wageningen, The Netherlands
| | - Joe Win
- The Sainsbury Laboratory, University of East Anglia, Norwich, United Kingdom
| | - Suomeng Dong
- The Sainsbury Laboratory, University of East Anglia, Norwich, United Kingdom
| | - Richard G F Visser
- Wageningen UR Plant Breeding, Wageningen University and Research, Wageningen, The Netherlands
| | - Paul Birch
- Cell and Molecular Sciences, The James Hutton Institute, Dundee, United Kingdom
- School of Life Sciences, Division of Plant Sciences, University of Dundee at the James Hutton Institute, Dundee, United Kingdom
| | - Sophien Kamoun
- The Sainsbury Laboratory, University of East Anglia, Norwich, United Kingdom
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78
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Li Y, Han Y, Qu M, Chen J, Chen X, Geng X, Wang Z, Chen S. Apoplastic Cell Death-Inducing Proteins of Filamentous Plant Pathogens: Roles in Plant-Pathogen Interactions. Front Genet 2020; 11:661. [PMID: 32676100 PMCID: PMC7333776 DOI: 10.3389/fgene.2020.00661] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 06/01/2020] [Indexed: 11/13/2022] Open
Abstract
Filamentous pathogens, such as phytopathogenic oomycetes and fungi, secrete a remarkable diversity of apoplastic effector proteins to facilitate infection, many of which are able to induce cell death in plants. Over the past decades, over 177 apoplastic cell death-inducing proteins (CDIPs) have been identified in filamentous oomycetes and fungi. An emerging number of studies have demonstrated the role of many apoplastic CDIPs as essential virulence factors. At the same time, apoplastic CDIPs have been documented to be recognized by plant cells as pathogen-associated molecular patterns (PAMPs). The recent findings of extracellular recognition of apoplastic CDIPs by plant leucine-rich repeat-receptor-like proteins (LRR-RLPs) have greatly advanced our understanding of how plants detect them and mount a defense response. This review summarizes the latest advances in identifying apoplastic CDIPs of plant pathogenic oomycetes and fungi, and our current understanding of the dual roles of apoplastic CDIPs in plant-filamentous pathogen interactions.
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Affiliation(s)
- Ya Li
- Marine and Agricultural Biotechnology Laboratory, Institute of Oceanography, Minjiang University, Fuzhou, China
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yijuan Han
- Marine and Agricultural Biotechnology Laboratory, Institute of Oceanography, Minjiang University, Fuzhou, China
| | - Mengyu Qu
- Marine and Agricultural Biotechnology Laboratory, Institute of Oceanography, Minjiang University, Fuzhou, China
| | - Jia Chen
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Xiaofeng Chen
- Marine and Agricultural Biotechnology Laboratory, Institute of Oceanography, Minjiang University, Fuzhou, China
| | - Xueqing Geng
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Zonghua Wang
- Marine and Agricultural Biotechnology Laboratory, Institute of Oceanography, Minjiang University, Fuzhou, China
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Songbiao Chen
- Marine and Agricultural Biotechnology Laboratory, Institute of Oceanography, Minjiang University, Fuzhou, China
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79
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Noman A, Aqeel M, Irshad MK, Qari SH, Hashem M, Alamri S, AbdulMajeed AM, Al-Sadi AM. Elicitins as molecular weapons against pathogens: consolidated biotechnological strategy for enhancing plant growth. Crit Rev Biotechnol 2020; 40:821-832. [PMID: 32546015 DOI: 10.1080/07388551.2020.1779174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
To fight against pathogens, defense systems in plants mainly depend upon preformed as well as induced responses. Pathogen detection activates induced responses and signals are transmitted for coordinated cellular events in order to restrict infection and spread. In spite of significant developments in manipulating genes, transcription factors and proteins for their involvement in immunity, absolute tolerance/resistance to pathogens has not been seen in plants/crops. Defense responses, among diverse plant types, to different pathogens involve modifications at the physio-biochemical and molecular levels. Secreted by oomycetes, elicitins are small, highly conserved and sterol-binding extracellular proteins with PAMP (pathogen associated molecular patterns) functions and are capable of eliciting plant defense reactions. Belonging to multigene families in oomycetes, elicitins are different from other plant proteins and show a different affinity for binding sterols and other lipids. These function for sterols binding to catalyze their inter-membrane and intra- as well as inter-micelle transport. Importantly, elicitins protect plants by inducing HR (hypersensitive response) and systemic acquired resistance. Despite immense metabolic significance and the involvement in defense activities, elicitins have not yet been fully studied and many questions regarding their functional activities remain to be explained. In order to address multiple questions associated with the role of elicitins, we have reviewed the understanding and topical advancements in plant defense mechanisms with a particular interest in elicitin-based defense actions and metabolic activities. This article offers potential attributes of elicitins as the biological control of plant diseases and can be considered as a baseline toward a more profound understanding of elicitins.
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Affiliation(s)
- Ali Noman
- Department of Botany, Government College University, Faisalabad, Pakistan
| | - Muhammad Aqeel
- State Key Laboratory of Grassland Agro-ecosystems, School of Life Science, Lanzhou University, Lanzhou, Gansu, PR China
| | - Muhammad Kashif Irshad
- Department of Environmental Sciences, Government College University, Faisalabad, Pakistan
| | - Sameer H Qari
- Biology Department, Aljumum University College, Umm Al-Qura University, Makkah, Saudi Arabia
| | - Mohamed Hashem
- College of Science, Department of Biology, King Khalid University, Abha, Saudi Arabia.,Faculty of Science, Botany and Microbiology Department, Assiut University, Assiut, Egypt
| | - Saad Alamri
- College of Science, Department of Biology, King Khalid University, Abha, Saudi Arabia.,Prince Sultan Ben Abdulaziz Center for Environmental and Tourism Research and Studies, King Khalid University, Abha, Saudi Arabia
| | - Awatif M AbdulMajeed
- Biology Department, Faculty of Science, University of Tabook, Umluj, Saudi Arabia
| | - Abdullah M Al-Sadi
- College of Agriculture and Marine Sciences, Sultan Qaboos University, Muscat, Oman
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80
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Li W, Deng Y, Ning Y, He Z, Wang GL. Exploiting Broad-Spectrum Disease Resistance in Crops: From Molecular Dissection to Breeding. ANNUAL REVIEW OF PLANT BIOLOGY 2020; 71:575-603. [PMID: 32197052 DOI: 10.1146/annurev-arplant-010720-022215] [Citation(s) in RCA: 99] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Plant diseases reduce crop yields and threaten global food security, making the selection of disease-resistant cultivars a major goal of crop breeding. Broad-spectrum resistance (BSR) is a desirable trait because it confers resistance against more than one pathogen species or against the majority of races or strains of the same pathogen. Many BSR genes have been cloned in plants and have been found to encode pattern recognition receptors, nucleotide-binding and leucine-rich repeat receptors, and defense-signaling and pathogenesis-related proteins. In addition, the BSR genes that underlie quantitative trait loci, loss of susceptibility and nonhost resistance have been characterized. Here, we comprehensively review the advances made in the identification and characterization of BSR genes in various species and examine their application in crop breeding. We also discuss the challenges and their solutions for the use of BSR genes in the breeding of disease-resistant crops.
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Affiliation(s)
- Wei Li
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Hunan Provincial Key Laboratory for Biology and Control of Plant Diseases and Insect Pests, College of Plant Protection, Hunan Agricultural University, Changsha 410128, China
| | - Yiwen Deng
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China;
| | - Yuese Ning
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Zuhua He
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China;
| | - Guo-Liang Wang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Department of Plant Pathology, The Ohio State University, Columbus, Ohio 43210, USA;
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81
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Chen T, Liu R, Dou M, Li M, Li M, Yin X, Liu GT, Wang Y, Xu Y. Insight Into Function and Subcellular Localization of Plasmopara viticola Putative RxLR Effectors. Front Microbiol 2020; 11:692. [PMID: 32373100 PMCID: PMC7186587 DOI: 10.3389/fmicb.2020.00692] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 03/25/2020] [Indexed: 12/15/2022] Open
Abstract
Grapevine downy mildew, caused by oomycete fungus Plasmopara viticola, is one of the most devastating diseases of grapes across the major production regions of the world. Although many putative effector molecules have been identified from this pathogen, the functions of the majority of these are still unknown. In this study, we analyzed the potential function of 26 P. viticola effectors from the highly virulent strain YL. Using transient expression in leaf cells of the tobacco Nicotiana benthamiana, we found that the majority of the effectors could suppress cell death triggered by BAX and INF1, while seven could induce cell death. The subcellular localization of effectors in N. benthamiana was consistent with their localization in cells of Vitis vinifera. Those effectors that localized to the nucleus (17/26) showed a variety of subnuclear localization. Ten of the effectors localized predominantly to the nucleolus, whereas the remaining seven localized to nucleoplasm. Interestingly, five of the effectors were strongly related in sequence and showed identical subcellular localization, but had different functions in N. benthamiana leaves and expression patterns in grapevine in response to P. viticola. This study highlights the potential functional diversity of P. viticola effectors.
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Affiliation(s)
- Tingting Chen
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, China
| | - Ruiqi Liu
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, China
| | - Mengru Dou
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, China
| | - Mengyuan Li
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, China
| | - Meijie Li
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, China
| | - Xiao Yin
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, China
| | - Guo-Tian Liu
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, China
| | - Yuejin Wang
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, China
| | - Yan Xu
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling, China.,College of Horticulture, Northwest A&F University, Yangling, China.,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, China
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82
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Woo JY, Kim YJ, Paek KH. CaLecRK-S.5, a pepper L-type lectin receptor kinase gene, accelerates Phytophthora elicitin-mediated defense response. Biochem Biophys Res Commun 2020; 524:951-956. [PMID: 32059849 DOI: 10.1016/j.bbrc.2020.02.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Accepted: 02/03/2020] [Indexed: 02/03/2023]
Abstract
Innate immunity in plants relies on the recognition of pathogen-associated molecular patterns (PAMPs) by pattern-recognition receptors (PRRs) located on the plant cell surface. CaLecRK-S.5, a pepper L-type lectin receptor kinase, has been shown to confer broad-spectrum resistance through priming activation. To further elucidate the molecular mechanism of CaLecRK-S.5, transgenic tobacco plants were generated in this study. Interestingly, hemizygous transgenic plants exhibited a high accumulation of CaLecRK-S.5, but this accumulation was completely abolished in homozygous transgenic plants by a cosuppression mechanism. Gain-of-function and loss-of-function analyses revealed that CaLecRK-S.5 plays a positive role in Phytophthora elicitin-mediated defense responses.
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Affiliation(s)
- Joo Yong Woo
- Department of Life Sciences, Korea University, Seoul, 02841, Republic of Korea
| | - Young Jin Kim
- Department of Life Sciences, Korea University, Seoul, 02841, Republic of Korea
| | - Kyung-Hee Paek
- Department of Life Sciences, Korea University, Seoul, 02841, Republic of Korea.
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83
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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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84
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Kim JH, Castroverde CDM. Diversity, Function and Regulation of Cell Surface and Intracellular Immune Receptors in Solanaceae. PLANTS 2020; 9:plants9040434. [PMID: 32244634 PMCID: PMC7238418 DOI: 10.3390/plants9040434] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 03/14/2020] [Accepted: 03/23/2020] [Indexed: 12/29/2022]
Abstract
The first layer of the plant immune system comprises plasma membrane-localized receptor proteins and intracellular receptors of the nucleotide-binding leucine-rich repeat protein superfamily. Together, these immune receptors act as a network of surveillance machines in recognizing extracellular and intracellular pathogen invasion-derived molecules, ranging from conserved structural epitopes to virulence-promoting effectors. Successful pathogen recognition leads to physiological and molecular changes in the host plants, which are critical for counteracting and defending against biotic attack. A breadth of significant insights and conceptual advances have been derived from decades of research in various model plant species regarding the structural complexity, functional diversity, and regulatory mechanisms of these plant immune receptors. In this article, we review the current state-of-the-art of how these host surveillance proteins function and how they are regulated. We will focus on the latest progress made in plant species belonging to the Solanaceae family, because of their tremendous importance as model organisms and agriculturally valuable crops.
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Affiliation(s)
- Jong Hum Kim
- Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, MI 48824, USA
- Howard Hughes Medical Institute, Michigan State University, East Lansing, MI 48824, USA
- Correspondence: (J.H.K.); (C.D.M.C.)
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85
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Dutra D, Agrawal N, Ghareeb H, Schirawski J. Screening of Secreted Proteins of Sporisorium reilianum f. sp. z eae for Cell Death Suppression in Nicotiana benthamiana. FRONTIERS IN PLANT SCIENCE 2020; 11:95. [PMID: 32140166 PMCID: PMC7042202 DOI: 10.3389/fpls.2020.00095] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Accepted: 01/22/2020] [Indexed: 05/17/2023]
Abstract
Sporisorium reilianum f. sp. zeae (SRZ) is a biotrophic fungus causing head smut in maize. Maize infection with SRZ leads to very little cell death suggesting the presence of cell-death suppressinpg effectors. Several hundred effector proteins have been predicted based on genome annotation, genome comparison, and bioinformatic analysis. For only very few of these effectors, an involvement in virulence has been shown. In this work, we started to test a considerable subset of these predicted effector proteins for a possible function in suppressing cell death. We generated an expression library of 62 proteins of SRZ under the control of a strong constitutive plant promoter for delivery into plant cells via Agrobacterium tumefaciens-mediated transient transformation. Potential apoplastic effectors with high cysteine content were cloned with signal peptide while potential intracellular effectors were also cloned without signal peptide to ensure proper localization after expression in plant cells. After infiltration of Nicotiana benthamiana leaves, infiltration sites were evaluated for apparent signs of hypersensitive cell death in absence or presence of the elicitin INF1 of Phytophthora infestans. None of the tested candidates was able to induce cell death, and most were unable to suppress INF1-induced cell death. However, the screen revealed one predicted cytoplasmic effector (sr16441) of SRZ that was able to reliably suppress INF1-induced cell death when transiently expressed in N. benthamiana lacking its predicted secretion signal peptide. This way, we discovered a putative function for one new effector of SRZ.
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Affiliation(s)
- Deiziane Dutra
- Microbial Genetics, Institute of Applied Microbiology, RWTH Aachen University, Aachen, Germany
| | - Nisha Agrawal
- Microbial Genetics, Institute of Applied Microbiology, RWTH Aachen University, Aachen, Germany
- Genetics, Matthias-Schleiden-Institute, Friedrich-Schiller-University Jena, Jena, Germany
| | - Hassan Ghareeb
- Plant Biotechnology, National Research Centre, Cairo, Egypt
- Molecular Biology of Plant-Microbe Interactions, Albrecht-von-Haller Institute of Plant Sciences, Schwann-Schleiden Research Center, Georg-August-University Göttingen, Göttingen, Germany
| | - Jan Schirawski
- Microbial Genetics, Institute of Applied Microbiology, RWTH Aachen University, Aachen, Germany
- Genetics, Matthias-Schleiden-Institute, Friedrich-Schiller-University Jena, Jena, Germany
- Molecular Biology of Plant-Microbe Interactions, Albrecht-von-Haller Institute of Plant Sciences, Schwann-Schleiden Research Center, Georg-August-University Göttingen, Göttingen, Germany
- *Correspondence: Jan Schirawski,
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86
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Naveed ZA, Wei X, Chen J, Mubeen H, Ali GS. The PTI to ETI Continuum in Phytophthora-Plant Interactions. FRONTIERS IN PLANT SCIENCE 2020; 11:593905. [PMID: 33391306 PMCID: PMC7773600 DOI: 10.3389/fpls.2020.593905] [Citation(s) in RCA: 69] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Accepted: 11/24/2020] [Indexed: 05/15/2023]
Abstract
Phytophthora species are notorious pathogens of several economically important crop plants. Several general elicitors, commonly referred to as Pathogen-Associated Molecular Patterns (PAMPs), from Phytophthora spp. have been identified that are recognized by the plant receptors to trigger induced defense responses in a process termed PAMP-triggered Immunity (PTI). Adapted Phytophthora pathogens have evolved multiple strategies to evade PTI. They can either modify or suppress their elicitors to avoid recognition by host and modulate host defense responses by deploying hundreds of effectors, which suppress host defense and physiological processes by modulating components involved in calcium and MAPK signaling, alternative splicing, RNA interference, vesicle trafficking, cell-to-cell trafficking, proteolysis and phytohormone signaling pathways. In incompatible interactions, resistant host plants perceive effector-induced modulations through resistance proteins and activate downstream components of defense responses in a quicker and more robust manner called effector-triggered-immunity (ETI). When pathogens overcome PTI-usually through effectors in the absence of R proteins-effectors-triggered susceptibility (ETS) ensues. Qualitatively, many of the downstream defense responses overlap between PTI and ETI. In general, these multiple phases of Phytophthora-plant interactions follow the PTI-ETS-ETI paradigm, initially proposed in the zigzag model of plant immunity. However, based on several examples, in Phytophthora-plant interactions, boundaries between these phases are not distinct but are rather blended pointing to a PTI-ETI continuum.
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Affiliation(s)
- Zunaira Afzal Naveed
- Department of Plant Pathology, Institute of Food and Agriculture Sciences, University of Florida, Gainesville, FL, United States
- Mid-Florida Research and Education Center, Institute of Food and Agriculture Sciences, University of Florida, Apopka, FL, United States
| | - Xiangying Wei
- Mid-Florida Research and Education Center, Institute of Food and Agriculture Sciences, University of Florida, Apopka, FL, United States
- Institute of Oceanography, Minjiang University, Fuzhou, China
- Xiangying Wei
| | - Jianjun Chen
- Mid-Florida Research and Education Center, Institute of Food and Agriculture Sciences, University of Florida, Apopka, FL, United States
| | - Hira Mubeen
- Departement of Biotechnology, University of Central Punjab, Lahore, Pakistan
| | - Gul Shad Ali
- Department of Plant Pathology, Institute of Food and Agriculture Sciences, University of Florida, Gainesville, FL, United States
- Mid-Florida Research and Education Center, Institute of Food and Agriculture Sciences, University of Florida, Apopka, FL, United States
- EukaryoTech LLC, Apopka, FL, United States
- *Correspondence: Gul Shad Ali
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87
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Early Pep-13-induced immune responses are SERK3A/B-dependent in potato. Sci Rep 2019; 9:18380. [PMID: 31804581 PMCID: PMC6895089 DOI: 10.1038/s41598-019-54944-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Accepted: 11/18/2019] [Indexed: 01/14/2023] Open
Abstract
Potato plants treated with the pathogen-associated molecular pattern Pep-13 mount salicylic acid- and jasmonic acid-dependent defense responses, leading to enhanced resistance against Phytophthora infestans, the causal agent of late blight disease. Recognition of Pep-13 is assumed to occur by binding to a yet unknown plasma membrane-localized receptor kinase. The potato genes annotated to encode the co-receptor BAK1, StSERK3A and StSERK3B, are activated in response to Pep-13 treatment. Transgenic RNAi-potato plants with reduced expression of both SERK3A and SERK3B were generated. In response to Pep-13 treatment, the formation of reactive oxygen species and MAP kinase activation, observed in wild type plants, is highly reduced in StSERK3A/B-RNAi plants, suggesting that StSERK3A/B are required for perception of Pep-13 in potato. In contrast, defense gene expression is induced by Pep-13 in both control and StSERK3A/B-depleted plants. Altered morphology of StSERK3A/B-RNAi plants correlates with major shifts in metabolism, as determined by untargeted metabolite profiling. Enhanced levels of hydroxycinnamic acid amides, typical phytoalexins of potato, in StSERK3A/B-RNAi plants are accompanied by significantly decreased levels of flavonoids and steroidal glycoalkaloids. Thus, altered metabolism in StSERK3A/B-RNAi plants correlates with the ability of StSERK3A/B-depleted plants to mount defense, despite highly decreased early immune responses.
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88
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Schellenberger R, Touchard M, Clément C, Baillieul F, Cordelier S, Crouzet J, Dorey S. Apoplastic invasion patterns triggering plant immunity: plasma membrane sensing at the frontline. MOLECULAR PLANT PATHOLOGY 2019; 20:1602-1616. [PMID: 31353775 PMCID: PMC6804340 DOI: 10.1111/mpp.12857] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Plants are able to effectively cope with invading pathogens by activating an immune response based on the detection of invasion patterns (IPs) originating from the pathogen or released by the plant after infection. At a first level, this perception takes place at the plasma membrane through cell surface immune receptors and although the involvement of proteinaceous pattern recognition receptors (PRRs) is well established, increasing data are also pointing out the role of membrane lipids in the sensing of IPs. In this review, we discuss the evolution of various conceptual models describing plant immunity and present an overview of well-characterized IPs from different natures and origins. We summarize the current knowledge on how they are perceived by plants at the plasma membrane, highlighting the increasingly apparent diversity of sentinel-related systems in plants.
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Affiliation(s)
- Romain Schellenberger
- University of Reims Champagne‐ArdenneRIBP EA 4707, SFR Condorcet FR CNRS 3417Reims51100France
| | - Matthieu Touchard
- University of Reims Champagne‐ArdenneRIBP EA 4707, SFR Condorcet FR CNRS 3417Reims51100France
| | - Christophe Clément
- University of Reims Champagne‐ArdenneRIBP EA 4707, SFR Condorcet FR CNRS 3417Reims51100France
| | - Fabienne Baillieul
- University of Reims Champagne‐ArdenneRIBP EA 4707, SFR Condorcet FR CNRS 3417Reims51100France
| | - Sylvain Cordelier
- University of Reims Champagne‐ArdenneRIBP EA 4707, SFR Condorcet FR CNRS 3417Reims51100France
| | - Jérôme Crouzet
- University of Reims Champagne‐ArdenneRIBP EA 4707, SFR Condorcet FR CNRS 3417Reims51100France
| | - Stéphan Dorey
- University of Reims Champagne‐ArdenneRIBP EA 4707, SFR Condorcet FR CNRS 3417Reims51100France
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89
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Wang Y, Tyler BM, Wang Y. Defense and Counterdefense During Plant-Pathogenic Oomycete Infection. Annu Rev Microbiol 2019; 73:667-696. [DOI: 10.1146/annurev-micro-020518-120022] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Plant-pathogenic oomycetes include numerous species that are ongoing threats to agriculture and natural ecosystems. Understanding the molecular dialogs between oomycetes and plants is instrumental for sustaining effective disease control. Plants respond to oomycete infection by multiple defense actions including strengthening of physical barriers, production of antimicrobial molecules, and programmed cell death. These responses are tightly controlled and integrated via a three-layered immune system consisting of a multiplex recognition layer, a resilient signal-integration layer, and a diverse defense-action layer. Adapted oomycete pathogens utilize apoplastic and intracellular effector arsenals to counter plant immunity mechanisms within each layer, including by evasion or suppression of recognition, interference with numerous signaling components, and neutralization or suppression of defense actions. A coevolutionary arms race continually drives the emergence of new mechanisms of plant defense and oomycete counterdefense.
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Affiliation(s)
- Yan Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China;,
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing 210095, China
| | - Brett M. Tyler
- Center for Genome Research and Biocomputing and Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon 97331, USA
| | - Yuanchao Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China;,
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing 210095, China
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90
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De Vrieze M, Gloor R, Massana Codina J, Torriani S, Gindro K, L'Haridon F, Bailly A, Weisskopf L. Biocontrol Activity of Three Pseudomonas in a Newly Assembled Collection of Phytophthora infestans Isolates. PHYTOPATHOLOGY 2019; 109:1555-1565. [PMID: 31041882 DOI: 10.1094/phyto-12-18-0487-r] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Late blight caused by the oomycete Phytophthora infestans constitutes the greatest threat to potato production worldwide. Considering the increasing concerns regarding the emergence of novel fungicide-resistant genotypes and the general demand for reducing inputs of synthetic and copper-based fungicides, the need for alternative control methods is acute. Several bacterial antagonists have shown anti-Phytophthora effects during in vitro and greenhouse experiments. We report the effects of three Pseudomonas strains recovered from field-grown potatoes against a collection of P. infestans isolates assembled for this study. The collection comprised 19 P. infestans isolates of mating types A1 and A2 greatly varying in fungicide resistance and virulence profiles as deduced from leaf disc experiments on Black's differential set. The mycelial growth of all P. infestans isolates was fully inhibited when co-cultivated with the most active Pseudomonas strain (R47). Moreover, the isolates reacted differently to exposure to the less active Pseudomonas strains (S19 and R76). Leaf disc infection experiments with six selected P. infestans isolates showed that four of them, including highly virulent and fungicide-resistant ones, could be efficiently controlled by different potato-associated Pseudomonas strains.[Formula: see text] Copyright © 2019 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
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Affiliation(s)
- Mout De Vrieze
- Department of Biology, University of Fribourg, Chemin du Musée 10, CH-1700 Fribourg, Switzerland
- Research Division Plant Protection, Agroscope, Route de Duillier 60, CH-1260 Nyon, Switzerland
| | - Ramona Gloor
- Research Division Plant Protection, Agroscope, Route de Duillier 60, CH-1260 Nyon, Switzerland
- Syngenta Crop Protection AG, Schaffhauserstrasse 101, CH-4332 Stein, Switzerland
| | - Josep Massana Codina
- Research Division Plant Protection, Agroscope, Route de Duillier 60, CH-1260 Nyon, Switzerland
| | - Stefano Torriani
- Syngenta Crop Protection AG, Schaffhauserstrasse 101, CH-4332 Stein, Switzerland
| | - Katia Gindro
- Research Division Plant Protection, Agroscope, Route de Duillier 60, CH-1260 Nyon, Switzerland
| | - Floriane L'Haridon
- Department of Biology, University of Fribourg, Chemin du Musée 10, CH-1700 Fribourg, Switzerland
| | - Aurélien Bailly
- Department of Plant and Microbial Biology, University of Zürich, Zollikerstrasse 107, CH-8008 Zurich, Switzerland
| | - Laure Weisskopf
- Department of Biology, University of Fribourg, Chemin du Musée 10, CH-1700 Fribourg, Switzerland
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91
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Wan WL, Fröhlich K, Pruitt RN, Nürnberger T, Zhang L. Plant cell surface immune receptor complex signaling. CURRENT OPINION IN PLANT BIOLOGY 2019; 50:18-28. [PMID: 30878771 DOI: 10.1016/j.pbi.2019.02.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 02/01/2019] [Accepted: 02/07/2019] [Indexed: 05/26/2023]
Abstract
Plant plasma membrane pattern recognition receptors are key to microbe sensing and activation of immunity to microbial invasion. Plants employ several types of such receptors that differ mainly in the structure of their ectodomains and the presence or absence of a cytoplasmic protein kinase domain. Plant immune receptors do not function as single entities, but form larger complexes which undergo compositional changes in a ligand-dependent manner. Here, we highlight current knowledge of molecular mechanisms underlying receptor complex dynamics and regulation, and cover early signaling networks implicated in the activation of generic plant immune responses. We further discuss how an increasingly comprehensive set of immune receptors may be employed to engineer crop plants with enhanced, durable resistance to microbial infection.
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Affiliation(s)
- Wei-Lin Wan
- Department of Plant Biochemistry, Centre for Plant Molecular Biology (ZMBP), Eberhard Karls University Tübingen, Auf der Morgenstelle 32, D-72076 Tübingen, Germany
| | - Katja Fröhlich
- Department of Plant Biochemistry, Centre for Plant Molecular Biology (ZMBP), Eberhard Karls University Tübingen, Auf der Morgenstelle 32, D-72076 Tübingen, Germany
| | - Rory N Pruitt
- Department of Plant Biochemistry, Centre for Plant Molecular Biology (ZMBP), Eberhard Karls University Tübingen, Auf der Morgenstelle 32, D-72076 Tübingen, Germany
| | - Thorsten Nürnberger
- Department of Plant Biochemistry, Centre for Plant Molecular Biology (ZMBP), Eberhard Karls University Tübingen, Auf der Morgenstelle 32, D-72076 Tübingen, Germany; Department of Biochemistry, University of Johannesburg, Auckland Park, South Africa
| | - Lisha Zhang
- Department of Plant Biochemistry, Centre for Plant Molecular Biology (ZMBP), Eberhard Karls University Tübingen, Auf der Morgenstelle 32, D-72076 Tübingen, Germany.
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92
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van der Burgh AM, Joosten MHAJ. Plant Immunity: Thinking Outside and Inside the Box. TRENDS IN PLANT SCIENCE 2019; 24:587-601. [PMID: 31171472 DOI: 10.1016/j.tplants.2019.04.009] [Citation(s) in RCA: 88] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 04/26/2019] [Accepted: 04/26/2019] [Indexed: 05/23/2023]
Abstract
Models are extensively used to describe the coevolution of plants and microbial attackers. Such models distinguish between different classes of plant immune responses, based on the type of danger signal that is recognized or on the strength of the defense response that the danger signal provokes. However, recent molecular and biochemical advances have shown that these dichotomies are blurred. With molecular proof in hand, we propose here to abandon the current classification of plant immune responses, and to define the different forms of plant immunity solely based on the site of microbe recognition - either extracellular or intracellular. Using this spatial partition, our 'spatial immunity model' facilitates a broadly inclusive, but clearly distinguishing nomenclature to describe immune signaling in plant-microbe interactions.
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Affiliation(s)
- Aranka M van der Burgh
- Laboratory of Phytopathology, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Matthieu H A J Joosten
- Laboratory of Phytopathology, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands.
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93
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Fang A, Gao H, Zhang N, Zheng X, Qiu S, Li Y, Zhou S, Cui F, Sun W. A Novel Effector Gene SCRE2 Contributes to Full Virulence of Ustilaginoidea virens to Rice. Front Microbiol 2019; 10:845. [PMID: 31105658 PMCID: PMC6492501 DOI: 10.3389/fmicb.2019.00845] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Accepted: 04/02/2019] [Indexed: 12/13/2022] Open
Abstract
Ustilaginoidea virens, the causal agent of rice false smut (RFS), has become one of the most devastating rice pathogens worldwide. As a group of essential virulence factors, the effectors in the filamentous fungus might play central roles in the interaction between plants and pathogens. However, little is known about the roles of individual effectors in U. virens virulence. In this study, we identified and characterized a small secreted cysteine-rich effector, SCRE2, in U. virens. SCRE2 was first confirmed as an effector through yeast secretion, protein localization and translocation assays, as well as its expression pattern during U. virens infection. Transient expression of SCRE2 in Nicotiana benthamiana suppressed necrosis-like defense symptoms triggered by the mammalian BAX and oomycete elicitin INF1 proteins. The ability of SCRE2 to inhibit immunity-associated responses in N. benthamiana, including elicitor-triggered cell death and oxidative burst, is further defined to a small peptide region SCRE268-85 through expressing a series of truncated proteins. Convincingly, ectopic expression of SCRE2 in the transgenic rice cells significantly inhibited pathogen-associated molecular pattern-triggered immunity including flg22- and chitin-induced defense gene expression and oxidative burst. Furthermore, the scre2 knockout mutant generated by the CRISPR/Cas9 system greatly attenuated in U. virens virulence to rice. Collectively, this study indicates that the effector SCRE2 is able to inhibit plant immunity and is required for full virulence of U. virens.
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Affiliation(s)
- Anfei Fang
- The Ministry of Agriculture Key Laboratory of Pest Monitoring and Green Management, and Joint Laboratory for International Cooperation in Crop Molecular Breeding, Ministry of Education, College of Plant Protection, China Agricultural University, Beijing, China.,College of Plant Protection, Southwest University, Chongqing, China
| | - Han Gao
- The Ministry of Agriculture Key Laboratory of Pest Monitoring and Green Management, and Joint Laboratory for International Cooperation in Crop Molecular Breeding, Ministry of Education, College of Plant Protection, China Agricultural University, Beijing, China
| | - Nan Zhang
- The Ministry of Agriculture Key Laboratory of Pest Monitoring and Green Management, and Joint Laboratory for International Cooperation in Crop Molecular Breeding, Ministry of Education, College of Plant Protection, China Agricultural University, Beijing, China
| | - Xinhang Zheng
- The Ministry of Agriculture Key Laboratory of Pest Monitoring and Green Management, and Joint Laboratory for International Cooperation in Crop Molecular Breeding, Ministry of Education, College of Plant Protection, China Agricultural University, Beijing, China
| | - Shanshan Qiu
- The Ministry of Agriculture Key Laboratory of Pest Monitoring and Green Management, and Joint Laboratory for International Cooperation in Crop Molecular Breeding, Ministry of Education, College of Plant Protection, China Agricultural University, Beijing, China
| | - Yuejiao Li
- The Ministry of Agriculture Key Laboratory of Pest Monitoring and Green Management, and Joint Laboratory for International Cooperation in Crop Molecular Breeding, Ministry of Education, College of Plant Protection, China Agricultural University, Beijing, China
| | - Shuang Zhou
- The Ministry of Agriculture Key Laboratory of Pest Monitoring and Green Management, and Joint Laboratory for International Cooperation in Crop Molecular Breeding, Ministry of Education, College of Plant Protection, China Agricultural University, Beijing, China
| | - Fuhao Cui
- The Ministry of Agriculture Key Laboratory of Pest Monitoring and Green Management, and Joint Laboratory for International Cooperation in Crop Molecular Breeding, Ministry of Education, College of Plant Protection, China Agricultural University, Beijing, China
| | - Wenxian Sun
- The Ministry of Agriculture Key Laboratory of Pest Monitoring and Green Management, and Joint Laboratory for International Cooperation in Crop Molecular Breeding, Ministry of Education, College of Plant Protection, China Agricultural University, Beijing, China.,College of Plant Protection, Jilin Agricultural University, Changchun, China
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94
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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: 48] [Impact Index Per Article: 9.6] [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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95
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Zheng X, Li X, Wang B, Cheng D, Li Y, Li W, Huang M, Tan X, Zhao G, Song B, Macho AP, Chen H, Xie C. A systematic screen of conserved Ralstonia solanacearum effectors reveals the role of RipAB, a nuclear-localized effector that suppresses immune responses in potato. MOLECULAR PLANT PATHOLOGY 2019; 20:547-561. [PMID: 30499228 PMCID: PMC6637881 DOI: 10.1111/mpp.12774] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Both Solanum tuberosum and Ralstonia solanacearum phylotype IIB originated in South America and share a long-term co-evolutionary history. However, our knowledge of potato bacterial wilt pathogenesis is scarce as a result of the technical difficulties of potato plant manipulation. Thus, we established a multiple screening system (virulence screen of effector mutants in potato, growth inhibition of yeast and transient expression in Nicotiana benthamiana) of core type III effectors (T3Es) of a major potato pathovar of phylotype IIB, to provide more research perspectives and biological tools. Using this system, we identified four effectors contributing to virulence during potato infection, with two exhibiting multiple phenotypes in two other systems, including RipAB. Further study showed that RipAB is an unknown protein with a nuclear localization signal (NLS). Furthermore, we generated a ripAB complementation strain and transgenic ripAB-expressing potato plants, and subsequent virulence assays confirmed that R. solanacearum requires RipAB for full virulence. Compared with wild-type potato, transcriptomic analysis of transgenic ripAB-expressing potato plants showed a significant down-regulation of Ca2+ signalling-related genes in the enriched Plant-Pathogen Interaction (PPI) gene ontology (GO) term. We further verified that, during infection, RipAB is required for the down-regulation of four Ca2+ sensors, Stcml5, Stcml23, Stcml-cast and Stcdpk2, and a Ca2+ transporter, Stcngc1. Further evidence showed that the immune-associated reactive oxygen species (ROS) burst is attenuated in ripAB transgenic potato plants. In conclusion, a systematic screen of conserved R. solanacearum effectors revealed an important role for RipAB, which interferes with Ca2+ -dependent gene expression to promote disease development in potato.
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Affiliation(s)
- Xueao Zheng
- Key Laboratory of Potato Biology and Biotechnology, Ministry of Agriculture and Rural AffairsHuazhong Agricultural UniversityWuhan430070China
| | - Xiaojing Li
- Key Laboratory of Potato Biology and Biotechnology, Ministry of Agriculture and Rural AffairsHuazhong Agricultural UniversityWuhan430070China
- Key Laboratory of Plant Resources, Institute of BotanyChinese Academy of SciencesBeijing100093China
| | - Bingsen Wang
- Key Laboratory of Potato Biology and Biotechnology, Ministry of Agriculture and Rural AffairsHuazhong Agricultural UniversityWuhan430070China
| | - Dong Cheng
- Key Laboratory of Potato Biology and Biotechnology, Ministry of Agriculture and Rural AffairsHuazhong Agricultural UniversityWuhan430070China
| | - Yanping Li
- Key Laboratory of Potato Biology and Biotechnology, Ministry of Agriculture and Rural AffairsHuazhong Agricultural UniversityWuhan430070China
| | - Wenhao Li
- Key Laboratory of Potato Biology and Biotechnology, Ministry of Agriculture and Rural AffairsHuazhong Agricultural UniversityWuhan430070China
| | - Mengshu Huang
- Key Laboratory of Potato Biology and Biotechnology, Ministry of Agriculture and Rural AffairsHuazhong Agricultural UniversityWuhan430070China
| | - Xiaodan Tan
- Key Laboratory of Potato Biology and Biotechnology, Ministry of Agriculture and Rural AffairsHuazhong Agricultural UniversityWuhan430070China
| | - Guozhen Zhao
- Key Laboratory of Potato Biology and Biotechnology, Ministry of Agriculture and Rural AffairsHuazhong Agricultural UniversityWuhan430070China
| | - Botao Song
- Key Laboratory of Potato Biology and Biotechnology, Ministry of Agriculture and Rural AffairsHuazhong Agricultural UniversityWuhan430070China
- Key Laboratory of Horticultural Plant Biology, Ministry of EducationHuazhong Agricultural UniversityWuhan430070China
| | - Alberto P. Macho
- Shanghai Center for Plant Stress Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institutes of Biological SciencesChinese Academy of SciencesShanghai201602China
| | - Huilan Chen
- Key Laboratory of Potato Biology and Biotechnology, Ministry of Agriculture and Rural AffairsHuazhong Agricultural UniversityWuhan430070China
| | - Conghua Xie
- Key Laboratory of Potato Biology and Biotechnology, Ministry of Agriculture and Rural AffairsHuazhong Agricultural UniversityWuhan430070China
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Nie J, Yin Z, Li Z, Wu Y, Huang L. A small cysteine-rich protein from two kingdoms of microbes is recognized as a novel pathogen-associated molecular pattern. THE NEW PHYTOLOGIST 2019; 222:995-1011. [PMID: 30537041 DOI: 10.1111/nph.15631] [Citation(s) in RCA: 76] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Accepted: 12/01/2018] [Indexed: 05/24/2023]
Abstract
Pathogen-associated molecular patterns (PAMPs) are conserved molecules that are crucial for normal life cycle of microorganisms. However, the diversity of microbial PAMPs is little known. During screening of cell-death-inducing factors from the necrotrophic fungus Valsa mali, we identified a novel PAMP VmE02 that is widely spread in oomycetes and fungi. Agrobacterium tumefaciens-mediated transient expression or infiltration of recombinant protein produced by Escherichia coli was performed to assay elicitor activity of the proteins tested. Virus-induced gene silencing in Nicotiana benthamiana was used to determine the components involved in VmE02-triggered cell death. The role of VmE02 in virulence and conidiation of V. mali were characterized by gene deletion and complementation. We found that VmE02, together with some of its homologues from both oomycete and fungal species, exhibited cell-death-inducing activity in N. benthamiana. VmE02-triggered cell death was shown to be dependent on BRI1-ASSOCIATED KINASE-1, SUPPRESSOR OF BIR1-1, HSP90 and SGT1 in N. benthamiana. Deletion of VmE02 in V. mali greatly attenuated pathogen conidiation but not virulence, and treatment of N. benthamiana with VmE02 enhances plant resistance to Sclerotinia sclerotiorum and Phytophthora capsici. We conclude that VmE02 is a novel cross-kingdom PAMP produced by several fungi and oomycetes.
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Affiliation(s)
- Jiajun Nie
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Zhiyuan Yin
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Zhengpeng Li
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Yuxing Wu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Lili Huang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
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97
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Wang W, Deng Z, Wu H, Zhao Q, Li T, Zhu W, Wang X, Tang L, Wang C, Cui SZ, Xiao H, Chen J. A small secreted protein triggers a TLR2/4-dependent inflammatory response during invasive Candida albicans infection. Nat Commun 2019; 10:1015. [PMID: 30833559 PMCID: PMC6399272 DOI: 10.1038/s41467-019-08950-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Accepted: 01/17/2019] [Indexed: 11/09/2022] Open
Abstract
Candida albicans can switch from commensal to pathogenic mode, causing mucosal or disseminated candidiasis. The host relies on pattern-recognition receptors including Toll-like receptors (TLRs) and C-type lectin receptors (CLRs) to sense invading fungal pathogens and launch immune defense mechanisms. However, the complex interplay between fungus and host innate immunity remains incompletely understood. Here we report that C. albicans upregulates expression of a small secreted cysteine-rich protein Sel1 upon encountering limited nitrogen and abundant serum. Sel1 activates NF-κB and MAPK signaling pathways, leading to expression of proinflammatory cytokines and chemokines. Comprehensive genetic and biochemical analyses reveal both TLR2 and TLR4 are required for the recognition of Sel1. Further, SEL1-deficient C. albicans display an impaired immune response in vivo, causing increased morbidity and mortality in a bloodstream infection model. We identify a critical component in the Candida-host interaction that opens a new avenue to tackle Candida infection and inflammation.
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Affiliation(s)
- Wenjuan Wang
- State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 320 Yue Yang Road, Shanghai, 200031, China
| | - Zihou Deng
- CAS Key Laboratory of Molecular Virology & Immunology, Institut Pasteur of Shanghai, CAS Center for Excellence in Molecular Cell Science, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 320 Yue Yang Road, Shanghai, 200031, China
| | - Hongyu Wu
- State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 320 Yue Yang Road, Shanghai, 200031, China
| | - Qun Zhao
- State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 320 Yue Yang Road, Shanghai, 200031, China
| | - Tiantian Li
- CAS Key Laboratory of Molecular Virology & Immunology, Institut Pasteur of Shanghai, CAS Center for Excellence in Molecular Cell Science, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 320 Yue Yang Road, Shanghai, 200031, China
| | - Wencheng Zhu
- State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 320 Yue Yang Road, Shanghai, 200031, China
| | - Xiongjun Wang
- State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 320 Yue Yang Road, Shanghai, 200031, China
| | - Longhai Tang
- Suzhou Blood Center, Suzhou, Jiangsu, 215000, China
| | - Chengshu Wang
- CAS Key Laboratory of Insect Developmental and Evolutionary Biology, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, 200032, China
| | - Shu-Zhong Cui
- State Key Laboratory of Respiratory Diseases, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, Guangdong, 510095, China
| | - Hui Xiao
- CAS Key Laboratory of Molecular Virology & Immunology, Institut Pasteur of Shanghai, CAS Center for Excellence in Molecular Cell Science, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 320 Yue Yang Road, Shanghai, 200031, China.
| | - Jiangye Chen
- State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 320 Yue Yang Road, Shanghai, 200031, China.
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98
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Starý T, Satková P, Piterková J, Mieslerová B, Luhová L, Mikulík J, Kašparovský T, Petřivalský M, Lochman J. The elicitin β-cryptogein's activity in tomato is mediated by jasmonic acid and ethylene signalling pathways independently of elicitin-sterol interactions. PLANTA 2019; 249:739-749. [PMID: 30374914 DOI: 10.1007/s00425-018-3036-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 10/24/2018] [Indexed: 06/08/2023]
Abstract
The level of resistance induced in different tomato genotypes after β-CRY treatment correlated with the upregulation of defence genes, but not sterol binding and involved ethylene and jasmonic acid signalling. Elicitins, a family of small proteins secreted by Phytophthora and Pythium spp., are the most well-known microbe-associated molecular patterns of oomycetes, a lineage of fungus-like organisms that include many economically significant crop pathogens. The responses of tomato plants to elicitin INF1 produced by Phytophthora infestans have been studied extensively. Here, we present studies on the responses of three tomato genotypes to β-cryptogein (β-CRY), a potent elicitin secreted by Phytophthora cryptogea that induces hypersensitive response (HR) cell death in tobacco plants and confers greater resistance to oomycete infection than acidic elicitins like INF1. We also studied β-CRY mutants impaired in sterol binding (Val84Phe) and interaction with the binding site on tobacco plasma membrane (Leu41Phe), because sterol binding was suggested to be important in INF1-induced resistance. Treatment with β-CRY or the Val84Phe mutant induced resistance to powdery mildew caused by the pathogen Pseudoidium neolycopersici, but not the HR cell death observed in tobacco and potato plants. The level of resistance induced in different tomato genotypes correlated with the upregulation of defence genes including defensins, β-1,3-glucanases, heveins, chitinases, osmotins, and PR1 proteins. Treatment with the Leu41Phe mutant did not induce this upregulation, suggesting similar elicitin recognition in tomato and tobacco. However, here β-CRY activated ethylene and jasmonic acid signalling, but not salicylic acid signalling, demonstrating that elicitins activate different downstream signalling processes in different plant species. This could potentially be exploited to enhance the resistance of Phytophthora-susceptible crops.
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Affiliation(s)
- Tomáš Starý
- Department of Biochemistry, Faculty of Science, Masaryk University, Kotlářská 2, 61137, Brno, Czech Republic
| | - Pavla Satková
- Department of Biochemistry, Faculty of Science, Palacký University, Šlechtitelů 27, 78371, Olomouc, Czech Republic
| | - Jana Piterková
- Department of Biochemistry, Faculty of Science, Palacký University, Šlechtitelů 27, 78371, Olomouc, Czech Republic
| | - Barbora Mieslerová
- Department of Botany, Faculty of Science, Palacký University, Šlechtitelů 27, 78371, Olomouc, Czech Republic
| | - Lenka Luhová
- Department of Biochemistry, Faculty of Science, Palacký University, Šlechtitelů 27, 78371, Olomouc, Czech Republic
| | - Jaromír Mikulík
- Laboratory of Growth Regulators, Department of Chemical Biology and Genetics, Centre of the Region Haná for Biotechnological and Agricultural Research, Faculty of Science, Institute of Experimental Botany ASCR, Palacký University, Šlechtitelů 27, 78371, Olomouc, Czech Republic
| | - Tomáš Kašparovský
- Department of Biochemistry, Faculty of Science, Masaryk University, Kotlářská 2, 61137, Brno, Czech Republic
| | - Marek Petřivalský
- Department of Biochemistry, Faculty of Science, Palacký University, Šlechtitelů 27, 78371, Olomouc, Czech Republic
| | - Jan Lochman
- Department of Biochemistry, Faculty of Science, Masaryk University, Kotlářská 2, 61137, Brno, Czech Republic.
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99
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Pfeilmeier S, George J, Morel A, Roy S, Smoker M, Stransfeld L, Downie JA, Peeters N, Malone JG, Zipfel C. Expression of the Arabidopsis thaliana immune receptor EFR in Medicago truncatula reduces infection by a root pathogenic bacterium, but not nitrogen-fixing rhizobial symbiosis. PLANT BIOTECHNOLOGY JOURNAL 2019; 17:569-579. [PMID: 30120864 PMCID: PMC6381793 DOI: 10.1111/pbi.12999] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 07/11/2018] [Accepted: 08/13/2018] [Indexed: 05/12/2023]
Abstract
Interfamily transfer of plant pattern recognition receptors (PRRs) represents a promising biotechnological approach to engineer broad-spectrum, and potentially durable, disease resistance in crops. It is however unclear whether new recognition specificities to given pathogen-associated molecular patterns (PAMPs) affect the interaction of the recipient plant with beneficial microbes. To test this in a direct reductionist approach, we transferred the Brassicaceae-specific PRR ELONGATION FACTOR-THERMO UNSTABLE RECEPTOR (EFR), conferring recognition of the bacterial EF-Tu protein, from Arabidopsis thaliana to the legume Medicago truncatula. Constitutive EFR expression led to EFR accumulation and activation of immune responses upon treatment with the EF-Tu-derived elf18 peptide in leaves and roots. The interaction of M. truncatula with the bacterial symbiont Sinorhizobium meliloti is characterized by the formation of root nodules that fix atmospheric nitrogen. Although nodule numbers were slightly reduced at an early stage of the infection in EFR-Medicago when compared to control lines, nodulation was similar in all lines at later stages. Furthermore, nodule colonization by rhizobia, and nitrogen fixation were not compromised by EFR expression. Importantly, the M. truncatula lines expressing EFR were substantially more resistant to the root bacterial pathogen Ralstonia solanacearum. Our data suggest that the transfer of EFR to M. truncatula does not impede root nodule symbiosis, but has a positive impact on disease resistance against a bacterial pathogen. In addition, our results indicate that Rhizobium can either avoid PAMP recognition during the infection process, or is able to actively suppress immune signaling.
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Affiliation(s)
- Sebastian Pfeilmeier
- The Sainsbury LaboratoryNorwich Research ParkNorwichUK
- John Innes CentreNorwich Research ParkNorwichUK
- Present address:
Institute of MicrobiologyDepartment of BiologyETH ZurichZurich8093Switzerland
| | | | - Arry Morel
- INRALaboratoire des Interactions Plantes Micro‐organismes (LIPM)UMR441Castanet‐TolosanFrance
- CNRSLaboratoire des Interactions Plantes Micro‐organismes (LIPM)UMR2594Castanet‐TolosanFrance
| | - Sonali Roy
- John Innes CentreNorwich Research ParkNorwichUK
- Present address:
Noble Research InstituteArdmoreOKUSA
| | | | - Lena Stransfeld
- The Sainsbury LaboratoryNorwich Research ParkNorwichUK
- Institute of Plant and Microbial Biology & Zurich‐Basel Plant Science CenterUniversity of ZurichZurichSwitzerland
| | | | - Nemo Peeters
- INRALaboratoire des Interactions Plantes Micro‐organismes (LIPM)UMR441Castanet‐TolosanFrance
- CNRSLaboratoire des Interactions Plantes Micro‐organismes (LIPM)UMR2594Castanet‐TolosanFrance
| | - Jacob G. Malone
- John Innes CentreNorwich Research ParkNorwichUK
- School of Biological SciencesUniversity of East AngliaNorwichUK
| | - Cyril Zipfel
- The Sainsbury LaboratoryNorwich Research ParkNorwichUK
- Institute of Plant and Microbial Biology & Zurich‐Basel Plant Science CenterUniversity of ZurichZurichSwitzerland
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100
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Hassing B, Winter D, Becker Y, Mesarich CH, Eaton CJ, Scott B. Analysis of Epichloë festucae small secreted proteins in the interaction with Lolium perenne. PLoS One 2019; 14:e0209463. [PMID: 30759164 PMCID: PMC6374014 DOI: 10.1371/journal.pone.0209463] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2018] [Accepted: 01/25/2019] [Indexed: 12/27/2022] Open
Abstract
Epichloë festucae is an endophyte of the agriculturally important perennial ryegrass. This species systemically colonises the aerial tissues of this host where its growth is tightly regulated thereby maintaining a mutualistic symbiotic interaction. Recent studies have suggested that small secreted proteins, termed effectors, play a vital role in the suppression of host defence responses. To date only a few effectors with important roles in mutualistic interactions have been described. Here we make use of the fully assembled E. festucae genome and EffectorP to generate a suite of 141 effector candidates. These were analysed with respect to their genome location and expression profiles in planta and in several symbiosis-defective mutants. We found an association between effector candidates and a class of transposable elements known as MITEs, but no correlation with other dynamic features of the E. festucae genome, such as transposable element-rich regions. Three effector candidates and a small GPI-anchored protein were chosen for functional analysis based on their high expression in planta compared to in culture and their differential regulation in symbiosis defective E. festucae mutants. All three candidate effector proteins were shown to possess a functional signal peptide and two could be detected in the extracellular medium by western blotting. Localization of the effector candidates in planta suggests that they are not translocated into the plant cell, but rather, are localized in the apoplastic space or are attached to the cell wall. Deletion and overexpression of the effector candidates, as well as the putative GPI-anchored protein, did not affect the plant growth phenotype or restrict growth of E. festucae mutants in planta. These results indicate that these proteins are either not required for the interaction at the observed life stages or that there is redundancy between effectors expressed by E. festucae.
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Affiliation(s)
- Berit Hassing
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand
- Bio-Protection Research Centre, Massey University, Palmerston North, New Zealand
| | - David Winter
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand
- Bio-Protection Research Centre, Massey University, Palmerston North, New Zealand
| | - Yvonne Becker
- Institute for Epidemiology and Pathogen Diagnostics, Julius Küehn-Institute, Federal Research Centre for Cultivated Plants, Braunschweig, Germany
| | - Carl H. Mesarich
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand
- School of Agriculture and Environment, Massey University, Palmerston North, New Zealand
| | - Carla J. Eaton
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand
- Bio-Protection Research Centre, Massey University, Palmerston North, New Zealand
| | - Barry Scott
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand
- Bio-Protection Research Centre, Massey University, Palmerston North, New Zealand
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