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Hasegawa K, Timmers T, Chai J, Maekawa T. A disease resistance assay in Nicotiana benthamiana reveals the immune function of Response to HopBA1. PLANT PHYSIOLOGY 2024; 196:722-725. [PMID: 38976586 PMCID: PMC11444287 DOI: 10.1093/plphys/kiae368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Revised: 06/12/2024] [Accepted: 06/13/2024] [Indexed: 07/10/2024]
Abstract
A receptor protein variant lacking 2′,3′-cAMP/cGMP synthetase activity but retaining NADase activity does not induce cell death but confers resistance to Potato virus X.
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Affiliation(s)
- Keiichi Hasegawa
- Institute for Biochemistry, University of Cologne, 50674 Cologne, Germany
| | - Ton Timmers
- Central Microscopy, CEMIC, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
| | - Jijie Chai
- Institute for Biochemistry, University of Cologne, 50674 Cologne, Germany
- Cluster of Excellence on Plant Sciences (CEPLAS), Cologne, Germany
| | - Takaki Maekawa
- Cluster of Excellence on Plant Sciences (CEPLAS), Cologne, Germany
- Institute for Plant Sciences, University of Cologne, 50674 Cologne, Germany
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2
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Ros-Moner E, Jiménez-Góngora T, Villar-Martín L, Vogrinec L, González-Miguel VM, Kutnjak D, Rubio-Somoza I. Conservation of molecular responses upon viral infection in the non-vascular plant Marchantia polymorpha. Nat Commun 2024; 15:8326. [PMID: 39333479 PMCID: PMC11436993 DOI: 10.1038/s41467-024-52610-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Accepted: 09/12/2024] [Indexed: 09/29/2024] Open
Abstract
After plants transitioned from water to land around 450 million years ago, they faced novel pathogenic microbes. Their colonization of diverse habitats was driven by anatomical innovations like roots, stomata, and vascular tissue, which became central to plant-microbe interactions. However, the impact of these innovations on plant immunity and pathogen infection strategies remains poorly understood. Here, we explore plant-virus interactions in the bryophyte Marchantia polymorpha to gain insights into the evolution of these relationships. Virome analysis reveals that Marchantia is predominantly associated with RNA viruses. Comparative studies with tobacco mosaic virus (TMV) show that Marchantia shares core defense responses with vascular plants but also exhibits unique features, such as a sustained wound response preventing viral spread. Additionally, general defense responses in Marchantia are equivalent to those restricted to vascular tissues in Nicotiana, suggesting that evolutionary acquisition of developmental innovations results in re-routing of defense responses in vascular plants.
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Affiliation(s)
- Eric Ros-Moner
- Molecular Reprogramming and Evolution (MoRE) Laboratory, Centre for Research in Agricultural Genomics (CRAG), CSIC-IRTA-UAB-UB, Campus UAB-Edifci CRAG, Cerdanyola del Vallés, Spain
| | - Tamara Jiménez-Góngora
- Molecular Reprogramming and Evolution (MoRE) Laboratory, Centre for Research in Agricultural Genomics (CRAG), CSIC-IRTA-UAB-UB, Campus UAB-Edifci CRAG, Cerdanyola del Vallés, Spain
| | - Luis Villar-Martín
- Molecular Reprogramming and Evolution (MoRE) Laboratory, Centre for Research in Agricultural Genomics (CRAG), CSIC-IRTA-UAB-UB, Campus UAB-Edifci CRAG, Cerdanyola del Vallés, Spain
| | - Lana Vogrinec
- Department of Biotechnology and Systems Biology, National Institute of Biology, Ljubljana, Slovenia
- Jožef Stefan International Postgraduate School, Ljubljana, Slovenia
| | - Víctor M González-Miguel
- Data Analysis area, Bioinformatics Core Unit, Centre for Research in Agricultural Genomics (CRAG), CSIC-IRTA-UAB-UB, Campus UAB-Edifci CRAG, Cerdanyola del Vallés, Spain
| | - Denis Kutnjak
- Department of Biotechnology and Systems Biology, National Institute of Biology, Ljubljana, Slovenia
| | - Ignacio Rubio-Somoza
- Molecular Reprogramming and Evolution (MoRE) Laboratory, Centre for Research in Agricultural Genomics (CRAG), CSIC-IRTA-UAB-UB, Campus UAB-Edifci CRAG, Cerdanyola del Vallés, Spain.
- Consejo Superior de Investigaciones Científicas (CSIC), Barcelona, Spain.
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3
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Kumakura N, Singkaravanit-Ogawa S, Gan P, Tsushima A, Ishihama N, Watanabe S, Seo M, Iwasaki S, Narusaka M, Narusaka Y, Takano Y, Shirasu K. Guanosine-specific single-stranded ribonuclease effectors of a phytopathogenic fungus potentiate host immune responses. THE NEW PHYTOLOGIST 2024; 242:170-191. [PMID: 38348532 DOI: 10.1111/nph.19582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 01/06/2024] [Indexed: 03/08/2024]
Abstract
Plants activate immunity upon recognition of pathogen-associated molecular patterns. Although phytopathogens have evolved a set of effector proteins to counteract plant immunity, some effectors are perceived by hosts and induce immune responses. Here, we show that two secreted ribonuclease effectors, SRN1 and SRN2, encoded in a phytopathogenic fungus, Colletotrichum orbiculare, induce cell death in a signal peptide- and catalytic residue-dependent manner, when transiently expressed in Nicotiana benthamiana. The pervasive presence of SRN genes across Colletotrichum species suggested the conserved roles. Using a transient gene expression system in cucumber (Cucumis sativus), an original host of C. orbiculare, we show that SRN1 and SRN2 potentiate host pattern-triggered immunity responses. Consistent with this, C. orbiculare SRN1 and SRN2 deletion mutants exhibited increased virulence on the host. In vitro analysis revealed that SRN1 specifically cleaves single-stranded RNAs at guanosine, leaving a 3'-end phosphate. Importantly, the potentiation of C. sativus responses by SRN1 and SRN2, present in the apoplast, depends on ribonuclease catalytic residues. We propose that the pathogen-derived apoplastic guanosine-specific single-stranded endoribonucleases lead to immunity potentiation in plants.
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Affiliation(s)
- Naoyoshi Kumakura
- RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, 230-0045, Japan
| | | | - Pamela Gan
- RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, 230-0045, Japan
| | - Ayako Tsushima
- RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, 230-0045, Japan
- Graduate School of Science, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Nobuaki Ishihama
- RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, 230-0045, Japan
| | - Shunsuke Watanabe
- RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, 230-0045, Japan
| | - Mitsunori Seo
- RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, 230-0045, Japan
- Tropical Biosphere Research Center, University of the Ryukyus, Nakagami, Okinawa, 903-0213, Japan
| | - Shintaro Iwasaki
- RIKEN Cluster for Pioneering Research, Wako, Saitama, 351-0198, Japan
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba, 277-8561, Japan
| | - Mari Narusaka
- Okayama Prefectural Technology Center for Agriculture, Forestry, and Fisheries, Research Institute for Biological Sciences, Kaga, Okayama, 716-1241, Japan
| | - Yoshihiro Narusaka
- Okayama Prefectural Technology Center for Agriculture, Forestry, and Fisheries, Research Institute for Biological Sciences, Kaga, Okayama, 716-1241, Japan
| | - Yoshitaka Takano
- Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan
| | - Ken Shirasu
- RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, 230-0045, Japan
- Graduate School of Science, The University of Tokyo, Tokyo, 113-0033, Japan
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4
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Zheng X, Li Y, Liu Y. Plant Immunity against Tobamoviruses. Viruses 2024; 16:530. [PMID: 38675873 PMCID: PMC11054417 DOI: 10.3390/v16040530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 03/26/2024] [Accepted: 03/27/2024] [Indexed: 04/28/2024] Open
Abstract
Tobamoviruses are a group of plant viruses that pose a significant threat to agricultural crops worldwide. In this review, we focus on plant immunity against tobamoviruses, including pattern-triggered immunity (PTI), effector-triggered immunity (ETI), the RNA-targeting pathway, phytohormones, reactive oxygen species (ROS), and autophagy. Further, we highlight the genetic resources for resistance against tobamoviruses in plant breeding and discuss future directions on plant protection against tobamoviruses.
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Affiliation(s)
- Xiyin Zheng
- MOE Key Laboratory of Bioinformatics and Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China
- Tsinghua-Peking Center for Life Sciences, Beijing 100084, China
| | - Yiqing Li
- MOE Key Laboratory of Bioinformatics and Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China
- Tsinghua-Peking Center for Life Sciences, Beijing 100084, China
| | - Yule Liu
- MOE Key Laboratory of Bioinformatics and Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China
- Tsinghua-Peking Center for Life Sciences, Beijing 100084, China
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5
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Palukaitis P, Yoon JY. Defense signaling pathways in resistance to plant viruses: Crosstalk and finger pointing. Adv Virus Res 2024; 118:77-212. [PMID: 38461031 DOI: 10.1016/bs.aivir.2024.01.002] [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: 03/11/2024]
Abstract
Resistance to infection by plant viruses involves proteins encoded by plant resistance (R) genes, viz., nucleotide-binding leucine-rich repeats (NLRs), immune receptors. These sensor NLRs are activated either directly or indirectly by viral protein effectors, in effector-triggered immunity, leading to induction of defense signaling pathways, resulting in the synthesis of numerous downstream plant effector molecules that inhibit different stages of the infection cycle, as well as the induction of cell death responses mediated by helper NLRs. Early events in this process involve recognition of the activation of the R gene response by various chaperones and the transport of these complexes to the sites of subsequent events. These events include activation of several kinase cascade pathways, and the syntheses of two master transcriptional regulators, EDS1 and NPR1, as well as the phytohormones salicylic acid, jasmonic acid, and ethylene. The phytohormones, which transit from a primed, resting states to active states, regulate the remainder of the defense signaling pathways, both directly and by crosstalk with each other. This regulation results in the turnover of various suppressors of downstream events and the synthesis of various transcription factors that cooperate and/or compete to induce or suppress transcription of either other regulatory proteins, or plant effector molecules. This network of interactions results in the production of defense effectors acting alone or together with cell death in the infected region, with or without the further activation of non-specific, long-distance resistance. Here, we review the current state of knowledge regarding these processes and the components of the local responses, their interactions, regulation, and crosstalk.
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Affiliation(s)
- Peter Palukaitis
- Graduate School of Plant Protection and Quarantine, Jeonbuk National University, Jeonju, Jeollabuk-do, Republic of Korea.
| | - Ju-Yeon Yoon
- Graduate School of Plant Protection and Quarantine, Jeonbuk National University, Jeonju, Jeollabuk-do, Republic of Korea.
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6
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Meier ND, Seward K, Caplan JL, Dinesh-Kumar SP. Calponin homology domain containing kinesin, KIS1, regulates chloroplast stromule formation and immunity. SCIENCE ADVANCES 2023; 9:eadi7407. [PMID: 37878708 PMCID: PMC10599616 DOI: 10.1126/sciadv.adi7407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Accepted: 09/25/2023] [Indexed: 10/27/2023]
Abstract
Chloroplast morphology changes during immunity, giving rise to tubule-like structures known as stromules. Stromules extend along microtubules and anchor to actin filaments along nuclei to promote perinuclear chloroplast clustering. This facilitates the transport of defense molecules/proteins from chloroplasts to the nucleus. Evidence for a direct role for stromules in immunity is lacking since, currently, there are no known genes that regulate stromule biogenesis. We show that a calponin homology (CH) domain containing kinesin, KIS1 (kinesin required for inducing stromules 1), is required for stromule formation during TNL [TIR (Toll/Interleukin-1 receptor)-type nucleotide-binding leucine-rich repeat]-immune receptor-mediated immunity. Furthermore, KIS1 is required for TNL-mediated immunity to bacterial and viral pathogens. The microtubule-binding motor domain of KIS1 is required for stromule formation while the actin-binding, CH domain is required for perinuclear chloroplast clustering. We show that KIS1 functions through early immune signaling components, EDS1 and PAD4, with salicylic acid-induced stromules requiring KIS1. Thus, KIS1 represents a player in stromule biogenesis.
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Affiliation(s)
- Nathan D. Meier
- Department of Plant Biology and The Genome Center, College of Biological Sciences, University of California, Davis, CA 95616, USA
| | - Kody Seward
- Department of Biological Sciences, College of Arts and Sciences, University of Delaware, Newark, DE 19716, USA
- Delaware Biotechnology Institute, University of Delaware, Newark, DE 19713, USA
| | - Jeffrey L. Caplan
- Department of Biological Sciences, College of Arts and Sciences, University of Delaware, Newark, DE 19716, USA
- Delaware Biotechnology Institute, University of Delaware, Newark, DE 19713, USA
- Department of Plant and Soil Sciences, College of Agriculture and Natural Resources, University of Delaware, Newark, DE 19716, USA
| | - Savithramma P. Dinesh-Kumar
- Department of Plant Biology and The Genome Center, College of Biological Sciences, University of California, Davis, CA 95616, USA
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7
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Eid MA, Momeh GN, El-Shanshoury AERR, Allam NG, Gaafar RM. Comprehensive analysis of soybean cultivars' response to SMV infection: genotypic association, molecular characterization, and defense gene expressions. J Genet Eng Biotechnol 2023; 21:102. [PMID: 37847328 PMCID: PMC10581962 DOI: 10.1186/s43141-023-00558-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Accepted: 10/08/2023] [Indexed: 10/18/2023]
Abstract
BACKGROUND Soybean mosaic virus (SMV) is a devastating disease that threatens soybean plants worldwide. The different soybean genotypes displayed different responses to SMV strains. This study aimed to investigate the response of different selected soybean cultivars to SMV infection in Egypt based on their specific genetic makeup. RESULT The symptoms of SMV infection and the viral concentration were evaluated in eight soybean cultivars (Giza 21, Giza 22, Giza 35, Giza 82, Giza 111, Crawford, H4L4, and PI416937) using ELISA assay. The results indicated that Giza 21 and Giza 35 were moderately tolerant to SMV infection, while Giza 82 was the least tolerant cultivar. Giza 22, Giza 111, and PI416937 were less tolerant; however, H4L4 and Crawford were identified as the most tolerant cultivars against SMV infection. The chi-square analysis showed a significant association between the different selected cultivars and their response against SMV infection. The PCR test showed the presence of RSV1 (3gG2), RSV1 (5gG3), and RSV3 loci, and the absence of the RSV4 locus gene. The expression analysis of the selected defense genes (EDS1, PAD4, EDR1, ERF1, and JAR) showed variations in the fold changes between infected and non-infected soybean cultivars, suggesting that these genes might play a crucial role in this pathosystem. Additionally, there was a strong positive association between the expression levels of EDR1 and ERF1. CONCLUSION The study found the presence of RSV1 (3gG2), RSV1 (5gG3), and RSV3 loci in selected soybean cultivars, but not RSV4. The analysis of gene expression indicated that certain defense genes may play a vital role in the pathosystem. This research is the first of its kind in Egypt to genotype soybean cultivars regarding different RSV loci. The findings could be beneficial for further research on understanding the molecular mechanisms involved in SMV infection and its management.
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Affiliation(s)
- Mohammed A Eid
- Botany and Microbiology Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt.
| | - Gehan N Momeh
- Botany and Microbiology Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt
| | | | - Nanis G Allam
- Botany and Microbiology Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt
| | - Reda M Gaafar
- Botany and Microbiology Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt
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8
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Spiegelman Z, Dinesh-Kumar SP. Breaking Boundaries: The Perpetual Interplay Between Tobamoviruses and Plant Immunity. Annu Rev Virol 2023; 10:455-476. [PMID: 37254097 DOI: 10.1146/annurev-virology-111821-122847] [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: 06/01/2023]
Abstract
Plant viruses of the genus Tobamovirus cause significant economic losses in various crops. The emergence of new tobamoviruses such as the tomato brown rugose fruit virus (ToBRFV) poses a major threat to global agriculture. Upon infection, plants mount a complex immune response to restrict virus replication and spread, involving a multilayered defense system that includes defense hormones, RNA silencing, and immune receptors. To counter these defenses, tobamoviruses have evolved various strategies to evade or suppress the different immune pathways. Understanding the interactions between tobamoviruses and the plant immune pathways is crucial for the development of effective control measures and genetic resistance to these viruses. In this review, we discuss past and current knowledge of the intricate relationship between tobamoviruses and host immunity. We use this knowledge to understand the emergence of ToBRFV and discuss potential approaches for the development of new resistance strategies to cope with emerging tobamoviruses.
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Affiliation(s)
- Ziv Spiegelman
- Department of Plant Pathology and Weed Research, Agricultural Research Organization-The Volcani Institute, Rishon LeZion, Israel;
| | - Savithramma P Dinesh-Kumar
- Department of Plant Biology and Genome Center, College of Biological Sciences, University of California, Davis, California, USA
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9
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Liu F, Zeng M, Sun Y, Chen Z, Chen Z, Wang L, Cui JR, Zhang F, Lv D, Chen X, Xu Y, Duan KX, Wang Y, Wang Y. BAK1 protects the receptor-like kinase BIR2 from SNIPER2a/b-mediated degradation to promote pattern-triggered immunity in Nicotiana benthamiana. THE PLANT CELL 2023; 35:3566-3584. [PMID: 37378590 PMCID: PMC10473216 DOI: 10.1093/plcell/koad187] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 05/16/2023] [Accepted: 06/01/2023] [Indexed: 06/29/2023]
Abstract
The detection of microbial infections by plants induces the rapid formation of immune receptor complexes at the plasma membrane. However, how this process is controlled to ensure proper immune signaling remains largely unknown. Here, we found that the Nicotiana benthamiana membrane-localized leucine-rich repeat receptor-like kinase BAK1-INTERACTING RLK 2 (NbBIR2) constitutively associates with BRI1-ASSOCIATED RECEPTOR KINASE 1 (NbBAK1) in vivo and in vitro and promotes complex formation with pattern recognition receptors. In addition, NbBIR2 is targeted by 2 RING-type ubiquitin E3 ligases, SNC1-INFLUENCING PLANT E3 LIGASE REVERSE 2a (NbSNIPER2a) and NbSNIPER2b, for ubiquitination and subsequent degradation in planta. NbSNIPER2a and NbSNIPER2b interact with NbBIR2 in vivo and in vitro and are released from NbBIR2 upon treatment with different microbial patterns. Furthermore, accumulation of NbBIR2 in response to microbial patterns is tightly associated with NbBAK1 abundance in N. benthamiana. NbBAK1 acts as a modular protein that stabilizes NbBIR2 by competing with NbSNIPER2a or NbSNIPER2b for association with NbBIR2. Similar to NbBAK1, NbBIR2 positively regulates pattern-triggered immunity and resistance to bacterial and oomycete pathogens in N. benthamiana, whereas NbSNIPER2a and NbSNIPER2b have the opposite effect. Together, these results reveal a feedback regulatory mechanism employed by plants to tailor pattern-triggered immune signaling.
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Affiliation(s)
- Fan Liu
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Soybean Disease and Pest Control (Ministry of Agriculture and Rural Affairs), Nanjing Agricultural University, Nanjing 210095, China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Mengzhu Zeng
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Soybean Disease and Pest Control (Ministry of Agriculture and Rural Affairs), Nanjing Agricultural University, Nanjing 210095, China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Yujing Sun
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Soybean Disease and Pest Control (Ministry of Agriculture and Rural Affairs), Nanjing Agricultural University, Nanjing 210095, China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Zhiyuan Chen
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Soybean Disease and Pest Control (Ministry of Agriculture and Rural Affairs), Nanjing Agricultural University, Nanjing 210095, China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Zhaodan Chen
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Soybean Disease and Pest Control (Ministry of Agriculture and Rural Affairs), Nanjing Agricultural University, Nanjing 210095, China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Lei Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Soybean Disease and Pest Control (Ministry of Agriculture and Rural Affairs), Nanjing Agricultural University, Nanjing 210095, China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Jia-Rong Cui
- Department of Entomology, Nanjing Agricultural University, Nanjing 210095, China
| | - Fushuang Zhang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Soybean Disease and Pest Control (Ministry of Agriculture and Rural Affairs), Nanjing Agricultural University, Nanjing 210095, China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Di Lv
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Soybean Disease and Pest Control (Ministry of Agriculture and Rural Affairs), Nanjing Agricultural University, Nanjing 210095, China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Xue Chen
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Soybean Disease and Pest Control (Ministry of Agriculture and Rural Affairs), Nanjing Agricultural University, Nanjing 210095, China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Yuanpeng Xu
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Soybean Disease and Pest Control (Ministry of Agriculture and Rural Affairs), Nanjing Agricultural University, Nanjing 210095, China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Kai-Xuan Duan
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Soybean Disease and Pest Control (Ministry of Agriculture and Rural Affairs), Nanjing Agricultural University, Nanjing 210095, China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Yan Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Soybean Disease and Pest Control (Ministry of Agriculture and Rural Affairs), Nanjing Agricultural University, Nanjing 210095, China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Yuanchao Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China
- Key Laboratory of Soybean Disease and Pest Control (Ministry of Agriculture and Rural Affairs), Nanjing Agricultural University, Nanjing 210095, China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
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10
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Liao M, Ma Z, Kang Y, Zhang B, Gao X, Yu F, Yang P, Ke Y. ENHANCED DISEASE SUSCEPTIBILITY 1 promotes hydrogen peroxide scavenging to enhance rice thermotolerance. PLANT PHYSIOLOGY 2023:kiad257. [PMID: 37099454 PMCID: PMC10400032 DOI: 10.1093/plphys/kiad257] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 03/30/2023] [Accepted: 04/25/2023] [Indexed: 06/19/2023]
Abstract
Heat stress is a major factor limiting the production and geographic distribution of rice (Oryza sativa), and breeding rice varieties with tolerance to heat stress is of immense importance. Although extensive studies have revealed that reactive oxygen species (ROS) play a critical role in rice acclimation to heat stress, the molecular basis of rice controlling ROS homeostasis remains largely unclear. In this study, we discovered a novel heat stress-responsive strategy that orchestrates ROS homeostasis centering on an immune activator, rice ENHANCED DISEASE SUSCEPTIBILITY 1 (OsEDS1). OsEDS1, which confers heat stress tolerance, promotes hydrogen peroxide (H2O2) scavenging by stimulating catalase activity through the OsEDS1-catalase association. The loss-of-function mutation in OsEDS1 causes increased sensitivity to heat stress, whereas overexpression of OsEDS1 enhances thermotolerance. Furthermore, overexpression lines greatly improved rice tolerance to heat stress during the reproductive stage, which was associated with substantially increased seed setting, grain weight, and plant yield. Rice CATALASE C (OsCATC), whose activity is promoted by OsEDS1, degrades H2O2 to activate rice heat stress tolerance. Our findings greatly expand our understanding of heat stress responses in rice. We reveal a molecular framework that promotes heat tolerance through ROS homeostasis regulation, suggesting a theoretical basis and providing genetic resources for breeding heat-tolerant rice varieties.
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Affiliation(s)
- Min Liao
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Zemin Ma
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Yuanrong Kang
- Department of plant pathology, university of Kentucky, Lexington, Ky, 40506, USA
| | - Biaoming Zhang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Xuanlin Gao
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Feng Yu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China
| | - Pingfang Yang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China
- Hubei Hongshan Laboratory, Wuhan 430070, China
| | - Yinggen Ke
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China
- Hubei Hongshan Laboratory, Wuhan 430070, China
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11
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Khan MSS, Islam F, Chen H, Chang M, Wang D, Liu F, Fu ZQ, Chen J. Transcriptional Coactivators: Driving Force of Plant Immunity. FRONTIERS IN PLANT SCIENCE 2022; 13:823937. [PMID: 35154230 PMCID: PMC8831314 DOI: 10.3389/fpls.2022.823937] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Accepted: 01/10/2022] [Indexed: 05/03/2023]
Abstract
Salicylic acid (SA) is a plant defense signal that mediates local and systemic immune responses against pathogen invasion. However, the underlying mechanism of SA-mediated defense is very complex due to the involvement of various positive and negative regulators to fine-tune its signaling in diverse pathosystems. Upon pathogen infections, elevated level of SA promotes massive transcriptional reprogramming in which Non-expresser of PR genes 1 (NPR1) acts as a central hub and transcriptional coactivator in defense responses. Recent findings show that Enhanced Disease Susceptibility 1 (EDS1) also functions as a transcriptional coactivator and stimulates the expression of PR1 in the presence of NPR1 and SA. Furthermore, EDS1 stabilizes NPR1 protein level, while NPR1 sustains EDS1 expression during pathogenic infection. The interaction of NPR1 and EDS1 coactivators initiates transcriptional reprogramming by recruiting cyclin-dependent kinase 8 in the Mediator complex to control immune responses. In this review, we highlight the recent breakthroughs that considerably advance our understanding on how transcriptional coactivators interact with their functional partners to trigger distinct pathways to facilitate immune responses, and how SA accumulation induces dynamic changes in NPR1 structure for transcriptional reprogramming. In addition, the functions of different Mediator subunits in SA-mediated plant immunity are also discussed in light of recent discoveries. Taken together, the available evidence suggests that transcriptional coactivators are essential and potent regulators of plant defense pathways and play crucial roles in coordinating plant immune responses during plant-pathogen interactions.
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Affiliation(s)
| | - Faisal Islam
- Institute of Crop Science and Zhejiang Key Laboratory of Crop Germplasm, Zhejiang University, Hangzhou, China
| | - Huan Chen
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China
- Department of Biological Sciences, University of South Carolina, Columbia, SC, United States
| | - Ming Chang
- The Key Laboratory of Bio-interactions and Plant Health, College of Life Science, Nanjing Agricultural University, Nanjing, China
| | - Daowen Wang
- State Key Laboratory of Wheat and Maize Crop Science and College of Agronomy, Henan Agricultural University, Zhengzhou, China
| | - Fengquan Liu
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China
- *Correspondence: Fengquan Liu,
| | - Zheng Qing Fu
- Department of Biological Sciences, University of South Carolina, Columbia, SC, United States
- Zheng Qing Fu,
| | - Jian Chen
- International Genome Center, Jiangsu University, Zhenjiang, China
- Jian Chen,
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12
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Liu G, Li H, Fu D. Applications of virus-induced gene silencing for identification of gene function in fruit. FOOD QUALITY AND SAFETY 2021. [DOI: 10.1093/fqsafe/fyab018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Abstract
With the development of bioinformatics, it is easy to obtain information and data about thousands of genes, but the determination of the functions of these genes depends on methods for rapid and effective functional identification. Virus-induced gene silencing (VIGS) is a mature method of gene functional identification developed over the last 20 years, which has been widely used in many research fields involving many species. Fruit quality formation is a complex biological process, which is closely related to ripening. Here, we review the progress and contribution of VIGS to our understanding of fruit biology and its advantages and disadvantages in determining gene function.
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13
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Yoon JY, Palukaitis P. Cucumber Mosaic Virus 1a Protein Interacts with the Tobacco SHE1 Transcription Factor and Partitions between the Nucleus and the Tonoplast Membrane. THE PLANT PATHOLOGY JOURNAL 2021; 37:182-193. [PMID: 33866760 PMCID: PMC8053847 DOI: 10.5423/ppj.ft.03.2021.0045] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Accepted: 03/14/2021] [Indexed: 06/12/2023]
Abstract
The transcription factor SHE1 was identified as an interacting partner with the cucumber mosaic virus (CMV) 1a protein in the yeast two-hybrid system, by a pull-down assay, and via bimolecular fluorescent complementation. Using fluorescent-tagged proteins and confocal microscopy, the CMV 1a protein itself was found distributed predominantly between the nucleus and the tonoplast membrane, although it was also found in speckles in the cytoplasm. The SHE1 protein was localized in the nucleus, but in the presence of the CMV 1a protein was partitioned between the nucleus and the tonoplast membrane. SHE1 expression was induced by infection of tobacco with four tested viruses: CMV, tobacco mosaic virus, potato virus X and potato virus Y. Transgenic tobacco expressing the CMV 1a protein showed constitutive expression of SHE1, indicating that the CMV 1a protein may be responsible for its induction. However, previously, such plants also were shown to have less resistance to local and systemic movement of tobacco mosaic virus (TMV) expressing the green fluorescent protein, suggesting that the CMV 1a protein may act to prevent the function of the SHE1 protein. SHE1 is a member of the AP2/ERF class of transcription factors and is conserved in sequence in several Nicotiana species, although two clades of SHE1 could be discerned, including both different Nicotiana species and cultivars of tobacco, varying by the presence of particular insertions or deletions.
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Affiliation(s)
- Ju-Yeon Yoon
- Virology Unit, Division of Horticultural and Herbal Crop Environment, National Institute of Horticultural and Herbal Science, Rural Development Administration, Wanju 55365,
Korea
| | - Peter Palukaitis
- Department of Horticulture Sciences, Seoul Women's University, Seoul 01797,
Korea
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14
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Zou X, Zhao K, Liu Y, Du M, Zheng L, Wang S, Xu L, Peng A, He Y, Long Q, Chen S. Overexpression of Salicylic Acid Carboxyl Methyltransferase ( CsSAMT1) Enhances Tolerance to Huanglongbing Disease in Wanjincheng Orange ( Citrus sinensis (L.) Osbeck). Int J Mol Sci 2021; 22:ijms22062803. [PMID: 33802058 PMCID: PMC7999837 DOI: 10.3390/ijms22062803] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 03/05/2021] [Accepted: 03/08/2021] [Indexed: 11/30/2022] Open
Abstract
Citrus Huanglongbing (HLB) disease or citrus greening is caused by Candidatus Liberibacter asiaticus (Las) and is the most devastating disease in the global citrus industry. Salicylic acid (SA) plays a central role in regulating plant defenses against pathogenic attack. SA methyltransferase (SAMT) modulates SA homeostasis by converting SA to methyl salicylate (MeSA). Here, we report on the functions of the citrus SAMT (CsSAMT1) gene from HLB-susceptible Wanjincheng orange (Citrus sinensis (L.) Osbeck) in plant defenses against Las infection. The CsSAMT1 cDNA was expressed in yeast. Using in vitro enzyme assays, yeast expressing CsSAMT1 was confirmed to specifically catalyze the formation of MeSA using SA as a substrate. Transgenic Wanjincheng orange plants overexpressing CsSAMT1 had significantly increased levels of SA and MeSA compared to wild-type controls. HLB resistance was evaluated for two years and showed that transgenic plants displayed significantly alleviated symptoms including a lack of chlorosis, low bacterial counts, reduced hyperplasia of the phloem cells, and lower levels of starch and callose compared to wild-type plants. These data confirmed that CsSAMT1 overexpression confers an enhanced tolerance to Las in citrus fruits. RNA-seq analysis revealed that CsSAMT1 overexpression significantly upregulated the citrus defense response by enhancing the transcription of disease resistance genes. This study provides insight for improving host resistance to HLB by manipulation of SA signaling in citrus fruits.
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15
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Brosseau C, Bolaji A, Roussin-Léveillée C, Zhao Z, Biga S, Moffett P. Natural variation in the Arabidopsis AGO2 gene is associated with susceptibility to potato virus X. THE NEW PHYTOLOGIST 2020; 226:866-878. [PMID: 31880814 DOI: 10.1111/nph.16397] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 12/12/2019] [Indexed: 06/10/2023]
Abstract
RNA silencing functions as an anti-viral defence in plants through the action of DICER-like (DCL) and ARGONAUTE (AGO) proteins. Despite the importance of this mechanism, little is known about the functional consequences of variation in genes encoding RNA silencing components. The AGO2 protein has been shown to be important for defense against multiple viruses, and we investigated how naturally occurring differences in AGO2 between and within species affects its antiviral activities. We find that the AGO2 protein from Arabidopsis thaliana, but not Nicotiana benthamiana, effectively limits potato virus X (PVX). Consistent with this, we find that the A. thaliana AGO2 gene shows a high incidence of polymorphisms between accessions, with evidence of selective pressure. Using functional analyses, we identify polymorphisms that specifically affect AGO2 antiviral activity, without interfering with other AGO2-associated functions such as anti-bacterial resistance or DNA methylation. Our results suggest that viruses adapt to overcome RNA silencing in their hosts. Furthermore, they indicate that plant-virus interactions have influenced natural variation in RNA-silencing components and that the latter may be a source of genetically encoded virus resistance.
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Affiliation(s)
- Chantal Brosseau
- Département de Biologie, Centre SÈVE, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada
| | - Ayooluwa Bolaji
- Département de Biologie, Centre SÈVE, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada
| | | | - Zhenxing Zhao
- Département de Biologie, Centre SÈVE, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada
| | - Sébastien Biga
- Département de Biologie, Centre SÈVE, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada
| | - Peter Moffett
- Département de Biologie, Centre SÈVE, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada
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16
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Jeon H, Kim W, Kim B, Lee S, Jayaraman J, Jung G, Choi S, Sohn KH, Segonzac C. Ralstonia solanacearum Type III Effectors with Predicted Nuclear Localization Signal Localize to Various Cell Compartments and Modulate Immune Responses in Nicotiana spp. THE PLANT PATHOLOGY JOURNAL 2020; 36:43-53. [PMID: 32089660 PMCID: PMC7012579 DOI: 10.5423/ppj.oa.08.2019.0227] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 11/19/2019] [Accepted: 11/19/2019] [Indexed: 05/11/2023]
Abstract
Ralstonia solanacearum (Rso) is a causal agent of bacterial wilt in Solanaceae crops worldwide including Republic of Korea. Rso virulence predominantly relies on type III secreted effectors (T3Es). However, only a handful of Rso T3Es have been characterized. In this study, we investigated subcellular localization of and manipulation of plant immunity by 8 Rso T3Es predicted to harbor a nuclear localization signal (NLS). While 2 of these T3Es elicited cell death in both Nicotiana benthamiana and N. tabacum, only one was dependent on suppressor of G2 allele of skp1 (SGT1), a molecular chaperone of nucleotide-binding and leucine-rich repeat immune receptors. We also identified T3Es that differentially regulate flg22-induced reactive oxygen species production and gene expression. Interestingly, several of the NLS-containing T3Es translationally fused with yellow fluorescent protein accumulated in subcellular compartments other than the cell nucleus. Our findings bring new clues to decipher Rso T3E function in planta.
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Affiliation(s)
- Hyelim Jeon
- Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826,
Korea
| | - Wanhui Kim
- Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826,
Korea
- Plant Immunity Research Center, Seoul National University, Seoul 08826,
Korea
| | - Boyoung Kim
- Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826,
Korea
| | - Sookyeong Lee
- Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826,
Korea
| | - Jay Jayaraman
- Department of Life Sciences, Pohang University of Science and Technology, Pohang 37673,
Korea
- New Zealand Institute for Plant & Food Research Limited (PFR), Mt Albert Auckland 1025,
New Zealand
| | - Gayoung Jung
- Department of Life Sciences, Pohang University of Science and Technology, Pohang 37673,
Korea
| | - Sera Choi
- Department of Life Sciences, Pohang University of Science and Technology, Pohang 37673,
Korea
| | - Kee Hoon Sohn
- Department of Life Sciences, Pohang University of Science and Technology, Pohang 37673,
Korea
- School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology, Pohang 37673,
Korea
| | - Cécile Segonzac
- Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826,
Korea
- Plant Immunity Research Center, Seoul National University, Seoul 08826,
Korea
- Corresponding author: Phone) +82-2-880-2229, FAX) +82-2-873-2056, E-mail)
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17
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Ma X, Zhou Y, Moffett P. Alterations in cellular RNA decapping dynamics affect tomato spotted wilt virus cap snatching and infection in Arabidopsis. THE NEW PHYTOLOGIST 2019; 224:789-803. [PMID: 31292958 DOI: 10.1111/nph.16049] [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] [Received: 05/01/2019] [Accepted: 06/27/2019] [Indexed: 06/09/2023]
Abstract
RNA processing and decay pathways have important impacts on RNA viruses, particularly animal-infecting bunyaviruses, which utilize a cap-snatching mechanism to translate their mRNAs. However, their effects on plant-infecting bunyaviruses have not been investigated. The roles of mRNA degradation and non-sense-mediated decay components, including DECAPPING 2 (DCP2), EXORIBONUCLEASE 4 (XRN4), ASYMMETRIC LEAVES2 (AS2) and UP-FRAMESHIFT 1 (UPF1) were investigated in infection of Arabidopsis thaliana by several RNA viruses, including the bunyavirus, tomato spotted wilt virus (TSWV). TSWV infection on mutants with decreased or increased RNA decapping ability resulted in increased and decreased susceptibility, respectively. By contrast, these mutations had the opposite, or no, effect on RNA viruses that use different mRNA capping strategies. Consistent with this, the RNA capping efficiency of TSWV mRNA was higher in a dcp2 mutant. Furthermore, the TSWV N protein partially colocalized with RNA processing body (PB) components and altering decapping activity by heat shock or coinfection with another virus resulted in corresponding changes in TSWV accumulation. The present results indicate that TSWV infection in plants depends on its ability to snatch caps from mRNAs destined for decapping in PBs and that genetic or environmental alteration of RNA processing dynamics can affect infection outcomes.
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Affiliation(s)
- Xiaofang Ma
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Jiangsu Technical Service Center of Diagnosis and Detection for Plant Virus Diseases, no. 50 Zhongling Street, Nanjing, Jiangsu, 210014, China
- Centre SÈVE, Département de Biologie, Université de Sherbrooke, 2500 Blvd. de l' Université, Sherbrooke, QC, J1K 2R1, Canada
| | - Yijun Zhou
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Jiangsu Technical Service Center of Diagnosis and Detection for Plant Virus Diseases, no. 50 Zhongling Street, Nanjing, Jiangsu, 210014, China
| | - Peter Moffett
- Centre SÈVE, Département de Biologie, Université de Sherbrooke, 2500 Blvd. de l' Université, Sherbrooke, QC, J1K 2R1, Canada
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18
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Combier M, Evangelisti E, Piron MC, Rengel D, Legrand L, Shenhav L, Bouchez O, Schornack S, Mestre P. A secreted WY-domain-containing protein present in European isolates of the oomycete Plasmopara viticola induces cell death in grapevine and tobacco species. PLoS One 2019; 14:e0220184. [PMID: 31356604 PMCID: PMC6663016 DOI: 10.1371/journal.pone.0220184] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Accepted: 07/10/2019] [Indexed: 01/02/2023] Open
Abstract
Plasmopara viticola is a biotrophic oomycete pathogen causing grapevine downy mildew. We characterized the repertoire of P. viticola effector proteins which may be translocated into plants to support the disease. We found several secreted proteins that contain canonical dEER motifs and conserved WY-domains but lack the characteristic RXLR motif reported previously from oomycete effectors. We cloned four candidates and showed that one of them, Pv33, induces plant cell death in grapevine and Nicotiana species. This activity is dependent on the nuclear localization of the protein. Sequence similar effectors were present in seven European, but in none of the tested American isolates. Together our work contributes a new type of conserved P. viticola effector candidates.
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Affiliation(s)
- Maud Combier
- SVQV, Université de Strasbourg, INRA, Colmar, France
| | - Edouard Evangelisti
- University of Cambridge, Sainsbury Laboratory (SLCU), Cambridge, United Kingdom
| | | | - David Rengel
- LIPM Laboratoire des Interactions Plantes-Microorganismes, Université de Toulouse, INRA, CNRS, Castanet-Tolosan, France
| | - Ludovic Legrand
- LIPM Laboratoire des Interactions Plantes-Microorganismes, Université de Toulouse, INRA, CNRS, Castanet-Tolosan, France
| | - Liron Shenhav
- University of Cambridge, Sainsbury Laboratory (SLCU), Cambridge, United Kingdom
| | | | - Sebastian Schornack
- University of Cambridge, Sainsbury Laboratory (SLCU), Cambridge, United Kingdom
| | - Pere Mestre
- SVQV, Université de Strasbourg, INRA, Colmar, France
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19
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Zhang Y, Song G, Lal NK, Nagalakshmi U, Li Y, Zheng W, Huang PJ, Branon TC, Ting AY, Walley JW, Dinesh-Kumar SP. TurboID-based proximity labeling reveals that UBR7 is a regulator of N NLR immune receptor-mediated immunity. Nat Commun 2019; 10:3252. [PMID: 31324801 PMCID: PMC6642208 DOI: 10.1038/s41467-019-11202-z] [Citation(s) in RCA: 136] [Impact Index Per Article: 27.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 07/01/2019] [Indexed: 11/25/2022] Open
Abstract
Nucleotide-binding leucine-rich repeat (NLR) immune receptors play a critical role in defence against pathogens in plants and animals. However, we know very little about NLR-interacting proteins and the mechanisms that regulate NLR levels. Here, we used proximity labeling (PL) to identify the proteome proximal to N, which is an NLR that confers resistance to Tobacco mosaic virus (TMV). Evaluation of different PL methods indicated that TurboID-based PL provides more efficient levels of biotinylation than BioID and BioID2 in plants. TurboID-based PL of N followed by quantitative proteomic analysis and genetic screening revealed multiple regulators of N-mediated immunity. Interestingly, a putative E3 ubiquitin ligase, UBR7, directly interacts with the TIR domain of N. UBR7 downregulation leads to an increased amount of N protein and enhanced TMV resistance. TMV-p50 effector disrupts the N-UBR7 interaction and relieves negative regulation of N. These findings demonstrate the utility of TurboID-based PL in plants and the N-interacting proteins we identified enhance our understanding of the mechanisms underlying NLR regulation.
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Affiliation(s)
- Yongliang Zhang
- Department of Plant Biology and The Genome Center, College of Biological Sciences, University of California, Davis, Davis, CA, 95616, USA.
- State Key Laboratory of Agro-Biotechnology and Ministry of Agriculture Key Laboratory of Soil Microbiology, College of Biological Sciences, China Agricultural University, Beijing, 100193, China.
| | - Gaoyuan Song
- Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA, 50011, USA
| | - Neeraj K Lal
- Department of Plant Biology and The Genome Center, College of Biological Sciences, University of California, Davis, Davis, CA, 95616, USA
| | - Ugrappa Nagalakshmi
- Department of Plant Biology and The Genome Center, College of Biological Sciences, University of California, Davis, Davis, CA, 95616, USA
| | - Yuanyuan Li
- Department of Plant Biology and The Genome Center, College of Biological Sciences, University of California, Davis, Davis, CA, 95616, USA
| | - Wenjie Zheng
- Department of Plant Biology and The Genome Center, College of Biological Sciences, University of California, Davis, Davis, CA, 95616, USA
| | - Pin-Jui Huang
- Department of Plant Biology and The Genome Center, College of Biological Sciences, University of California, Davis, Davis, CA, 95616, USA
| | - Tess C Branon
- Departments of Genetics, Stanford University, Stanford, CA, 94305, USA
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA
- Department of Biology, Stanford University, Stanford, CA, 94305, USA
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Alice Y Ting
- Departments of Genetics, Stanford University, Stanford, CA, 94305, USA
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA
- Department of Biology, Stanford University, Stanford, CA, 94305, USA
- Chan Zuckerberg Biohub, San Francisco, CA, 94158, USA
| | - Justin W Walley
- Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA, 50011, USA.
| | - Savithramma P Dinesh-Kumar
- Department of Plant Biology and The Genome Center, College of Biological Sciences, University of California, Davis, Davis, CA, 95616, USA.
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20
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Li S, Zhao J, Zhai Y, Yuan Q, Zhang H, Wu X, Lu Y, Peng J, Sun Z, Lin L, Zheng H, Chen J, Yan F. The hypersensitive induced reaction 3 (HIR3) gene contributes to plant basal resistance via an EDS1 and salicylic acid-dependent pathway. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2019; 98:783-797. [PMID: 30730076 DOI: 10.1111/tpj.14271] [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] [Received: 12/06/2018] [Revised: 01/25/2019] [Accepted: 01/30/2019] [Indexed: 05/20/2023]
Abstract
The hypersensitive-induced reaction (HIR) gene family is associated with the hypersensitive response (HR) that is a part of the plant defense system against bacterial and fungal pathogens. The involvement of HIR genes in response to viral pathogens has not yet been studied. We now report that the HIR3 genes of Nicotiana benthamiana and Oryza sativa (rice) were upregulated following rice stripe virus (RSV) infection. Silencing of HIR3s in N. benthamiana resulted in an increased accumulation of RSV RNAs, whereas overexpression of HIR3s in N. benthamiana or rice reduced the expression of RSV RNAs and decreased symptom severity, while also conferring resistance to Turnip mosaic virus, Potato virus X, and the bacterial pathogens Pseudomonas syringae and Xanthomonas oryzae. Silencing of HIR3 genes in N. benthamiana reduced the content of salicylic acid (SA) and was accompanied by the downregulated expression of genes in the SA pathway. Transient expression of the two HIR3 gene homologs from N. benthamiana or the rice HIR3 gene in N. benthamiana leaves caused cell death and an accumulation of SA, but did not do so in EDS1-silenced plants or in plants expressing NahG. The results indicate that HIR3 contributes to plant basal resistance via an EDS1- and SA-dependent pathway.
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Affiliation(s)
- Saisai Li
- College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, China, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Jinping Zhao
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, China, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Yushan Zhai
- College of Plant Protection, Northwest A& F University, Yangling, 712100, China
| | - Quan Yuan
- College of Plant Protection, Northwest A& F University, Yangling, 712100, China
| | - Hehong Zhang
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, China, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Xinyang Wu
- College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, China, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Yuwen Lu
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, China, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
- Institute of Plant Virology, Ningbo University, Ningbo, 315211, China
| | - Jiejun Peng
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, China, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
- Institute of Plant Virology, Ningbo University, Ningbo, 315211, China
| | - Zongtao Sun
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, China, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
- Institute of Plant Virology, Ningbo University, Ningbo, 315211, China
| | - Lin Lin
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, China, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
- Institute of Plant Virology, Ningbo University, Ningbo, 315211, China
| | - Hongying Zheng
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, China, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
- Institute of Plant Virology, Ningbo University, Ningbo, 315211, China
| | - Jianping Chen
- College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, China, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
- Institute of Plant Virology, Ningbo University, Ningbo, 315211, China
| | - Fei Yan
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, China, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
- Institute of Plant Virology, Ningbo University, Ningbo, 315211, China
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21
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Ke Y, Kang Y, Wu M, Liu H, Hui S, Zhang Q, Li X, Xiao J, Wang S. Jasmonic Acid-Involved OsEDS1 Signaling in Rice-Bacteria Interactions. RICE (NEW YORK, N.Y.) 2019; 12:25. [PMID: 30989404 PMCID: PMC6465387 DOI: 10.1186/s12284-019-0283-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 03/27/2019] [Indexed: 05/28/2023]
Abstract
BACKGROUND The function of Arabidopsis enhanced disease susceptibility 1 (AtEDS1) and its sequence homologs in other dicots have been extensively studied. However, it is unknown whether rice EDS1 homolog (OsEDS1) plays a role in regulating the rice-pathogen interaction. RESULTS In this study, a OsEDS1-knouckout mutant (oseds1) was characterized and shown to have increased susceptibility to Xanthomonas oryzae pv. oryzae (Xoo) and Xanthomonas oryzae pv. oryzicola (Xoc), suggesting the positive role of OsEDS1 in regulating rice disease resistance. However, the following evidence suggests that OsEDS1 shares some differences with AtEDS1 in its way to regulate the host-pathogen interactions. Firstly, OsEDS1 modulates the rice-bacteria interactions involving in jasmonic acid (JA) signaling pathway, while AtEDS1 regulates Arabidopsis disease resistance against biotrophic pathogens depending on salicylic acid (SA) signaling pathway. Secondly, introducing AtEDS1 could reduce oseds1 mutant susceptibility to Xoo rather than to Xoc. Thirdly, exogenous application of JA and SA cannot complement the susceptible phenotype of the oseds1 mutant, while exogenous application of SA is capable of complementing the susceptible phenotype of the ateds1 mutant. Finally, OsEDS1 is not required for R gene mediated resistance, while AtEDS1 is required for disease resistance mediated by TIR-NB-LRR class of R proteins. CONCLUSION OsEDS1 is a positive regulator in rice-pathogen interactions, and shares both similarities and differences with AtEDS1 in its way to regulate plant-pathogen interactions.
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Affiliation(s)
- Yinggen Ke
- National Key Laboratory of Crop Genetic Improvement, National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
| | - Yuanrong Kang
- National Key Laboratory of Crop Genetic Improvement, National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
| | - Mengxiao Wu
- National Key Laboratory of Crop Genetic Improvement, National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
| | - Hongbo Liu
- National Key Laboratory of Crop Genetic Improvement, National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
| | - Shugang Hui
- National Key Laboratory of Crop Genetic Improvement, National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
| | - Qinglu Zhang
- National Key Laboratory of Crop Genetic Improvement, National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
| | - Xianghua Li
- National Key Laboratory of Crop Genetic Improvement, National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
| | - Jinghua Xiao
- National Key Laboratory of Crop Genetic Improvement, National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
| | - Shiping Wang
- National Key Laboratory of Crop Genetic Improvement, National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China.
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22
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Aguilar E, del Toro FJ, Brosseau C, Moffett P, Canto T, Tenllado F. Cell death triggered by the P25 protein in Potato virus X-associated synergisms results from endoplasmic reticulum stress in Nicotiana benthamiana. MOLECULAR PLANT PATHOLOGY 2019; 20:194-210. [PMID: 30192053 PMCID: PMC6637867 DOI: 10.1111/mpp.12748] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The synergistic interaction of Potato virus X (PVX) with a number of potyviruses results in systemic necrosis in Nicotiana spp. Previous investigations have indicated that the viral suppressor of RNA silencing (VSR) protein P25 of PVX triggers systemic necrosis in PVX-associated synergisms in a threshold-dependent manner. However, little is still known about the cellular processes that lead to this necrosis, and whether the VSR activity of P25 is involved in its elicitation. Here, we show that transient expression of P25 in the presence of VSRs from different viruses, including the helper component-proteinase (HC-Pro) of potyviruses, induces endoplasmic reticulum (ER) stress and the unfolded protein response (UPR), which ultimately lead to ER collapse. However, the host RNA silencing pathway was dispensable for the elicitation of cell death by P25. Confocal microscopy studies in leaf patches co-expressing P25 and HC-Pro showed dramatic alterations in ER membrane structures, which correlated with the up-regulation of bZIP60 and several ER-resident chaperones, including the ER luminal binding protein (BiP). Overexpression of BiP alleviated the cell death induced by the potexviral P25 protein when expressed together with VSRs derived from different viruses. Conversely, silencing of the UPR master regulator, bZIP60, led to an increase in cell death elicited by the P25/HC-Pro combination as well as by PVX-associated synergism. In addition to its role as a negative regulator of P25-induced cell death, UPR partially restricted PVX infection. Thus, systemic necrosis caused by PVX-associated synergistic infections is probably the effect of an unmitigated ER stress following the overaccumulation of a viral protein, P25, with ER remodelling activity.
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Affiliation(s)
- Emmanuel Aguilar
- Departamento de Biotecnología Microbiana y de PlantasCentro de Investigaciones Biológicas, CSICMadrid28040Spain
| | - Francisco J. del Toro
- Departamento de Biotecnología Microbiana y de PlantasCentro de Investigaciones Biológicas, CSICMadrid28040Spain
| | - Chantal Brosseau
- Centre SÈVE, Département de BiologieUniversité de SherbrookeSherbrookeQCJ1K 2R1Canada
| | - Peter Moffett
- Centre SÈVE, Département de BiologieUniversité de SherbrookeSherbrookeQCJ1K 2R1Canada
| | - Tomás Canto
- Departamento de Biotecnología Microbiana y de PlantasCentro de Investigaciones Biológicas, CSICMadrid28040Spain
| | - Francisco Tenllado
- Departamento de Biotecnología Microbiana y de PlantasCentro de Investigaciones Biológicas, CSICMadrid28040Spain
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23
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Chen G, Wei B, Li G, Gong C, Fan R, Zhang X. TaEDS1 genes positively regulate resistance to powdery mildew in wheat. PLANT MOLECULAR BIOLOGY 2018; 96:607-625. [PMID: 29582247 DOI: 10.1007/s11103-018-0718-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 03/12/2018] [Indexed: 06/08/2023]
Abstract
Three EDS1 genes were cloned from common wheat and were demonstrated to positively regulate resistance to powdery mildew in wheat. The EDS1 proteins play important roles in plant basal resistance and TIR-NB-LRR protein-triggered resistance in dicots. Until now, there have been very few studies on EDS1 in monocots, and none in wheat. Here, we report on three common wheat orthologous genes of EDS1 family (TaEDS1-5A, 5B and 5D) and their function in powdery mildew resistance. Comparisons of these genes with their orthologs in diploid ancestors revealed that EDS1 is a conserved gene family in Triticeae. The cDNA sequence similarity among the three TaEDS1 genes was greater than 96.5%, and they shared sequence similarities of more than 99.6% with the respective orthologs from diploid ancestors. The phylogenetic analysis revealed that the EDS1 family originated prior to the differentiation of monocots and dicots, and EDS1 members have since undergone clear structural differentiation. The transcriptional levels of TaEDS1 genes in the leaves were obviously higher than those of the other organs, and they were induced by Blumeria graminis f. sp. tritici (Bgt) infection and salicylic acid (SA) treatment. The BSMV-VIGS experiments indicated that knock-down the transcriptional levels of the TaEDS1 genes in a powdery mildew-resistant variety of common wheat compromised resistance. Contrarily, transient overexpression of TaEDS1 genes in a susceptible common wheat variety significantly reduced the haustorium index and attenuated the growth of Bgt. Furthermore, the expression of TaEDS1 genes in the Arabidopsis mutant eds1-1 complemented its susceptible phenotype to powdery mildew. The above evidences strongly suggest that TaEDS1 acts as a positive regulator and confers resistance against powdery mildew in common wheat.
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Affiliation(s)
- Guiping Chen
- State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
- Department of Life Science, Tangshan Normal University, Tangshan, 063000, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Bo Wei
- State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Guoliang Li
- State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
- Institute of Genetics and Physiology, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang, 050051, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Caiyan Gong
- State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Renchun Fan
- State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.
| | - Xiangqi Zhang
- State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.
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24
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Townsend PD, Dixon CH, Slootweg EJ, Sukarta OCA, Yang AWH, Hughes TR, Sharples GJ, Pålsson LO, Takken FLW, Goverse A, Cann MJ. The intracellular immune receptor Rx1 regulates the DNA-binding activity of a Golden2-like transcription factor. J Biol Chem 2018; 293:3218-3233. [PMID: 29217772 PMCID: PMC5836133 DOI: 10.1074/jbc.ra117.000485] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Revised: 11/14/2017] [Indexed: 12/22/2022] Open
Abstract
Plant nucleotide-binding leucine-rich repeat (NLR) proteins enable the immune system to recognize and respond to pathogen attack. An early consequence of immune activation is transcriptional reprogramming, and some NLRs have been shown to act in the nucleus and interact with transcription factors. The Rx1 NLR protein of potato is further able to bind and distort double-stranded DNA. However, Rx1 host targets that support a role for Rx1 in transcriptional reprogramming at DNA are unknown. Here, we report a functional interaction between Rx1 and NbGlk1, a Golden2-like transcription factor. Rx1 binds to NbGlk1 in vitro and in planta. NbGlk1 binds to known Golden2-like consensus DNA sequences. Rx1 reduces the binding affinity of NbGlk1 for DNA in vitro. NbGlk1 activates cellular responses to potato virus X, whereas Rx1 associates with NbGlk1 and prevents its assembly on DNA in planta unless activated by PVX. This study provides new mechanistic insight into how an NLR can coordinate an immune signaling response at DNA following pathogen perceptions.
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Affiliation(s)
- Philip D Townsend
- From the Department of Biosciences
- Biophysical Sciences Institute, and
| | | | - Erik J Slootweg
- the Laboratory of Nematology, Department of Plant Sciences, Wageningen University, 6708 PB Wageningen, The Netherlands
| | - Octavina C A Sukarta
- the Laboratory of Nematology, Department of Plant Sciences, Wageningen University, 6708 PB Wageningen, The Netherlands
| | - Ally W H Yang
- the Donnelly Centre, University of Toronto, Toronto, Ontario M5S 3E1, Canada, and
| | - Timothy R Hughes
- the Donnelly Centre, University of Toronto, Toronto, Ontario M5S 3E1, Canada, and
| | - Gary J Sharples
- From the Department of Biosciences
- Biophysical Sciences Institute, and
| | - Lars-Olof Pålsson
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, United Kingdom
| | - Frank L W Takken
- Molecular Plant Pathology, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Aska Goverse
- the Laboratory of Nematology, Department of Plant Sciences, Wageningen University, 6708 PB Wageningen, The Netherlands
| | - Martin J Cann
- From the Department of Biosciences,
- Biophysical Sciences Institute, and
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25
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Ludman M, Burgyán J, Fátyol K. Crispr/Cas9 Mediated Inactivation of Argonaute 2 Reveals its Differential Involvement in Antiviral Responses. Sci Rep 2017; 7:1010. [PMID: 28432338 PMCID: PMC5430636 DOI: 10.1038/s41598-017-01050-6] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Accepted: 03/17/2017] [Indexed: 12/21/2022] Open
Abstract
RNA silencing constitutes an important antiviral mechanism in plants. Small RNA guided Argonaute proteins fulfill essential role in this process by acting as executors of viral restriction. Plants encode multiple Argonaute proteins of which several exhibit antiviral activities. A recent addition to this group is AGO2. Its involvement in antiviral responses is established predominantly by studies employing mutants of Arabidopsis thaliana. In the virological model plant, Nicotiana benthamiana, the contribution of AGO2 to antiviral immunity is much less certain due to the lack of appropriate genetic mutants. Previous studies employed various RNAi based tools to down-regulate AGO2 expression. However, these techniques have several disadvantages, especially in the context of antiviral RNA silencing. Here, we have utilized the CRISPR/Cas9 technology to inactivate the AGO2 gene of N. benthamiana. The ago2 plants exhibit differential sensitivities towards various viruses. AGO2 is a critical component of the plants' immune responses against PVX, TuMV and TCV. In contrast, AGO2 deficiency does not significantly influence the progression of tombusvirus and CMV infections. In summary, our work provides unequivocal proof for the virus-specific antiviral role of AGO2 in a plant species other than A. thaliana for the first time.
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Affiliation(s)
- Márta Ludman
- Agricultural Biotechnology Institute, National Agricultural Research and Innovation Centre, Szent-Györgyi Albert u. 4, Gödöllő, 2100, Hungary
| | - József Burgyán
- Agricultural Biotechnology Institute, National Agricultural Research and Innovation Centre, Szent-Györgyi Albert u. 4, Gödöllő, 2100, Hungary.
| | - Károly Fátyol
- Agricultural Biotechnology Institute, National Agricultural Research and Innovation Centre, Szent-Györgyi Albert u. 4, Gödöllő, 2100, Hungary.
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26
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Vega-Arreguín JC, Shimada-Beltrán H, Sevillano-Serrano J, Moffett P. Non-host Plant Resistance against Phytophthora capsici Is Mediated in Part by Members of the I2 R Gene Family in Nicotiana spp. FRONTIERS IN PLANT SCIENCE 2017; 8:205. [PMID: 28261255 PMCID: PMC5309224 DOI: 10.3389/fpls.2017.00205] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 02/03/2017] [Indexed: 05/29/2023]
Abstract
The identification of host genes associated with resistance to Phytophthora capsici is crucial to developing strategies of control against this oomycete pathogen. Since there are few sources of resistance to P. capsici in crop plants, non-host plants represent a promising source of resistance genes as well as excellent models to study P. capsici - plant interactions. We have previously shown that non-host resistance to P. capsici in Nicotiana spp. is mediated by the recognition of a specific P. capsici effector protein, PcAvr3a1 in a manner that suggests the involvement of a cognate disease resistance (R) genes. Here, we have used virus-induced gene silencing (VIGS) and transgenic tobacco plants expressing dsRNA in Nicotiana spp. to identify candidate R genes that mediate non-host resistance to P. capsici. Silencing of members of the I2 multigene family in the partially resistant plant N. edwardsonii and in the resistant N. tabacum resulted in compromised resistance to P. capsici. VIGS of two other components required for R gene-mediated resistance, EDS1 and SGT1, also enhanced susceptibility to P. capsici in N. edwardsonii, as well as in the susceptible plants N. benthamiana and N. clevelandii. The silencing of I2 family members in N. tabacum also compromised the recognition of PcAvr3a1. These results indicate that in this case, non-host resistance is mediated by the same components normally associated with race-specific resistance.
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Affiliation(s)
- Julio C. Vega-Arreguín
- Boyce Thompson Institute for Plant Research, IthacaNY, USA
- Laboratorio de Ciencias Agrogenómicas, Escuela Nacional de Estudios Superiores – León, Universidad Nacional Autónoma de MexicoLeón, Mexico
| | - Harumi Shimada-Beltrán
- Laboratorio de Ciencias Agrogenómicas, Escuela Nacional de Estudios Superiores – León, Universidad Nacional Autónoma de MexicoLeón, Mexico
| | - Jacobo Sevillano-Serrano
- Laboratorio de Ciencias Agrogenómicas, Escuela Nacional de Estudios Superiores – León, Universidad Nacional Autónoma de MexicoLeón, Mexico
| | - Peter Moffett
- Boyce Thompson Institute for Plant Research, IthacaNY, USA
- Département de Biologie, Faculté des Sciences, Université de Sherbrooke, SherbrookeQC, Canada
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27
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Pfeilmeier S, Saur IML, Rathjen JP, Zipfel C, Malone JG. High levels of cyclic-di-GMP in plant-associated Pseudomonas correlate with evasion of plant immunity. MOLECULAR PLANT PATHOLOGY 2016; 17:521-31. [PMID: 26202381 PMCID: PMC4982027 DOI: 10.1111/mpp.12297] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The plant innate immune system employs plasma membrane-localized receptors that specifically perceive pathogen/microbe-associated molecular patterns (PAMPs/MAMPs). This induces a defence response called pattern-triggered immunity (PTI) to fend off pathogen attack. Commensal bacteria are also exposed to potential immune recognition and must employ strategies to evade and/or suppress PTI to successfully colonize the plant. During plant infection, the flagellum has an ambiguous role, acting as both a virulence factor and also as a potent immunogen as a result of the recognition of its main building block, flagellin, by the plant pattern recognition receptors (PRRs), including FLAGELLIN SENSING2 (FLS2). Therefore, strict control of flagella synthesis is especially important for plant-associated bacteria. Here, we show that cyclic-di-GMP [bis-(3'-5')-cyclic di-guanosine monophosphate], a central regulator of bacterial lifestyle, is involved in the evasion of PTI. Elevated cyclic-di-GMP levels in the pathogen Pseudomonas syringae pv. tomato (Pto) DC3000, the opportunist P. aeruginosa PAO1 and the commensal P. protegens Pf-5 inhibit flagellin synthesis and help the bacteria to evade FLS2-mediated signalling in Nicotiana benthamiana and Arabidopsis thaliana. Despite this, high cellular cyclic-di-GMP concentrations were shown to drastically reduce the virulence of Pto DC3000 during plant infection. We propose that this is a result of reduced flagellar motility and/or additional pleiotropic effects of cyclic-di-GMP signalling on bacterial behaviour.
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Affiliation(s)
- Sebastian Pfeilmeier
- The Sainsbury Laboratory, Norwich Research Park, Norwich, NR4 7UH, UK
- John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK
| | - Isabel Marie-Luise Saur
- Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia
| | - John Paul Rathjen
- Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia
| | - Cyril Zipfel
- The Sainsbury Laboratory, Norwich Research Park, Norwich, NR4 7UH, UK
| | - Jacob George Malone
- John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK
- University of East Anglia, Norwich, NR4 7TJ, UK
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28
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Meteignier LV, Zhou J, Cohen M, Bhattacharjee S, Brosseau C, Chan MGC, Robatzek S, Moffett P. NB-LRR signaling induces translational repression of viral transcripts and the formation of RNA processing bodies through mechanisms differing from those activated by UV stress and RNAi. JOURNAL OF EXPERIMENTAL BOTANY 2016; 67:2353-66. [PMID: 26889008 DOI: 10.1093/jxb/erw042] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Plant NB-LRR proteins confer resistance to multiple pathogens, including viruses. Although the recognition of viruses by NB-LRR proteins is highly specific, previous studies have suggested that NB-LRR activation results in a response that targets all viruses in the infected cell. Using an inducible system to activate NB-LRR defenses, we find that NB-LRR signaling does not result in the degradation of viral transcripts, but rather prevents them from associating with ribosomes and translating their genetic material. This indicates that defense against viruses involves the repression of viral RNA translation. This repression is specific to viral transcripts and does not involve a global shutdown of host cell translation. As a consequence of the repression of viral RNA translation, NB-LRR responses induce a dramatic increase in the biogenesis of RNA processing bodies (PBs). We demonstrate that other pathways that induce translational repression, such as UV irradiation and RNAi, also induce PBs. However, by investigating the phosphorylation status of eIF2α and by using suppressors of RNAi we show that the mechanisms leading to PB induction by NB-LRR signaling are different from these stimuli, thus defining a distinct type of translational control and anti-viral mechanism in plants.
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Affiliation(s)
- Louis-Valentin Meteignier
- Centre SÈVE, Département de Biologie, Université de Sherbrooke, 2500 Boulevard de l'Université, Sherbrooke J1K 2R1, QC, Canada
| | - Ji Zhou
- The Sainsbury Laboratory, Norwich Research Park, Norwich NR4 7UH, UK The Genome Analysis Centre & John Innes Centre, Norwich Research Park, Norwich NR4 7UH, UK
| | - Mathias Cohen
- Centre SÈVE, Département de Biologie, Université de Sherbrooke, 2500 Boulevard de l'Université, Sherbrooke J1K 2R1, QC, Canada
| | - Saikat Bhattacharjee
- Regional Centre for Biotechnology, 180, Udyog Vihar Phase I, Gurgaon-122016, India
| | - Chantal Brosseau
- Centre SÈVE, Département de Biologie, Université de Sherbrooke, 2500 Boulevard de l'Université, Sherbrooke J1K 2R1, QC, Canada
| | - Maria Goretty Caamal Chan
- Centre SÈVE, Département de Biologie, Université de Sherbrooke, 2500 Boulevard de l'Université, Sherbrooke J1K 2R1, QC, Canada
| | - Silke Robatzek
- The Sainsbury Laboratory, Norwich Research Park, Norwich NR4 7UH, UK
| | - Peter Moffett
- Centre SÈVE, Département de Biologie, Université de Sherbrooke, 2500 Boulevard de l'Université, Sherbrooke J1K 2R1, QC, Canada
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29
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Rosas-Díaz T, Macho AP, Beuzón CR, Lozano-Durán R, Bejarano ER. The C2 Protein from the Geminivirus Tomato Yellow Leaf Curl Sardinia Virus Decreases Sensitivity to Jasmonates and Suppresses Jasmonate-Mediated Defences. PLANTS 2016; 5:plants5010008. [PMID: 27135228 PMCID: PMC4844413 DOI: 10.3390/plants5010008] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 01/11/2016] [Accepted: 01/11/2016] [Indexed: 12/30/2022]
Abstract
An increasing body of evidence points at a role of the plant hormones jasmonates (JAs) in determining the outcome of plant-virus interactions. Geminiviruses, small DNA viruses infecting a wide range of plant species worldwide, encode a multifunctional protein, C2, which is essential for full pathogenicity. The C2 protein has been shown to suppress the JA response, although the current view on the extent of this effect and the underlying molecular mechanisms is incomplete. In this work, we use a combination of exogenous hormone treatments, microarray analysis, and pathogen infections to analyze, in detail, the suppression of the JA response exerted by C2. Our results indicate that C2 specifically affects certain JA-induced responses, namely defence and secondary metabolism, and show that plants expressing C2 are more susceptible to pathogen attack. We propose a model in which C2 might interfere with the JA response at several levels.
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Affiliation(s)
- Tábata Rosas-Díaz
- Departamento de Biología Celular, Genética y Fisiología, Instituto de Hortofruticultura Subtropical y Mediterránea, Universidad de Málaga-Consejo Superior de Investigaciones Científicas, Campus de Teatinos, E-29071 Malaga, Spain.
- Shanghai Center for Plant Stress Biology (PSC), Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai 201602, China.
| | - Alberto P Macho
- Departamento de Biología Celular, Genética y Fisiología, Instituto de Hortofruticultura Subtropical y Mediterránea, Universidad de Málaga-Consejo Superior de Investigaciones Científicas, Campus de Teatinos, E-29071 Malaga, Spain.
- Shanghai Center for Plant Stress Biology (PSC), Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai 201602, China.
| | - Carmen R Beuzón
- Departamento de Biología Celular, Genética y Fisiología, Instituto de Hortofruticultura Subtropical y Mediterránea, Universidad de Málaga-Consejo Superior de Investigaciones Científicas, Campus de Teatinos, E-29071 Malaga, Spain.
| | - Rosa Lozano-Durán
- Departamento de Biología Celular, Genética y Fisiología, Instituto de Hortofruticultura Subtropical y Mediterránea, Universidad de Málaga-Consejo Superior de Investigaciones Científicas, Campus de Teatinos, E-29071 Malaga, Spain.
- Shanghai Center for Plant Stress Biology (PSC), Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, Shanghai 201602, China.
| | - Eduardo R Bejarano
- Departamento de Biología Celular, Genética y Fisiología, Instituto de Hortofruticultura Subtropical y Mediterránea, Universidad de Málaga-Consejo Superior de Investigaciones Científicas, Campus de Teatinos, E-29071 Malaga, Spain.
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30
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Narusaka M, Toyoda K, Shiraishi T, Iuchi S, Takano Y, Shirasu K, Narusaka Y. Leucine zipper motif in RRS1 is crucial for the regulation of Arabidopsis dual resistance protein complex RPS4/RRS1. Sci Rep 2016; 6:18702. [PMID: 26750751 PMCID: PMC4707544 DOI: 10.1038/srep18702] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 11/23/2015] [Indexed: 11/12/2022] Open
Abstract
Arabidopsis thaliana leucine-rich repeat-containing (NLR) proteins RPS4 and RRS1, known as dual resistance proteins, confer resistance to multiple pathogen isolates, such as the bacterial pathogens Pseudomonas syringae and Ralstonia solanacearum and the fungal pathogen Colletotrichum higginsianum. RPS4 is a typical Toll/interleukin 1 Receptor (TIR)-type NLR, whereas RRS1 is an atypical TIR-NLR that contains a leucine zipper (LZ) motif and a C-terminal WRKY domain. RPS4 and RRS1 are localised near each other in a head-to-head orientation. In this study, direct mutagenesis of the C-terminal LZ motif in RRS1 caused an autoimmune response and stunting in the mutant. Co-immunoprecipitation analysis indicated that full-length RPS4 and RRS1 are physically associated with one another. Furthermore, virus-induced gene silencing experiments showed that hypersensitive-like cell death triggered by RPS4/LZ motif-mutated RRS1 depends on EDS1. In conclusion, we suggest that the RRS1-LZ motif is crucial for the regulation of the RPS4/RRS1 complex.
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Affiliation(s)
- Mari Narusaka
- Research Institute for Biological Sciences Okayama, Okayama 716-1241, Japan
| | - Kazuhiro Toyoda
- Faculty of Agriculture, Okayama University, Okayama 700-8530, Japan
| | - Tomonori Shiraishi
- Research Institute for Biological Sciences Okayama, Okayama 716-1241, Japan
| | | | - Yoshitaka Takano
- Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Ken Shirasu
- RIKEN Centre for Sustainable Resource Science, Yokohama 230-0045, Japan
| | - Yoshihiro Narusaka
- Research Institute for Biological Sciences Okayama, Okayama 716-1241, Japan
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31
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Adlung N, Prochaska H, Thieme S, Banik A, Blüher D, John P, Nagel O, Schulze S, Gantner J, Delker C, Stuttmann J, Bonas U. Non-host Resistance Induced by the Xanthomonas Effector XopQ Is Widespread within the Genus Nicotiana and Functionally Depends on EDS1. FRONTIERS IN PLANT SCIENCE 2016; 7:1796. [PMID: 27965697 PMCID: PMC5127841 DOI: 10.3389/fpls.2016.01796] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 11/15/2016] [Indexed: 05/18/2023]
Abstract
Most Gram-negative plant pathogenic bacteria translocate effector proteins (T3Es) directly into plant cells via a conserved type III secretion system, which is essential for pathogenicity in susceptible plants. In resistant plants, recognition of some T3Es is mediated by corresponding resistance (R) genes or R proteins and induces effector triggered immunity (ETI) that often results in programmed cell death reactions. The identification of R genes and understanding their evolution/distribution bears great potential for the generation of resistant crop plants. We focus on T3Es from Xanthomonas campestris pv. vesicatoria (Xcv), the causal agent of bacterial spot disease on pepper and tomato plants. Here, 86 Solanaceae lines mainly of the genus Nicotiana were screened for phenotypical reactions after Agrobacterium tumefaciens-mediated transient expression of 21 different Xcv effectors to (i) identify new plant lines for T3E characterization, (ii) analyze conservation/evolution of putative R genes and (iii) identify promising plant lines as repertoire for R gene isolation. The effectors provoked different reactions on closely related plant lines indicative of a high variability and evolution rate of potential R genes. In some cases, putative R genes were conserved within a plant species but not within superordinate phylogenetical units. Interestingly, the effector XopQ was recognized by several Nicotiana spp. lines, and Xcv infection assays revealed that XopQ is a host range determinant in many Nicotiana species. Non-host resistance against Xcv and XopQ recognition in N. benthamiana required EDS1, strongly suggesting the presence of a TIR domain-containing XopQ-specific R protein in these plant lines. XopQ is a conserved effector among most xanthomonads, pointing out the XopQ-recognizing RxopQ as candidate for targeted crop improvement.
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Affiliation(s)
- Norman Adlung
- Department of Genetics, Institute for Biology, Martin Luther University Halle-WittenbergHalle, Germany
- *Correspondence: Norman Adlung
| | - Heike Prochaska
- Department of Genetics, Institute for Biology, Martin Luther University Halle-WittenbergHalle, Germany
| | - Sabine Thieme
- Department of Genetics, Institute for Biology, Martin Luther University Halle-WittenbergHalle, Germany
| | - Anne Banik
- Department of Genetics, Institute for Biology, Martin Luther University Halle-WittenbergHalle, Germany
| | - Doreen Blüher
- Department of Genetics, Institute for Biology, Martin Luther University Halle-WittenbergHalle, Germany
| | - Peter John
- Department of Genetics, Institute for Biology, Martin Luther University Halle-WittenbergHalle, Germany
| | - Oliver Nagel
- Department of Genetics, Institute for Biology, Martin Luther University Halle-WittenbergHalle, Germany
| | - Sebastian Schulze
- Department of Genetics, Institute for Biology, Martin Luther University Halle-WittenbergHalle, Germany
| | - Johannes Gantner
- Department of Genetics, Institute for Biology, Martin Luther University Halle-WittenbergHalle, Germany
| | - Carolin Delker
- Department of Crop Physiology, Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-WittenbergHalle, Germany
| | - Johannes Stuttmann
- Department of Genetics, Institute for Biology, Martin Luther University Halle-WittenbergHalle, Germany
| | - Ulla Bonas
- Department of Genetics, Institute for Biology, Martin Luther University Halle-WittenbergHalle, Germany
- Ulla Bonas
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32
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Odokonyero D, Mendoza MR, Alvarado VY, Zhang J, Wang X, Scholthof HB. Transgenic down-regulation of ARGONAUTE2 expression in Nicotiana benthamiana interferes with several layers of antiviral defenses. Virology 2015; 486:209-18. [PMID: 26454664 DOI: 10.1016/j.virol.2015.09.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Revised: 09/15/2015] [Accepted: 09/16/2015] [Indexed: 11/24/2022]
Abstract
The present study aimed to analyze the contribution of Nicotiana benthamiana ARGONAUTE2 (NbAGO2) to its antiviral response against different viruses. For this purpose, dsRNA hairpin technology was used to reduce NbAGO2 expression in transgenic plants as verified with RT-PCR. This reduction was specific because the expression of other NbAGOs was not affected, and did not cause obvious developmental defects under normal growth conditions. Inoculation of transgenic plants with an otherwise silencing-sensitive GFP-expressing Tomato bushy stunt virus (TBSV) variant resulted in high GFP accumulation because antiviral silencing was compromised. These transgenic plants also exhibited accelerated spread and/or enhanced susceptibility and symptoms for TBSV mutants defective for P19 or coat protein expression, other tombusviruses, Tobacco mosaic virus, and Potato virus X; but not noticeably for Foxtail mosaic virus. These findings support the notion that NbAGO2 in N. benthamiana can contribute to antiviral defense at different levels.
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Affiliation(s)
- Denis Odokonyero
- Department of Plant Pathology & Microbiology, Texas A&M University, College Station, TX, USA
| | - Maria R Mendoza
- Department of Plant Pathology & Microbiology, Texas A&M University, College Station, TX, USA
| | - Veria Y Alvarado
- Department of Plant Pathology & Microbiology, Texas A&M University, College Station, TX, USA
| | - Jiantao Zhang
- Department of Plant Pathology & Microbiology, Texas A&M AgriLife Research, Weslaco, TX, USA
| | - Xiaofeng Wang
- Department of Plant Pathology & Microbiology, Texas A&M AgriLife Research, Weslaco, TX, USA
| | - Herman B Scholthof
- Department of Plant Pathology & Microbiology, Texas A&M University, College Station, TX, USA.
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Brosseau C, Moffett P. Functional and Genetic Analysis Identify a Role for Arabidopsis ARGONAUTE5 in Antiviral RNA Silencing. THE PLANT CELL 2015; 27:1742-54. [PMID: 26023161 PMCID: PMC4498209 DOI: 10.1105/tpc.15.00264] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Revised: 04/23/2015] [Accepted: 05/08/2015] [Indexed: 05/05/2023]
Abstract
RNA silencing functions as an antiviral defense through the action of DICER-like (DCL) and ARGONAUTE (AGO) proteins. In turn, plant viruses have evolved strategies to counteract this defense mechanism, including the expression of suppressors of RNA silencing. Potato virus X (PVX) does not systemically infect Arabidopsis thaliana Columbia-0, but is able to do so effectively in mutants lacking at least two of the four Arabidopsis DCL proteins. PVX can also infect Arabidopsis ago2 mutants, albeit less effectively than double DCL mutants, suggesting that additional AGO proteins may mediate anti-viral defenses. Here we show, using functional assays, that all Arabidopsis AGO proteins have the potential to target PVX lacking its viral suppressor of RNA silencing (VSR), P25, but that only AGO2 and AGO5 are able to target wild-type PVX. However, P25 directly affects only a small subset of AGO proteins, and we present evidence indicating that its protective effect is mediated by precluding AGO proteins from accessing viral RNA, as well as by directly inhibiting the RNA silencing machinery. In agreement with functional assays, we show that Potexvirus infection induces AGO5 expression and that both AGO2 and AGO5 are required for full restriction of PVX infection in systemic tissues of Arabidopsis.
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Affiliation(s)
- Chantal Brosseau
- Centre SÈVE, Département de Biologie, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada
| | - Peter Moffett
- Centre SÈVE, Département de Biologie, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada
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Lee HA, Yeom SI. Plant NB-LRR proteins: tightly regulated sensors in a complex manner. Brief Funct Genomics 2015; 14:233-42. [DOI: 10.1093/bfgp/elv012] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kumar D, Kirti PB. Pathogen-induced SGT1 of Arachis diogoi induces cell death and enhanced disease resistance in tobacco and peanut. PLANT BIOTECHNOLOGY JOURNAL 2015; 13:73-84. [PMID: 25236372 DOI: 10.1111/pbi.12237] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Revised: 07/01/2014] [Accepted: 07/02/2014] [Indexed: 06/03/2023]
Abstract
We have identified a transcript derived fragment (TDF) corresponding to SGT1 in a study of differential gene expression on the resistant wild peanut, Arachis diogoi, upon challenge from the late leaf spot pathogen, Phaeoisariopsis personata, and cloned its full-length cDNA followed by subsequent validation through q-PCR. Sodium nitroprusside, salicylic acid, ethephon and methyl jasmonate induced the expression of AdSGT1, while the treatment with abscisic acid did not elicit its up-regulation. AdSGT1 is localized to both nucleus and cytoplasm. Its overexpression induced hypersensitive-like cell death in tobacco under transient conditional expression using the estradiol system, and this conditional expression of AdSGT1 was also associated with the up-regulation of NtHSR203J, HMGR and HIN1, which have been shown to be associated with hypersensitive response in tobacco in earlier studies. Expression of the cDNA in a susceptible cultivated peanut variety enhanced its resistance against the late leaf spot pathogen, Phaeoisariopsis personata, while the heterologous expression in tobacco enhanced its resistance against Phytophthora parasitica var. nicotianae, Alternaria alternata var. nicotianae and Rhizoctonia solani. Constitutive expression in peanut was associated with the co-expression of resistance-related genes, CC-NB-LRR and some protein kinases.
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Affiliation(s)
- Dilip Kumar
- Department of Plant Sciences, University of Hyderabad, Hyderabad, India
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36
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Gao F, Dai R, Pike SM, Qiu W, Gassmann W. Functions of EDS1-like and PAD4 genes in grapevine defenses against powdery mildew. PLANT MOLECULAR BIOLOGY 2014; 86:381-93. [PMID: 25107649 DOI: 10.1007/s11103-014-0235-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Accepted: 08/01/2014] [Indexed: 05/20/2023]
Abstract
The molecular interactions between grapevine and the obligate biotrophic fungus Erysiphe necator are not understood in depth. One reason for this is the recalcitrance of grapevine to genetic modifications. Using defense-related Arabidopsis mutants that are susceptible to pathogens, we were able to analyze key components in grapevine defense responses. We have examined the functions of defense genes associated with the salicylic acid (SA) pathway, including ENHANCED DISEASE SUSCEPTIBILITY 1 (EDS1), EDS1-LIKE 2 (EDL2), EDL5 and PHYTOALEXIN DEFICIENT 4 (PAD4) of two grapevine species, Vitis vinifera cv. Cabernet Sauvignon, which is susceptible to E. necator, and V. aestivalis cv. Norton, which is resistant. Both VaEDS1 and VvEDS1 were previously found to functionally complement the Arabidopsis eds1-1 mutant. Here we show that the promoters of both VaEDS1 and VvEDS1 were induced by SA, indicating that the heightened defense of Norton is related to its high SA level. Other than Va/VvEDS1, only VaEDL2 complemented Arabidopsis eds1-1, whereas Va/VvPAD4 did not complement Arabidopsis pad4-1. Bimolecular fluorescence complementation results indicated that Vitis EDS1 and EDL2 proteins interact with Vitis PAD4 and AtPAD4, suggesting that Vitis EDS1/EDL2 forms a complex with PAD4 to confer resistance, as is known from Arabidopsis. However, Vitis EDL5 and PAD4 did not interact with Arabidopsis EDS1 or PAD4, correlating with their inability to function in Arabidopsis. Together, our study suggests a more complicated EDS1/PAD4 module in grapevine and provides insight into molecular mechanisms that determine disease resistance levels in Vitis species native to the North American continent.
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Affiliation(s)
- Fei Gao
- Division of Plant Sciences, C.S. Bond Life Sciences Center and Interdisciplinary Plant Group, University of Missouri, 371C Life Sciences Center, Columbia, MO, 65211-7310, USA
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37
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Vega-Arreguín JC, Jalloh A, Bos JI, Moffett P. Recognition of an Avr3a homologue plays a major role in mediating nonhost resistance to Phytophthora capsici in Nicotiana species. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2014; 27:770-80. [PMID: 24725207 DOI: 10.1094/mpmi-01-14-0014-r] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Nonhost resistance is a commonly occurring phenomenon wherein all accessions or cultivars of a plant species are resistant to all strains of a pathogen species and is likely the manifestation of multiple molecular mechanisms. Phytophthora capsici is a soil-borne oomycete that causes Phytophthora blight disease in many solanaceous and cucurbitaceous plants worldwide. Interest in P. capsici has increased considerably with the sequencing of its genome and its increasing occurrence in multiple crops. However, molecular interactions between P. capsici and both its hosts and its nonhosts are poorly defined. We show here that tobacco (Nicotiana tabacum) acts like a nonhost for P. capsici and responds to P. capsici infection with a hypersensitive response (HR). Furthermore, we have found that a P. capsici Avr3a-like gene (PcAvr3a1) encoding a putative RXLR effector protein produces a HR upon transient expression in tobacco and several other Nicotiana species. This HR response correlated with resistance in 19 of 23 Nicotiana species and accessions tested, and knock-down of PcAvr3a1 expression by host-induced gene silencing allowed infection of resistant tobacco. Our results suggest that many Nicotiana species have the capacity to recognize PcAvr3a1 via the products of endogenous disease resistance (R) genes and that this R gene-mediated response is a major component of nonhost resistance to P. capsici.
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38
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Padmanabhan MS, Dinesh-Kumar SP. The conformational and subcellular compartmental dance of plant NLRs during viral recognition and defense signaling. Curr Opin Microbiol 2014; 20:55-61. [PMID: 24906192 DOI: 10.1016/j.mib.2014.05.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 05/02/2014] [Accepted: 05/11/2014] [Indexed: 11/25/2022]
Abstract
Plant innate immune response against viruses utilizes intracellular Nucleotide Binding domain Leucine Rich Repeat (NLR) class of receptors. NLRs recognize different viral proteins termed elicitors and initiate diverse signaling processes that induce programmed cell death (PCD) in infected cells and restrict virus spread. In this review we describe the recent advances made in the study of plant NLRs that detect viruses. We describe some of the physical and functional interactions these NLRs undertake. We elaborate on the intra-molecular and homotypic association of NLRs that function in self-regulation and activation. Nuclear role for some viral NLRs is discussed as well as the emerging importance of the RNAi pathway in regulating the NLR family.
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Affiliation(s)
- Meenu S Padmanabhan
- Department of Plant Biology and The Genome Center, College of Biological Sciences, University of California, Davis, CA 95616, United States.
| | - Savithramma P Dinesh-Kumar
- Department of Plant Biology and The Genome Center, College of Biological Sciences, University of California, Davis, CA 95616, United States.
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39
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Su X, Qi X, Cheng H. Molecular cloning and characterization of enhanced disease susceptibility 1 (EDS1) from Gossypium barbadense. Mol Biol Rep 2014; 41:3821-8. [PMID: 24570021 DOI: 10.1007/s11033-014-3248-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Accepted: 02/07/2014] [Indexed: 11/24/2022]
Abstract
Arabidopsis enhanced disease susceptibility 1 (EDS1) plays an important role in plant defense against biotrophic and necrotrophic pathogens. The necrotrophic pathogen Verticillium dahliae infection of Gossypium barbadense could lead to Verticillium wilt which seriously reduces the cotton production. Here, we cloned and characterized a G. barbadense homolog of EDS1, designated as GbEDS1. The full-length cDNA of the GbEDS1 gene was obtained by the technique of rapid-amplification of cDNA ends. The open reading frame of the GbEDS1 gene was 1,647 bp long and encoded a protein of 548 amino acids residues. Comparison of the cDNA and genomic DNA sequence of GbEDS1 indicated that this gene contained a single intron and two exons. Like other EDS1s, GbEDS1 contained a conserved N-terminal lipase domain and an EDS1-specific KNEDT motif. Subcellular localization assay revealed that GbEDS1-green fluorescence protein fusion protein was localized in both cytosol and nucleus. Interestingly, the transcript levels of GbEDS1 were dramatically increased in response to pathogen V. dahliae infection. To investigate the role of GbEDS1 in plant resistance against V. dahliae, a conserved fragment derived from GbEDS1 was used to knockdown the endogenous EDS1 in Nicotiana benthamiana by heterologous virus-induced gene silencing. Our data showed that silencing of NbEDS1 resulted in increased susceptibility to V. dahliae infection in N. benthamiana, suggesting a possible involvement of the novelly isolated GbEDS1 in the regulation of plant defense against V. dahliae.
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Affiliation(s)
- Xiaofeng Su
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
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40
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Harris CJ, Slootweg EJ, Goverse A, Baulcombe DC. Stepwise artificial evolution of a plant disease resistance gene. Proc Natl Acad Sci U S A 2013; 110:21189-94. [PMID: 24324167 PMCID: PMC3876221 DOI: 10.1073/pnas.1311134110] [Citation(s) in RCA: 95] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Genes encoding plant nucleotide-binding leucine-rich repeat (NB-LRR) proteins confer dominant resistance to diverse pathogens. The wild-type potato NB-LRR protein Rx confers resistance against a single strain of potato virus X (PVX), whereas LRR mutants protect against both a second PVX strain and the distantly related poplar mosaic virus (PopMV). In one of the Rx mutants there was a cost to the broad-spectrum resistance because the response to PopMV was transformed from a mild disease on plants carrying wild-type Rx to a trailing necrosis that killed the plant. To explore the use of secondary mutagenesis to eliminate this cost of broad-spectrum resistance, we performed random mutagenesis of the N-terminal domains of this broad-recognition version of Rx and isolated four mutants with a stronger response against the PopMV coat protein due to enhanced activation sensitivity. These mutations are located close to the nucleotide-binding pocket, a highly conserved structure that likely controls the "switch" between active and inactive NB-LRR conformations. Stable transgenic plants expressing one of these versions of Rx are resistant to the strains of PVX and the PopMV that previously caused trailing necrosis. We conclude from this work that artificial evolution of NB-LRR disease resistance genes in crops can be enhanced by modification of both activation and recognition phases, to both accentuate the positive and eliminate the negative aspects of disease resistance.
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Affiliation(s)
- C. Jake Harris
- Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom; and
| | - Erik J. Slootweg
- Laboratory of Nematology, Department of Plant Sciences, Wageningen University, 6708 PB, Wageningen, The Netherlands
| | - Aska Goverse
- Laboratory of Nematology, Department of Plant Sciences, Wageningen University, 6708 PB, Wageningen, The Netherlands
| | - David C. Baulcombe
- Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom; and
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41
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Hoser R, Żurczak M, Lichocka M, Zuzga S, Dadlez M, Samuel MA, Ellis BE, Stuttmann J, Parker JE, Hennig J, Krzymowska M. Nucleocytoplasmic partitioning of tobacco N receptor is modulated by SGT1. THE NEW PHYTOLOGIST 2013; 200:158-171. [PMID: 23731343 DOI: 10.1111/nph.12347] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Accepted: 04/29/2013] [Indexed: 05/18/2023]
Abstract
SGT1 (Suppressor of G2 allele of SKP1) is required to maintain plant disease Resistance (R) proteins with Nucleotide-Binding (NB) and Leucine-Rich Repeat (LRR) domains in an inactive but signaling-competent state. SGT1 is an integral component of a multi-protein network that includes RACK1, Rac1, RAR1, Rboh, HSP90 and HSP70, and in rice the Mitogen-Activated Protein Kinase (MAPK), OsMAPK6. Tobacco (Nicotiana tabacum) N protein, which belongs to the Toll-Interleukin Receptor (TIR)-NB-LRR class of R proteins, confers resistance to Tobacco Mosaic Virus (TMV). Following transient expression in planta, we analyzed the functional relationship between SGT1, SIPK - a tobacco MAPK6 ortholog - and N, using mass spectrometry, confocal microscopy and pathogen assays. Here, we show that tobacco SGT1 undergoes specific phosphorylation in a canonical MAPK target-motif by SIPK. Mutation of this motif to mimic SIPK phosphorylation leads to an increased proportion of cells displaying SGT1 nuclear accumulation and impairs N-mediated resistance to TMV, as does phospho-null substitution at the same residue. Forced nuclear localization of SGT1 causes N to be confined to nuclei. Our data suggest that one mode of regulating nucleocytoplasmic partitioning of R proteins is by maintaining appropriate levels of SGT1 phosphorylation catalyzed by plant MAPK.
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Affiliation(s)
- Rafał Hoser
- Institute of Biochemistry and Biophysics PAS, Pawinskiego 5a, 02-106, Warsaw, Poland
| | - Marek Żurczak
- Institute of Biochemistry and Biophysics PAS, Pawinskiego 5a, 02-106, Warsaw, Poland
| | - Małgorzata Lichocka
- Institute of Biochemistry and Biophysics PAS, Pawinskiego 5a, 02-106, Warsaw, Poland
| | - Sabina Zuzga
- Institute of Biochemistry and Biophysics PAS, Pawinskiego 5a, 02-106, Warsaw, Poland
| | - Michal Dadlez
- Institute of Biochemistry and Biophysics PAS, Pawinskiego 5a, 02-106, Warsaw, Poland
- Biology Department, Institute of Genetics and Biotechnology, Warsaw University, Pawinskiego 5a, 02-106, Warsaw, Poland
| | - Marcus A Samuel
- Department of Biological Sciences, University of Calgary, 2500 University Dr NW Calgary, Alberta, T2N 1N4, Canada
| | - Brian E Ellis
- Michael Smith Laboratories, University of British Columbia, 2185 East Mall, Vancouver, BC V6T 1Z4, Canada
| | - Johannes Stuttmann
- Department of Plant-Microbe Interactions, Max-Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829, Cologne, Germany
| | - Jane E Parker
- Department of Plant-Microbe Interactions, Max-Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829, Cologne, Germany
| | - Jacek Hennig
- Institute of Biochemistry and Biophysics PAS, Pawinskiego 5a, 02-106, Warsaw, Poland
| | - Magdalena Krzymowska
- Institute of Biochemistry and Biophysics PAS, Pawinskiego 5a, 02-106, Warsaw, Poland
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Rodewald J, Trognitz B. Solanum resistance genes against Phytophthora infestans and their corresponding avirulence genes. MOLECULAR PLANT PATHOLOGY 2013; 14:740-57. [PMID: 23710878 PMCID: PMC6638693 DOI: 10.1111/mpp.12036] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Resistance genes against Phytophthora infestans (Rpi genes), the most important potato pathogen, are still highly valued in the breeding of Solanum spp. for enhanced resistance. The Rpi genes hitherto explored are localized most often in clusters, which are similar between the diverse Solanum genomes. Their distribution is not independent of late maturity traits. This review provides a summary of the most recent important revelations on the genomic position and cloning of Rpi genes, and the structure, associations, mode of action and activity spectrum of Rpi and corresponding avirulence (Avr) proteins. Practical implications for research into and application of Rpi genes are deduced and combined with an outlook on approaches to address remaining issues and interesting questions. It is evident that the potential of Rpi genes has not been exploited fully.
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Affiliation(s)
- Jan Rodewald
- Department of Health and Environment, Austrian Institute of Technology, Konrad-Lorenz-Straße 24, 3430, Tulln, Austria.
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43
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Abstract
Virus-induced gene silencing (VIGS) is a technology that exploits an RNA-mediated antiviral defense mechanism and which has great potential for use in plant reverse genetics. Recently, whole-genome studies and gene sequencing in plants have produced a massive amount of sequence information. A major challenge for plant biologists is to convert this sequence information into functional information. In this study, we demonstrate that VIGS can be used to determine gene functions in strawberry and that it is a powerful new tool for studying fruit ripening. The ABA synthetic gene FaNCED1, which can promote strawberry fruit ripening, was used as the reporter gene. In this chapter, we describe the use of TRV-mediated VIGS in strawberry fruit.
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44
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Tang F, Yang S, Gao M, Zhu H. Alternative splicing is required for RCT1-mediated disease resistance in Medicago truncatula. PLANT MOLECULAR BIOLOGY 2013; 82:367-74. [PMID: 23657790 DOI: 10.1007/s11103-013-0068-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Accepted: 04/25/2013] [Indexed: 05/12/2023]
Abstract
RCT1 is a TIR-NBS-LRR-type resistance (R) gene in Medicago truncatula that confers resistance to multiple races of Colletotrichum trifolii, a hemi-biotrophic fungal pathogen that causes anthracnose disease in Medicago and other closely related legumes. RCT1 undergoes alternative splicing at both coding and 3'-untranslated regions, thereby producing multiple transcript variants in its expression profile. Alternative splicing of RCT1 in the coding region results from the retention of intron 4. Because intron 4 lies downstream of the LRR-encoding exons and contains an in-frame stop codon, the alternative transcript is predicted to encode a truncated protein consisting of the entire portion of the TIR, NBS, and LRR domains but lacks the C-terminal domain of the full-length RCT1 protein encoded by the regular transcript. Here we provide evidence that the RCT1-mediated disease resistance requires the combined presence of the regular and alternative transcripts. Neither the regular nor the alternative RCT1 transcript alone is sufficient to confer resistance against the pathogen. This study, in addition to the reports on the tobacco N and Arabidopsis RPS4 genes, adds another significant example showing the involvement of alternative splicing in R gene-mediated plant immunity.
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Affiliation(s)
- Fang Tang
- Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY 40546, USA
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45
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Sansregret R, Dufour V, Langlois M, Daayf F, Dunoyer P, Voinnet O, Bouarab K. Extreme resistance as a host counter-counter defense against viral suppression of RNA silencing. PLoS Pathog 2013; 9:e1003435. [PMID: 23785291 PMCID: PMC3681747 DOI: 10.1371/journal.ppat.1003435] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Accepted: 05/06/2013] [Indexed: 01/02/2023] Open
Abstract
RNA silencing mediated by small RNAs (sRNAs) is a conserved regulatory process with key antiviral and antimicrobial roles in eukaryotes. A widespread counter-defensive strategy of viruses against RNA silencing is to deploy viral suppressors of RNA silencing (VSRs), epitomized by the P19 protein of tombusviruses, which sequesters sRNAs and compromises their downstream action. Here, we provide evidence that specific Nicotiana species are able to sense and, in turn, antagonize the effects of P19 by activating a highly potent immune response that protects tissues against Tomato bushy stunt virus infection. This immunity is salicylate- and ethylene-dependent, and occurs without microscopic cell death, providing an example of "extreme resistance" (ER). We show that the capacity of P19 to bind sRNA, which is mandatory for its VSR function, is also necessary to induce ER, and that effects downstream of P19-sRNA complex formation are the likely determinants of the induced resistance. Accordingly, VSRs unrelated to P19 that also bind sRNA compromise the onset of P19-elicited defense, but do not alter a resistance phenotype conferred by a viral protein without VSR activity. These results show that plants have evolved specific responses against the damages incurred by VSRs to the cellular silencing machinery, a likely necessary step in the never-ending molecular arms race opposing pathogens to their hosts.
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Affiliation(s)
- Raphaël Sansregret
- Centre SEVE, Département de Biologie, Faculté des Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Vanessa Dufour
- Centre SEVE, Département de Biologie, Faculté des Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Mathieu Langlois
- Centre SEVE, Département de Biologie, Faculté des Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Fouad Daayf
- Department of Plant Science, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Patrice Dunoyer
- Institut de Biologie Moléculaire des Plantes du CNRS, Université de Strasbourg, Strasbourg, France
| | - Olivier Voinnet
- Institut de Biologie Moléculaire des Plantes du CNRS, Université de Strasbourg, Strasbourg, France
- Department of Biology, Swiss Federal Institute of Technology (ETH), Zurich, Switzerland
| | - Kamal Bouarab
- Centre SEVE, Département de Biologie, Faculté des Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
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Deng X, Kelloniemi J, Haikonen T, Vuorinen AL, Elomaa P, Teeri TH, Valkonen JPT. Modification of Tobacco rattle virus RNA1 to serve as a VIGS vector reveals that the 29K movement protein is an RNA silencing suppressor of the virus. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2013; 26:503-14. [PMID: 23360458 DOI: 10.1094/mpmi-12-12-0280-r] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Tobacco rattle virus (TRV) has a bipartite, positive-sense single-stranded RNA genome and is widely used for virus-induced gene silencing (VIGS) in plants. RNA1 of TRV that lacks the gene for the cysteine-rich 16K silencing-suppression protein infects plants systemically in the absence of RNA2. Here, we attempted to engineer RNA1 for use as a VIGS vector by inserting heterologous gene fragments to replace 16K. The RNA1 vector systemically silenced the phytoene desaturase (PDS) gene, although less efficiently than when the original VIGS vector system was used, which consists of wild-type RNA1 and engineered RNA2 carrying the heterologous gene. Infectious RNA1 mutants with a dysfunctional 16K suppressed silencing and enhanced transgene expression in green fluorescent protein-transgenic Nicotiana benthamiana following inoculation by agroinfiltration, unlike mutants that also lacked 29K, a movement protein (MP) gene. The 30K MP gene of Tobacco mosaic virus complemented in cis the movement defect but not the silencing suppression functions of TRV 29K. Silencing suppression by 29K occurred in the context of RNA1 replication but not in an agroinfiltration assay which tested 29K alone for suppression of sense-mediated silencing. Both 29K and 16K were needed to avoid necrotic symptoms in RNA1-infected N. benthamiana. The results shed new light on virulence factors of TRV.
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Affiliation(s)
- Xianbao Deng
- Department of Agricultural Sciences, University of Helsinki, Finland
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Zheng ZL, Zhao Y. Transcriptome comparison and gene coexpression network analysis provide a systems view of citrus response to 'Candidatus Liberibacter asiaticus' infection. BMC Genomics 2013; 14:27. [PMID: 23324561 PMCID: PMC3577516 DOI: 10.1186/1471-2164-14-27] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2012] [Accepted: 01/09/2013] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Huanglongbing (HLB) is arguably the most destructive disease for the citrus industry. HLB is caused by infection of the bacterium, Candidatus Liberibacter spp. Several citrus GeneChip studies have revealed thousands of genes that are up- or down-regulated by infection with Ca. Liberibacter asiaticus. However, whether and how these host genes act to protect against HLB remains poorly understood. RESULTS As a first step towards a mechanistic view of citrus in response to the HLB bacterial infection, we performed a comparative transcriptome analysis and found that a total of 21 Probesets are commonly up-regulated by the HLB bacterial infection. In addition, a number of genes are likely regulated specifically at early, late or very late stages of the infection. Furthermore, using Pearson correlation coefficient-based gene coexpression analysis, we constructed a citrus HLB response network consisting of 3,507 Probesets and 56,287 interactions. Genes involved in carbohydrate and nitrogen metabolic processes, transport, defense, signaling and hormone response were overrepresented in the HLB response network and the subnetworks for these processes were constructed. Analysis of the defense and hormone response subnetworks indicates that hormone response is interconnected with defense response. In addition, mapping the commonly up-regulated HLB responsive genes into the HLB response network resulted in a core subnetwork where transport plays a key role in the citrus response to the HLB bacterial infection. Moreover, analysis of a phloem protein subnetwork indicates a role for this protein and zinc transporters or zinc-binding proteins in the citrus HLB defense response. CONCLUSION Through integrating transcriptome comparison and gene coexpression network analysis, we have provided for the first time a systems view of citrus in response to the Ca. Liberibacter spp. infection causing HLB.
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Affiliation(s)
- Zhi-Liang Zheng
- Plant Nutrient Signaling and Fruit Quality Improvement Laboratory, Citrus Research Institute & College of Horticulture and Landscape Architecture, Southwest University, Beibei, Chongqing 400712, China.
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Postma WJ, Slootweg EJ, Rehman S, Finkers-Tomczak A, Tytgat TO, van Gelderen K, Lozano-Torres JL, Roosien J, Pomp R, van Schaik C, Bakker J, Goverse A, Smant G. The effector SPRYSEC-19 of Globodera rostochiensis suppresses CC-NB-LRR-mediated disease resistance in plants. PLANT PHYSIOLOGY 2012; 160:944-54. [PMID: 22904163 PMCID: PMC3461567 DOI: 10.1104/pp.112.200188] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Accepted: 08/14/2012] [Indexed: 05/04/2023]
Abstract
The potato cyst nematode Globodera rostochiensis invades roots of host plants where it transforms cells near the vascular cylinder into a permanent feeding site. The host cell modifications are most likely induced by a complex mixture of proteins in the stylet secretions of the nematodes. Resistance to nematodes conferred by nucleotide-binding-leucine-rich repeat (NB-LRR) proteins usually results in a programmed cell death in and around the feeding site, and is most likely triggered by the recognition of effectors in stylet secretions. However, the actual role of these secretions in the activation and suppression of effector-triggered immunity is largely unknown. Here we demonstrate that the effector SPRYSEC-19 of G. rostochiensis physically associates in planta with the LRR domain of a member of the SW5 resistance gene cluster in tomato (Lycopersicon esculentum). Unexpectedly, this interaction did not trigger defense-related programmed cell death and resistance to G. rostochiensis. By contrast, agroinfiltration assays showed that the coexpression of SPRYSEC-19 in leaves of Nicotiana benthamiana suppresses programmed cell death mediated by several coiled-coil (CC)-NB-LRR immune receptors. Furthermore, SPRYSEC-19 abrogated resistance to Potato virus X mediated by the CC-NB-LRR resistance protein Rx1, and resistance to Verticillium dahliae mediated by an unidentified resistance in potato (Solanum tuberosum). The suppression of cell death and disease resistance did not require a physical association of SPRYSEC-19 and the LRR domains of the CC-NB-LRR resistance proteins. Altogether, our data demonstrated that potato cyst nematodes secrete effectors that enable the suppression of programmed cell death and disease resistance mediated by several CC-NB-LRR proteins in plants.
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Affiliation(s)
- Wiebe J. Postma
- Laboratory of Nematology, Wageningen University, 6700 ES Wageningen, The Netherlands (W.J.P., E.J.S., S.R., A.F.-T., T.O.G.T., K.v.G., J.L.L.-T., J.R., R.P., C.v.S., J.B., A.G., G.S.); and Centre for BioSystems Genomics, 6708 PB Wageningen, The Netherlands (W.J.P., R.P., J.B., A.G., G.S.)
| | - Erik J. Slootweg
- Laboratory of Nematology, Wageningen University, 6700 ES Wageningen, The Netherlands (W.J.P., E.J.S., S.R., A.F.-T., T.O.G.T., K.v.G., J.L.L.-T., J.R., R.P., C.v.S., J.B., A.G., G.S.); and Centre for BioSystems Genomics, 6708 PB Wageningen, The Netherlands (W.J.P., R.P., J.B., A.G., G.S.)
| | | | - Anna Finkers-Tomczak
- Laboratory of Nematology, Wageningen University, 6700 ES Wageningen, The Netherlands (W.J.P., E.J.S., S.R., A.F.-T., T.O.G.T., K.v.G., J.L.L.-T., J.R., R.P., C.v.S., J.B., A.G., G.S.); and Centre for BioSystems Genomics, 6708 PB Wageningen, The Netherlands (W.J.P., R.P., J.B., A.G., G.S.)
| | | | | | - Jose L. Lozano-Torres
- Laboratory of Nematology, Wageningen University, 6700 ES Wageningen, The Netherlands (W.J.P., E.J.S., S.R., A.F.-T., T.O.G.T., K.v.G., J.L.L.-T., J.R., R.P., C.v.S., J.B., A.G., G.S.); and Centre for BioSystems Genomics, 6708 PB Wageningen, The Netherlands (W.J.P., R.P., J.B., A.G., G.S.)
| | - Jan Roosien
- Laboratory of Nematology, Wageningen University, 6700 ES Wageningen, The Netherlands (W.J.P., E.J.S., S.R., A.F.-T., T.O.G.T., K.v.G., J.L.L.-T., J.R., R.P., C.v.S., J.B., A.G., G.S.); and Centre for BioSystems Genomics, 6708 PB Wageningen, The Netherlands (W.J.P., R.P., J.B., A.G., G.S.)
| | - Rikus Pomp
- Laboratory of Nematology, Wageningen University, 6700 ES Wageningen, The Netherlands (W.J.P., E.J.S., S.R., A.F.-T., T.O.G.T., K.v.G., J.L.L.-T., J.R., R.P., C.v.S., J.B., A.G., G.S.); and Centre for BioSystems Genomics, 6708 PB Wageningen, The Netherlands (W.J.P., R.P., J.B., A.G., G.S.)
| | - Casper van Schaik
- Laboratory of Nematology, Wageningen University, 6700 ES Wageningen, The Netherlands (W.J.P., E.J.S., S.R., A.F.-T., T.O.G.T., K.v.G., J.L.L.-T., J.R., R.P., C.v.S., J.B., A.G., G.S.); and Centre for BioSystems Genomics, 6708 PB Wageningen, The Netherlands (W.J.P., R.P., J.B., A.G., G.S.)
| | - Jaap Bakker
- Laboratory of Nematology, Wageningen University, 6700 ES Wageningen, The Netherlands (W.J.P., E.J.S., S.R., A.F.-T., T.O.G.T., K.v.G., J.L.L.-T., J.R., R.P., C.v.S., J.B., A.G., G.S.); and Centre for BioSystems Genomics, 6708 PB Wageningen, The Netherlands (W.J.P., R.P., J.B., A.G., G.S.)
| | - Aska Goverse
- Laboratory of Nematology, Wageningen University, 6700 ES Wageningen, The Netherlands (W.J.P., E.J.S., S.R., A.F.-T., T.O.G.T., K.v.G., J.L.L.-T., J.R., R.P., C.v.S., J.B., A.G., G.S.); and Centre for BioSystems Genomics, 6708 PB Wageningen, The Netherlands (W.J.P., R.P., J.B., A.G., G.S.)
| | - Geert Smant
- Laboratory of Nematology, Wageningen University, 6700 ES Wageningen, The Netherlands (W.J.P., E.J.S., S.R., A.F.-T., T.O.G.T., K.v.G., J.L.L.-T., J.R., R.P., C.v.S., J.B., A.G., G.S.); and Centre for BioSystems Genomics, 6708 PB Wageningen, The Netherlands (W.J.P., R.P., J.B., A.G., G.S.)
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Lee J, Teitzel GM, Greenberg JT. SGT1b is required for HopZ3-mediated suppression of the epiphytic growth of Pseudomonas syringae on N. benthamiana. PLANT SIGNALING & BEHAVIOR 2012; 7:1129-31. [PMID: 22899059 PMCID: PMC3489644 DOI: 10.4161/psb.21319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Type III secreted effectors shape the potential of bacterial pathogens to cause disease on plants. Some effectors affect pathogen growth only in specific niches. For example, HopZ3 causes reduced epiphytic growth of Pseudomonas syringae strain B728a on Nicotiana benthamiana. This raises the question of whether genes important for effector-triggered disease resistance are needed for responses to effectors whose major effect is in the epiphytic niche. We report that SGT1b, a protein known to be important for defense activation, is essential for HopZ3-mediated suppression of PsyB728a epiphytic growth. SGT1b is required for HopZ3- and AvrB3-induced cell death in N. benthamiana plants that express the Pto resistance gene from tomato. We suggest that HopZ3 activates R gene mediated responses in N. benthamiana.
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Affiliation(s)
- Jiyoung Lee
- Department of Molecular Genetics and Cell Biology; The University of Chicago; Chicago, IL USA
| | - Gail M. Teitzel
- Department of Molecular Genetics and Cell Biology; The University of Chicago; Chicago, IL USA
| | - Jean T. Greenberg
- Department of Molecular Genetics and Cell Biology; The University of Chicago; Chicago, IL USA
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Anand A, Rojas CM, Tang Y, Mysore KS. Several components of SKP1/Cullin/F-box E3 ubiquitin ligase complex and associated factors play a role in Agrobacterium-mediated plant transformation. THE NEW PHYTOLOGIST 2012; 195:203-16. [PMID: 22486382 DOI: 10.1111/j.1469-8137.2012.04133.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
• Successful genetic transformation of plants by Agrobacterium tumefaciens requires the import of bacterial T-DNA and virulence proteins into the plant cell that eventually form a complex (T-complex). The essential components of the T-complex include the single stranded T-DNA, bacterial virulence proteins (VirD2, VirE2, VirE3 and VirF) and associated host proteins that facilitate the transfer and integration of T-DNA. The removal of the proteins from the T-complex is likely achieved by targeted proteolysis mediated by VirF and the plant ubiquitin proteasome complex. • We evaluated the involvement of the host SKP1/culin/F-box (SCF)-E3 ligase complex and its role in plant transformation. Gene silencing, mutant screening and gene expression studies suggested that the Arabidopsis homologs of yeast SKP1 (suppressor of kinetochore protein 1) protein, ASK1 and ASK2, are required for Agrobacterium-mediated plant transformation. • We identified the role for SGT1b (suppressor of the G2 allele of SKP1), an accessory protein that associates with SCF-complex, in plant transformation. We also report the differential expression of many genes that encode F-box motif containing SKP1-interacting proteins (SKIP) upon Agrobacterium infection. • We speculate that these SKIP genes could encode the plant specific F-box proteins that target the T-complex associated proteins for polyubiquitination and subsequent degradation by the 26S proteasome.
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Affiliation(s)
- Ajith Anand
- Plant Biology Division, The Samuel Roberts Noble Foundation, Ardmore, OK 73402, USA
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