151
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Nafisi M, Fimognari L, Sakuragi Y. Interplays between the cell wall and phytohormones in interaction between plants and necrotrophic pathogens. PHYTOCHEMISTRY 2015; 112:63-71. [PMID: 25496656 DOI: 10.1016/j.phytochem.2014.11.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Revised: 09/02/2014] [Accepted: 11/06/2014] [Indexed: 05/04/2023]
Abstract
The plant cell wall surrounds every cell in plants. During microbial infection, the cell wall provides a dynamic interface for interaction with necrotrophic phytopathogens as a rich source of carbohydrates for the growth of pathogens, as a physical barrier restricting the progression of the pathogens, and as an integrity sensory system that can activate intracellular signaling cascades and ultimately lead to a multitude of inducible host defense responses. Studies over the last decade have provided evidence of interplays between the cell wall and phytohormone signaling. This review summarizes the current state of knowledge about the cell wall-phytohormone interplays, with the focus on auxin, cytokinin, brassinosteroids, and abscisic acid, and discuss how they impact the outcome of plant-necrotrophic pathogen interaction.
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Affiliation(s)
- Majse Nafisi
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, Frederiksberg 1871, Denmark
| | - Lorenzo Fimognari
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, Frederiksberg 1871, Denmark
| | - Yumiko Sakuragi
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, Frederiksberg 1871, Denmark.
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152
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Arnaud D, Hwang I. A sophisticated network of signaling pathways regulates stomatal defenses to bacterial pathogens. MOLECULAR PLANT 2015; 8:566-81. [PMID: 25661059 DOI: 10.1016/j.molp.2014.10.012] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2014] [Revised: 10/25/2014] [Accepted: 10/26/2014] [Indexed: 05/03/2023]
Abstract
Guard cells are specialized cells forming stomatal pores at the leaf surface for gas exchanges between the plant and the atmosphere. Stomata have been shown to play an important role in plant defense as a part of the innate immune response. Plants actively close their stomata upon contact with microbes, thereby preventing pathogen entry into the leaves and the subsequent colonization of host tissues. In this review, we present current knowledge of molecular mechanisms and signaling pathways implicated in stomatal defenses, with particular emphasis on plant-bacteria interactions. Stomatal defense responses begin from the perception of pathogen-associated molecular patterns (PAMPs) and activate a signaling cascade involving the production of secondary messengers such as reactive oxygen species, nitric oxide, and calcium for the regulation of plasma membrane ion channels. The analyses on downstream molecular mechanisms implicated in PAMP-triggered stomatal closure have revealed extensive interplays among the components regulating hormonal signaling pathways. We also discuss the strategies deployed by pathogenic bacteria to counteract stomatal immunity through the example of the phytotoxin coronatine.
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Affiliation(s)
- Dominique Arnaud
- Department of Life Sciences, POSTECH Biotech Center, Pohang University of Science and Technology, Pohang 790-784, Korea.
| | - Ildoo Hwang
- Department of Life Sciences, POSTECH Biotech Center, Pohang University of Science and Technology, Pohang 790-784, Korea
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153
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Ramegowda V, Senthil-Kumar M. The interactive effects of simultaneous biotic and abiotic stresses on plants: mechanistic understanding from drought and pathogen combination. JOURNAL OF PLANT PHYSIOLOGY 2015; 176:47-54. [PMID: 25546584 DOI: 10.1016/j.jplph.2014.11.008] [Citation(s) in RCA: 232] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2014] [Revised: 11/29/2014] [Accepted: 11/29/2014] [Indexed: 05/20/2023]
Abstract
In nature, plants are simultaneously exposed to a combination of biotic and abiotic stresses that limit crop yields. Only recently, researchers have started understanding the molecular basis of combined biotic and abiotic stress interactions. Evidences suggest that under combined stress plants exhibit tailored physiological and molecular responses, in addition to several shared responses as part of their stress tolerance strategy. These tailored responses are suggested to occur only in plants exposed to simultaneous stresses and this information cannot be inferred from individual stress studies. In this review article, we provide update on the responses of plants to simultaneous biotic and abiotic stresses, in particular drought and pathogen. Simultaneous occurrence of drought and pathogen during plant growth provokes complex pathways controlled by different signaling events resulting in positive or negative impact of one stress over the other. Here, we summarize the effect of combined drought and pathogen infection on plants and highlight the tailored strategies adapted by plants. Besides, we enumerate the evidences from pathogen derived elicitors and ABA response studies for understanding simultaneous drought and pathogen tolerance.
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Affiliation(s)
- Venkategowda Ramegowda
- Department of Crop Physiology, University of Agricultural Sciences, Bangalore, 560065, India.
| | - Muthappa Senthil-Kumar
- National Institute of Plant Genome Research (NIPGR), Aruna Asaf Ali Marg, New Delhi 110067, India.
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154
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Wang JP, Munyampundu JP, Xu YP, Cai XZ. Phylogeny of Plant Calcium and Calmodulin-Dependent Protein Kinases (CCaMKs) and Functional Analyses of Tomato CCaMK in Disease Resistance. FRONTIERS IN PLANT SCIENCE 2015; 6:1075. [PMID: 26697034 PMCID: PMC4672059 DOI: 10.3389/fpls.2015.01075] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Accepted: 11/17/2015] [Indexed: 05/14/2023]
Abstract
Calcium and calmodulin-dependent protein kinase (CCaMK) is a member of calcium/calmodulin-dependent protein kinase superfamily and is essential to microbe- plant symbiosis. To date, the distribution of CCaMK gene in plants has not yet been completely understood, and its function in plant disease resistance remains unclear. In this study, we systemically identified the CCaMK genes in genomes of 44 plant species in Phytozome and analyzed the function of tomato CCaMK (SlCCaMK) in resistance to various pathogens. CCaMKs in 18 additional plant species were identified, yet the absence of CCaMK gene in green algae and cruciferous species was confirmed. Sequence analysis of full-length CCaMK proteins from 44 plant species demonstrated that plant CCaMKs are highly conserved across all domains. Most of the important regulatory amino acids are conserved throughout all sequences, with the only notable exception being observed in N-terminal autophosphorylation site corresponding to Ser 9 in the Medicago truncatula CCaMK. CCaMK gene structures are similar, mostly containing six introns with a phase profile of 200200 and the exception was only noticed at the first exons. Phylogenetic analysis demonstrated that CCaMK lineage is likely to have diverged early from a calcium-dependent protein kinase (CDPK) gene in the ancestor of all nonvascular plant species. The SlCCaMK gene was widely and differently responsive to diverse pathogenic stimuli. Furthermore, knock-down of SlCCaMK reduced tomato resistance to Sclerotinia sclerotiorum and Pseudomonas syringae pv. tomato (Pst) DC3000 and decreased H2O2 accumulation in response to Pst DC3000 inoculation. Our results reveal that SlCCaMK positively regulates disease resistance in tomato via promoting H2O2 accumulation. SlCCaMK is the first CCaMK gene proved to function in plant disease resistance.
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Affiliation(s)
- Ji-Peng Wang
- Institute of Biotechnology, College of Agriculture and Biotechnology, Zhejiang UniversityHangzhou, China
| | - Jean-Pierre Munyampundu
- Institute of Biotechnology, College of Agriculture and Biotechnology, Zhejiang UniversityHangzhou, China
| | - You-Ping Xu
- Centre of Analysis and Measurement, Zhejiang UniversityHangzhou, China
| | - Xin-Zhong Cai
- Institute of Biotechnology, College of Agriculture and Biotechnology, Zhejiang UniversityHangzhou, China
- State Key Laboratory of Rice Biology, Zhejiang UniversityHangzhou, China
- *Correspondence: Xin-Zhong Cai
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155
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Choi HW, Hwang BK. Molecular and cellular control of cell death and defense signaling in pepper. PLANTA 2015; 241:1-27. [PMID: 25252816 DOI: 10.1007/s00425-014-2171-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2014] [Accepted: 09/11/2014] [Indexed: 06/03/2023]
Abstract
Pepper (Capsicum annuum L.) provides a good experimental system for studying the molecular and functional genomics underlying the ability of plants to defend themselves against microbial pathogens. Cell death is a genetically programmed response that requires specific host cellular factors. Hypersensitive response (HR) is defined as rapid cell death in response to a pathogen attack. Pepper plants respond to pathogen attacks by activating genetically controlled HR- or disease-associated cell death. HR cell death, specifically in incompatible interactions between pepper and Xanthomonas campestris pv. vesicatoria, is mediated by the molecular genetics and biochemical machinery that underlie pathogen-induced cell death in plants. Gene expression profiles during the HR-like cell death response, virus-induced gene silencing and transient and transgenic overexpression approaches are used to isolate and identify HR- or disease-associated cell death genes in pepper plants. Reactive oxygen species, nitric oxide, cytosolic calcium ion and defense-related hormones such as salicylic acid, jasmonic acid, ethylene and abscisic acid are involved in the execution of pathogen-induced cell death in plants. In this review, we summarize recent molecular and cellular studies of the pepper cell death-mediated defense response, highlighting the signaling events of cell death in disease-resistant pepper plants. Comprehensive knowledge and understanding of the cellular functions of pepper cell death response genes will aid the development of novel practical approaches to enhance disease resistance in pepper, thereby helping to secure the future supply of safe and nutritious pepper plants worldwide.
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Affiliation(s)
- Hyong Woo Choi
- Laboratory of Molecular Plant Pathology, College of Life Sciences and Biotechnology, Korea University, Anam-dong, Sungbuk-ku, Seoul, 136-713, Republic of Korea
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156
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Großkinsky DK, van der Graaff E, Roitsch T. Abscisic Acid-Cytokinin Antagonism Modulates Resistance Against Pseudomonas syringae in Tobacco. PHYTOPATHOLOGY 2014; 104:1283-8. [PMID: 24941328 DOI: 10.1094/phyto-03-14-0076-r] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Phytohormones are known as essential regulators of plant defenses, with ethylene, jasmonic acid, and salicylic acid as the central immunity backbone, while other phytohormones have been demonstrated to interact with this. Only recently, a function of the classic phytohormone cytokinin in plant immunity has been described in Arabidopsis, rice, and tobacco. Although interactions of cytokinins with salicylic acid and auxin have been indicated, the complete network of cytokinin interactions with other immunity-relevant phytohormones is not yet understood. Therefore, we studied the interaction of kinetin and abscisic acid as a negative regulator of plant immunity to modulate resistance in tobacco against Pseudomonas syringae. By analyzing infection symptoms, pathogen proliferation, and accumulation of the phytoalexin scopoletin as a key mediator of kinetin-induced resistance in tobacco, antagonistic interaction of these phytohormones in plant immunity was identified. Kinetin reduced abscisic acid levels in tobacco, while increased abscisic acid levels by exogenous application or inhibition of abscisic acid catabolism by diniconazole neutralized kinetin-induced resistance. Based on these results, we conclude that reduction of abscisic acid levels by enhanced abscisic acid catabolism strongly contributes to cytokinin-mediated resistance effects. Thus, the identified cytokinin-abscisic acid antagonism is a novel regulatory mechanism in plant immunity.
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157
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Hok S, Allasia V, Andrio E, Naessens E, Ribes E, Panabières F, Attard A, Ris N, Clément M, Barlet X, Marco Y, Grill E, Eichmann R, Weis C, Hückelhoven R, Ammon A, Ludwig-Müller J, Voll LM, Keller H. The receptor kinase IMPAIRED OOMYCETE SUSCEPTIBILITY1 attenuates abscisic acid responses in Arabidopsis. PLANT PHYSIOLOGY 2014; 166:1506-18. [PMID: 25274985 PMCID: PMC4226379 DOI: 10.1104/pp.114.248518] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Accepted: 09/30/2014] [Indexed: 05/18/2023]
Abstract
In plants, membrane-bound receptor kinases are essential for developmental processes, immune responses to pathogens and the establishment of symbiosis. We previously identified the Arabidopsis (Arabidopsis thaliana) receptor kinase IMPAIRED OOMYCETE SUSCEPTIBILITY1 (IOS1) as required for successful infection with the downy mildew pathogen Hyaloperonospora arabidopsidis. We report here that IOS1 is also required for full susceptibility of Arabidopsis to unrelated (hemi)biotrophic filamentous oomycete and fungal pathogens. Impaired susceptibility in the absence of IOS1 appeared to be independent of plant defense mechanism. Instead, we found that ios1-1 plants were hypersensitive to the plant hormone abscisic acid (ABA), displaying enhanced ABA-mediated inhibition of seed germination, root elongation, and stomatal opening. These findings suggest that IOS1 negatively regulates ABA signaling in Arabidopsis. The expression of ABA-sensitive COLD REGULATED and RESISTANCE TO DESICCATION genes was diminished in Arabidopsis during infection. This effect on ABA signaling was alleviated in the ios1-1 mutant background. Accordingly, ABA-insensitive and ABA-hypersensitive mutants were more susceptible and resistant to oomycete infection, respectively, showing that the intensity of ABA signaling affects the outcome of downy mildew disease. Taken together, our findings suggest that filamentous (hemi)biotrophs attenuate ABA signaling in Arabidopsis during the infection process and that IOS1 participates in this pathogen-mediated reprogramming of the host.
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Affiliation(s)
- Sophie Hok
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Valérie Allasia
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Emilie Andrio
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Elodie Naessens
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Elsa Ribes
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Franck Panabières
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Agnès Attard
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Nicolas Ris
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Mathilde Clément
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Xavier Barlet
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Yves Marco
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Erwin Grill
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Ruth Eichmann
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Corina Weis
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Ralph Hückelhoven
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Alexandra Ammon
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Jutta Ludwig-Müller
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Lars M Voll
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
| | - Harald Keller
- Institut Sophia Agrobiotech, Unité Mixte de Recherche 1355 Institut National de la Recherche Agronomique-Centre National de la Recherche Scientifique-Université Nice-Sophia Antipolis, 06903 Sophia Antipolis, France (S.H., V.A., E.A., E.N., E.R., F.P., Ag.A., N.R., H.K.);Unité Mixte de Recherche 6191 Commissariat à l'Energie Atomique, Centre National de la Recherche Scientifique, Laboratoire de Biologie du Développement des Plantes, Université d'Aix-Marseille, 13108 Saint-Paul-lez-Durance, France (M.C.);Laboratoire des Interactions Plantes Microorganismes, Unité Mixte de Recherche Centre National de la Recherche Scientifique-Institut National de la Recherche Agronomique 2594/441, 31326 Castanet-Tolosan, France (X.B., Y.M.);Technische Universität München, Lehrstuhl für Botanik (E.G.) and Lehrstuhl für Phytopathologie (R.E., C.W., R.H.), 85350 Freising-Weihenstephan, Germany;Institut für Botanik, Technische Universität Dresden, 01062 Dresden, Germany (J.L.-M.); andFriedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Biochemie, 91058 Erlangen, Germany (Al.A., L.M.V.)
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158
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Rejeb IB, Pastor V, Mauch-Mani B. Plant Responses to Simultaneous Biotic and Abiotic Stress: Molecular Mechanisms. PLANTS (BASEL, SWITZERLAND) 2014; 3:458-75. [PMID: 27135514 PMCID: PMC4844285 DOI: 10.3390/plants3040458] [Citation(s) in RCA: 276] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Revised: 07/29/2014] [Accepted: 10/08/2014] [Indexed: 01/19/2023]
Abstract
Plants are constantly confronted to both abiotic and biotic stresses that seriously reduce their productivity. Plant responses to these stresses are complex and involve numerous physiological, molecular, and cellular adaptations. Recent evidence shows that a combination of abiotic and biotic stress can have a positive effect on plant performance by reducing the susceptibility to biotic stress. Such an interaction between both types of stress points to a crosstalk between their respective signaling pathways. This crosstalk may be synergistic and/or antagonistic and include among others the involvement of phytohormones, transcription factors, kinase cascades, and reactive oxygen species (ROS). In certain cases, such crosstalk can lead to a cross-tolerance and enhancement of a plant's resistance against pathogens. This review aims at giving an insight into cross-tolerance between abiotic and biotic stress, focusing on the molecular level and regulatory pathways.
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Affiliation(s)
- Ines Ben Rejeb
- Faculty of Sciences, Institute of Biology, University of Neuchâtel, Rue Emile Argand 11, 2000 Neuchâtel, Switzerland.
| | - Victoria Pastor
- Faculty of Sciences, Institute of Biology, University of Neuchâtel, Rue Emile Argand 11, 2000 Neuchâtel, Switzerland.
| | - Brigitte Mauch-Mani
- Faculty of Sciences, Institute of Biology, University of Neuchâtel, Rue Emile Argand 11, 2000 Neuchâtel, Switzerland.
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159
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Asai S, Rallapalli G, Piquerez SJM, Caillaud MC, Furzer OJ, Ishaque N, Wirthmueller L, Fabro G, Shirasu K, Jones JDG. Expression profiling during arabidopsis/downy mildew interaction reveals a highly-expressed effector that attenuates responses to salicylic acid. PLoS Pathog 2014; 10:e1004443. [PMID: 25329884 PMCID: PMC4199768 DOI: 10.1371/journal.ppat.1004443] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2014] [Accepted: 09/02/2014] [Indexed: 12/20/2022] Open
Abstract
Plants have evolved strong innate immunity mechanisms, but successful pathogens evade or suppress plant immunity via effectors delivered into the plant cell. Hyaloperonospora arabidopsidis (Hpa) causes downy mildew on Arabidopsis thaliana, and a genome sequence is available for isolate Emoy2. Here, we exploit the availability of genome sequences for Hpa and Arabidopsis to measure gene-expression changes in both Hpa and Arabidopsis simultaneously during infection. Using a high-throughput cDNA tag sequencing method, we reveal expression patterns of Hpa predicted effectors and Arabidopsis genes in compatible and incompatible interactions, and promoter elements associated with Hpa genes expressed during infection. By resequencing Hpa isolate Waco9, we found it evades Arabidopsis resistance gene RPP1 through deletion of the cognate recognized effector ATR1. Arabidopsis salicylic acid (SA)-responsive genes including PR1 were activated not only at early time points in the incompatible interaction but also at late time points in the compatible interaction. By histochemical analysis, we found that Hpa suppresses SA-inducible PR1 expression, specifically in the haustoriated cells into which host-translocated effectors are delivered, but not in non-haustoriated adjacent cells. Finally, we found a highly-expressed Hpa effector candidate that suppresses responsiveness to SA. As this approach can be easily applied to host-pathogen interactions for which both host and pathogen genome sequences are available, this work opens the door towards transcriptome studies in infection biology that should help unravel pathogen infection strategies and the mechanisms by which host defense responses are overcome.
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Affiliation(s)
- Shuta Asai
- The Sainsbury Laboratory, Norwich Research Park, Norwich, United Kingdom
- Center for Sustainable Resource Science, RIKEN, Tsurumi, Yokohama, Kanagawa, Japan
| | | | | | | | - Oliver J. Furzer
- The Sainsbury Laboratory, Norwich Research Park, Norwich, United Kingdom
| | - Naveed Ishaque
- The Sainsbury Laboratory, Norwich Research Park, Norwich, United Kingdom
| | - Lennart Wirthmueller
- The Sainsbury Laboratory, Norwich Research Park, Norwich, United Kingdom
- John Innes Centre, Norwich Research Park, Norwich, United Kingdom
| | - Georgina Fabro
- The Sainsbury Laboratory, Norwich Research Park, Norwich, United Kingdom
| | - Ken Shirasu
- Center for Sustainable Resource Science, RIKEN, Tsurumi, Yokohama, Kanagawa, Japan
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160
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Ji H, Peng Y, Meckes N, Allen S, Stewart CN, Traw MB. ATP-dependent binding cassette transporter G family member 16 increases plant tolerance to abscisic acid and assists in basal resistance against Pseudomonas syringae DC3000. PLANT PHYSIOLOGY 2014; 166:879-88. [PMID: 25146567 PMCID: PMC4213115 DOI: 10.1104/pp.114.248153] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Accepted: 08/21/2014] [Indexed: 05/18/2023]
Abstract
Plants have been shown previously to perceive bacteria on the leaf surface and respond by closing their stomata. The virulent bacterial pathogen Pseudomonas syringae pv tomato DC3000 (PstDC3000) responds by secreting a virulence factor, coronatine, which blocks the functioning of guard cells and forces stomata to reopen. After it is inside the leaf, PstDC3000 has been shown to up-regulate abscisic acid (ABA) signaling and thereby suppress salicylic acid-dependent resistance. Some wild plants exhibit resistance to PstDC3000, but the mechanisms by which they achieve this resistance remain unknown. Here, we used genome-wide association mapping to identify an ATP-dependent binding cassette transporter gene (ATP-dependent binding cassette transporter G family member16) in Arabidopsis (Arabidopsis thaliana) that contributes to wild plant resistance to PstDC3000. Through microarray analysis and β-glucuronidase reporter lines, we showed that the gene is up-regulated by ABA, bacterial infection, and coronatine. We also used a green fluorescent protein fusion protein and found that transporter is more likely to localize on plasma membranes than in cell walls. Transferred DNA insertion lines exhibited consistent defective tolerance of exogenous ABA and reduced resistance to infection by PstDC3000. Our conclusion is that ATP-dependent binding cassette transporter G family member16 is involved in ABA tolerance and contributes to plant resistance against PstDC3000. This is one of the first examples, to our knowledge, of ATP-dependent binding cassette transporter involvement in plant resistance to infection by a bacterial pathogen. It also suggests a possible mechanism by which plants reduce the deleterious effects of ABA hijacking during pathogen attack. Collectively, these results improve our understanding of basal resistance in Arabidopsis and offer unique ABA-related targets for improving the innate resistance of plants to bacterial infection.
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Affiliation(s)
- Hao Ji
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (H.J., N.M., M.B.T.); andDepartment of Plant Sciences, University of Tennessee, Knoxville, Tennessee 37996 (Y.P., S.A., C.N.S.)
| | - Yanhui Peng
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (H.J., N.M., M.B.T.); andDepartment of Plant Sciences, University of Tennessee, Knoxville, Tennessee 37996 (Y.P., S.A., C.N.S.)
| | - Nicole Meckes
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (H.J., N.M., M.B.T.); andDepartment of Plant Sciences, University of Tennessee, Knoxville, Tennessee 37996 (Y.P., S.A., C.N.S.)
| | - Sara Allen
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (H.J., N.M., M.B.T.); andDepartment of Plant Sciences, University of Tennessee, Knoxville, Tennessee 37996 (Y.P., S.A., C.N.S.)
| | - C Neal Stewart
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (H.J., N.M., M.B.T.); andDepartment of Plant Sciences, University of Tennessee, Knoxville, Tennessee 37996 (Y.P., S.A., C.N.S.)
| | - M Brian Traw
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (H.J., N.M., M.B.T.); andDepartment of Plant Sciences, University of Tennessee, Knoxville, Tennessee 37996 (Y.P., S.A., C.N.S.)
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161
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Lim CW, Luan S, Lee SC. A Prominent Role for RCAR3-Mediated ABA Signaling in Response to Pseudomonas syringae pv. tomato DC3000 Infection in Arabidopsis. ACTA ACUST UNITED AC 2014; 55:1691-703. [DOI: 10.1093/pcp/pcu100] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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162
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Bosco R, Daeseleire E, Van Pamel E, Scariot V, Leus L. Development of an ultrahigh-performance liquid chromatography-electrospray ionization-tandem mass spectrometry method for the simultaneous determination of salicylic acid, jasmonic acid, and abscisic acid in rose leaves. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:6278-6284. [PMID: 24932512 DOI: 10.1021/jf5023884] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This paper describes a method to detect and quantitate the endogenous plant hormones (±)-2-cis-4-trans-abscisic acid, (-)-jasmonic acid, and salicylic acid by means of ultrahigh-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) in hybrid rose leaf matrices. Deuterium-labeled [(2)H6] (+)-2-cis-4-trans-abscisic acid, [(2)H6] (±)-jasmonic acid, and [(2)H4]-salicylic acid were used as internal standards. Rose samples (10 mg) were extracted with methanol/water/acetic acid (10:89:1) and subsequently purified on an Oasis MCX 1 cm(3) Vac SPE cartridge. Performance characteristics were validated according to Commission Decision 2002/657/EC. Recovery, repeatability, and within-laboratory reproducibility were acceptable for all phytohormones tested at three different concentrations. The decision limit and detection capability for (±)-2-cis-4-trans-abscisic acid, (-)-jasmonic acid, and salicylic acid were 0.0075 and 0.015 μg/g, 0.00015 and 0.00030 μg/g, and 0.0089 and 0.018 μg/g, respectively. Matrix effects (signal suppression or enhancement) appeared to be high for all substances considered, implying the need for quantitation based on matrix-matched calibration curves.
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Affiliation(s)
- Renato Bosco
- Department of Agricultural, Forest and Food Sciences, University of Torino , Largo Paolo Braccini 2, 10095 Grugliasco, Torino, Italy
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163
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Bostock RM, Pye MF, Roubtsova TV. Predisposition in plant disease: exploiting the nexus in abiotic and biotic stress perception and response. ANNUAL REVIEW OF PHYTOPATHOLOGY 2014; 52:517-49. [PMID: 25001451 DOI: 10.1146/annurev-phyto-081211-172902] [Citation(s) in RCA: 108] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Predisposition results from abiotic stresses occurring prior to infection that affect susceptibility of plants to disease. The environment is seldom optimal for plant growth, and even mild, episodic stresses can predispose plants to inoculum levels they would otherwise resist. Plant responses that are adaptive in the short term may conflict with those for resisting pathogens. Abiotic and biotic stress responses are coordinated by complex signaling networks involving phytohormones and reactive oxygen species (ROS). Abscisic acid (ABA) is a global regulator in stress response networks and an important phytohormone in plant-microbe interactions with systemic effects on resistance and susceptibility. However, extensive cross talk occurs among all the phytohormones during stress events, and the challenge is discerning those interactions that most influence disease. Identifying convergent points in the stress response circuitry is critically important in terms of understanding the fundamental biology that underscores the disease phenotype as well as translating research to improve stress tolerance and disease management in production systems.
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Affiliation(s)
- Richard M Bostock
- Department of Plant Pathology, University of California, Davis, California 95616; , ,
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164
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Kazan K, Lyons R. Intervention of Phytohormone Pathways by Pathogen Effectors. THE PLANT CELL 2014; 26:2285-2309. [PMID: 24920334 PMCID: PMC4114936 DOI: 10.1105/tpc.114.125419] [Citation(s) in RCA: 267] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Revised: 05/16/2014] [Accepted: 05/24/2014] [Indexed: 05/18/2023]
Abstract
The constant struggle between plants and microbes has driven the evolution of multiple defense strategies in the host as well as offense strategies in the pathogen. To defend themselves from pathogen attack, plants often rely on elaborate signaling networks regulated by phytohormones. In turn, pathogens have adopted innovative strategies to manipulate phytohormone-regulated defenses. Tactics frequently employed by plant pathogens involve hijacking, evading, or disrupting hormone signaling pathways and/or crosstalk. As reviewed here, this is achieved mechanistically via pathogen-derived molecules known as effectors, which target phytohormone receptors, transcriptional activators and repressors, and other components of phytohormone signaling in the host plant. Herbivores and sap-sucking insects employ obligate pathogens such as viruses, phytoplasma, or symbiotic bacteria to intervene with phytohormone-regulated defenses. Overall, an improved understanding of phytohormone intervention strategies employed by pests and pathogens during their interactions with plants will ultimately lead to the development of new crop protection strategies.
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Affiliation(s)
- Kemal Kazan
- Commonwealth Scientific and Industrial Research Organization (CSIRO) Plant Industry, Queensland Bioscience Precinct, Brisbane 4069, Queensland, Australia
| | - Rebecca Lyons
- Commonwealth Scientific and Industrial Research Organization (CSIRO) Plant Industry, Queensland Bioscience Precinct, Brisbane 4069, Queensland, Australia
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165
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Engl C, Waite CJ, McKenna JF, Bennett MH, Hamann T, Buck M. Chp8, a diguanylate cyclase from Pseudomonas syringae pv. Tomato DC3000, suppresses the pathogen-associated molecular pattern flagellin, increases extracellular polysaccharides, and promotes plant immune evasion. mBio 2014; 5:e01168-14. [PMID: 24846383 PMCID: PMC4030453 DOI: 10.1128/mbio.01168-14] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Accepted: 04/14/2014] [Indexed: 12/22/2022] Open
Abstract
UNLABELLED The bacterial plant pathogen Pseudomonas syringae causes disease in a wide range of plants. The associated decrease in crop yields results in economic losses and threatens global food security. Competition exists between the plant immune system and the pathogen, the basic principles of which can be applied to animal infection pathways. P. syringae uses a type III secretion system (T3SS) to deliver virulence factors into the plant that promote survival of the bacterium. The P. syringae T3SS is a product of the hypersensitive response and pathogenicity (hrp) and hypersensitive response and conserved (hrc) gene cluster, which is strictly controlled by the codependent enhancer-binding proteins HrpR and HrpS. Through a combination of bacterial gene regulation and phenotypic studies, plant infection assays, and plant hormone quantifications, we now report that Chp8 (i) is embedded in the Hrp regulon and expressed in response to plant signals and HrpRS, (ii) is a functional diguanylate cyclase, (iii) decreases the expression of the major pathogen-associated molecular pattern (PAMP) flagellin and increases extracellular polysaccharides (EPS), and (iv) impacts the salicylic acid/jasmonic acid hormonal immune response and disease progression. We propose that Chp8 expression dampens PAMP-triggered immunity during early plant infection. IMPORTANCE The global demand for food is projected to rise by 50% by 2030 and, as such, represents one of the major challenges of the 21st century, requiring improved crop management. Diseases caused by plant pathogens decrease crop yields, result in significant economic losses, and threaten global food security. Gaining mechanistic insights into the events at the plant-pathogen interface and employing this knowledge to make crops more resilient is one important strategy for improving crop management. Plant-pathogen interactions are characterized by the sophisticated interplay between plant immunity elicited upon pathogen recognition and immune evasion by the pathogen. Here, we identify Chp8 as a contributor to the major effort of the plant pathogen Pseudomonas syringae pv. tomato DC3000 to evade immune responses of the plant.
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Affiliation(s)
- Christoph Engl
- Department of Life Sciences, Imperial College London, London, United Kingdom;
| | - Christopher J Waite
- Department of Life Sciences, Imperial College London, London, United Kingdom
| | - Joseph F McKenna
- Department of Biological and Medical Sciences, Oxford Brookes University, Oxford, United Kingdom
| | - Mark H Bennett
- Department of Life Sciences, Imperial College London, London, United Kingdom
| | - Thorsten Hamann
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Martin Buck
- Department of Life Sciences, Imperial College London, London, United Kingdom;
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166
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Paparella C, Savatin DV, Marti L, De Lorenzo G, Ferrari S. The Arabidopsis LYSIN MOTIF-CONTAINING RECEPTOR-LIKE KINASE3 regulates the cross talk between immunity and abscisic acid responses. PLANT PHYSIOLOGY 2014; 165:262-76. [PMID: 24639336 PMCID: PMC4012585 DOI: 10.1104/pp.113.233759] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Transmembrane receptor-like kinases characterized by the presence of one or more lysin motif (LysM) domains in the extracytoplasmic portion (LysM-containing receptor-like kinases [LYKs]) mediate recognition of symbiotic and pathogenic microorganisms in plants. The Arabidopsis (Arabidopsis thaliana) genome encodes five putative LYKs; among them, AtLYK1/CHITIN ELICITOR RECEPTOR KINASE1 is required for response to chitin and peptidoglycan, and AtLYK4 contributes to chitin perception. More recently, AtLYK3 has been shown to be required for full repression, mediated by Nod factors, of Arabidopsis innate immune responses. In this work, we show that AtLYK3 also negatively regulates basal expression of defense genes and resistance to Botrytis cinerea and Pectobacterium carotovorum infection. Enhanced resistance of atlyk3 mutants requires PHYTOALEXIN-DEFICIENT3, which is crucial for camalexin biosynthesis. The expression of AtLYK3 is strongly repressed by elicitors and fungal infection and is induced by the hormone abscisic acid (ABA), which has a negative impact on resistance against B. cinerea and P. carotovorum. Plants lacking a functional AtLYK3 also show reduced physiological responses to ABA and are partially resistant to ABA-induced inhibition of PHYTOALEXIN-DEFICIENT3 expression. These results indicate that AtLYK3 is important for the cross talk between signaling pathways activated by ABA and pathogens.
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167
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Yin C, Park JJ, Gang DR, Hulbert SH. Characterization of a tryptophan 2-monooxygenase gene from Puccinia graminis f. sp. tritici involved in auxin biosynthesis and rust pathogenicity. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2014; 27:227-35. [PMID: 24350783 DOI: 10.1094/mpmi-09-13-0289-fi] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The plant hormone indole-3-acetic acid (IAA) is best known as a regulator of plant growth and development but its production can also affect plant-microbe interactions. Microorganisms, including numerous plant-associated bacteria and several fungi, are also capable of producing IAA. The stem rust fungus Puccinia graminis f. sp. tritici induced wheat plants to accumulate auxin in infected leaf tissue. A gene (Pgt-IaaM) encoding a putative tryptophan 2-monooxygenase, which makes the auxin precursor indole-3-acetamide (IAM), was identified in the P. graminis f. sp. tritici genome and found to be expressed in haustoria cells in infected plant tissue. Transient silencing of the gene in infected wheat plants indicated that it was required for full pathogenicity. Expression of Pgt-IaaM in Arabidopsis caused a typical auxin expression phenotype and promoted susceptibility to the bacterial pathogen Pseudomonas syringae pv. tomato DC3000.
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168
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León J, Castillo MC, Coego A, Lozano-Juste J, Mir R. Diverse functional interactions between nitric oxide and abscisic acid in plant development and responses to stress. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:907-21. [PMID: 24371253 DOI: 10.1093/jxb/ert454] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The extensive support for abscisic acid (ABA) involvement in the complex regulatory networks controlling stress responses and development in plants contrasts with the relatively recent role assigned to nitric oxide (NO). Because treatment with exogenous ABA leads to enhanced production of NO, it has been widely considered that NO participates downstream of ABA in controlling processes such as stomata movement, seed dormancy, and germination. However, data on leaf senescence and responses to stress suggest that the functional interaction between ABA and NO is more complex than previously thought, including not only cooperation but also antagonism. The functional relationship is probably determined by several factors including the time- and place-dependent pattern of accumulation of both molecules, the threshold levels, and the regulatory factors important for perception. These factors will determine the actions exerted by each regulator. Here, several examples of well-documented functional interactions between NO and ABA are analysed in light of the most recent reported data on seed dormancy and germination, stomata movements, leaf senescence, and responses to abiotic and biotic stresses.
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Affiliation(s)
- José León
- Plant Development and Hormone Action, Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Spain
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169
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Yates SA, Chernukhin I, Alvarez-Fernandez R, Bechtold U, Baeshen M, Baeshen N, Mutwakil MZ, Sabir J, Lawson T, Mullineaux PM. The temporal foliar transcriptome of the perennial C3 desert plant Rhazya stricta in its natural environment. BMC PLANT BIOLOGY 2014; 14:2. [PMID: 24387666 PMCID: PMC3906910 DOI: 10.1186/1471-2229-14-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Accepted: 12/23/2013] [Indexed: 05/23/2023]
Abstract
BACKGROUND The perennial species Rhazya stricta (R. stricta) grows in arid zones and carries out typical C3 photosynthesis under daily extremes of heat, light intensity and low humidity. In order to identify processes attributable to its adaptation to this harsh environment, we profiled the foliar transcriptome of apical and mature leaves harvested from the field at three time periods of the same day. RESULTS Next generation sequencing was used to reconstruct the transcriptome and quantify gene expression. 28018 full length transcript sequences were recovered and 45.4% were differentially expressed (DE) throughout the day. We compared our dataset with microarray experiments in Arabidopsis thaliana (Arabidopsis) and other desert species to identify trends in circadian and stress response profiles between species. 34% of the DE genes were homologous to Arabidopsis circadian-regulated genes. Independent of circadian control, significant overlaps with Arabidopsis genes were observed only with heat and salinity/high light stress-responsive genes. Also, groups of DE genes common to other desert plants species were identified. We identified protein families specific to R. stricta which were found to have diverged from their homologs in other species and which were over -expressed at midday. CONCLUSIONS This study shows that temporal profiling is essential to assess the significance of genes apparently responsive to abiotic stress. This revealed that in R. stricta, the circadian clock is a major regulator of DE genes, even of those annotated as stress-responsive in other species. This may be an important feature of the adaptation of R. stricta to its extreme but predictable environment. However, the majority of DE genes were not circadian-regulated. Of these, some were common to other desert species and others were distinct to R. stricta, suggesting that they are important for the adaptation of such plants to arid environments.
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Affiliation(s)
- Steven A Yates
- School of Biological Sciences, University of Essex, Colchester CO4 3SQ, UK
| | - Igor Chernukhin
- School of Biological Sciences, University of Essex, Colchester CO4 3SQ, UK
| | | | - Ulrike Bechtold
- School of Biological Sciences, University of Essex, Colchester CO4 3SQ, UK
| | - Mohammed Baeshen
- Department of Biological Sciences, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Kingdom of Saudi Arabia
| | - Nabih Baeshen
- Department of Biological Sciences, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Kingdom of Saudi Arabia
| | - Mohammad Z Mutwakil
- Department of Biological Sciences, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Kingdom of Saudi Arabia
| | - Jamal Sabir
- Department of Biological Sciences, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Kingdom of Saudi Arabia
| | - Tracy Lawson
- School of Biological Sciences, University of Essex, Colchester CO4 3SQ, UK
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170
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De Vleesschauwer D, Xu J, Höfte M. Making sense of hormone-mediated defense networking: from rice to Arabidopsis. FRONTIERS IN PLANT SCIENCE 2014; 5:611. [PMID: 25426127 PMCID: PMC4227482 DOI: 10.3389/fpls.2014.00611] [Citation(s) in RCA: 140] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Accepted: 10/20/2014] [Indexed: 05/19/2023]
Abstract
Phytohormones are not only essential for plant growth and development but also play central roles in triggering the plant immune signaling network. Historically, research aimed at elucidating the defense-associated role of hormones has tended to focus on the use of experimentally tractable dicot plants such as Arabidopsis thaliana. Emerging from these studies is a picture whereby complex crosstalk and induced hormonal changes mold plant health and disease, with outcomes largely dependent on the lifestyle and infection strategy of invading pathogens. However, recent studies in monocot plants are starting to provide additional important insights into the immune-regulatory roles of hormones, often revealing unique complexities. In this review, we address the latest discoveries dealing with hormone-mediated immunity in rice, one of the most important food crops and an excellent model for molecular genetic studies in monocots. Moreover, we highlight interactions between hormone signaling, rice defense and pathogen virulence, and discuss the differences and similarities with findings in Arabidopsis. Finally, we present a model for hormone defense networking in rice and describe how detailed knowledge of hormone crosstalk mechanisms can be used for engineering durable rice disease resistance.
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Affiliation(s)
- David De Vleesschauwer
- *Correspondence: David De Vleesschauwer, Laboratory of Phytopathology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, Ghent 9000, Belgium e-mail:
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171
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Defense responses in two ecotypes of Lotus japonicus against non-pathogenic Pseudomonas syringae. PLoS One 2013; 8:e83199. [PMID: 24349460 PMCID: PMC3859661 DOI: 10.1371/journal.pone.0083199] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Accepted: 10/30/2013] [Indexed: 11/20/2022] Open
Abstract
Lotus japonicus is a model legume broadly used to study many important processes as nitrogen fixing nodule formation and adaptation to salt stress. However, no studies on the defense responses occurring in this species against invading microorganisms have been carried out at the present. Understanding how this model plant protects itself against pathogens will certainly help to develop more tolerant cultivars in economically important Lotus species as well as in other legumes. In order to uncover the most important defense mechanisms activated upon bacterial attack, we explored in this work the main responses occurring in the phenotypically contrasting ecotypes MG-20 and Gifu B-129 of L. japonicus after inoculation with Pseudomonas syringae DC3000 pv. tomato. Our analysis demonstrated that this bacterial strain is unable to cause disease in these accessions, even though the defense mechanisms triggered in these ecotypes might differ. Thus, disease tolerance in MG-20 was characterized by bacterial multiplication, chlorosis and desiccation at the infiltrated tissues. In turn, Gifu B-129 plants did not show any symptom at all and were completely successful in restricting bacterial growth. We performed a microarray based analysis of these responses and determined the regulation of several genes that could play important roles in plant defense. Interestingly, we were also able to identify a set of defense genes with a relative high expression in Gifu B-129 plants under non-stress conditions, what could explain its higher tolerance. The participation of these genes in plant defense is discussed. Our results position the L. japonicus-P. syringae interaction as a interesting model to study defense mechanisms in legume species.
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172
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Oide S, Bejai S, Staal J, Guan N, Kaliff M, Dixelius C. A novel role of PR2 in abscisic acid (ABA) mediated, pathogen-induced callose deposition in Arabidopsis thaliana. THE NEW PHYTOLOGIST 2013; 200:1187-99. [PMID: 23952213 DOI: 10.1111/nph.12436] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Accepted: 07/02/2013] [Indexed: 05/20/2023]
Abstract
Pathogenesis-related protein 2 (PR2) is known to play a major role in plant defense and general stress responses. Resistance against the fungal pathogen Leptosphaeria maculans in Arabidopsis requires abscisic acid (ABA), which promotes the deposition of callose, a β-1,3-glucan polymer. Here, we examined the role of PR2 in callose deposition in relation to ABA treatment and challenge with L. maculans and Pseudomonas syringae. Characterization of PR2-overexpressing plants and the knockout line indicated that PR2 negatively affects callose deposition. Recombinant PR2 purified from Pichia pastoris showed callose-degrading activity, and a considerable reduction in the callose-degrading activity was observed in the leaf extract of the PR2 knockout line compared with the wild-type. ABA pretreatment before challenge with L. maculans concomitantly repressed PR2 and enhanced callose accumulation. Likewise, overexpression of an ABA biosynthesis gene NCED3 resulted in reduced PR2 expression and increased callose deposition. We propose that ABA promotes callose deposition through the transcriptional repression of PR2 in Arabidopsis challenged by L. maculans and P. syringae. Callose by itself is likely to act antagonistically on salicylic acid (SA) defense signaling, suggesting that PR2 may function as a modulator of callose- and SA-dependent defense responses.
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Affiliation(s)
- Shinichi Oide
- Department of Plant Biology and Forest Genetics, Uppsala BioCenter, Swedish University of Agricultural Sciences and Linnean Center for Plant Biology, PO Box 7080, 750 07, Uppsala, Sweden
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173
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Chen YJ, Perera V, Christiansen MW, Holme IB, Gregersen PL, Grant MR, Collinge DB, Lyngkjær MF. The barley HvNAC6 transcription factor affects ABA accumulation and promotes basal resistance against powdery mildew. PLANT MOLECULAR BIOLOGY 2013; 83:577-90. [PMID: 23896755 DOI: 10.1007/s11103-013-0109-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Accepted: 07/11/2013] [Indexed: 05/23/2023]
Abstract
Barley HvNAC6 is a member of the plant-specific NAC (NAM, ATAF1,2, CUC2) transcription factor family and we have shown previously that it acts as a positive regulator of basal resistance in barley against the biotrophic pathogen Blumeria graminis f. sp. hordei (Bgh). In this study, we use a transgenic approach to constitutively silence HvNAC6 expression, using RNA interference (RNAi), to investigate the in vivo functions of HvNAC6 in basal resistance responses in barley in relation to the phytohormone ABA. The HvNAC6 RNAi plants displayed reduced HvNAC6 transcript levels and were more susceptible to Bgh than wild-type plants. Application of exogenous ABA increased basal resistance against Bgh in wild-type plants, but not in HvNAC6 RNAi plants, suggesting that ABA is a positive regulator of basal resistance which depends on HvNAC6. Silencing of HvNAC6 expression altered the light/dark rhythm of ABA levels which were, however, not influenced by Bgh inoculation. The expression of the two ABA biosynthetic genes HvNCED1 and HvNCED2 was compromised, and transcript levels of the ABA conjugating HvBG7 enzyme were elevated in the HvNAC6 RNAi lines, but this effect was not clearly associated with transgene-mediated resistance. Together, these data support a function of HvNAC6 as a regulator of ABA-mediated defence responses for maintenance of effective basal resistance against Bgh.
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Affiliation(s)
- Yan-Jun Chen
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg C, Denmark
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174
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Zeier J. New insights into the regulation of plant immunity by amino acid metabolic pathways. PLANT, CELL & ENVIRONMENT 2013; 36:2085-103. [PMID: 23611692 DOI: 10.1111/pce.12122] [Citation(s) in RCA: 213] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Revised: 04/09/2013] [Accepted: 04/14/2013] [Indexed: 05/20/2023]
Abstract
Besides defence pathways regulated by classical stress hormones, distinct amino acid metabolic pathways constitute integral parts of the plant immune system. Mutations in several genes involved in Asp-derived amino acid biosynthetic pathways can have profound impact on plant resistance to specific pathogen types. For instance, amino acid imbalances associated with homoserine or threonine accumulation elevate plant immunity to oomycete pathogens but not to pathogenic fungi or bacteria. The catabolism of Lys produces the immune signal pipecolic acid (Pip), a cyclic, non-protein amino acid. Pip amplifies plant defence responses and acts as a critical regulator of plant systemic acquired resistance, defence priming and local resistance to bacterial pathogens. Asp-derived pyridine nucleotides influence both pre- and post-invasion immunity, and the catabolism of branched chain amino acids appears to affect plant resistance to distinct pathogen classes by modulating crosstalk of salicylic acid- and jasmonic acid-regulated defence pathways. It also emerges that, besides polyamine oxidation and NADPH oxidase, Pro metabolism is involved in the oxidative burst and the hypersensitive response associated with avirulent pathogen recognition. Moreover, the acylation of amino acids can control plant resistance to pathogens and pests by the formation of protective plant metabolites or by the modulation of plant hormone activity.
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Affiliation(s)
- Jürgen Zeier
- Department of Biology, Heinrich Heine University Düsseldorf, 40225, Düsseldorf, Germany
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175
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Groen SC, Whiteman NK, Bahrami AK, Wilczek AM, Cui J, Russell JA, Cibrian-Jaramillo A, Butler IA, Rana JD, Huang GH, Bush J, Ausubel FM, Pierce NE. Pathogen-triggered ethylene signaling mediates systemic-induced susceptibility to herbivory in Arabidopsis. THE PLANT CELL 2013; 25:4755-66. [PMID: 24285796 PMCID: PMC3875748 DOI: 10.1105/tpc.113.113415] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Revised: 10/13/2013] [Accepted: 10/27/2013] [Indexed: 05/18/2023]
Abstract
Multicellular eukaryotic organisms are attacked by numerous parasites from diverse phyla, often simultaneously or sequentially. An outstanding question in these interactions is how hosts integrate signals induced by the attack of different parasites. We used a model system comprised of the plant host Arabidopsis thaliana, the hemibiotrophic bacterial phytopathogen Pseudomonas syringae, and herbivorous larvae of the moth Trichoplusia ni (cabbage looper) to characterize mechanisms involved in systemic-induced susceptibility (SIS) to T. ni herbivory caused by prior infection by virulent P. syringae. We uncovered a complex multilayered induction mechanism for SIS to herbivory. In this mechanism, antiherbivore defenses that depend on signaling via (1) the jasmonic acid-isoleucine conjugate (JA-Ile) and (2) other octadecanoids are suppressed by microbe-associated molecular pattern-triggered salicylic acid (SA) signaling and infection-triggered ethylene signaling, respectively. SIS to herbivory is, in turn, counteracted by a combination of the bacterial JA-Ile mimic coronatine and type III virulence-associated effectors. Our results show that SIS to herbivory involves more than antagonistic signaling between SA and JA-Ile and provide insight into the unexpectedly complex mechanisms behind a seemingly simple trade-off in plant defense against multiple enemies.
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Affiliation(s)
- Simon C. Groen
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
- Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom
| | - Noah K. Whiteman
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
- Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona 85721
| | - Adam K. Bahrami
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
| | - Amity M. Wilczek
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
| | - Jianping Cui
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
- Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115
- Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114
| | - Jacob A. Russell
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
| | | | - Ian A. Butler
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
| | - Jignasha D. Rana
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
| | - Guo-Hua Huang
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
| | - Jenifer Bush
- Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114
| | - Frederick M. Ausubel
- Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115
- Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114
| | - Naomi E. Pierce
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138
- Address correspondence to:
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176
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Mazumder M, Das S, Saha U, Chatterjee M, Bannerjee K, Basu D. Salicylic acid-mediated establishment of the compatibility between Alternaria brassicicola and Brassica juncea is mitigated by abscisic acid in Sinapis alba. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2013; 70:43-51. [PMID: 23770593 DOI: 10.1016/j.plaphy.2013.04.025] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Accepted: 04/30/2013] [Indexed: 05/22/2023]
Abstract
This work addresses the changes in the phytohormonal signature in the recognition of the necrotrophic fungal pathogen Alternaria brassicicola by susceptible Brassica juncea and resistant Sinapis alba. Although B. juncea, S. alba and Arabidopsis all belong to the same family, Brassicaceae, the phytohormonal response of susceptible B. juncea towards this pathogen is unique because the latter two species express non-host resistance. The differential expression of the PR1 gene and the increased level of salicylic acid (SA) indicated that an SA-mediated biotrophic mode of defence response was triggered in B. juncea upon challenge with the pathogen. Compared to B. juncea, resistant S. alba initiated enhanced abscisic acid (ABA) and jasmonic acid (JA) responses following challenge with this pathogen, as revealed by monitoring the expression of ABA-related genes along with the concentration of ABA and JA. Furthermore, these results were verified by the exogenous application of ABA on B. juncea leaves prior to challenge with A. brassicicola, which resulted in a delayed disease progression, followed by the inhibition of the pathogen-mediated increase in SA response and enhanced JA levels. Therefore, it seems that A. brassicicola is steering the defence response towards a biotrophic mode by mounting an SA response in susceptible B. juncea, whereas the enhanced ABA response of S. alba not only counteracts the SA response but also restores the necrotrophic mode of resistance by enhancing JA biosynthesis.
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Affiliation(s)
- Mrinmoy Mazumder
- Division of Plant Biology, Bose Institute, P1/12 C. I. T. Scheme VIIM, Kolkata 700054, West Bengal, India.
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177
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Finiti I, Leyva MO, López-Cruz J, Calderan Rodrigues B, Vicedo B, Angulo C, Bennett AB, Grant M, García-Agustín P, González-Bosch C. Functional analysis of endo-1,4-β-glucanases in response to Botrytis cinerea and Pseudomonas syringae reveals their involvement in plant-pathogen interactions. PLANT BIOLOGY (STUTTGART, GERMANY) 2013; 15:819-31. [PMID: 23528138 DOI: 10.1111/j.1438-8677.2012.00701.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Accepted: 10/10/2012] [Indexed: 05/21/2023]
Abstract
Plant cell wall modification is a critical component in stress responses. Endo-1,4-β-glucanases (EGs) take part in cell wall editing processes, e.g. elongation, ripening and abscission. Here we studied the infection response of Solanum lycopersicum and Arabidopsis thaliana with impaired EGs. Transgenic TomCel1 and TomCel2 tomato antisense plants challenged with Pseudomonas syringae showed higher susceptibility, callose priming and increased jasmonic acid pathway marker gene expression. These two EGs could be resistance factors and may act as negative regulators of callose deposition, probably by interfering with the defence-signalling network. A study of a set of Arabidopsis EG T-DNA insertion mutants challenged with P. syringae and Botrytis cinerea revealed that the lack of other EGs interferes with infection phenotype, callose deposition, expression of signalling pathway marker genes and hormonal balance. We conclude that a lack of EGs could alter plant response to pathogens by modifying the properties of the cell wall and/or interfering with signalling pathways, contributing to generate the appropriate signalling outcomes. Analysis of microarray data demonstrates that EGs are differentially expressed upon many different plant-pathogen challenges, hormone treatments and many abiotic stresses. We found some Arabidopsis EG mutants with increased tolerance to osmotic and salt stress. Our results show that impairing EGs can alter plant-pathogen interactions and may contribute to appropriate signalling outcomes in many different biotic and abiotic plant stress responses.
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Affiliation(s)
- I Finiti
- Departamento de Bioquímica y Biología Molecular, Universidad de Valencia, IATA (CSIC), Valencia, Spain
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178
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Kim JG, Stork W, Mudgett MB. Xanthomonas type III effector XopD desumoylates tomato transcription factor SlERF4 to suppress ethylene responses and promote pathogen growth. Cell Host Microbe 2013; 13:143-54. [PMID: 23414755 DOI: 10.1016/j.chom.2013.01.006] [Citation(s) in RCA: 126] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Revised: 10/27/2012] [Accepted: 01/16/2013] [Indexed: 01/01/2023]
Abstract
XopD, a type III secretion effector from Xanthomonas euvesicatoria (Xcv), the causal agent of bacterial spot of tomato, is required for pathogen growth and delay of host symptom development. XopD carries a C-terminal SUMO protease domain, a host range determining nonspecific DNA-binding domain and two EAR motifs typically found in repressors of stress-induced transcription. The precise target(s) and mechanism(s) of XopD are obscure. We report that XopD directly targets the tomato ethylene responsive transcription factor SlERF4 to suppress ethylene production, which is required for anti-Xcv immunity and symptom development. SlERF4 expression was required for Xcv ΔxopD-induced ethylene production and ethylene-stimulated immunity. XopD colocalized with SlERF4 in subnuclear foci and catalyzed SUMO1 hydrolysis from lysine 53 of SlERF4, causing SlERF4 destabilization. Mutation of lysine 53 prevented SlERF4 sumoylation, decreased SlERF4 levels, and reduced SlERF4 transcription. These data suggest that XopD desumoylates SlERF4 to repress ethylene-induced transcription required for anti-Xcv immunity.
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Affiliation(s)
- Jung-Gun Kim
- Department of Biology, Stanford University, Stanford, CA 94305-5020, USA
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179
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Jensen MK, Lindemose S, Masi FD, Reimer JJ, Nielsen M, Perera V, Workman CT, Turck F, Grant MR, Mundy J, Petersen M, Skriver K. ATAF1 transcription factor directly regulates abscisic acid biosynthetic gene NCED3 in Arabidopsis thaliana. FEBS Open Bio 2013; 3:321-7. [PMID: 23951554 PMCID: PMC3741915 DOI: 10.1016/j.fob.2013.07.006] [Citation(s) in RCA: 132] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2013] [Accepted: 07/23/2013] [Indexed: 12/20/2022] Open
Abstract
ATAF1, an Arabidopsis thaliana NAC transcription factor, plays important roles in plant adaptation to environmental stress and development. To search for ATAF1 target genes, we used protein binding microarrays and chromatin-immunoprecipitation (ChIP). This identified T[A,C,G]CGT[A,G] and TT[A,C,G]CGT as ATAF1 consensus binding sequences. Co-expression analysis across publicly available microarray experiments identified 25 genes co-expressed with ATAF1. The promoter regions of ATAF1 co-expressors were significantly enriched for ATAF1 binding sites, and TTGCGTA was identified in the promoter of the key abscisic acid (ABA) phytohormone biosynthetic gene NCED3. ChIP-qPCR and expression analysis showed that ATAF1 binding to the NCED3 promoter correlated with increased NCED3 expression and ABA hormone levels. These results indicate that ATAF1 regulates ABA biosynthesis.
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Key Words
- ABA, abscisic acid
- ATAF1, Arabidopsis thaliana activating factor 1
- Abscisic acid biosynthesis
- Arabidopsis
- ChIP, chromatin-immunoprecipitation
- DBD, DNA-binding domain
- DNA-binding
- NAC transcription factor
- NAC, NAM, ATAF1/2, CUC2
- NCED3, 9-cis-epoxycarotenoid dioxygenase-3
- PBM, protein-binding microarrays
- PWM, position weight matrix
- SnRK, Sucrose nonfermenting 1(SNF1)-related serine/threonine-protein kinase
- TF, transcription factor
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Affiliation(s)
- Michael Krogh Jensen
- Department of Biology, University of Copenhagen, Ole Maaloes Vej 5, DK-2200 Copenhagen N, Denmark
| | - Søren Lindemose
- Department of Biology, University of Copenhagen, Ole Maaloes Vej 5, DK-2200 Copenhagen N, Denmark
| | - Federico de Masi
- Center for Biological Sequence Analysis, Department of Systems Biology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
| | - Julia J. Reimer
- Department of Plant Developmental Biology, Max Planck Institute for Plant Breeding Research, Cologne, Germany
| | - Michael Nielsen
- Department of Biology, University of Copenhagen, Ole Maaloes Vej 5, DK-2200 Copenhagen N, Denmark
| | - Venura Perera
- School of Biosciences, University of Exeter, Exeter EX4 4QD, United Kingdom
| | - Chris T. Workman
- Center for Biological Sequence Analysis, Department of Systems Biology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
| | - Franziska Turck
- Department of Plant Developmental Biology, Max Planck Institute for Plant Breeding Research, Cologne, Germany
| | - Murray R. Grant
- School of Biosciences, University of Exeter, Exeter EX4 4QD, United Kingdom
| | - John Mundy
- Department of Biology, University of Copenhagen, Ole Maaloes Vej 5, DK-2200 Copenhagen N, Denmark
| | - Morten Petersen
- Department of Biology, University of Copenhagen, Ole Maaloes Vej 5, DK-2200 Copenhagen N, Denmark
| | - Karen Skriver
- Department of Biology, University of Copenhagen, Ole Maaloes Vej 5, DK-2200 Copenhagen N, Denmark
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180
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Xu J, Audenaert K, Hofte M, De Vleesschauwer D. Abscisic Acid Promotes Susceptibility to the Rice Leaf Blight Pathogen Xanthomonas oryzae pv oryzae by Suppressing Salicylic Acid-Mediated Defenses. PLoS One 2013; 8:e67413. [PMID: 23826294 PMCID: PMC3694875 DOI: 10.1371/journal.pone.0067413] [Citation(s) in RCA: 107] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2013] [Accepted: 05/17/2013] [Indexed: 11/26/2022] Open
Abstract
The plant hormone abscisic acid (ABA) is involved in a wide variety of plant processes, including the initiation of stress-adaptive responses to various environmental cues. Recently, ABA also emerged as a central factor in the regulation and integration of plant immune responses, although little is known about the underlying mechanisms. Aiming to advance our understanding of ABA-modulated disease resistance, we have analyzed the impact, dynamics and interrelationship of ABA and the classic defense hormone salicylic acid (SA) during progression of rice infection by the leaf blight pathogen Xanthomonas oryzae pv. oryzae (Xoo). Consistent with ABA negatively regulating resistance to Xoo, we found that exogenously administered ABA renders rice hypersusceptible to infection, whereas chemical and genetic disruption of ABA biosynthesis and signaling, respectively, led to enhanced Xoo resistance. In addition, we found successful Xoo infection to be associated with extensive reprogramming of ABA biosynthesis and response genes, suggesting that ABA functions as a virulence factor for Xoo. Interestingly, several lines of evidence indicate that this immune-suppressive effect of ABA is due at least in part to suppression of SA-mediated defenses that normally serve to limit pathogen growth. Resistance induced by the ABA biosynthesis inhibitor fluridone, however, appears to operate in a SA-independent manner and is likely due to induction of non-specific physiological stress. Collectively, our findings favor a scenario whereby virulent Xoo hijacks the rice ABA machinery to cause disease and highlight the importance of ABA and its crosstalk with SA in shaping the outcome of rice-Xoo interactions.
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Affiliation(s)
- Jing Xu
- Laboratory of Phytopathology, Ghent University, Ghent, Belgium
| | - Kris Audenaert
- Laboratory of Phytopathology, Ghent University, Ghent, Belgium
- Faculty of Applied Bioscience Engineering, Ghent University College, Ghent, Belgium
| | - Monica Hofte
- Laboratory of Phytopathology, Ghent University, Ghent, Belgium
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181
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Sawinski K, Mersmann S, Robatzek S, Böhmer M. Guarding the green: pathways to stomatal immunity. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2013; 26:626-32. [PMID: 23441577 DOI: 10.1094/mpmi-12-12-0288-cr] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Guard cells regulate plant gas exchange and transpiration by modulation of stomatal aperture upon integrating external cues like photosynthetic effective illumination, CO2 levels and water availability and internal signals like abscisic acid (ABA). Being pores, stomata constitute a natural entry site for potentially harmful microbes. To prevent microbial invasion, stomata close upon perception of microbe-associated molecular patterns (MAMPs), and this represents an important layer of active immunity at the preinvasive level. The signaling pathways leading to stomatal closure triggered by biotic and abiotic stresses employ several common components, such as reactive oxygen species, calcium, kinases, and hormones, suggesting considerable intersection between MAMP- and ABA-induced stomatal closures, which we will discuss in this review.
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182
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Cui F, Wu S, Sun W, Coaker G, Kunkel B, He P, Shan L. The Pseudomonas syringae type III effector AvrRpt2 promotes pathogen virulence via stimulating Arabidopsis auxin/indole acetic acid protein turnover. PLANT PHYSIOLOGY 2013; 162:1018-29. [PMID: 23632856 PMCID: PMC3668037 DOI: 10.1104/pp.113.219659] [Citation(s) in RCA: 90] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Accepted: 04/29/2013] [Indexed: 05/19/2023]
Abstract
To accomplish successful infection, pathogens deploy complex strategies to interfere with host defense systems and subvert host physiology to favor pathogen survival and multiplication. Modulation of plant auxin physiology and signaling is emerging as a common virulence strategy for phytobacteria to cause diseases. However, the underlying mechanisms remain largely elusive. We have previously shown that the Pseudomonas syringae type III effector AvrRpt2 alters Arabidopsis (Arabidopsis thaliana) auxin physiology. Here, we report that AvrRpt2 promotes auxin response by stimulating the turnover of auxin/indole acetic acid (Aux/IAA) proteins, the key negative regulators in auxin signaling. AvrRpt2 acts additively with auxin to stimulate Aux/IAA turnover, suggesting distinct, yet proteasome-dependent, mechanisms operated by AvrRpt2 and auxin to control Aux/IAA stability. Cysteine protease activity is required for AvrRpt2-stimulated auxin signaling and Aux/IAA degradation. Importantly, transgenic plants expressing the dominant axr2-1 mutation recalcitrant to AvrRpt2-mediated degradation ameliorated the virulence functions of AvrRpt2 but did not alter the avirulent function mediated by the corresponding RPS2 resistance protein. Thus, promoting auxin response via modulating the stability of the key transcription repressors Aux/IAA is a mechanism used by the bacterial type III effector AvrRpt2 to promote pathogenicity.
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183
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Denancé N, Sánchez-Vallet A, Goffner D, Molina A. Disease resistance or growth: the role of plant hormones in balancing immune responses and fitness costs. FRONTIERS IN PLANT SCIENCE 2013; 4:155. [PMID: 23745126 PMCID: PMC3662895 DOI: 10.3389/fpls.2013.00155] [Citation(s) in RCA: 328] [Impact Index Per Article: 29.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Accepted: 05/05/2013] [Indexed: 05/18/2023]
Abstract
Plant growth and response to environmental cues are largely governed by phytohormones. The plant hormones ethylene, jasmonic acid, and salicylic acid (SA) play a central role in the regulation of plant immune responses. In addition, other plant hormones, such as auxins, abscisic acid (ABA), cytokinins, gibberellins, and brassinosteroids, that have been thoroughly described to regulate plant development and growth, have recently emerged as key regulators of plant immunity. Plant hormones interact in complex networks to balance the response to developmental and environmental cues and thus limiting defense-associated fitness costs. The molecular mechanisms that govern these hormonal networks are largely unknown. Moreover, hormone signaling pathways are targeted by pathogens to disturb and evade plant defense responses. In this review, we address novel insights on the regulatory roles of the ABA, SA, and auxin in plant resistance to pathogens and we describe the complex interactions among their signal transduction pathways. The strategies developed by pathogens to evade hormone-mediated defensive responses are also described. Based on these data we discuss how hormone signaling could be manipulated to improve the resistance of crops to pathogens.
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Affiliation(s)
- Nicolas Denancé
- UMR 5546, Laboratoire de Recherche en Sciences Végétales, Université de ToulouseCastanet-Tolosan, France
- UMR 5546, Laboratoire de Recherche en Sciences Végétales, Centre National de la Recherche ScientifiqueCastanet-Tolosan, France
| | - Andrea Sánchez-Vallet
- Laboratory of Phytopathology, Wageningen UniversityWageningen, Netherlands
- Centro de Biotecnología y Genómica de Plantas, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Universidad Politécnica de MadridPozuelo de Alarcón, Spain
- Departamento de Biotecnología, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de MadridMadrid, Spain
| | - Deborah Goffner
- UMR 5546, Laboratoire de Recherche en Sciences Végétales, Université de ToulouseCastanet-Tolosan, France
- UMR 5546, Laboratoire de Recherche en Sciences Végétales, Centre National de la Recherche ScientifiqueCastanet-Tolosan, France
| | - Antonio Molina
- Centro de Biotecnología y Genómica de Plantas, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Universidad Politécnica de MadridPozuelo de Alarcón, Spain
- Departamento de Biotecnología, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de MadridMadrid, Spain
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184
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Pye MF, Hakuno F, MacDonald JD, Bostock RM. Induced resistance in tomato by SAR activators during predisposing salinity stress. FRONTIERS IN PLANT SCIENCE 2013; 4:116. [PMID: 23653630 PMCID: PMC3644939 DOI: 10.3389/fpls.2013.00116] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Accepted: 04/12/2013] [Indexed: 05/03/2023]
Abstract
Plant activators are chemicals that induce disease resistance. The phytohormone salicylic acid (SA) is a crucial signal for systemic acquired resistance (SAR), and SA-mediated resistance is a target of several commercial plant activators, including Actigard (1,2,3-benzothiadiazole-7-thiocarboxylic acid-S-methyl-ester, BTH) and Tiadinil [N-(3-chloro-4-methylphenyl)-4-methyl-1,2,3-thiadiazole-5-carboxamide, TDL]. BTH and TDL were examined for their impact on abscisic acid (ABA)-mediated, salt-induced disease predisposition in tomato seedlings. A brief episode of salt stress to roots significantly increased the severity of disease caused by Pseudomonas syringae pv. tomato (Pst) and Phytophthora capsici relative to non-stressed plants. Root treatment with TDL induced resistance to Pst in leaves and provided protection in both non-stressed and salt-stressed seedlings in wild-type and highly susceptible NahG plants. Non-stressed and salt-stressed ABA-deficient sitiens mutants were highly resistant to Pst. Neither TDL nor BTH induced resistance to root infection by Phytophthora capsici, nor did they moderate the salt-induced increment in disease severity. Root treatment with these plant activators increased the levels of ABA in roots and shoots similar to levels observed in salt-stressed plants. The results indicate that SAR activators can protect tomato plants from bacterial speck disease under predisposing salt stress, and suggest that some SA-mediated defense responses function sufficiently in plants with elevated levels of ABA.
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Affiliation(s)
- Matthew F. Pye
- Department of Plant Pathology, University of California at Davis, DavisCA, USA
| | - Fumiaki Hakuno
- Research Center, Nihon Nohyaku Co., Ltd.Kawachi-Nagano,Osaka, Japan
| | - James D. MacDonald
- Department of Plant Pathology, University of California at Davis, DavisCA, USA
| | - Richard M. Bostock
- Department of Plant Pathology, University of California at Davis, DavisCA, USA
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185
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Gimenez-Ibanez S, Solano R. Nuclear jasmonate and salicylate signaling and crosstalk in defense against pathogens. FRONTIERS IN PLANT SCIENCE 2013; 4:72. [PMID: 23577014 PMCID: PMC3617366 DOI: 10.3389/fpls.2013.00072] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Accepted: 03/15/2013] [Indexed: 05/20/2023]
Abstract
An extraordinary progress has been made over the last two decades on understanding the components and mechanisms governing plant innate immunity. After detection of a pathogen, effective plant resistance depends on the activation of a complex signaling network integrated by small signaling molecules and hormonal pathways, and the balance of these hormone systems determines resistance to particular pathogens. The discovery of new components of hormonal signaling pathways, including plant nuclear hormone receptors, is providing a picture of complex crosstalk and induced hormonal changes that modulate disease and resistance through several protein families that perceive hormones within the nucleus and lead to massive gene induction responses often achieved by de-repression. This review highlights recent advances in our understanding of positive and negative regulators of these hormones signaling pathways that are crucial regulatory targets of hormonal crosstalk in disease and defense. We focus on the most recent discoveries on the jasmonate and salicylate pathway components that explain their crosstalk with other hormonal pathways in the nucleus. We discuss how these components fine-tune defense responses to build a robust plant immune system against a great number of different microbes and, finally, we summarize recent discoveries on specific nuclear hormonal manipulation by microbes which exemplify the ingenious ways by which pathogens can take control over the plant's hormone signaling network to promote disease.
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Affiliation(s)
| | - Roberto Solano
- Plant Molecular Genetics Department, Centro Nacional de Biotecnología-Consejo Superior de Investigaciones CientíficasMadrid, Spain
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186
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Ho YP, Tan CM, Li MY, Lin H, Deng WL, Yang JY. The AvrB_AvrC domain of AvrXccC of Xanthomonas campestris pv. campestris is required to elicit plant defense responses and manipulate ABA homeostasis. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2013; 26:419-30. [PMID: 23252460 DOI: 10.1094/mpmi-06-12-0164-r] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Plant disease induced by Xanthomonas campestris pv. campestris depends on type III effectors but the molecular basis is poorly understood. Here, AvrXccC8004 was characterized, and it was found that the AvrB_AvrC domain was essential and sufficient to elicit defense responses in an Arabidopsis-resistant ecotype (Col-0). An upregulation of genes in responding to the AvrB_AvrC domain of AvrXccC8004 was shown in a profile of host gene expression. The molecular changes were correlated with morphological changes observed in phenotypic and ultrastructural characterizations. Interestingly, the abscisic acid (ABA)-signaling pathway was also a prominent target for the AvrB_AvrC domain of AvrXccC8004. The highly elicited NCED5, encoding a key enzyme of ABA biosynthesis, was increased in parallel with ABA levels in AvrXccC8004 transgenic plants. Consistently, the X. campestris pv. campestris 8004 ΔavrXccC mutant was severely impaired in the ability to manipulate the accumulation of ABA and induction of ABA-related genes in challenged leaves. Moreover, exogenous application of ABA also enhanced the susceptibility of Arabidopsis to the X. campestris pv. campestris strains. These results indicate that the AvrB_AvrC domain of AvrXccC8004 alone has the activity to manipulate ABA homeostasis, which plays an important role in regulating the interactions of X. campestris pv. campestris and Arabidopsis.
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Affiliation(s)
- Yi-Ping Ho
- Institute of Biochemistry, National ChungHsing University, Taichung, Taiwan
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187
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Chien CF, Mathieu J, Hsu CH, Boyle P, Martin GB, Lin NC. Nonhost resistance of tomato to the bean pathogen Pseudomonas syringae pv. syringae B728a is due to a defective E3 ubiquitin ligase domain in avrptobb728a. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2013; 26:387-97. [PMID: 23252461 PMCID: PMC3882120 DOI: 10.1094/mpmi-08-12-0190-r] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The bean pathogen Pseudomonas syringae pv. syringae B728a expresses homologs of the type III effectors AvrPto and AvrPtoB, either of which can trigger resistance in tomato cultivars expressing Pto and Prf genes. We found that strain B728a also elicits nonhost resistance in tomato cultivars VFNT Cherry and Moneymaker that lack Pto but express other members of the Pto family (e.g., SlFen and SlPtoC). Here, we show that the AvrPtoB homolog from B728a, termed AvrPtoBB728a (also known as HopAB1), is recognized by 'VFNT Cherry' and 'Moneymaker' when the effector is expressed in P. syringae pv. syringae 61, a strain lacking the avrPto or avrPtoB homolog. Using a gene-silencing approach, this recognition was shown to involve one or more Pto family members and Prf. AvrPtoBB728a interacted with SlFen, SlPtoC, and SlPtoD, in addition to Pto, in a yeast two-hybrid assay. In P. syringae pv. tomato DC3000, the C-terminal domain of AvrPtoB is an E3 ubiquitin ligase that ubiquitinates Fen, causing its degradation and leading to disease susceptibility. Although the C-terminal domain of AvrPtoBB728a shares 69% amino acid identity with that of AvrPtoB, we found that it has greatly reduced E3 ligase activity and is unable to ubiquitinate Fen in an in vitro ubiquitination assay. Thus, the nonhost resistance of 'VFNT Cherry' and 'Moneymaker' to B728a appears to be due to recognition of AvrPtoBB728 as a result of the effector's reduced E3 ligase activity, which prevents it from facilitating degradation of a Pto family member. We speculate that the primary plant host of B728a lacks a Fen-like protein and that, therefore, the E3 ligase of AvrPtoBB728 was unnecessary for pathogenicity and has diverged and become ineffective.
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Affiliation(s)
- Ching-Fang Chien
- Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan
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188
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Dou D, Zhou JM. Phytopathogen effectors subverting host immunity: different foes, similar battleground. Cell Host Microbe 2013; 12:484-95. [PMID: 23084917 DOI: 10.1016/j.chom.2012.09.003] [Citation(s) in RCA: 296] [Impact Index Per Article: 26.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Phytopathogenic bacteria, fungi, and oomycetes invade and colonize their host plants through distinct routes. These pathogens secrete diverse groups of effector proteins that aid infection and establishment of different parasitic lifestyles. Despite this diversity, a comparison of different plant-pathogen systems has revealed remarkable similarities in the host immune pathways targeted by effectors from distinct pathogen groups. Immune signaling pathways mediated by pattern recognition receptors, phytohormone homeostasis or signaling, defenses associated with host secretory pathways and pathogen penetrations, and plant cell death represent some of the key processes controlling disease resistance against diverse pathogens. These immune pathways are targeted by effectors that carry a wide range of biochemical functions and are secreted by completely different pathogen groups, suggesting that these pathways are a common battleground encountered by many plant pathogens.
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Affiliation(s)
- Daolong Dou
- College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China
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189
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Sharma R, De Vleesschauwer D, Sharma MK, Ronald PC. Recent advances in dissecting stress-regulatory crosstalk in rice. MOLECULAR PLANT 2013; 6:250-60. [PMID: 23292878 DOI: 10.1093/mp/sss147] [Citation(s) in RCA: 102] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Biotic and abiotic stresses impose a serious limitation on crop productivity worldwide. Prior or simultaneous exposure to one type of stress often affects the plant response to other stresses, indicating extensive overlap and crosstalk between stress-response signaling pathways. Systems biology approaches that integrate large genomic and proteomic data sets have facilitated identification of candidate genes that govern this stress-regulatory crosstalk. Recently, we constructed a yeast two-hybrid map around three rice proteins that control the response to biotic and abiotic stresses, namely the immune receptor XA21, which confers resistance to the Gram-negative bacterium, Xanthomonas oryzae pv. oryzae; NH1, the rice ortholog of NPR1, a key regulator of systemic acquired resistance; and the ethylene-responsive transcription factor, SUB1A, which confers tolerance to submergence stress. These studies coupled with transcriptional profiling and co-expression analyses identified a suite of proteins that are positioned at the interface of biotic and abiotic stress responses, including mitogen-activated protein kinase 5 (OsMPK5), wall-associated kinase 25 (WAK25), sucrose non-fermenting-1-related protein kinase-1 (SnRK1), SUB1A binding protein 23 (SAB23), and several WRKY family transcription factors. Emerging evidence suggests that these genes orchestrate crosstalk between biotic and abiotic stresses through a variety of mechanisms, including regulation of cellular energy homeostasis and modification of synergistic and/or antagonistic interactions between the stress hormones salicylic acid, ethylene, jasmonic acid, and abscisic acid.
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Affiliation(s)
- Rita Sharma
- Department of Plant Pathology and Genome Center, University of California, Davis, CA 95616, USA
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190
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Venkatakrishnan S, Mackey D, Meier I. Functional investigation of the plant-specific long coiled-coil proteins PAMP-INDUCED COILED-COIL (PICC) and PICC-LIKE (PICL) in Arabidopsis thaliana. PLoS One 2013; 8:e57283. [PMID: 23451199 PMCID: PMC3581476 DOI: 10.1371/journal.pone.0057283] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Accepted: 01/23/2013] [Indexed: 12/20/2022] Open
Abstract
We have identified and characterized two Arabidopsis long coiled-coil proteins PAMP-INDUCED COILED-COIL (PICC) and PICC-LIKE (PICL). PICC (147 kDa) and PICL (87 kDa) are paralogs that consist predominantly of a long coiled-coil domain (expanded in PICC), with a predicted transmembrane domain at the immediate C-terminus. Orthologs of PICC and PICL were found exclusively in vascular plants. PICC and PICL GFP fusion proteins are anchored to the cytoplasmic surface of the endoplasmic reticulum (ER) membrane by a C-terminal transmembrane domain and a short tail domain, via a tail-anchoring mechanism. T-DNA-insertion mutants of PICC and PICL as well as the double mutant show an increased sensitivity to the plant abiotic stress hormone abscisic acid (ABA) in a post-germination growth response. PICC, but not PICL gene expression is induced by the bacterial pathogen-associated molecular pattern (PAMP) flg22. T-DNA insertion alleles of PICC, but not PICL, show increased susceptibility to the non-virulent strain P. syringae pv. tomato DC3000 hrcC, but not to the virulent strain P. syringae pv. tomato DC3000. This suggests that PICC mutants are compromised in PAMP-triggered immunity (PTI). The data presented here provide first evidence for the involvement of a plant long coiled-coil protein in a plant defense response.
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Affiliation(s)
- Sowmya Venkatakrishnan
- Department of Molecular Genetics, The Ohio State University, Columbus, Ohio, United States of America
| | - David Mackey
- Department of Molecular Genetics, The Ohio State University, Columbus, Ohio, United States of America
- Department of Horticulture and Crop Science, The Ohio State University, Columbus, Ohio, United States of America
| | - Iris Meier
- Department of Molecular Genetics, The Ohio State University, Columbus, Ohio, United States of America
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191
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Wang Y, Dang F, Liu Z, Wang X, Eulgem T, Lai Y, Yu L, She J, Shi Y, Lin J, Chen C, Guan D, Qiu A, He S. CaWRKY58, encoding a group I WRKY transcription factor of Capsicum annuum, negatively regulates resistance to Ralstonia solanacearum infection. MOLECULAR PLANT PATHOLOGY 2013; 14:131-44. [PMID: 23057972 PMCID: PMC6638745 DOI: 10.1111/j.1364-3703.2012.00836.x] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
WRKY transcription factors are encoded by large gene families across the plant kingdom. So far, their biological and molecular functions in nonmodel plants, including pepper (Capsicum annuum) and other Solanaceae, remain poorly understood. Here, we report on the functional characterization of a new group I WRKY protein from pepper, termed CaWRKY58. Our data indicate that CaWRKY58 can be localized to the nucleus and can activate the transcription of the reporter β-glucuronidase (GUS) gene driven by the 35S core promoter with two copies of the W-box in its proximal upstream region. In pepper plants infected with the bacterial pathogen Ralstonia solanacearum, CaWRKY58 transcript levels showed a biphasic response, manifested in an early/transient down-regulation and late up-regulation. CaWRKY58 transcripts were suppressed by treatment with methyl jasmonate and abscisic acid. Tobacco plants overexpressing CaWRKY58 did not show any obvious morphological phenotypes, but exhibited disease symptoms of greater severity than did wild-type plants. The enhanced susceptibility of CaWRKY58-overexpressing tobacco plants correlated with the decreased expression of hypersensitive response marker genes, as well as various defence-associated genes. Consistently, CaWRKY58 pepper plants silenced by virus-induced gene silencing (VIGS) displayed enhanced resistance to the highly virulent R. solanacearum strain FJC100301, and this was correlated with enhanced transcripts of defence-related pepper genes. Our results suggest that CaWRKY58 acts as a transcriptional activator of negative regulators in the resistance of pepper to R. solanacearum infection.
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Affiliation(s)
- Yuna Wang
- College of Life Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
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Grant MR, Kazan K, Manners JM. Exploiting pathogens' tricks of the trade for engineering of plant disease resistance: challenges and opportunities. Microb Biotechnol 2013; 6:212-22. [PMID: 23279915 PMCID: PMC3815916 DOI: 10.1111/1751-7915.12017] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2012] [Accepted: 11/17/2012] [Indexed: 12/01/2022] Open
Abstract
With expansion of our understanding of pathogen effector strategies and the multiplicity of their host targets, it is becoming evident that novel approaches to engineering broad-spectrum resistance need to be deployed. The increasing availability of high temporal gene expression data of a range of plant–microbe interactions enables the judicious choices of promoters to fine-tune timing and magnitude of expression under specified stress conditions. We can therefore contemplate engineering a range of transgenic lines designed to interfere with pathogen virulence strategies that target plant hormone signalling or deploy specific disease resistance genes. An advantage of such an approach is that hormonal signalling is generic so if this strategy is effective, it can be easily implemented in a range of crop species. Additionally, multiple re-wired lines can be crossed to develop more effective responses to pathogens.
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Affiliation(s)
- Murray R Grant
- College of Life and Environmental Sciences, University of Exeter, Exeter, Stocker Road, Exeter, EX4 4QD, UK.
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193
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Blanco-Ulate B, Vincenti E, Powell ALT, Cantu D. Tomato transcriptome and mutant analyses suggest a role for plant stress hormones in the interaction between fruit and Botrytis cinerea. FRONTIERS IN PLANT SCIENCE 2013; 4:142. [PMID: 23717322 PMCID: PMC3653111 DOI: 10.3389/fpls.2013.00142] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Accepted: 04/25/2013] [Indexed: 05/19/2023]
Abstract
Fruit-pathogen interactions are a valuable biological system to study the role of plant development in the transition from resistance to susceptibility. In general, unripe fruit are resistant to pathogen infection but become increasingly more susceptible as they ripen. During ripening, fruit undergo significant physiological and biochemical changes that are coordinated by complex regulatory and hormonal signaling networks. The interplay between multiple plant stress hormones in the interaction between plant vegetative tissues and microbial pathogens has been documented extensively, but the relevance of these hormones during infections of fruit is unclear. In this work, we analyzed a transcriptome study of tomato fruit infected with Botrytis cinerea in order to profile the expression of genes for the biosynthesis, modification and signal transduction of ethylene (ET), salicylic acid (SA), jasmonic acid (JA), and abscisic acid (ABA), hormones that may be not only involved in ripening, but also in fruit interactions with pathogens. The changes in relative expression of key genes during infection and assays of susceptibility of fruit with impaired synthesis or perception of these hormones were used to formulate hypotheses regarding the involvement of these regulators in the outcome of the tomato fruit-B. cinerea interaction.
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Affiliation(s)
- Barbara Blanco-Ulate
- Department of Plant Sciences, University of California, DavisDavis, CA, USA
- Department of Viticulture and Enology, University of California, DavisDavis, CA, USA
| | - Estefania Vincenti
- Department of Plant Sciences, University of California, DavisDavis, CA, USA
| | - Ann L. T. Powell
- Department of Plant Sciences, University of California, DavisDavis, CA, USA
| | - Dario Cantu
- Department of Viticulture and Enology, University of California, DavisDavis, CA, USA
- *Correspondence: Dario Cantu, Department of Viticulture and Enology, University of California, Davis, One Shields Ave., Davis, CA 95616, USA. e-mail:
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194
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Abstract
Abscisic acid (ABA) is one of the "classical" plant hormones, i.e. discovered at least 50 years ago, that regulates many aspects of plant growth and development. This chapter reviews our current understanding of ABA synthesis, metabolism, transport, and signal transduction, emphasizing knowledge gained from studies of Arabidopsis. A combination of genetic, molecular and biochemical studies has identified nearly all of the enzymes involved in ABA metabolism, almost 200 loci regulating ABA response, and thousands of genes regulated by ABA in various contexts. Some of these regulators are implicated in cross-talk with other developmental, environmental or hormonal signals. Specific details of the ABA signaling mechanisms vary among tissues or developmental stages; these are discussed in the context of ABA effects on seed maturation, germination, seedling growth, vegetative stress responses, stomatal regulation, pathogen response, flowering, and senescence.
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Affiliation(s)
- Ruth Finkelstein
- Department of Molecular, Cellular and Developmental Biology, University of California at Santa Barbara, Santa Barbara, CA 93106 Address
- correspondence to e-mail:
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195
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Gruner K, Griebel T, Návarová H, Attaran E, Zeier J. Reprogramming of plants during systemic acquired resistance. FRONTIERS IN PLANT SCIENCE 2013; 4:252. [PMID: 23874348 PMCID: PMC3711057 DOI: 10.3389/fpls.2013.00252] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Accepted: 06/21/2013] [Indexed: 05/18/2023]
Abstract
Genome-wide microarray analyses revealed that during biological activation of systemic acquired resistance (SAR) in Arabidopsis, the transcript levels of several hundred plant genes were consistently up- (SAR(+) genes) or down-regulated (SAR(-) genes) in systemic, non-inoculated leaf tissue. This transcriptional reprogramming fully depended on the SAR regulator FLAVIN-DEPENDENT MONOOXYGENASE1 (FMO1). Functional gene categorization showed that genes associated with salicylic acid (SA)-associated defenses, signal transduction, transport, and the secretory machinery are overrepresented in the group of SAR(+) genes, and that the group of SAR(-) genes is enriched in genes activated via the jasmonate (JA)/ethylene (ET)-defense pathway, as well as in genes associated with cell wall remodeling and biosynthesis of constitutively produced secondary metabolites. This suggests that SAR-induced plants reallocate part of their physiological activity from vegetative growth towards SA-related defense activation. Alignment of the SAR expression data with other microarray information allowed us to define three clusters of SAR(+) genes. Cluster I consists of genes tightly regulated by SA. Cluster II genes can be expressed independently of SA, and this group is moderately enriched in H2O2- and abscisic acid (ABA)-responsive genes. The expression of the cluster III SAR(+) genes is partly SA-dependent. We propose that SA-independent signaling events in early stages of SAR activation enable the biosynthesis of SA and thus initiate SA-dependent SAR signaling. Both SA-independent and SA-dependent events tightly co-operate to realize SAR. SAR(+) genes function in the establishment of diverse resistance layers, in the direct execution of resistance against different (hemi-)biotrophic pathogen types, in suppression of the JA- and ABA-signaling pathways, in redox homeostasis, and in the containment of defense response activation. Our data further indicated that SAR-associated defense priming can be realized by partial pre-activation of particular defense pathways.
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Affiliation(s)
- Katrin Gruner
- Department of Biology, Heinrich Heine UniversityDüsseldorf, Germany
| | - Thomas Griebel
- Department of Plant-Microbe Interactions, Max Planck Institute for Plant Breeding ResearchCologne, Germany
| | - Hana Návarová
- Department of Biology, Heinrich Heine UniversityDüsseldorf, Germany
| | - Elham Attaran
- Department of Plant Biology, Michigan State UniversityEast Lansing, MI, USA
| | - Jürgen Zeier
- Department of Biology, Heinrich Heine UniversityDüsseldorf, Germany
- *Correspondence: Jürgen Zeier, Department of Biology, Heinrich Heine University, Universitätsstraße 1, 40225 Düsseldorf, Germany e-mail:
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196
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Denancé N, Sánchez-Vallet A, Goffner D, Molina A. Disease resistance or growth: the role of plant hormones in balancing immune responses and fitness costs. FRONTIERS IN PLANT SCIENCE 2013. [PMID: 23745126 DOI: 10.3389/fpls.2013.00155/abstract] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Plant growth and response to environmental cues are largely governed by phytohormones. The plant hormones ethylene, jasmonic acid, and salicylic acid (SA) play a central role in the regulation of plant immune responses. In addition, other plant hormones, such as auxins, abscisic acid (ABA), cytokinins, gibberellins, and brassinosteroids, that have been thoroughly described to regulate plant development and growth, have recently emerged as key regulators of plant immunity. Plant hormones interact in complex networks to balance the response to developmental and environmental cues and thus limiting defense-associated fitness costs. The molecular mechanisms that govern these hormonal networks are largely unknown. Moreover, hormone signaling pathways are targeted by pathogens to disturb and evade plant defense responses. In this review, we address novel insights on the regulatory roles of the ABA, SA, and auxin in plant resistance to pathogens and we describe the complex interactions among their signal transduction pathways. The strategies developed by pathogens to evade hormone-mediated defensive responses are also described. Based on these data we discuss how hormone signaling could be manipulated to improve the resistance of crops to pathogens.
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Affiliation(s)
- Nicolas Denancé
- UMR 5546, Laboratoire de Recherche en Sciences Végétales, Université de Toulouse Castanet-Tolosan, France ; UMR 5546, Laboratoire de Recherche en Sciences Végétales, Centre National de la Recherche Scientifique Castanet-Tolosan, France
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197
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Sánchez-Vallet A, López G, Ramos B, Delgado-Cerezo M, Riviere MP, Llorente F, Fernández PV, Miedes E, Estevez JM, Grant M, Molina A. Disruption of abscisic acid signaling constitutively activates Arabidopsis resistance to the necrotrophic fungus Plectosphaerella cucumerina. PLANT PHYSIOLOGY 2012; 160:2109-24. [PMID: 23037505 PMCID: PMC3510135 DOI: 10.1104/pp.112.200154] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2012] [Accepted: 10/01/2012] [Indexed: 05/20/2023]
Abstract
Plant resistance to necrotrophic fungi is regulated by a complex set of signaling pathways that includes those mediated by the hormones salicylic acid (SA), ethylene (ET), jasmonic acid (JA), and abscisic acid (ABA). The role of ABA in plant resistance remains controversial, as positive and negative regulatory functions have been described depending on the plant-pathogen interaction analyzed. Here, we show that ABA signaling negatively regulates Arabidopsis (Arabidopsis thaliana) resistance to the necrotrophic fungus Plectosphaerella cucumerina. Arabidopsis plants impaired in ABA biosynthesis, such as the aba1-6 mutant, or in ABA signaling, like the quadruple pyr/pyl mutant (pyr1pyl1pyl2pyl4), were more resistant to P. cucumerina than wild-type plants. In contrast, the hab1-1abi1-2abi2-2 mutant impaired in three phosphatases that negatively regulate ABA signaling displayed an enhanced susceptibility phenotype to this fungus. Comparative transcriptomic analyses of aba1-6 and wild-type plants revealed that the ABA pathway negatively regulates defense genes, many of which are controlled by the SA, JA, or ET pathway. In line with these data, we found that aba1-6 resistance to P. cucumerina was partially compromised when the SA, JA, or ET pathway was disrupted in this mutant. Additionally, in the aba1-6 plants, some genes encoding cell wall-related proteins were misregulated. Fourier transform infrared spectroscopy and biochemical analyses of cell walls from aba1-6 and wild-type plants revealed significant differences in their Fourier transform infrared spectratypes and uronic acid and cellulose contents. All these data suggest that ABA signaling has a complex function in Arabidopsis basal resistance, negatively regulating SA/JA/ET-mediated resistance to necrotrophic fungi.
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198
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Rawat N, Neeraja CN, Nair S, Bentur JS. Differential gene expression in gall midge susceptible rice genotypes revealed by suppressive subtraction hybridization (SSH) cDNA libraries and microarray analysis. RICE (NEW YORK, N.Y.) 2012; 5:8. [PMID: 27234234 PMCID: PMC5520839 DOI: 10.1186/1939-8433-5-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Accepted: 04/03/2012] [Indexed: 05/09/2023]
Abstract
BACKGROUND A major pest of rice, the Asian rice gall midge (Orseolia oryzae Wood-Mason), causes significant yield losses in the rice growing regions throughout Asia. Feeding by the larvae induces susceptible plants to produce nutritive tissue to support growth and development. In order to identify molecular signatures during compatible interactions, genome wide transcriptional profiling was performed using SSH library and microarray technology. RESULTS Results revealed up-regulation of genes related to primary metabolism, nutrient relocation, cell organization and DNA synthesis. Concomitantly, defense, secondary metabolism and signaling genes were suppressed. Further, real-time PCR validation of a selected set of 20 genes, in three susceptible rice varieties (TN1, Kavya and Suraksha) during the interaction with the respective virulent gall midge biotypes, also revealed variation in gene expression in Kavya as compared to TN1 and Suraksha. CONCLUSIONS These studies showed that virulent insects induced the plants to step up metabolism and transport nutrients to their feeding site and suppressed defense responses. But Kavya rice mounted an elevated defense response during early hours of virulent gall midge infestation, which was over-powered later, resulting in host plant susceptibility.
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Affiliation(s)
- Nidhi Rawat
- Directorate of Rice Research, Rajendranagar, Hyderabad, 500 030 AP India
| | | | - Suresh Nair
- International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi, 110067 India
| | - Jagadish S Bentur
- Directorate of Rice Research, Rajendranagar, Hyderabad, 500 030 AP India
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199
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Petti C, Reiber K, Ali SS, Berney M, Doohan FM. Auxin as a player in the biocontrol of Fusarium head blight disease of barley and its potential as a disease control agent. BMC PLANT BIOLOGY 2012; 12:224. [PMID: 23173736 PMCID: PMC3556313 DOI: 10.1186/1471-2229-12-224] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Accepted: 10/29/2012] [Indexed: 05/18/2023]
Abstract
BACKGROUND Mechanisms involved in the biological control of plant diseases are varied and complex. Hormones, including the auxin indole acetic acid (IAA) and abscisic acid (ABA), are essential regulators of a multitude of biological functions, including plant responses to biotic and abiotic stressors. This study set out to determine what hormones might play a role in Pseudomonas fluorescens -mediated control of Fusarium head blight (FHB) disease of barley and to determine if biocontrol-associated hormones directly affect disease development. RESULTS A previous study distinguished bacterium-responsive genes from bacterium-primed genes, distinguished by the fact that the latter are only up-regulated when both P. fluorescens and the pathogen Fusarium culmorum are present. In silico analysis of the promoter sequences available for a subset of the bacterium-primed genes identified several hormones, including IAA and ABA as potential regulators of transcription. Treatment with the bacterium or pathogen resulted in increased IAA and ABA levels in head tissue; both microbes had additive effects on the accumulation of IAA but not of ABA. The microbe-induced accumulation of ABA preceded that of IAA. Gene expression analysis showed that both hormones up-regulated the accumulation of bacterium-primed genes. But IAA, more than ABA up-regulated the transcription of the ABA biosynthesis gene NCED or the signalling gene Pi2, both of which were previously shown to be bacterium-responsive rather than primed. Application of IAA, but not of ABA reduced both disease severity and yield loss caused by F. culmorum, but neither hormone affect in vitro fungal growth. CONCLUSIONS Both IAA and ABA are involved in the P. fluorescens-mediated control of FHB disease of barley. Gene expression studies also support the hypothesis that IAA plays a role in the primed response to F. culmorum. This hypothesis was validated by the fact that pre-application of IAA reduced both symptoms and yield loss asssociated with the disease. This is the first evidence that IAA plays a role in the control of FHB disease and in the bacterial priming of host defences.
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Affiliation(s)
- Carloalberto Petti
- Molecular Plant-Pathogen Interaction Group, School of Biology and Environmental Science, University College Dublin, Science Education and Research Centre West, Belfield, Dublin, Ireland
- Current address: Department of Horticulture, Science Centre North, University of Kentucky, Lexington, Kentucky, 40502, USA
| | - Kathrin Reiber
- Molecular Plant-Pathogen Interaction Group, School of Biology and Environmental Science, University College Dublin, Science Education and Research Centre West, Belfield, Dublin, Ireland
| | - Shahin S Ali
- Molecular Plant-Pathogen Interaction Group, School of Biology and Environmental Science, University College Dublin, Science Education and Research Centre West, Belfield, Dublin, Ireland
| | - Margaret Berney
- Molecular Plant-Pathogen Interaction Group, School of Biology and Environmental Science, University College Dublin, Science Education and Research Centre West, Belfield, Dublin, Ireland
| | - Fiona M Doohan
- UCD School of Biology and Environmental Sciences, Room 148, Science Education and Research Centre West, UCD, Belfield, Dublin 4, Ireland
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200
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Pieterse CM, Van der Does D, Zamioudis C, Leon-Reyes A, Van Wees SC. Hormonal Modulation of Plant Immunity. Annu Rev Cell Dev Biol 2012; 28:489-521. [DOI: 10.1146/annurev-cellbio-092910-154055] [Citation(s) in RCA: 1753] [Impact Index Per Article: 146.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Corné M.J. Pieterse
- Plant-Microbe Interactions, Institute of Environmental Biology, Department of Biology, Faculty of Science, Utrecht University, 3508 TB Utrecht, The Netherlands; , , ,
- Centre for BioSystems Genomics, 6700 AB Wageningen, The Netherlands
| | - Dieuwertje Van der Does
- Plant-Microbe Interactions, Institute of Environmental Biology, Department of Biology, Faculty of Science, Utrecht University, 3508 TB Utrecht, The Netherlands; , , ,
| | - Christos Zamioudis
- Plant-Microbe Interactions, Institute of Environmental Biology, Department of Biology, Faculty of Science, Utrecht University, 3508 TB Utrecht, The Netherlands; , , ,
| | - Antonio Leon-Reyes
- Laboratorio de Biotecnología Agrícola y de Alimentos, Universidad San Francisco de Quito, Quito, Ecuador;
| | - Saskia C.M. Van Wees
- Plant-Microbe Interactions, Institute of Environmental Biology, Department of Biology, Faculty of Science, Utrecht University, 3508 TB Utrecht, The Netherlands; , , ,
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