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Sheikh AH, Zacharia I, Pardal AJ, Dominguez-Ferreras A, Sueldo DJ, Kim JG, Balmuth A, Gutierrez JR, Conlan BF, Ullah N, Nippe OM, Girija AM, Wu CH, Sessa G, Jones AME, Grant MR, Gifford ML, Mudgett MB, Rathjen JP, Ntoukakis V. Dynamic changes of the Prf/Pto tomato resistance complex following effector recognition. Nat Commun 2023; 14:2568. [PMID: 37142566 PMCID: PMC10160066 DOI: 10.1038/s41467-023-38103-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Accepted: 04/16/2023] [Indexed: 05/06/2023] Open
Abstract
In both plants and animals, nucleotide-binding leucine-rich repeat (NLR) immune receptors play critical roles in pathogen recognition and activation of innate immunity. In plants, NLRs recognise pathogen-derived effector proteins and initiate effector-triggered immunity (ETI). However, the molecular mechanisms that link NLR-mediated effector recognition and downstream signalling are not fully understood. By exploiting the well-characterised tomato Prf/Pto NLR resistance complex, we identified the 14-3-3 proteins TFT1 and TFT3 as interacting partners of both the NLR complex and the protein kinase MAPKKKα. Moreover, we identified the helper NRC proteins (NLR-required for cell death) as integral components of the Prf /Pto NLR recognition complex. Notably our studies revealed that TFTs and NRCs interact with distinct modules of the NLR complex and, following effector recognition, dissociate facilitating downstream signalling. Thus, our data provide a mechanistic link between activation of immune receptors and initiation of downstream signalling cascades.
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Affiliation(s)
- Arsheed H Sheikh
- School of Life Sciences, University of Warwick, Coventry, CV4 7AL, UK
- Center for Desert Agriculture, BESE Division, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Iosif Zacharia
- School of Life Sciences, University of Warwick, Coventry, CV4 7AL, UK
| | - Alonso J Pardal
- School of Life Sciences, University of Warwick, Coventry, CV4 7AL, UK
| | | | - Daniela J Sueldo
- School of Life Sciences, University of Warwick, Coventry, CV4 7AL, UK
- Department of Biology, Faculty of Natural Sciences, Norwegian University of Science and Technology, Hogskoleringen 1, 7491, Trondheim, Norway
| | - Jung-Gun Kim
- Department of Biology, Stanford University, Stanford, CA, 94305, USA
| | - Alexi Balmuth
- J.R. Simplot Company, Boise, ID, USA
- The Sainsbury Laboratory, Norwich Research Park, Norwich, NR4 7UH, UK
| | - Jose R Gutierrez
- The Sainsbury Laboratory, Norwich Research Park, Norwich, NR4 7UH, UK
| | - Brendon F Conlan
- Research School of Biology, The Australian National University, Acton, 2601, ACT, Australia
| | - Najeeb Ullah
- School of Life Sciences, University of Warwick, Coventry, CV4 7AL, UK
| | - Olivia M Nippe
- School of Life Sciences, University of Warwick, Coventry, CV4 7AL, UK
| | - Anil M Girija
- School of Plant Sciences and Food Security, Tel-Aviv University, 69978, Tel-Aviv, Israel
| | - Chih-Hang Wu
- The Sainsbury Laboratory, Norwich Research Park, Norwich, NR4 7UH, UK
| | - Guido Sessa
- School of Plant Sciences and Food Security, Tel-Aviv University, 69978, Tel-Aviv, Israel
| | | | - Murray R Grant
- School of Life Sciences, University of Warwick, Coventry, CV4 7AL, UK
| | - Miriam L Gifford
- School of Life Sciences, University of Warwick, Coventry, CV4 7AL, UK
- Warwick Integrative Synthetic Biology Centre, University of Warwick, Coventry, CV4 7AL, UK
| | - Mary Beth Mudgett
- Department of Biology, Stanford University, Stanford, CA, 94305, USA
| | - John P Rathjen
- Research School of Biology, The Australian National University, Acton, 2601, ACT, Australia
| | - Vardis Ntoukakis
- School of Life Sciences, University of Warwick, Coventry, CV4 7AL, UK.
- Warwick Integrative Synthetic Biology Centre, University of Warwick, Coventry, CV4 7AL, UK.
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2
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Achom M, Roy P, Lagunas B, Picot E, Richards L, Bonyadi-Pour R, Pardal AJ, Baxter L, Richmond BL, Aschauer N, Fletcher EM, Rowson M, Blackwell J, Rich-Griffin C, Mysore KS, Wen J, Ott S, Carré IA, Gifford ML. Plant circadian clock control of Medicago truncatula nodulation via regulation of nodule cysteine-rich peptides. J Exp Bot 2022; 73:2142-2156. [PMID: 34850882 PMCID: PMC8982390 DOI: 10.1093/jxb/erab526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 11/30/2021] [Indexed: 06/13/2023]
Abstract
Legumes house nitrogen-fixing endosymbiotic rhizobia in specialized polyploid cells within root nodules, which undergo tightly regulated metabolic activity. By carrying out expression analysis of transcripts over time in Medicago truncatula nodules, we found that the circadian clock enables coordinated control of metabolic and regulatory processes linked to nitrogen fixation. This involves the circadian clock-associated transcription factor LATE ELONGATED HYPOCOTYL (LHY), with lhy mutants being affected in nodulation. Rhythmic transcripts in root nodules include a subset of nodule-specific cysteine-rich peptides (NCRs) that have the LHY-bound conserved evening element in their promoters. Until now, studies have suggested that NCRs act to regulate bacteroid differentiation and keep the rhizobial population in check. However, these conclusions came from the study of a few members of this very large gene family that has complex diversified spatio-temporal expression. We suggest that rhythmic expression of NCRs may be important for temporal coordination of bacterial activity with the rhythms of the plant host, in order to ensure optimal symbiosis.
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Affiliation(s)
- Mingkee Achom
- School of Life Sciences, Gibbet Hill Road, University of Warwick, Coventry CV4 7AL, UK
| | - Proyash Roy
- School of Life Sciences, Gibbet Hill Road, University of Warwick, Coventry CV4 7AL, UK
- Department of Genetic Engineering & Biotechnology, University of Dhaka, Dhaka, Bangladesh
| | - Beatriz Lagunas
- School of Life Sciences, Gibbet Hill Road, University of Warwick, Coventry CV4 7AL, UK
| | - Emma Picot
- School of Life Sciences, Gibbet Hill Road, University of Warwick, Coventry CV4 7AL, UK
| | - Luke Richards
- School of Life Sciences, Gibbet Hill Road, University of Warwick, Coventry CV4 7AL, UK
| | - Roxanna Bonyadi-Pour
- School of Life Sciences, Gibbet Hill Road, University of Warwick, Coventry CV4 7AL, UK
| | - Alonso J Pardal
- Warwick Medical School, University of Warwick, Coventry CV4 7AL, UK
| | - Laura Baxter
- School of Life Sciences, Gibbet Hill Road, University of Warwick, Coventry CV4 7AL, UK
| | - Bethany L Richmond
- School of Life Sciences, Gibbet Hill Road, University of Warwick, Coventry CV4 7AL, UK
| | - Nadine Aschauer
- School of Life Sciences, Gibbet Hill Road, University of Warwick, Coventry CV4 7AL, UK
| | - Eleanor M Fletcher
- School of Life Sciences, Gibbet Hill Road, University of Warwick, Coventry CV4 7AL, UK
- School of Biological Sciences, University of Bristol, 24 Tyndall Avenue, Bristol BS8 1TQ, UK
| | - Monique Rowson
- School of Life Sciences, Gibbet Hill Road, University of Warwick, Coventry CV4 7AL, UK
| | - Joseph Blackwell
- School of Life Sciences, Gibbet Hill Road, University of Warwick, Coventry CV4 7AL, UK
| | - Charlotte Rich-Griffin
- School of Life Sciences, Gibbet Hill Road, University of Warwick, Coventry CV4 7AL, UK
- Wellcome Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, UK
| | - Kirankumar S Mysore
- Institute for Agricultural Biosciences, Oklahoma State University, Ardmore, OK 73401, USA
| | - Jiangqi Wen
- Institute for Agricultural Biosciences, Oklahoma State University, Ardmore, OK 73401, USA
| | - Sascha Ott
- Warwick Medical School, University of Warwick, Coventry CV4 7AL, UK
| | - Isabelle A Carré
- School of Life Sciences, Gibbet Hill Road, University of Warwick, Coventry CV4 7AL, UK
| | - Miriam L Gifford
- School of Life Sciences, Gibbet Hill Road, University of Warwick, Coventry CV4 7AL, UK
- Warwick Integrative Synthetic Biology Centre, University of Warwick, Coventry CV4 7AL, UK
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3
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Gkizi D, González Gil A, Pardal AJ, Piquerez SJM, Sergaki C, Ntoukakis V, Tjamos SE. The bacterial biocontrol agent Paenibacillus alvei K165 confers inherited resistance to Verticillium dahliae. J Exp Bot 2021; 72:4565-4576. [PMID: 33829257 PMCID: PMC8163062 DOI: 10.1093/jxb/erab154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Accepted: 04/06/2021] [Indexed: 06/12/2023]
Abstract
The biocontrol agent Paenibacillus alvei K165 was previously shown to protect Arabidopsis thaliana plants against Verticillium dahliae. Here we show that K165 also confers inherited immune resistance to V. dahliae. By performing a histone acetyltransferases mutant screen, ChIP assays, and transcriptomic experiments, we were able to show that histone acetylation significantly contributes to the K165 biocontrol activity and establishment of inheritable resistance to V. dahliae. K165 treatment primed the expression of immune-related marker genes and the cinnamyl alcohol dehydrogenase gene CAD3 through the function of histone acetyltransferases. Our results reveal that offspring of plants treated with K165 have primed immunity and enhanced lignification, both contributing towards the K165-mediated inherited immune resistance. Thus, our study paves the way for the use of biocontrol agents for the establishment of inheritable resistance to agronomically important pathogens.
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Affiliation(s)
- Danai Gkizi
- Laboratory of Plant Pathology, Agricultural University of Athens, Athens, Greece
| | | | - Alonso J Pardal
- School of Life Sciences, University of Warwick, Coventry, UK
| | | | - Chrysi Sergaki
- School of Life Sciences, University of Warwick, Coventry, UK
| | - Vardis Ntoukakis
- School of Life Sciences, University of Warwick, Coventry, UK
- Warwick Integrative Synthetic Biology Centre, University of Warwick, Coventry, UK
| | - Sotirios E Tjamos
- Laboratory of Plant Pathology, Agricultural University of Athens, Athens, Greece
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Pardal AJ, Piquerez SJM, Dominguez-Ferreras A, Frungillo L, Mastorakis E, Reilly E, Latrasse D, Concia L, Gimenez-Ibanez S, Spoel SH, Benhamed M, Ntoukakis V. Immunity onset alters plant chromatin and utilizes EDA16 to regulate oxidative homeostasis. PLoS Pathog 2021; 17:e1009572. [PMID: 34015058 PMCID: PMC8171942 DOI: 10.1371/journal.ppat.1009572] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 06/02/2021] [Accepted: 04/19/2021] [Indexed: 01/23/2023] Open
Abstract
Perception of microbes by plants leads to dynamic reprogramming of the transcriptome, which is essential for plant health. The appropriate amplitude of this transcriptional response can be regulated at multiple levels, including chromatin. However, the mechanisms underlying the interplay between chromatin remodeling and transcription dynamics upon activation of plant immunity remain poorly understood. Here, we present evidence that activation of plant immunity by bacteria leads to nucleosome repositioning, which correlates with altered transcription. Nucleosome remodeling follows distinct patterns of nucleosome repositioning at different loci. Using a reverse genetic screen, we identify multiple chromatin remodeling ATPases with previously undescribed roles in immunity, including EMBRYO SAC DEVELOPMENT ARREST 16, EDA16. Functional characterization of the immune-inducible chromatin remodeling ATPase EDA16 revealed a mechanism to negatively regulate immunity activation and limit changes in redox homeostasis. Our transcriptomic data combined with MNase-seq data for EDA16 functional knock-out and over-expressor mutants show that EDA16 selectively regulates a defined subset of genes involved in redox signaling through nucleosome repositioning. Thus, collectively, chromatin remodeling ATPases fine-tune immune responses and provide a previously uncharacterized mechanism of immune regulation.
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Affiliation(s)
- Alonso J. Pardal
- School of Life Sciences, University of Warwick, Coventry, United Kingdom
| | - Sophie J. M. Piquerez
- School of Life Sciences, University of Warwick, Coventry, United Kingdom
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, INRAE, Université de Paris, Orsay, France
| | | | - Lucas Frungillo
- Institute of Molecular Plant Sciences, School of Biological Sciences, University of Edinburgh, Edinburgh, United Kingdom
| | | | - Emma Reilly
- School of Life Sciences, University of Warwick, Coventry, United Kingdom
| | - David Latrasse
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, INRAE, Université de Paris, Orsay, France
| | - Lorenzo Concia
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, INRAE, Université de Paris, Orsay, France
| | - Selena Gimenez-Ibanez
- Plant Molecular Genetics Department, Centro Nacional de Biotecnología-CSIC (CNB-CSIC), Madrid, Spain
| | - Steven H. Spoel
- Institute of Molecular Plant Sciences, School of Biological Sciences, University of Edinburgh, Edinburgh, United Kingdom
| | - Moussa Benhamed
- Institute of Plant Sciences Paris-Saclay (IPS2), CNRS, INRAE, Université de Paris, Orsay, France
| | - Vardis Ntoukakis
- School of Life Sciences, University of Warwick, Coventry, United Kingdom
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5
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Lagunas B, Achom M, Bonyadi-Pour R, Pardal AJ, Richmond BL, Sergaki C, Vázquez S, Schäfer P, Ott S, Hammond J, Gifford ML. Regulation of Resource Partitioning Coordinates Nitrogen and Rhizobia Responses and Autoregulation of Nodulation in Medicago truncatula. Mol Plant 2019; 12:833-846. [PMID: 30953787 PMCID: PMC6557310 DOI: 10.1016/j.molp.2019.03.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 03/14/2019] [Accepted: 03/18/2019] [Indexed: 05/29/2023]
Abstract
Understanding how plants respond to nitrogen in their environment is crucial for determining how they use it and how the nitrogen use affects other processes related to plant growth and development. Under nitrogen limitation the activity and affinity of uptake systems is increased in roots, and lateral root formation is regulated in order to adapt to low nitrogen levels and scavenge from the soil. Plants in the legume family can form associations with rhizobial nitrogen-fixing bacteria, and this association is tightly regulated by nitrogen levels. The effect of nitrogen on nodulation has been extensively investigated, but the effects of nodulation on plant nitrogen responses remain largely unclear. In this study, we integrated molecular and phenotypic data in the legume Medicago truncatula and determined that genes controlling nitrogen influx are differently expressed depending on whether plants are mock or rhizobia inoculated. We found that a functional autoregulation of nodulation pathway is required for roots to perceive, take up, and mobilize nitrogen as well as for normal root development. Our results together revealed that autoregulation of nodulation, root development, and the location of nitrogen are processes balanced by the whole plant system as part of a resource-partitioning mechanism.
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Affiliation(s)
- Beatriz Lagunas
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK
| | - Mingkee Achom
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK
| | | | - Alonso J Pardal
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK
| | | | - Chrysi Sergaki
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK
| | - Saúl Vázquez
- Gateway Building, Sutton Bonington Campus, University of Nottingham, Sutton Bonington LE12 5RD, UK
| | - Patrick Schäfer
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK
| | - Sascha Ott
- Department of Computer Science, University of Warwick, Coventry CV4 7AL, UK
| | - John Hammond
- School of Agriculture, Policy and Development, University of Reading, Reading RG6 6AH, UK; Southern Cross Plant Science, Southern Cross University, Lismore, NSW 2480, Australia
| | - Miriam L Gifford
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK.
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6
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Quareshy M, Prusinska J, Kieffer M, Fukui K, Pardal AJ, Lehmann S, Schafer P, del Genio CI, Kepinski S, Hayashi K, Marsh A, Napier RM. The Tetrazole Analogue of the Auxin Indole-3-acetic Acid Binds Preferentially to TIR1 and Not AFB5. ACS Chem Biol 2018; 13:2585-2594. [PMID: 30138566 DOI: 10.1021/acschembio.8b00527] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Indole-3-acetic acid (auxin) is considered one of the cardinal hormones in plant growth and development. It regulates a wide range of processes throughout the plant. Synthetic auxins exploit the auxin-signaling pathway and are valuable as herbicidal agrochemicals. Currently, despite a diversity of chemical scaffolds all synthetic auxins have a carboxylic acid as the active core group. By applying bio-isosteric replacement we discovered that indole-3-tetrazole was active by surface plasmon resonance spectrometry, showing that the tetrazole could initiate assembly of the Transport Inhibitor Resistant 1 (TIR1) auxin coreceptor complex. We then tested the tetrazole's efficacy in a range of whole plant physiological assays and in protoplast reporter assays, which all confirmed auxin activity, albeit rather weak. We then tested indole-3-tetrazole against the AFB5 homologue of TIR1, finding that binding was selective against TIR1, absent with AFB5. The kinetics of binding to TIR1 are contrasted to those for the herbicide picloram, which shows the opposite receptor preference, as it binds to AFB5 with far greater affinity than to TIR1. The basis of the preference of indole-3-tetrazole for TIR1 was revealed to be a single residue substitution using molecular docking, and assays using tir1 and afb5 mutant lines confirmed selectivity in vivo. Given the potential that a TIR1-selective auxin might have for unmasking receptor-specific actions, we followed a rational design, lead optimization campaign, and a set of chlorinated indole-3-tetrazoles was synthesized. Improved affinity for TIR1 and the preference for binding to TIR1 was maintained for 4- and 6-chloroindole-3-tetrazoles, coupled with improved efficacy in vivo. This work expands the range of auxin chemistry for the design of receptor-selective synthetic auxins.
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Affiliation(s)
| | | | - Martin Kieffer
- Centre for Plant Sciences, University of Leeds, Leeds LS2 9JT, U.K
| | - Kosuke Fukui
- Department of Biochemistry, Okayama University of Science, 1-1 Ridaicho, Kita-ku, Okayama-shi Okayama 700-0005, Japan
| | | | - Silke Lehmann
- Warwick Integrative Synthetic Biology Centre, Coventry CV4 7AL, U.K
| | - Patrick Schafer
- Warwick Integrative Synthetic Biology Centre, Coventry CV4 7AL, U.K
| | | | - Stefan Kepinski
- Centre for Plant Sciences, University of Leeds, Leeds LS2 9JT, U.K
| | - Kenichiro Hayashi
- Department of Biochemistry, Okayama University of Science, 1-1 Ridaicho, Kita-ku, Okayama-shi Okayama 700-0005, Japan
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Rubio MB, Pardal AJ, Cardoza RE, Gutiérrez S, Monte E, Hermosa R. Involvement of the Transcriptional Coactivator ThMBF1 in the Biocontrol Activity of Trichoderma harzianum. Front Microbiol 2017; 8:2273. [PMID: 29201024 PMCID: PMC5696597 DOI: 10.3389/fmicb.2017.02273] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Accepted: 11/06/2017] [Indexed: 01/20/2023] Open
Abstract
Trichoderma harzianum is a filamentous fungus well adapted to different ecological niches. Owing to its ability to antagonize a wide range of plant pathogens, it is used as a biological control agent in agriculture. Selected strains of T. harzianum are also able to increase the tolerance of plants to biotic and abiotic stresses. However, little is known about the regulatory elements of the T. harzianum transcriptional machinery and their role in the biocontrol by this species. We had previously reported the involvement of the transcription factor THCTF1 in the T. harzianum production of the secondary metabolite 6-pentyl-pyrone, an important volatile compound related to interspecies cross-talk. Here, we performed a subtractive hybridization to explore the genes regulated by THCTF1, allowing us to identify a multiprotein bridging factor 1 (mbf1) homolog. The gene from T. harzianum T34 was isolated and characterized, and the generated Thmbf1 overexpressing transformants were used to investigate the role of this gene in the biocontrol abilities of the fungus against two plant pathogens. The transformants showed a reduced antifungal activity against Fusarium oxysporum f. sp. lycopersici race 2 (FO) and Botrytis cinerea (BC) in confrontation assays on discontinuous medium, indicating that the Thmbf1 gene could affect T. harzianum production of volatile organic compounds (VOC) with antifungal activity. Moreover, cellophane and dialysis membrane assays indicated that Thmbf1 overexpression affected the production of low molecular weight secreted compounds with antifungal activity against FO. Intriguingly, no correlation in the expression profiles, either in rich or minimal medium, was observed between Thmbf1 and the master regulator gene cross-pathway control (cpc1). Greenhouse assays allowed us to evaluate the biocontrol potential of T. harzianum strains against BC and FO on susceptible tomato plants. The wild type strain T34 significantly reduced the necrotic leaf lesions caused by BC while plants treated with the Thmbf1-overexpressing transformants exhibited an increased susceptibility to this pathogen. The percentages of Fusarium wilt disease incidence and values of aboveground dry weight showed that T34 did not have biocontrol activity against FO, at least in the ‘Moneymaker’ tomato variety, and that Thmbf1 overexpression increased the incidence of this disease. Our results show that the Thmbf1 overexpression in T34 negatively affects its biocontrol mechanisms.
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Affiliation(s)
- M Belén Rubio
- Spanish-Portuguese Institute for Agricultural Research (CIALE), Department of Microbiology and Genetics, University of Salamanca, Salamanca, Spain
| | - Alonso J Pardal
- Spanish-Portuguese Institute for Agricultural Research (CIALE), Department of Microbiology and Genetics, University of Salamanca, Salamanca, Spain
| | - Rosa E Cardoza
- Area of Microbiology, University School of Agricultural Engineers, University of León, Ponferrada, Spain
| | - Santiago Gutiérrez
- Area of Microbiology, University School of Agricultural Engineers, University of León, Ponferrada, Spain
| | - Enrique Monte
- Spanish-Portuguese Institute for Agricultural Research (CIALE), Department of Microbiology and Genetics, University of Salamanca, Salamanca, Spain
| | - Rosa Hermosa
- Spanish-Portuguese Institute for Agricultural Research (CIALE), Department of Microbiology and Genetics, University of Salamanca, Salamanca, Spain
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