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Pandey P, Patil M, Priya P, Senthil-Kumar M. When two negatives make a positive: the favorable impact of the combination of abiotic stress and pathogen infection on plants. JOURNAL OF EXPERIMENTAL BOTANY 2024; 75:674-688. [PMID: 37864841 DOI: 10.1093/jxb/erad413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Accepted: 10/20/2023] [Indexed: 10/23/2023]
Abstract
Combined abiotic and biotic stresses modify plant defense signaling, leading to either the activation or suppression of defense responses. Although the majority of combined abiotic and biotic stresses reduce plant fitness, certain abiotic stresses reduce the severity of pathogen infection in plants. Remarkably, certain pathogens also improve the tolerance of some plants to a few abiotic stresses. While considerable research focuses on the detrimental impact of combined stresses on plants, the upside of combined stress remains hidden. This review succinctly discusses the interactions between abiotic stresses and pathogen infection that benefit plant fitness. Various factors that govern the positive influence of combined abiotic stress and pathogen infection on plant performance are also discussed. In addition, we provide a brief overview of the role of pathogens, mainly viruses, in improving plant responses to abiotic stresses. We further highlight the critical nodes in defense signaling that guide plant responses during abiotic stress towards enhanced resistance to pathogens. Studies on antagonistic interactions between abiotic and biotic stressors can uncover candidates in host plant defense that may shield plants from combined stresses.
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Affiliation(s)
- Prachi Pandey
- National Institute of Plant Genome Research, Aruna Asaf Ali Marg, PO Box No. 10531, New Delhi 110067, India
| | - Mahesh Patil
- National Institute of Plant Genome Research, Aruna Asaf Ali Marg, PO Box No. 10531, New Delhi 110067, India
| | - Piyush Priya
- National Institute of Plant Genome Research, Aruna Asaf Ali Marg, PO Box No. 10531, New Delhi 110067, India
| | - Muthappa Senthil-Kumar
- National Institute of Plant Genome Research, Aruna Asaf Ali Marg, PO Box No. 10531, New Delhi 110067, India
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2
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Liu M, Kang B, Wu H, Aranda MA, Peng B, Liu L, Fei Z, Hong N, Gu Q. Transcriptomic and metabolic profiling of watermelon uncovers the role of salicylic acid and flavonoids in the resistance to cucumber green mottle mosaic virus. JOURNAL OF EXPERIMENTAL BOTANY 2023; 74:5218-5235. [PMID: 37235634 DOI: 10.1093/jxb/erad197] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 05/24/2023] [Indexed: 05/28/2023]
Abstract
Understanding the mechanisms underlying plant resistance to virus infections is crucial for viral disease management in agriculture. However, the defense mechanism of watermelon (Citrullus lanatus) against cucumber green mottle mosaic virus (CGMMV) infection remains largely unknown. In this study, we performed transcriptomic, metabolomic, and phytohormone analyses of a CGMMV susceptible watermelon cultivar 'Zhengkang No.2' ('ZK') and a CGMMV resistant wild watermelon accession PI 220778 (PI) to identify the key regulatory genes, metabolites, and phytohormones responsible for CGMMV resistance. We then tested several phytohormones and metabolites for their roles in watermelon CGMMV resistance via foliar application, followed by CGMMV inoculation. Several phenylpropanoid metabolism-associated genes and metabolites, especially those involved in the flavonoid biosynthesis pathway, were found to be significantly enriched in the CGMMV-infected PI plants compared with the CGMMV-infected 'ZK' plants. We also identified a gene encoding UDP-glycosyltransferase (UGT) that is involved in kaempferol-3-O-sophoroside biosynthesis and controls disease resistance, as well as plant height. Additionally, salicylic acid (SA) biogenesis increased in the CGMMV-infected 'ZK' plants, resulting in the activation of a downstream signaling cascade. SA levels in the tested watermelon plants correlated with that of total flavonoids, and SA pre-treatment up-regulated the expression of flavonoid biosynthesis genes, thus increasing the total flavonoid content. Furthermore, application of exogenous SA or flavonoids extracted from watermelon leaves suppressed CGMMV infection. In summary, our study demonstrates the role of SA-induced flavonoid biosynthesis in plant development and CGMMV resistance, which could be used to breed for CGMMV resistance in watermelon.
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Affiliation(s)
- Mei Liu
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China
- Key Laboratory of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Baoshan Kang
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China
| | - Huijie Wu
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China
| | - Miguel A Aranda
- Centro de Edafología y Biología Aplicada del Segura (CEBAS)- CSIC, Apdo. correos 164, 30100 Espinardo, Murcia, Spain
| | - Bin Peng
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China
| | - Liming Liu
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China
| | - Zhangjun Fei
- Boyce Thompson Institute, Ithaca, NY 14853, USA
- United States Department of Agriculture-Agricultural Research Service, Robert W. Holley Center for Agriculture and Health, Ithaca, NY 14853, USA
| | - Ni Hong
- Key Laboratory of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Qinsheng Gu
- National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China
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3
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Jiang T, Zhou T. Unraveling the Mechanisms of Virus-Induced Symptom Development in Plants. PLANTS (BASEL, SWITZERLAND) 2023; 12:2830. [PMID: 37570983 PMCID: PMC10421249 DOI: 10.3390/plants12152830] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 07/22/2023] [Accepted: 07/27/2023] [Indexed: 08/13/2023]
Abstract
Plant viruses, as obligate intracellular parasites, induce significant changes in the cellular physiology of host cells to facilitate their multiplication. These alterations often lead to the development of symptoms that interfere with normal growth and development, causing USD 60 billion worth of losses per year, worldwide, in both agricultural and horticultural crops. However, existing literature often lacks a clear and concise presentation of the key information regarding the mechanisms underlying plant virus-induced symptoms. To address this, we conducted a comprehensive review to highlight the crucial interactions between plant viruses and host factors, discussing key genes that increase viral virulence and their roles in influencing cellular processes such as dysfunction of chloroplast proteins, hormone manipulation, reactive oxidative species accumulation, and cell cycle control, which are critical for symptom development. Moreover, we explore the alterations in host metabolism and gene expression that are associated with virus-induced symptoms. In addition, the influence of environmental factors on virus-induced symptom development is discussed. By integrating these various aspects, this review provides valuable insights into the complex mechanisms underlying virus-induced symptoms in plants, and emphasizes the urgency of addressing viral diseases to ensure sustainable agriculture and food production.
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Affiliation(s)
| | - Tao Zhou
- Department of Plant Pathology, China Agricultural University, Beijing 100193, China
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Jiang T, Du K, Wang P, Wang X, Zang L, Peng D, Chen X, Sun G, Zhang H, Fan Z, Cao Z, Zhou T. Sugarcane mosaic virus orchestrates the lactate fermentation pathway to support its successful infection. FRONTIERS IN PLANT SCIENCE 2023; 13:1099362. [PMID: 36699858 PMCID: PMC9868461 DOI: 10.3389/fpls.2022.1099362] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Accepted: 12/20/2022] [Indexed: 06/17/2023]
Abstract
Viruses often establish their own infection by altering host metabolism. How viruses co-opt plant metabolism to support their successful infection remains an open question. Here, we used untargeted metabolomics to reveal that lactate accumulates immediately before and after robust sugarcane mosaic virus (SCMV) infection. Induction of lactate-involved anaerobic glycolysis is beneficial to SCMV infection. The enzyme activity and transcriptional levels of lactate dehydrogenase (LDH) were up-regulated by SCMV infection, and LDH is essential for robust SCMV infection. Moreover, LDH relocates in viral replicase complexes (VRCs) by interacting with SCMV-encoded 6K2 protein, a key protein responsible for inducing VRCs. Additionally, lactate could promote SCMV infection by suppressing plant defense responses. Taken together, we have revealed a viral strategy to manipulate host metabolism to support replication compartment but also depress the defense response during the process of infection.
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Affiliation(s)
- Tong Jiang
- State Key Laboratory for Agro-Biotechnology, and Ministry of Agriculture and Rural Affairs, Key Laboratory for Pest Monitoring and Green Management, Department of Plant Pathology, China Agricultural University, Beijing, China
- State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding, Hebei, China
| | - Kaitong Du
- State Key Laboratory for Agro-Biotechnology, and Ministry of Agriculture and Rural Affairs, Key Laboratory for Pest Monitoring and Green Management, Department of Plant Pathology, China Agricultural University, Beijing, China
| | - Pei Wang
- State Key Laboratory for Agro-Biotechnology, and Ministry of Agriculture and Rural Affairs, Key Laboratory for Pest Monitoring and Green Management, Department of Plant Pathology, China Agricultural University, Beijing, China
| | - Xinhai Wang
- State Key Laboratory for Agro-Biotechnology, and Ministry of Agriculture and Rural Affairs, Key Laboratory for Pest Monitoring and Green Management, Department of Plant Pathology, China Agricultural University, Beijing, China
| | - Lianyi Zang
- Collaborative Innovation Center of Fruit and Vegetable Quality and Efficient Production in Shandong, Shandong Agricultural University, Tai’an, China
| | - Dezhi Peng
- State Key Laboratory for Agro-Biotechnology, and Ministry of Agriculture and Rural Affairs, Key Laboratory for Pest Monitoring and Green Management, Department of Plant Pathology, China Agricultural University, Beijing, China
| | - Xi Chen
- State Key Laboratory for Agro-Biotechnology, and Ministry of Agriculture and Rural Affairs, Key Laboratory for Pest Monitoring and Green Management, Department of Plant Pathology, China Agricultural University, Beijing, China
| | - Geng Sun
- State Key Laboratory for Agro-Biotechnology, and Ministry of Agriculture and Rural Affairs, Key Laboratory for Pest Monitoring and Green Management, Department of Plant Pathology, China Agricultural University, Beijing, China
| | - Hao Zhang
- State Key Laboratory for Agro-Biotechnology, and Ministry of Agriculture and Rural Affairs, Key Laboratory for Pest Monitoring and Green Management, Department of Plant Pathology, China Agricultural University, Beijing, China
| | - Zaifeng Fan
- State Key Laboratory for Agro-Biotechnology, and Ministry of Agriculture and Rural Affairs, Key Laboratory for Pest Monitoring and Green Management, Department of Plant Pathology, China Agricultural University, Beijing, China
| | - Zhiyan Cao
- State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding, Hebei, China
| | - Tao Zhou
- State Key Laboratory for Agro-Biotechnology, and Ministry of Agriculture and Rural Affairs, Key Laboratory for Pest Monitoring and Green Management, Department of Plant Pathology, China Agricultural University, Beijing, China
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5
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Gorovits R, Shteinberg M, Anfoka G, Czosnek H. Exploiting Virus Infection to Protect Plants from Abiotic Stresses: Tomato Protection by a Begomovirus. PLANTS (BASEL, SWITZERLAND) 2022; 11:2944. [PMID: 36365396 PMCID: PMC9657025 DOI: 10.3390/plants11212944] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/13/2022] [Accepted: 10/25/2022] [Indexed: 06/16/2023]
Abstract
Tomato cultivation is threatened by environmental stresses (e.g., heat, drought) and by viral infection (mainly viruses belonging to the tomato yellow leaf curl virus family-TYLCVs). Unlike many RNA viruses, TYLCV infection does not induce a hypersensitive response and cell death in tomato plants. To ensure a successful infection, TYLCV preserves a suitable cellular environment where it can reproduce. Infected plants experience a mild stress, undergo adaptation and become partially "ready" to exposure to other environmental stresses. Plant wilting and cessation of growth caused by heat and drought is suppressed by TYLCV infection, mainly by down-regulating the heat shock transcription factors, HSFA1, HSFA2, HSFB1 and consequently, the expression of HSF-regulated stress genes. In particular, TYLCV captures HSFA2 by inducing protein complexes and aggregates, thus attenuating an acute stress response, which otherwise causes plant death. Viral infection mitigates the increase in stress-induced metabolites, such as carbohydrates and amino acids, and leads to their reallocation from shoots to roots. Under high temperatures and water deficit, TYLCV induces plant cellular homeostasis, promoting host survival. Thus, this virus-plant interaction is beneficial for both partners.
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Affiliation(s)
- Rena Gorovits
- Institute of Plant Sciences and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel
| | - Moshe Shteinberg
- Institute of Plant Sciences and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel
| | - Ghandi Anfoka
- Faculty of Agricultural Technology, Al Balqa’ University, Al-Salt 10117, Jordan
| | - Henryk Czosnek
- Institute of Plant Sciences and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 7610001, Israel
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More P, Agarwal P, Agarwal PK. The Jatropha leaf curl Gujarat virus on infection in Jatropha regulates the sugar and tricarboxylic acid cycle metabolic pathways. 3 Biotech 2022; 12:275. [PMID: 36110567 PMCID: PMC9468196 DOI: 10.1007/s13205-022-03306-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 08/10/2022] [Indexed: 11/25/2022] Open
Abstract
Jatropha, a popular biodiesel crop, suffers severe losses due to Jatropha leaf curl Gujarat virus (JLCuGV) infection in Gujarat (India). Metabolite profiling can help to understand the plant's innate immune response to geminivirus infection. Our study aims to compare metabolic profiles of an infected and healthy plant to unravel the changes in biochemical pathways on geminivirus infection in Jatropha. Gas chromatography-mass spectrometry (GC-MS) analysis was performed in healthy and infected tissue of Jatropha field plants which were identified to be infected with geminivirus. GC-MS analysis revealed that the metabolites like sugars, polyols, carboxylic acids, fatty acids, polyphenols, and amino acids were regulated on JLCuGV infection. The sugars (glucose, sucrose, and fructose) increased, while carboxylic acids (malic acid, citric acid and quinic acid) and polyols (galactinol, butanetriol, triethylene glycol, myo-inositol, erythritol) decreased remarkably in infected Jatropha tissue. All these metabolic variations indicated that sugar metabolism and tricarboxylic acid (TCA) cycle pathways are regulated as a defense response and a disease development response to geminivirus infection in Jatropha.
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Affiliation(s)
- Prashant More
- Plant Omics Division, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific & Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar, Gujarat 364 002 India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002 India
| | - Parinita Agarwal
- Plant Omics Division, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific & Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar, Gujarat 364 002 India
| | - Pradeep K. Agarwal
- Plant Omics Division, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific & Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar, Gujarat 364 002 India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002 India
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7
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Bi X, Guo H, Li X, Zheng L, An M, Xia Z, Wu Y. A novel strategy for improving watermelon resistance to cucumber green mottle mosaic virus by exogenous boron application. MOLECULAR PLANT PATHOLOGY 2022; 23:1361-1380. [PMID: 35671152 PMCID: PMC9366068 DOI: 10.1111/mpp.13234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 05/10/2022] [Accepted: 05/11/2022] [Indexed: 06/15/2023]
Abstract
The molecular mode controlling cucumber green mottle mosaic virus (CGMMV)-induced watermelon blood flesh disease (WBFD) is largely unknown. In this study, we have found that application of exogenous boron suppressed CGMMV infection in watermelon fruit and alleviated WBFD symptoms. Our transcriptome analysis showed that the most up-regulated differentially expressed genes (DEGs) were associated with polyamine and auxin biosynthesis, abscisic acid catabolism, defence-related pathways, cell wall modification, and energy and secondary metabolism, while the down-regulated DEGs were mostly involved in ethylene biosynthesis, cell wall catabolism, and plasma membrane functions. Our virus-induced gene silencing results showed that silencing of SPDS expression in watermelon resulted in a higher putrescine content and an inhibited CGMMV infection correlating with no WBFD symptoms. SBT and TUBB1 were also required for CGMMV infection. In contrast, silencing of XTH23 and PE/PEI7 (low-level lignin, cellulose and pectin) and ATPS1 (low-level glutathione) promoted CGMMV accumulation. Furthermore, RAP2-3, MYB6, WRKY12, H2A, and DnaJ11 are likely to participate in host antiviral resistance. In addition, a higher (spermidine + spermine):putrescine ratio, malondialdehyde content, and lactic acid content were responsible for fruit decay and acidification. Our results provide new knowledge on the roles of boron in watermelon resistance to CGMMV-induced WBFD. This new knowledge can be used to design better control methods for CGMMV in the field and to breed CGMMV resistant watermelon and other cucurbit crops.
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Affiliation(s)
- Xinyue Bi
- Liaoning Key Laboratory of Plant Pathology, College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
| | - Huiyan Guo
- Liaoning Key Laboratory of Plant Pathology, College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
| | - Xiaodong Li
- Liaoning Key Laboratory of Plant Pathology, College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
- Centre for Biological Disaster Prevention and ControlNational Forestry and Grassland AdministrationShenyangChina
| | - Lijiao Zheng
- Xinmin City Agricultural Technology Extension CentreShenyangChina
| | - Mengnan An
- Liaoning Key Laboratory of Plant Pathology, College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
| | - Zihao Xia
- Liaoning Key Laboratory of Plant Pathology, College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
| | - Yuanhua Wu
- Liaoning Key Laboratory of Plant Pathology, College of Plant ProtectionShenyang Agricultural UniversityShenyangChina
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8
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Yang Z, Zhang H, Tan X, Wei Z, Wen C, Sun Z, Sun B, Chen J. Insights Into the Effect of Rice Stripe Virus P2 on Rice Defense by Comparative Proteomic Analysis. Front Microbiol 2022; 13:897589. [PMID: 35747367 PMCID: PMC9209781 DOI: 10.3389/fmicb.2022.897589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 05/09/2022] [Indexed: 11/29/2022] Open
Abstract
Rice stripe virus (RSV) has a serious effect on rice production. Our previous research had shown that RSV P2 plays important roles in RSV infection, so in order to further understand the effect of P2 on rice, we used Tandem Mass Tag (TMT) quantitative proteomics experimental system to analyze the changes of protein in transgenic rice expressing P2 for the first time. The results of proteomics showed that a total of 4,767 proteins were identified, including 198 up-regulated proteins and 120 down-regulated proteins. Functional classification results showed that differentially expressed proteins (DEPs) were mainly localized in chloroplasts and mainly involved in the metabolic pathways. Functional enrichment results showed that DEPs are mainly involved in RNA processing and splicing. We also verified the expression of several DEPs at the mRNA level and the interaction of a transcription factor (B7EPB8) with RSV P2. This research is the first time to use proteomics technology to explore the mechanism of RSV infection in rice with the RSV P2 as breakthrough point. Our findings provide valuable information for the study of RSV P2 and RSV infection mechanism.
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Affiliation(s)
- Zihang Yang
- College of Plant Protection, Henan Agricultural University, Zhengzhou, China
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo, China
| | - Hehong Zhang
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo, China
| | - Xiaoxiang Tan
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo, China
| | - Zhongyan Wei
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo, China
| | - Caiyi Wen
- College of Plant Protection, Henan Agricultural University, Zhengzhou, China
| | - Zongtao Sun
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo, China
| | - Bingjian Sun
- College of Plant Protection, Henan Agricultural University, Zhengzhou, China
- *Correspondence: Bingjian Sun,
| | - Jianping Chen
- College of Plant Protection, Henan Agricultural University, Zhengzhou, China
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province, Institute of Plant Virology, Ningbo University, Ningbo, China
- Jianping Chen,
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Water Deficit Improves Reproductive Fitness in Nicotiana benthamiana Plants Infected by Cucumber mosaic virus. PLANTS 2022; 11:plants11091240. [PMID: 35567241 PMCID: PMC9105947 DOI: 10.3390/plants11091240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 04/19/2022] [Accepted: 04/27/2022] [Indexed: 11/17/2022]
Abstract
Plants are concurrently exposed to biotic and abiotic stresses, including infection by viruses and drought. Combined stresses result in plant responses that are different from those observed for each individual stress. We investigated compensatory effects induced by virus infection on the fitness of hosts grown under water deficit, and the hypothesis that water deficit improves tolerance, estimated as reproductive fitness, to virus infection. Our results show that infection by Turnip mosaic virus (TuMV) or Cucumber mosaic virus (CMV) promotes drought tolerance in Arabidopsis thaliana and Nicotiana benthamiana. However, neither CMV nor TuMV had a positive impact on host reproductive fitness following withdrawal of water, as determined by measuring the number of individuals producing seeds, seed grains, and seed germination rates. Importantly, infection by CMV but not by TuMV improved the reproductive fitness of N. benthamiana plants when exposed to drought compared to watered, virus-infected plants. However, no such conditional phenotype was found in Arabidopsis plants infected with CMV. Water deficit did not affect the capacity of infected plants to transmit CMV through seeds. These findings highlight a conditional improvement in biological efficacy of N. benthamiana plants infected with CMV under water deficit, and lead to the prediction that plants can exhibit increased tolerance to specific viruses under some of the projected climate change scenarios.
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10
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Mishra R, Shteinberg M, Shkolnik D, Anfoka G, Czosnek H, Gorovits R. Interplay between abiotic (drought) and biotic (virus) stresses in tomato plants. MOLECULAR PLANT PATHOLOGY 2022; 23:475-488. [PMID: 34970822 PMCID: PMC8916204 DOI: 10.1111/mpp.13172] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 11/22/2021] [Accepted: 11/22/2021] [Indexed: 05/08/2023]
Abstract
With climate warming, drought becomes a vital challenge for agriculture. Extended drought periods affect plant-pathogen interactions. We demonstrate an interplay in tomato between drought and infection with tomato yellow leaf curl virus (TYLCV). Infected plants became more tolerant to drought, showing plant readiness to water scarcity by reducing metabolic activity in leaves and increasing it in roots. Reallocation of osmolytes, such as carbohydrates and amino acids, from shoots to roots suggested a role of roots in protecting infected tomatoes against drought. To avoid an acute response possibly lethal for the host organism, TYLCV down-regulated the drought-induced activation of stress response proteins and metabolites. Simultaneously, TYLCV promoted the stabilization of osmoprotectants' patterns and water balance parameters, resulting in the development of buffering conditions in infected plants subjected to prolonged stress. Drought-dependent decline of TYLCV amounts was correlated with HSFA1-controlled activation of autophagy, mostly in the roots. The tomato response to combined drought and TYLCV infection points to a mutual interaction between the plant host and its viral pathogen.
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Affiliation(s)
- Ritesh Mishra
- Institute of Plant Sciences and Genetics in AgricultureRobert H. Smith Faculty of Agriculture, Food and EnvironmentThe Hebrew University of JerusalemRehovotIsrael
| | - Moshik Shteinberg
- Institute of Plant Sciences and Genetics in AgricultureRobert H. Smith Faculty of Agriculture, Food and EnvironmentThe Hebrew University of JerusalemRehovotIsrael
| | - Doron Shkolnik
- Institute of Plant Sciences and Genetics in AgricultureRobert H. Smith Faculty of Agriculture, Food and EnvironmentThe Hebrew University of JerusalemRehovotIsrael
| | - Ghandi Anfoka
- Faculty of Agricultural TechnologyAl Balqa' UniversityAl‐SaltJordan
| | - Henryk Czosnek
- Institute of Plant Sciences and Genetics in AgricultureRobert H. Smith Faculty of Agriculture, Food and EnvironmentThe Hebrew University of JerusalemRehovotIsrael
| | - Rena Gorovits
- Institute of Plant Sciences and Genetics in AgricultureRobert H. Smith Faculty of Agriculture, Food and EnvironmentThe Hebrew University of JerusalemRehovotIsrael
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Rodríguez-Verástegui LL, Ramírez-Zavaleta CY, Capilla-Hernández MF, Gregorio-Jorge J. Viruses Infecting Trees and Herbs That Produce Edible Fleshy Fruits with a Prominent Value in the Global Market: An Evolutionary Perspective. PLANTS (BASEL, SWITZERLAND) 2022; 11:203. [PMID: 35050091 PMCID: PMC8778216 DOI: 10.3390/plants11020203] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 09/20/2021] [Accepted: 09/23/2021] [Indexed: 05/12/2023]
Abstract
Trees and herbs that produce fruits represent the most valuable agricultural food commodities in the world. However, the yield of these crops is not fully achieved due to biotic factors such as bacteria, fungi, and viruses. Viruses are capable of causing alterations in plant growth and development, thereby impacting the yield of their hosts significantly. In this work, we first compiled the world's most comprehensive list of known edible fruits that fits our definition. Then, plant viruses infecting those trees and herbs that produce fruits with commercial importance in the global market were identified. The identified plant viruses belong to 30 families, most of them containing single-stranded RNA genomes. Importantly, we show the overall picture of the host range for some virus families following an evolutionary approach. Further, the current knowledge about plant-virus interactions, focusing on the main disorders they cause, as well as yield losses, is summarized. Additionally, since accurate diagnosis methods are of pivotal importance for viral diseases control, the current and emerging technologies for the detection of these plant pathogens are described. Finally, the most promising strategies employed to control viral diseases in the field are presented, focusing on solutions that are long-lasting.
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Affiliation(s)
| | - Candy Yuriria Ramírez-Zavaleta
- Cuerpo Académico Procesos Biotecnológicos, Universidad Politécnica de Tlaxcala, Av. Universidad Politécnica 1, San Pedro Xalcaltzinco 90180, Mexico; (C.Y.R.-Z.); (M.F.C.-H.)
| | - María Fernanda Capilla-Hernández
- Cuerpo Académico Procesos Biotecnológicos, Universidad Politécnica de Tlaxcala, Av. Universidad Politécnica 1, San Pedro Xalcaltzinco 90180, Mexico; (C.Y.R.-Z.); (M.F.C.-H.)
| | - Josefat Gregorio-Jorge
- Consejo Nacional de Ciencia y Tecnología, Universidad Politécnica de Tlaxcala, Av. Insurgentes Sur 1582, Col. Crédito Constructor, Ciudad de Mexico 03940, Mexico
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Akbar S, Yao W, Qin L, Yuan Y, Powell CA, Chen B, Zhang M. Comparative Analysis of Sugar Metabolites and Their Transporters in Sugarcane Following Sugarcane mosaic virus (SCMV) Infection. Int J Mol Sci 2021; 22:ijms222413574. [PMID: 34948367 PMCID: PMC8707430 DOI: 10.3390/ijms222413574] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Revised: 12/14/2021] [Accepted: 12/15/2021] [Indexed: 11/19/2022] Open
Abstract
Sugarcane mosaic virus (SCMV) is one of the major pathogens of sugarcane. SCMV infection causes dynamic changes in plant cells, including decreased photosynthetic rate, respiration, and sugar metabolism. To understand the basics of pathogenicity mechanism, we performed transcriptome and proteomics analysis in two sugarcane genotypes (Badila: susceptible to SCMV and B-48: SCMV resistant). Using Saccharum spontaneum L. genome as a reference, we identified the differentially expressed genes (DEGs) and differentially expressed proteins (DEPs) that participate in sugar metabolism, transport of their metabolites, and Carbohydrate Activating enZYmes (CAZymes). Sequencing data revealed 287 DEGs directly or indirectly involved in sugar metabolism, transport, and storage, while 323 DEGs are associated with CAZymes. Significant upregulation of glucose, sucrose, fructose, starch, and SWEET-related transcripts was observed in the Badila after infection of SCMV. B-48 showed resistance against SCMV with a limited number of sugar transcripts up-regulation at the post-infection stage. For CAZymes, only glycosyltransferase (GT)1 and glycosyl hydrolase (GH)17 were upregulated in B-48. Regulation of DEGs was analyzed at the proteomics level as well. Starch, fructose, glucose, GT1, and GH17 transcripts were expressed at the post-translational level. We verified our transcriptomic results with proteomics and qPCR data. Comprehensively, this study proved that Badila upregulated sugar metabolizing and transporting transcripts and proteins, which enhance virus multiplication and infectionl.
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Affiliation(s)
- Sehrish Akbar
- Guangxi Key Laboratory for Sugarcane Biology & State Key Laboratory for Conservation and Utilization of Agro Bioresources, Guangxi University, Nanning 530005, China; (S.A.); (W.Y.); (L.Q.); (Y.Y.); (B.C.)
| | - Wei Yao
- Guangxi Key Laboratory for Sugarcane Biology & State Key Laboratory for Conservation and Utilization of Agro Bioresources, Guangxi University, Nanning 530005, China; (S.A.); (W.Y.); (L.Q.); (Y.Y.); (B.C.)
| | - Lifang Qin
- Guangxi Key Laboratory for Sugarcane Biology & State Key Laboratory for Conservation and Utilization of Agro Bioresources, Guangxi University, Nanning 530005, China; (S.A.); (W.Y.); (L.Q.); (Y.Y.); (B.C.)
| | - Yuan Yuan
- Guangxi Key Laboratory for Sugarcane Biology & State Key Laboratory for Conservation and Utilization of Agro Bioresources, Guangxi University, Nanning 530005, China; (S.A.); (W.Y.); (L.Q.); (Y.Y.); (B.C.)
| | | | - Baoshan Chen
- Guangxi Key Laboratory for Sugarcane Biology & State Key Laboratory for Conservation and Utilization of Agro Bioresources, Guangxi University, Nanning 530005, China; (S.A.); (W.Y.); (L.Q.); (Y.Y.); (B.C.)
| | - Muqing Zhang
- Guangxi Key Laboratory for Sugarcane Biology & State Key Laboratory for Conservation and Utilization of Agro Bioresources, Guangxi University, Nanning 530005, China; (S.A.); (W.Y.); (L.Q.); (Y.Y.); (B.C.)
- IRREC-IFAS, University of Florida, Fort Pierce, FL 34945, USA;
- Correspondence:
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Li S, Wu ZG, Zhou Y, Dong ZF, Fei X, Zhou CY, Li SF. Changes in metabolism modulate induced by viroid infection in the orchid Dendrobium officinale. Virus Res 2021; 308:198626. [PMID: 34780884 DOI: 10.1016/j.virusres.2021.198626] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 11/01/2021] [Accepted: 11/06/2021] [Indexed: 12/15/2022]
Abstract
Dendrobium officinale is an important traditional Chinese medicinal herb, and the stem tissue is the main medicinal that is harvested from D. officinale. Recently, the first viroid was identified from D. officinale in China, and it has been named Dendrobium viroid (DVd). Whether DVd interferes with metabolic pathways in dendrobium plants and affects the medicinal value of the host is unknown. In this study, metabolomics data from stem tissues supported by transcriptome studies were used to investigate how metabolism modulate of D. officinale is altered by DVd infection. Our results show that metabolism of D. officinale is reprogrammed in many ways during DVd infection, and this is reflected by significant changes in the levels of flavonoids, alkaloids, and phenolic acids. Furthermore, we found that DVd infection significantly decreased the accumulation of flavonoids and alkaloid metabolites in infected stems, and the decreases in these metabolites appears to affect the medicinal components of the infected plants, weakening the host antiviral immune response as well. Conversely, phenolic acids occupy a larger proportion of the up-regulated metabolites from DVd infection in comparison with the mock-inoculated control, and the increase in the total phenolic acids may reflect the activation of the pathogen defense response in D. officinale. Taken together, our results provide an interesting overview and give a better understanding of the relationship between metabolism and DVd infection in the orchid D. officinale.
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Affiliation(s)
- Shuai Li
- Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China; State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China; Citrus Research Institute, Chinese Academy of Agricultural Sciences/Southwest University, Chongqing 400700, China
| | - Zhi-Gang Wu
- School of Pharmacy, Wenzhou Medical University, Wenzhou, 325035, China
| | - Ying Zhou
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China; Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
| | - Zhen-Fei Dong
- College of Horticulture, China Agricultural University, Beijing 100193, China
| | - Xuan Fei
- School of Pharmacy, Wenzhou Medical University, Wenzhou, 325035, China
| | - Chang-Yong Zhou
- Citrus Research Institute, Chinese Academy of Agricultural Sciences/Southwest University, Chongqing 400700, China
| | - Shi-Fang Li
- Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China; State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China.
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Differential Triggering of the Phenylpropanoid Biosynthetic Pathway Key Genes Transcription upon Cold Stress and Viral Infection in Tomato Leaves. HORTICULTURAE 2021. [DOI: 10.3390/horticulturae7110448] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Plants develop a plethora of defense strategies during their acclimation and interactions with various environmental stresses. Secondary metabolites play a pivotal role in the processes during stress acclimation, therefore deciphering their relevant responses exchange the interpretation of the underlying molecular mechanisms that may contribute to improved adaptability and efficacy. In the current study, tomato plants were exposed to short-term cold stress (5 °C for 16 h) or inoculated (20 d) with either Cucumber Mosaic Virus (CMV) or Potato Virus Y (PVY). Responses were recorded via the assessments of leaf total phenolic (TP) content, total flavonoid (TF) levels, and phenylalanine ammonia-lyase (PAL) enzyme activity. The transcription of the gene families regulating the core phenylpropanoid biosynthetic pathway (PBP) at an early (PAL, cinnamic acid 4-hydroxylase, 4-coumarate-CoA ligase) or late (chalcone synthase and flavonol synthase) stage was also evaluated. The results showed that cold stress stimulated an increase in TP and TF contents, while PAL enzyme activity was also elevated compared to viral infection. Besides genes transcription of the enzymes involved in the core PBP was mostly induced by cold stress, whereas transcription of the genes regulating flavonoid biosynthesis was mainly triggered by viral infection. In conclusion, abiotic and biotic stressors induced differential regulation of the core PBP and flavonoid biosynthetic metabolism. Taking the above into consideration, our results highlight the complexity of tomato responses to diverse stimuli allowing for better elucidation of stress tolerance mechanisms at this crop.
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Zechmann B, Müller M, Möstl S, Zellnig G. Three-dimensional quantitative imaging of Tobacco mosaic virus and Zucchini yellow mosaic virus induced ultrastructural changes. PROTOPLASMA 2021; 258:1201-1211. [PMID: 33619654 DOI: 10.1007/s00709-021-01626-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 02/12/2021] [Indexed: 06/12/2023]
Abstract
Two-dimensional ultrastructural changes of Tobacco mosaic virus (TMV) and Zucchini yellow mosaic virus (ZYMV) in tobacco and pumpkin plants, respectively, are well studied. To provide 3D data, representative control and infected cells were reconstructed using serial sectioning and transmission electron microscopy. Quantitative data of 3D ultrastructural changes were then extracted from the cytosol and organelles by image analysis. While TMV induced the accumulation of an average of 40 virus inclusion bodies in the cytosol, which covered about 13% of the cell volume, ZYMV caused the accumulation of an average of 1752 cylindrical inclusions in the cytosol, which covered about 2.7% of the total volume of the cell. TMV infection significantly decreased the number and size of mitochondria (- 49 and - 20%) and peroxisomes (- 62 and - 28%) of the reconstructed cell. The reconstructed ZYMV-infected cell contained more (105%) and larger (109%) mitochondria when compared to the control cell. While the reconstructed TMV-infected cell contained larger (20%) and the ZYMV-infected smaller (19%) chloroplasts, both contained less chloroplasts (- 40% for TMV and - 23% for ZYMV). In chloroplasts, the volume of starch and plastoglobules increased (664% and 150% for TMV and 1324% and 1300% for ZYMV) when compared to the control. The latter was correlated with a decrease in the volume of thylakoids in the reconstructed ZYMV-infected cell (- 31%) indicating that degradation products from thylakoids are transported and stored in plastoglobules. Summing up, the data collected in this study give a comprehensive overview of 3D changes induced by TMV and ZYMV in plants.
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Affiliation(s)
- Bernd Zechmann
- Center for Microscopy and Imaging, Baylor University, One Bear Place #97046, Waco, TX, 76798, USA.
| | - Maria Müller
- Institute of Biology, Plant Sciences, University of Graz, NAWI Graz, Schubertstrasse 51, 8010, Graz, Austria
| | - Stefan Möstl
- Institute of Biology, Plant Sciences, University of Graz, NAWI Graz, Schubertstrasse 51, 8010, Graz, Austria
| | - Günther Zellnig
- Institute of Biology, Plant Sciences, University of Graz, NAWI Graz, Schubertstrasse 51, 8010, Graz, Austria
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Shteinberg M, Mishra R, Anfoka G, Altaleb M, Brotman Y, Moshelion M, Gorovits R, Czosnek H. Tomato Yellow Leaf Curl Virus (TYLCV) Promotes Plant Tolerance to Drought. Cells 2021; 10:2875. [PMID: 34831098 PMCID: PMC8616339 DOI: 10.3390/cells10112875] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2021] [Revised: 10/13/2021] [Accepted: 10/22/2021] [Indexed: 11/16/2022] Open
Abstract
A growing body of research points to a positive interplay between viruses and plants. Tomato yellow curl virus (TYLCV) is able to protect tomato host plants against extreme drought. To envisage the use of virus protective capacity in agriculture, TYLCV-resistant tomato lines have to be infected first with the virus before planting. Such virus-resistant tomato plants contain virus amounts that do not cause disease symptoms, growth inhibition, or yield loss, but are sufficient to modify the metabolism of the plant, resulting in improved tolerance to drought. This phenomenon is based on the TYLCV-dependent stabilization of amounts of key osmoprotectants induced by drought (soluble sugars, amino acids, and proteins). Although in infected TYLCV-susceptible tomatoes, stress markers also show an enhanced stability, in infected TYLCV-resistant plants, water balance and osmolyte homeostasis reach particularly high levels. These tomato plants survive long periods of time during water withholding. However, after recovery to normal irrigation, they produce fruits which are not exposed to drought, similarly to the control plants. Using these features, it might be possible to cultivate TYLCV-resistant plants during seasons characterized by water scarcity.
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Affiliation(s)
- Moshik Shteinberg
- Robert H. Smith Faculty of Agriculture, Food and Environment, Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, Rehovot 7610001, Israel; (M.S.); (R.M.); (M.M.); (R.G.)
| | - Ritesh Mishra
- Robert H. Smith Faculty of Agriculture, Food and Environment, Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, Rehovot 7610001, Israel; (M.S.); (R.M.); (M.M.); (R.G.)
| | - Ghandi Anfoka
- Faculty of Agricultural Technology, Al-Balqa Applied University, Al-Salt 19117, Jordan; (G.A.); (M.A.)
| | - Miassar Altaleb
- Faculty of Agricultural Technology, Al-Balqa Applied University, Al-Salt 19117, Jordan; (G.A.); (M.A.)
| | - Yariv Brotman
- Faculty of Life Sciences, Ben Gurion University of the Negev, POB 653, Beer-Sheva 8410501, Israel;
| | - Menachem Moshelion
- Robert H. Smith Faculty of Agriculture, Food and Environment, Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, Rehovot 7610001, Israel; (M.S.); (R.M.); (M.M.); (R.G.)
| | - Rena Gorovits
- Robert H. Smith Faculty of Agriculture, Food and Environment, Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, Rehovot 7610001, Israel; (M.S.); (R.M.); (M.M.); (R.G.)
| | - Henryk Czosnek
- Robert H. Smith Faculty of Agriculture, Food and Environment, Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, Rehovot 7610001, Israel; (M.S.); (R.M.); (M.M.); (R.G.)
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Zhang W, Qiu Y, Zhou L, Yin J, Wang L, Zhi H, Xu K. Development of a Viral RdRp-Assisted Gene Silencing System and Its Application in the Identification of Host Factors of Plant (+)RNA Virus. Front Microbiol 2021; 12:682921. [PMID: 34394029 PMCID: PMC8358433 DOI: 10.3389/fmicb.2021.682921] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 06/24/2021] [Indexed: 11/13/2022] Open
Abstract
Gene silencing induced by hairpin RNA or virus infection expression is one of the major tools in genetics studies in plants. However, when dealing with essential genes, virus-induced gene silencing (VIGS) and transgenic expression of hairpin RNA could lead to plant death, while transient expression of hairpin RNA in leaves is often less competent in downregulating target gene mRNA levels. Here, we developed a transient double-stranded RNA (dsRNA) expression system assisted by a modified viral RNA-dependent RNA polymerase (RdRp) in plant leaves. We show that this system is more effective in inducing gene silencing than the intron-spliced hairpin RNA expression. Furthermore, by using this system, we tested the role of the early secretory pathway during infection of Soybean mosaic potyvirus (SMV). We found that key components of the coat protein complex II vesicles are required for the multiplication of SMV. Overall, this dsRNA-based gene silencing system is effective in downregulating plant gene expression and can be used to identify host genes involved in plant-virus interactions.
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Affiliation(s)
- Wang Zhang
- Jiangsu Key Laboratory for Microbes and Functional Genomics, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Yanglin Qiu
- Jiangsu Key Laboratory for Microbes and Functional Genomics, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Lingyun Zhou
- Jiangsu Key Laboratory for Microbes and Functional Genomics, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Jinlong Yin
- National Center for Soybean Improvement, National Key Laboratory for Crop Genetics and Germplasm Enhancement, Key Laboratory of Biology and Genetic Improvement of Soybean-Ministry of Agriculture, Nanjing Agricultural University, Nanjing, China
| | - Liqun Wang
- National Center for Soybean Improvement, National Key Laboratory for Crop Genetics and Germplasm Enhancement, Key Laboratory of Biology and Genetic Improvement of Soybean-Ministry of Agriculture, Nanjing Agricultural University, Nanjing, China
| | - Haijian Zhi
- National Center for Soybean Improvement, National Key Laboratory for Crop Genetics and Germplasm Enhancement, Key Laboratory of Biology and Genetic Improvement of Soybean-Ministry of Agriculture, Nanjing Agricultural University, Nanjing, China
| | - Kai Xu
- Jiangsu Key Laboratory for Microbes and Functional Genomics, College of Life Sciences, Nanjing Normal University, Nanjing, China
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Rubio B, Fernandez O, Cosson P, Berton T, Caballero M, Lion R, Roux F, Bergelson J, Gibon Y, Schurdi-Levraud V. Metabolic Profile Discriminates and Predicts Arabidopsis Susceptibility to Virus under Field Conditions. Metabolites 2021; 11:metabo11040230. [PMID: 33918649 PMCID: PMC8069729 DOI: 10.3390/metabo11040230] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 03/27/2021] [Accepted: 04/02/2021] [Indexed: 12/13/2022] Open
Abstract
As obligatory parasites, plant viruses alter host cellular metabolism. There is a lack of information on the variability of virus-induced metabolic responses among genetically diverse plants in a natural context with daily changing conditions. To decipher the metabolic landscape of plant-virus interactions in a natural setting, twenty-six and ten accessions of Arabidopsis thaliana were inoculated with Turnip mosaic virus (TuMV), in two field experiments over 2 years. The accessions were measured for viral accumulation, above-ground biomass, targeted and untargeted metabolic profiles. The phenotypes of the accessions ranged from susceptibility to resistance. Susceptible and resistant accessions were shown to have different metabolic routes after inoculation. Susceptible genotypes accumulate primary and secondary metabolites upon infection, at the cost of hindered growth. Twenty-one metabolic signatures significantly accumulated in resistant accessions whereas they maintained their growth as mock-inoculated plants without biomass penalty. Metabolic content was demonstrated to discriminate and be highly predictive of the susceptibility of inoculated Arabidopsis. This study is the first to describe the metabolic landscape of plant-virus interactions in a natural setting and its predictive link to susceptibility. It provides new insights on plant-virus interactions. In this undomesticated species and in ecologically realistic conditions, growth and resistance are in a permanent conversation.
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Affiliation(s)
- Bernadette Rubio
- Université de Bordeaux, INRAE, Biologie du Fruit et Pathologie, UMR 1332, F-33140 Villenave d’Ornon, France; (B.R.); (O.F.); (P.C.); (T.B.); (M.C.); (R.L.); (Y.G.)
| | - Olivier Fernandez
- Université de Bordeaux, INRAE, Biologie du Fruit et Pathologie, UMR 1332, F-33140 Villenave d’Ornon, France; (B.R.); (O.F.); (P.C.); (T.B.); (M.C.); (R.L.); (Y.G.)
| | - Patrick Cosson
- Université de Bordeaux, INRAE, Biologie du Fruit et Pathologie, UMR 1332, F-33140 Villenave d’Ornon, France; (B.R.); (O.F.); (P.C.); (T.B.); (M.C.); (R.L.); (Y.G.)
| | - Thierry Berton
- Université de Bordeaux, INRAE, Biologie du Fruit et Pathologie, UMR 1332, F-33140 Villenave d’Ornon, France; (B.R.); (O.F.); (P.C.); (T.B.); (M.C.); (R.L.); (Y.G.)
| | - Mélodie Caballero
- Université de Bordeaux, INRAE, Biologie du Fruit et Pathologie, UMR 1332, F-33140 Villenave d’Ornon, France; (B.R.); (O.F.); (P.C.); (T.B.); (M.C.); (R.L.); (Y.G.)
| | - Roxane Lion
- Université de Bordeaux, INRAE, Biologie du Fruit et Pathologie, UMR 1332, F-33140 Villenave d’Ornon, France; (B.R.); (O.F.); (P.C.); (T.B.); (M.C.); (R.L.); (Y.G.)
| | - Fabrice Roux
- CNRS, INRAE, Université de Toulouse, LIPM, F-31320 Castanet-Tolosan, France;
| | - Joy Bergelson
- Ecology & Evolution, University of Chicago, 1101 E 57th St, Chicago, IL 60637, USA;
| | - Yves Gibon
- Université de Bordeaux, INRAE, Biologie du Fruit et Pathologie, UMR 1332, F-33140 Villenave d’Ornon, France; (B.R.); (O.F.); (P.C.); (T.B.); (M.C.); (R.L.); (Y.G.)
| | - Valérie Schurdi-Levraud
- Université de Bordeaux, INRAE, Biologie du Fruit et Pathologie, UMR 1332, F-33140 Villenave d’Ornon, France; (B.R.); (O.F.); (P.C.); (T.B.); (M.C.); (R.L.); (Y.G.)
- Correspondence:
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More P, Agarwal P, Anand A, Sanan-Mishra N, Agarwal PK. Artificial miRNA mediated resistance in tobacco against Jatropha leaf curl Gujarat virus by targeting RNA silencing suppressors. Sci Rep 2021; 11:890. [PMID: 33441589 PMCID: PMC7806619 DOI: 10.1038/s41598-020-79134-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 12/03/2020] [Indexed: 11/09/2022] Open
Abstract
The leaf curl disease of Jatropha caused by geminiviruses results in heavy economic losses. In the present study, we report the identification of a new strain of a Jatropha leaf curl Gujarat virus (JLCuGV), which encodes six ORFs with each one having RNA silencing suppressor activity. Therefore, three artificial microRNAs (amiRNAs; C1/C4, C2/C3 and V1/V2) were designed employing overlapping regions, each targeting two ORFs of JLCuGV genomic DNA and transformed in tobacco. The C1/C4 and C2/C3 amiRNA transgenics were resistant while V1/V2 amiRNA transgenics were tolerant against JLCuGV. The relative level of amiRNA inversely related to viral load indicating a correlation with disease resistance. The assessment of photosynthetic parameters suggests that the transgenics perform significantly better in response to JLCuGV infiltration as compared to wild type (WT). The metabolite contents were not altered remarkably in amiRNA transgenics, but sugar metabolism and tricarboxylic acid (TCA) cycle showed noticeable changes in WT on virus infiltration. The overall higher methylation and demethylation observed in amiRNA transgenics correlated with decreased JLCuGV accumulation. This study demonstrates that amiRNA transgenics showed enhanced resistance to JLCuGV while efficiently maintaining normalcy in their photosynthesis and metabolic pathways as well as homeostasis in the methylation patterns.
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Affiliation(s)
- Prashant More
- Plant Omics Division, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, 364 002, Bhavnagar, Gujarat, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Parinita Agarwal
- Plant Omics Division, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, 364 002, Bhavnagar, Gujarat, India.
| | - Abhishek Anand
- Plant RNAi Biology Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi, 110 067, India
| | - Neeti Sanan-Mishra
- Plant RNAi Biology Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi, 110 067, India
| | - Pradeep K Agarwal
- Plant Omics Division, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, 364 002, Bhavnagar, Gujarat, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
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Bednarek R, David M, Fuentes S, Kreuze J, Fei Z. Transcriptome analysis provides insights into the responses of sweet potato to sweet potato virus disease (SPVD). Virus Res 2021; 295:198293. [PMID: 33412165 PMCID: PMC7985617 DOI: 10.1016/j.virusres.2020.198293] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 12/19/2020] [Accepted: 12/28/2020] [Indexed: 12/27/2022]
Abstract
Transcriptome responses in sweet potato infected with SPCSV and/or SPFMV were studied. Numerous genes, miRNAs and phasiRNAs were responsive mainly to the dual infection. Salicylic acid-mediated pathways play important roles in antiviral defense responses.
Sweet potato (Ipomoea batatas) ranks among the most important crops in the world and provides nutritional and economic sustainability for subsistence farmers in sub-Saharan Africa. Its production is mainly constrained by sweet potato virus disease (SPVD) caused by the coinfection of two positive-sense single-stranded RNA viruses, sweet potato chlorotic stunt virus (SPCSV) and sweet potato feathery mottle virus (SPFMV). Current understanding of sweet potato responses to SPCSV and SPFMV at the molecular level remains very limited. In this study, we performed deep sequencing of both messenger RNA (mRNA) and small RNA (sRNA) populations in an SPVD-susceptible cultivar ‘Beauregard’ upon viral infection, to identify biological pathways that contribute to both general and specific host responses to these important viral pathogens. We found that pathways related to stress response and signaling were significantly affected by viral infection. sRNA components of these pathways were predominantly affected in late stages of the coinfection by SPCSV and SPFMV. We identified several novel microRNAs that were responsive to viral infection, some of which were predicted to target nucleotide-binding site leucine-rich repeat (NBS-LRR) disease resistance genes. The downregulation of the salicylic acid-mediated defense response pathway in particular seems to be a result of the viral infection process, and can in part explain the susceptible nature of the ‘Beauregard’ cultivar.
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Affiliation(s)
- Ryland Bednarek
- Plant Pathology and Plant-Microbe Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, 14853, USA; Boyce Thompson Institute for Plant Research, Ithaca, NY, 14853, USA
| | - Maria David
- Virology Laboratory, Crop and Systems Science Division, International Potato Center (CIP), Lima 12, Peru
| | - Segundo Fuentes
- Virology Laboratory, Crop and Systems Science Division, International Potato Center (CIP), Lima 12, Peru
| | - Jan Kreuze
- Virology Laboratory, Crop and Systems Science Division, International Potato Center (CIP), Lima 12, Peru.
| | - Zhangjun Fei
- Plant Pathology and Plant-Microbe Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, 14853, USA; Boyce Thompson Institute for Plant Research, Ithaca, NY, 14853, USA; USDA-ARS, Robert W. Holley Center for Agriculture and Health, Ithaca, NY, USA.
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Majumdar R, Galewski PJ, Eujayl I, Minocha R, Vincill E, Strausbaugh CA. Regulatory Roles of Small Non-coding RNAs in Sugar Beet Resistance Against Beet curly top virus. FRONTIERS IN PLANT SCIENCE 2021; 12:780877. [PMID: 35082811 PMCID: PMC8786109 DOI: 10.3389/fpls.2021.780877] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 12/06/2021] [Indexed: 05/05/2023]
Abstract
Beet curly top virus (BCTV) mediated yield loss in sugar beets is a major problem worldwide. The circular single-stranded DNA virus is transmitted by the beet leafhopper. Genetic sources of BCTV resistance in sugar beet are limited and commercial cultivars rely on chemical treatments versus durable genetic resistance. Phenotypic selection and double haploid production have resulted in sugar beet germplasm (KDH13; 13 and KDH4-9; 4) that are highly resistant to BCTV. The molecular mechanism of resistance to the virus is unknown, especially the role of small non-coding RNAs (sncRNAs) during early plant-viral interaction. Using the resistant lines along with a susceptible line (KDH19-17; 19), we demonstrate the role of sugar beet microRNAs (miRNAs) in BCTV resistance during early infection stages when symptoms are not yet visible. The differentially expressed miRNAs altered the expression of their corresponding target genes such as pyruvate dehydrogenase (EL10Ac1g02046), carboxylesterase (EL10Ac1g01087), serine/threonine protein phosphatase (EL10Ac1g01374), and leucine-rich repeats (LRR) receptor-like (EL10Ac7g17778), that were highly expressed in the resistant lines versus susceptible lines. Pathway enrichment analysis of the miRNA target genes showed an enrichment of genes involved in glycolysis/gluconeogenesis, galactose metabolism, starch, and sucrose metabolism to name a few. Carbohydrate analysis revealed altered glucose, galactose, fructose, and sucrose concentrations in the infected leaves of resistant versus susceptible lines. We also demonstrate differential regulation of BCTV derived sncRNAs in the resistant versus susceptible lines that target sugar beet genes such as LRR (EL10Ac1g01206), 7-deoxyloganetic acid glucosyltransferase (EL10Ac5g12605), and transmembrane emp24 domain containing (EL10Ac6g14074) and altered their expression. In response to viral infection, we found that plant derived miRNAs targeted BCTV capsid protein/replication related genes and showed differences in expression among resistant and susceptible lines. The data presented here demonstrate the contribution of miRNA mediated regulation of metabolic pathways and cross-kingdom RNA interference (RNAi) in sugar beet BCTV resistance.
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Affiliation(s)
- Rajtilak Majumdar
- Northwest Irrigation and Soils Research, United States Department of Agriculture-Agricultural Research Service, Kimberly, ID, United States
- *Correspondence: Rajtilak Majumdar,
| | - Paul J. Galewski
- Northwest Irrigation and Soils Research, United States Department of Agriculture-Agricultural Research Service, Kimberly, ID, United States
| | - Imad Eujayl
- Northwest Irrigation and Soils Research, United States Department of Agriculture-Agricultural Research Service, Kimberly, ID, United States
| | - Rakesh Minocha
- Northern Research Station, United States Department of Agriculture Forest Service, Durham, NH, United States
| | - Eric Vincill
- Northwest Irrigation and Soils Research, United States Department of Agriculture-Agricultural Research Service, Kimberly, ID, United States
| | - Carl A. Strausbaugh
- Northwest Irrigation and Soils Research, United States Department of Agriculture-Agricultural Research Service, Kimberly, ID, United States
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22
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Taglienti A, Tiberini A, Ciampa A, Piscopo A, Zappia A, Tomassoli L, Poiana M, Dell'Abate MT. Metabolites response to onion yellow dwarf virus (OYDV) infection in 'Rossa di Tropea' onion during storage: a 1 H HR-MAS NMR study. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2020; 100:3418-3427. [PMID: 32166770 DOI: 10.1002/jsfa.10376] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 01/20/2020] [Accepted: 03/13/2020] [Indexed: 06/10/2023]
Abstract
BACKGROUND Plant viral infections induce changes in metabolic components in the host plant, with potential effects on compositional, organoleptic and storability features of agricultural products. Identification of modulated metabolites may provide clues concerning pathways implementing responses in plant-pathogen interactions. A time course study of metabolic fingerprinting of onion yellow dwarf virus (OYDV)-infected versus healthy 'Rossa di Tropea' onion bulbs was performed using proton high-resolution magic angle spinning nuclear magnetic resonance (1 H HR-MAS NMR) and ultra-performance liquid chromatography (UPLC), providing an overview of the metabolic state of the bulb in response to OYDV infection during storage. RESULTS Metabolites accumulated/depleted upon infection were identified, belonging to flavonoid, saccharide, amino acid and organic acid classes. A decrease in quercetin glucosides content and antioxidant activity was observed in infected bulbs; some amino acids (Arg, Asn, Phe, Val) accumulated, while others were depleted (Leu); for some metabolites, a bimodal time-course was observed during storage (Glc, Lys). Virus interference on metabolic pathways, and the effects of the metabolic shift on edible product storability, organoleptic and nutritional quality were discussed. CONCLUSIONS OYDV infection induces a metabolic shift in 'Rossa di Tropea' onion during bulb storage, involving several pathways and affecting storability and organoleptic and nutritional quality of bulbs at marketable stage. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Anna Taglienti
- Research Centre for Plant Protection and Certification, Council for Agricultural Research and Economics, Rome, Italy
| | - Antonio Tiberini
- Department of Agricultural Science, University 'Mediterraena' of Reggio Calabria, Reggio Calabria, Italy
| | - Alessandra Ciampa
- Research Centre for Agriculture and Environment, Council for Agricultural Research and Economics, Rome, Italy
| | - Amalia Piscopo
- Department of Agricultural Science, University 'Mediterraena' of Reggio Calabria, Reggio Calabria, Italy
| | - Angela Zappia
- Department of Agricultural Science, University 'Mediterraena' of Reggio Calabria, Reggio Calabria, Italy
| | - Laura Tomassoli
- Research Centre for Plant Protection and Certification, Council for Agricultural Research and Economics, Rome, Italy
| | - Marco Poiana
- Department of Agricultural Science, University 'Mediterraena' of Reggio Calabria, Reggio Calabria, Italy
| | - Maria Teresa Dell'Abate
- Research Centre for Agriculture and Environment, Council for Agricultural Research and Economics, Rome, Italy
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23
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Balogh E, Juhász C, Dankó T, Fodor J, Tóbiás I, Gullner G. The expression of several pepper fatty acid desaturase genes is robustly activated in an incompatible pepper-tobamovirus interaction, but only weakly in a compatible interaction. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2020; 148:347-358. [PMID: 32004918 DOI: 10.1016/j.plaphy.2020.01.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 12/18/2019] [Accepted: 01/16/2020] [Indexed: 06/10/2023]
Abstract
The replication of positive strand RNA viruses in plant cells is markedly influenced by the desaturation status of fatty acid chains in lipids of intracellular plant membranes. At present, little is known about the role of lipid desaturation in the replication of tobamoviruses. Therefore, we investigated the expression of fatty acid desaturase (FAD) genes and the fatty acid composition of pepper leaves inoculated with two different tobamoviruses. Obuda pepper virus (ObPV) inoculation induced a hypersensitive reaction (incompatible interaction) while Pepper mild mottle virus (PMMoV) inoculation caused a systemic infection (compatible interaction). Changes in the expression of 16 FADs were monitored in pepper leaves following ObPV and PMMoV inoculations. ObPV inoculation rapidly and markedly upregulated seven Δ12-FADs that encode enzymes putatively located in the endoplasmic reticulum membrane. In contrast, PMMoV inoculation resulted in a weaker but rapid upregulation of two Δ12-FADs and a Δ15-FAD. The expression of genes encoding plastidial FADs was not influenced neither by ObPV nor by PMMoV. In accordance with gene expression results, a significant accumulation of linoleic acid was observed by gas chromatography-mass spectrometry in ObPV-, but not in PMMoV-inoculated leaves. ObPV inoculation led to a marked accumulation of H2O2 in the inoculated leaves. Therefore, the effect of H2O2 treatments on the expression of six tobamovirus-inducible FADs was also studied. The expression of these FADs was upregulated to different degrees by H2O2 that correlated with ObPV-inducibility of these FADs. These results underline the importance of further studies on the role of pepper FADs in pepper-tobamovirus interactions.
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Affiliation(s)
- Eszter Balogh
- Plant Protection Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, 1022, Budapest, Herman Ottó út 15, Hungary
| | - Csilla Juhász
- Plant Protection Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, 1022, Budapest, Herman Ottó út 15, Hungary
| | - Tamás Dankó
- Plant Protection Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, 1022, Budapest, Herman Ottó út 15, Hungary
| | - József Fodor
- Plant Protection Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, 1022, Budapest, Herman Ottó út 15, Hungary
| | - István Tóbiás
- Plant Protection Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, 1022, Budapest, Herman Ottó út 15, Hungary
| | - Gábor Gullner
- Plant Protection Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, 1022, Budapest, Herman Ottó út 15, Hungary.
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Comparative Transcriptome Analysis of Two Cucumber Cultivars with Different Sensitivity to Cucumber Mosaic Virus Infection. Pathogens 2020; 9:pathogens9020145. [PMID: 32098056 PMCID: PMC7168641 DOI: 10.3390/pathogens9020145] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 02/17/2020] [Accepted: 02/19/2020] [Indexed: 12/15/2022] Open
Abstract
Cucumber mosaic virus (CMV), with extremely broad host range including both monocots and dicots around the world, belongs to most important viral crop threats. Either natural or genetically constructed sources of resistance are being intensively investigated; for this purpose, exhaustive knowledge of molecular virus-host interaction during compatible and incompatible infection is required. New technologies and computer-based “omics” on various levels contribute markedly to this topic. In this work, two cucumber cultivars with different response to CMV challenge were tested, i.e., sensitive cv. Vanda and resistant cv. Heliana. The transcriptomes were prepared from both cultivars at 18 days after CMV or mock inoculation. Subsequently, four independent comparative analyses of obtained data were performed, viz. mock- and CMV-inoculated samples within each cultivar, samples from mock-inoculated cultivars to each other and samples from virus-inoculated cultivars to each other. A detailed picture of CMV-influenced genes, as well as constitutive differences in cultivar-specific gene expression was obtained. The compatible CMV infection of cv. Vanda caused downregulation of genes involved in photosynthesis, and induction of genes connected with protein production and modification, as well as components of signaling pathways. CMV challenge caused practically no change in the transcription profile of the cv. Heliana. The main differences between constitutive transcription activity of the two cultivars relied in the expression of genes responsible for methylation, phosphorylation, cell wall organization and carbohydrate metabolism (prevailing in cv. Heliana), or chromosome condensation and glucan biosynthesis (prevailing in cv. Vanda). Involvement of several genes in the resistant cucumber phenotype was predicted; this can be after biological confirmation potentially applied in breeding programs for virus-resistant crops.
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25
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González R, Butković A, Elena SF. From foes to friends: Viral infections expand the limits of host phenotypic plasticity. Adv Virus Res 2020; 106:85-121. [PMID: 32327149 DOI: 10.1016/bs.aivir.2020.01.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Phenotypic plasticity enables organisms to survive in the face of unpredictable environmental stress. Intimately related to the notion of phenotypic plasticity is the concept of the reaction norm that places phenotypic plasticity in the context of a genotype-specific response to environmental gradients. Whether reaction norms themselves evolve and which factors might affect their shape has been the object of intense debates among evolutionary biologists along the years. Since their discovery, viruses have been considered as pathogens. However, new viromic techniques and a shift in conceptual paradigms are showing that viruses are mostly non-pathogenic ubiquitous entities. Recent studies have shown how viral infections can even be beneficial for their hosts. This may happen especially in the context of stressed hosts, where the virus infection can induce beneficial changes in the host's physiological homeostasis, hence changing the shape of the reaction norm. Despite the fact that underlying physiological mechanisms and evolutionary dynamics are still not well understood, such beneficial interactions are being discovered in a growing number of plant-virus systems. Here, we aim to review these disperse studies and place them into the context of phenotypic plasticity and the evolution of reaction norms. This is an emerging field that is posing many questions that still need to be properly answered. The answers would clearly interest virologists, plant pathologists and evolutionary biologists and likely they will suggest possible future biotechnological applications, including the development of crops with higher survival rates and yield under adverse environmental situations.
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Affiliation(s)
- Rubén González
- Instituto de Biología Integrativa de Sistemas, CSIC-Universitat de València, Valencia, Spain.
| | - Anamarija Butković
- Instituto de Biología Integrativa de Sistemas, CSIC-Universitat de València, Valencia, Spain
| | - Santiago F Elena
- Instituto de Biología Integrativa de Sistemas, CSIC-Universitat de València, Valencia, Spain; The Santa Fe Institute, Santa Fe, NM, United States.
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26
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Aguilar E, del Toro FJ, Figueira-Galán D, Hou W, Canto T, Tenllado F. Virus infection induces resistance to Pseudomonas syringae and to drought in both compatible and incompatible bacteria–host interactions, which are compromised under conditions of elevated temperature and CO2 levels. J Gen Virol 2020; 101:122-135. [DOI: 10.1099/jgv.0.001353] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Affiliation(s)
- Emmanuel Aguilar
- Departamento de Biotecnología Microbiana y de Plantas, Centro de Investigaciones Biológicas, CSIC, Madrid 28040, Spain
| | - Francisco J. del Toro
- Departamento de Biotecnología Microbiana y de Plantas, Centro de Investigaciones Biológicas, CSIC, Madrid 28040, Spain
| | - David Figueira-Galán
- Departamento de Biotecnología Microbiana y de Plantas, Centro de Investigaciones Biológicas, CSIC, Madrid 28040, Spain
| | - Weina Hou
- Centre for the Research and Technology of Agro-Environmental and Biological Sciences, Department of Biology, University of Minho, 4710-057, Braga, Portugal
| | - Tomás Canto
- Departamento de Biotecnología Microbiana y de Plantas, Centro de Investigaciones Biológicas, CSIC, Madrid 28040, Spain
| | - Francisco Tenllado
- Departamento de Biotecnología Microbiana y de Plantas, Centro de Investigaciones Biológicas, CSIC, Madrid 28040, Spain
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27
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Guzmán-Benito I, Donaire L, Amorim-Silva V, Vallarino JG, Esteban A, Wierzbicki AT, Ruiz-Ferrer V, Llave C. The immune repressor BIR1 contributes to antiviral defense and undergoes transcriptional and post-transcriptional regulation during viral infections. THE NEW PHYTOLOGIST 2019; 224:421-438. [PMID: 31111491 PMCID: PMC6711825 DOI: 10.1111/nph.15931] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 05/15/2019] [Indexed: 06/09/2023]
Abstract
BIR1 is a receptor-like kinase that functions as a negative regulator of basal immunity and cell death in Arabidopsis. Using Arabidopsis thaliana and Tobacco rattle virus (TRV), we investigate the antiviral role of BIR1, the molecular mechanisms of BIR1 gene expression regulation during viral infections, and the effects of BIR1 overexpression on plant immunity and development. We found that SA acts as a signal molecule for BIR1 activation during infection. Inactivating mutations of BIR1 in the bir1-1 mutant cause strong antiviral resistance independently of constitutive cell death or SA defense priming. BIR1 overexpression leads to severe developmental defects, cell death and premature death, which correlate with the constitutive activation of plant immune responses. Our findings suggest that BIR1 acts as a negative regulator of antiviral defense in plants, and indicate that RNA silencing contributes, alone or in conjunction with other regulatory mechanisms, to define a threshold expression for proper BIR1 function beyond which an autoimmune response may occur. This work provides novel mechanistic insights into the regulation of BIR1 homeostasis that may be common for other plant immune components.
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Affiliation(s)
- Irene Guzmán-Benito
- Departmento de Biotecnología Microbiana y de Plantas, Centro de Investigaciones Biológicas, CSIC, 28040-Madrid, Spain
- Doctorado en Biotecnología y Recursos Genéticos de Plantas y Microorganismos Asociados, ETSI Agronómica, Alimentaria y de Biosistemas, Universidad Politécnica de Madrid, 28040-Madrid, Spain
| | - Livia Donaire
- Departmento de Biotecnología Microbiana y de Plantas, Centro de Investigaciones Biológicas, CSIC, 28040-Madrid, Spain
| | - Vítor Amorim-Silva
- Departamento de Biología Molecular y Bioquímica, Instituto de Hortofruticultura Subtropical y Mediterranea “La Mayora”, Universidad de Málaga-CSIC (IHSM-UMA-CSIC), Universidad de Málaga, Campus Teatinos, 29071-Málaga, Spain
| | - José G. Vallarino
- Departamento de Biología Molecular y Bioquímica, Instituto de Hortofruticultura Subtropical y Mediterranea “La Mayora”, Universidad de Málaga-CSIC (IHSM-UMA-CSIC), Universidad de Málaga, Campus Teatinos, 29071-Málaga, Spain
| | - Alicia Esteban
- Departamento de Biología Molecular y Bioquímica, Instituto de Hortofruticultura Subtropical y Mediterranea “La Mayora”, Universidad de Málaga-CSIC (IHSM-UMA-CSIC), Universidad de Málaga, Campus Teatinos, 29071-Málaga, Spain
| | - Andrzej T. Wierzbicki
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Virginia Ruiz-Ferrer
- Departmento de Biotecnología Microbiana y de Plantas, Centro de Investigaciones Biológicas, CSIC, 28040-Madrid, Spain
| | - César Llave
- Departmento de Biotecnología Microbiana y de Plantas, Centro de Investigaciones Biológicas, CSIC, 28040-Madrid, Spain
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28
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Diezma‐Navas L, Pérez‐González A, Artaza H, Alonso L, Caro E, Llave C, Ruiz‐Ferrer V. Crosstalk between epigenetic silencing and infection by tobacco rattle virus in Arabidopsis. MOLECULAR PLANT PATHOLOGY 2019; 20:1439-1452. [PMID: 31274236 PMCID: PMC6792132 DOI: 10.1111/mpp.12850] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
DNA methylation is an important epigenetic mechanism for controlling innate immunity against microbial pathogens in plants. Little is known, however, about the manner in which viral infections interact with DNA methylation pathways. Here we investigate the crosstalk between epigenetic silencing and viral infections in Arabidopsis inflorescences. We found that tobacco rattle virus (TRV) causes changes in the expression of key transcriptional gene silencing factors with RNA-directed DNA methylation activities that coincide with changes in methylation at the whole genome level. Viral susceptibility/resistance was altered in DNA (de)methylation-deficient mutants, suggesting that DNA methylation is an important regulatory system controlling TRV proliferation. We further show that several transposable elements (TEs) underwent transcriptional activation during TRV infection, and that TE regulation likely involved both DNA methylation-dependent and -independent mechanisms. We identified a cluster of disease resistance genes regulated by DNA methylation in infected plants that were enriched for TEs in their promoters. Interestingly, TEs and nearby resistance genes were co-regulated in TRV-infected DNA (de)methylation mutants. Our study shows that DNA methylation contributes to modulate the outcome of viral infections in Arabidopsis, and opens up new possibilities for exploring the role of TE regulation in antiviral defence.
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Affiliation(s)
- Laura Diezma‐Navas
- Department of Microbial and Plant Biotechnology, Centro de Investigaciones BiológicasCSICRamiro de Maeztu 9MadridSpain
- Doctorado en Biotecnología y Recursos Genéticos de Plantas y Microorganismos AsociadosETSI Agronómica, Alimentaria y de Biosistemas, Universidad Politécnica de Madrid28040MadridSpain
| | - Ana Pérez‐González
- Centro de Biotecnología y Genómica de PlantasUniversidad Politécnica de Madrid (UPM)Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA)Campus de Montegancedo UPM28223Pozuelo de Alarcón, MadridSpain
| | - Haydeé Artaza
- Bionformatic and Statistic Service, Centro de Investigaciones BiológicasCSICRamiro de Maeztu 928040MadridSpain
- Present address:
Department of Clinical ScienceUniversity of Bergen5020BergenNorway
| | - Lola Alonso
- Bionformatic and Statistic Service, Centro de Investigaciones BiológicasCSICRamiro de Maeztu 928040MadridSpain
- Present address:
Genetic and Molecular Epidemiology Group, Spanish National Cancer Research Center (CNIO)MadridSpain
| | - Elena Caro
- Centro de Biotecnología y Genómica de PlantasUniversidad Politécnica de Madrid (UPM)Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA)Campus de Montegancedo UPM28223Pozuelo de Alarcón, MadridSpain
| | - César Llave
- Department of Microbial and Plant Biotechnology, Centro de Investigaciones BiológicasCSICRamiro de Maeztu 9MadridSpain
| | - Virginia Ruiz‐Ferrer
- Department of Microbial and Plant Biotechnology, Centro de Investigaciones BiológicasCSICRamiro de Maeztu 9MadridSpain
- Present address:
Department of Plant Physiology, Plant Biotechnology and Molecular Biology Group. Environmental Sciences and Biochemistry SchoolCastilla‐La Mancha UniversityToledoSpain
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29
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Govindjee. A sixty-year tryst with photosynthesis and related processes: an informal personal perspective. PHOTOSYNTHESIS RESEARCH 2019; 139:15-43. [PMID: 30343396 DOI: 10.1007/s11120-018-0590-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Accepted: 10/01/2018] [Indexed: 06/08/2023]
Abstract
After briefly describing my early collaborative work at the University of Allahabad, that had laid the foundation of my research life, I present here some of our research on photosynthesis at the University of Illinois at Urbana-Champaign, randomly selected from light absorption to NADP+ reduction in plants, algae, and cyanobacteria. These include the fact that (i) both the light reactions I and II are powered by light absorbed by chlorophyll (Chl) a of different spectral forms; (ii) light emission (fluorescence, delayed fluorescence, and thermoluminescence) by plants, algae, and cyanobacteria provides detailed information on these reactions and beyond; (iii) primary photochemistry in both the photosystems I (PS I) and II (PS II) occurs within a few picoseconds; and (iv) most importantly, bicarbonate plays a unique role on the electron acceptor side of PS II, specifically at the two-electron gate of PS II. Currently, the ongoing research around the world is, and should be, directed towards making photosynthesis better able to deal with the global issues (such as increasing population, dwindling resources, and rising temperature) particularly through genetic modification. However, basic research is necessary to continue to provide us with an understanding of the molecular mechanism of the process and to guide us in reaching our goals of increasing food production and other chemicals we need for our lives.
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Rubio B, Cosson P, Caballero M, Revers F, Bergelson J, Roux F, Schurdi-Levraud V. Genome-wide association study reveals new loci involved in Arabidopsis thaliana and Turnip mosaic virus (TuMV) interactions in the field. THE NEW PHYTOLOGIST 2019; 221:2026-2038. [PMID: 30282123 DOI: 10.1111/nph.15507] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Accepted: 09/18/2018] [Indexed: 05/12/2023]
Abstract
The genetic architecture of plant response to viruses has often been studied in model nonnatural pathosystems under controlled conditions. There is an urgent need to elucidate the genetic architecture of the response to viruses in a natural setting. A field experiment was performed in each of two years. In total, 317 Arabidopsis thaliana accessions were inoculated with its natural Turnip mosaic virus (TuMV). The accessions were phenotyped for viral accumulation, frequency of infected plants, stem length and symptoms. Genome-wide association mapping was performed. Arabidopsis thaliana exhibits extensive natural variation in its response to TuMV in the field. The underlying genetic architecture reveals a more quantitative picture than in controlled conditions. Ten genomic regions were consistently identified across the two years. RTM3 (Restricted TEV Movement 3) is a major candidate for the response to TuMV in the field. New candidate genes include Dead box helicase 1, a Tim Barrel domain protein and the eukaryotic translation initiation factor eIF3b. To our knowledge, this study is the first to report the genetic architecture of quantitative response of A. thaliana to a naturally occurring virus in a field environment, thereby highlighting relevant candidate genes involved in plant virus interactions in nature.
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Affiliation(s)
- Bernadette Rubio
- Univ. Bordeaux INRA, UMR Biologie du Fruit et Pathologie, 1332, 71 avenue Edouard Bourlaux, 33883, Villenave d'Ornon cedex, France
| | - Patrick Cosson
- Univ. Bordeaux INRA, UMR Biologie du Fruit et Pathologie, 1332, 71 avenue Edouard Bourlaux, 33883, Villenave d'Ornon cedex, France
| | - Mélodie Caballero
- Univ. Bordeaux INRA, UMR Biologie du Fruit et Pathologie, 1332, 71 avenue Edouard Bourlaux, 33883, Villenave d'Ornon cedex, France
| | - Frédéric Revers
- INRA, UMR 1202 BIOGECO, Université de Bordeaux, 69 Route d'Arcachon, 33612, Cestas Cedex, France
| | - Joy Bergelson
- Ecology & Evolution, University of Chicago, 1101 E 57th St, Chicago, IL, 60637, USA
| | - Fabrice Roux
- LIPM, INRA, CNRS, Université de Toulouse, Castanet-Tolosan, France
| | - Valérie Schurdi-Levraud
- Univ. Bordeaux INRA, UMR Biologie du Fruit et Pathologie, 1332, 71 avenue Edouard Bourlaux, 33883, Villenave d'Ornon cedex, France
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31
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Wrzesińska B, Dai Vu L, Gevaert K, De Smet I, Obrępalska-Stęplowska A. Peanut Stunt Virus and Its Satellite RNA Trigger Changes in Phosphorylation in N. benthamiana Infected Plants at the Early Stage of the Infection. Int J Mol Sci 2018; 19:E3223. [PMID: 30340407 PMCID: PMC6214028 DOI: 10.3390/ijms19103223] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 10/11/2018] [Accepted: 10/16/2018] [Indexed: 11/16/2022] Open
Abstract
Signaling in host plants is an integral part of a successful infection by pathogenic RNA viruses. Therefore, identifying early signaling events in host plants that play an important role in establishing the infection process will help our understanding of the disease process. In this context, phosphorylation constitutes one of the most important post-translational protein modifications, regulating many cellular signaling processes. In this study, we aimed to identify the processes affected by infection with Peanut stunt virus (PSV) and its satellite RNA (satRNA) in Nicotiana benthamiana at the early stage of pathogenesis. To achieve this, we performed proteome and phosphoproteome analyses on plants treated with PSV and its satRNA. The analysis of the number of differentially phosphorylated proteins showed strong down-regulation in phosphorylation in virus-treated plants (without satRNA). Moreover, proteome analysis revealed more down-regulated proteins in PSV and satRNA-treated plants, which indicated a complex dependence between proteins and their modifications. Apart from changes in photosynthesis and carbon metabolism, which are usually observed in virus-infected plants, alterations in proteins involved in RNA synthesis, transport, and turnover were observed. As a whole, this is the first community (phospho)proteome resource upon infection of N. benthamiana with a cucumovirus and its satRNA and this resource constitutes a valuable data set for future studies.
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Affiliation(s)
- Barbara Wrzesińska
- Institute of Plant Protection-National Research Institute, Department of Entomology, Animal Pests and Biotechnology, Władysława Węgorka 20, 60-318 Poznań, Poland.
| | - Lam Dai Vu
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 927, 9052 Ghent, Belgium.
- VIB Center for Plant Systems Biology, Technologiepark 927, 9052 Ghent, Belgium.
- Department of Biomolecular Medicine, Ghent University, B-9000 Ghent, Belgium.
- VIB Center for Medical Biotechnology, B-9000 Ghent, Belgium.
| | - Kris Gevaert
- Department of Biomolecular Medicine, Ghent University, B-9000 Ghent, Belgium.
- VIB Center for Medical Biotechnology, B-9000 Ghent, Belgium.
| | - Ive De Smet
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 927, 9052 Ghent, Belgium.
- VIB Center for Plant Systems Biology, Technologiepark 927, 9052 Ghent, Belgium.
| | - Aleksandra Obrępalska-Stęplowska
- Institute of Plant Protection-National Research Institute, Department of Entomology, Animal Pests and Biotechnology, Władysława Węgorka 20, 60-318 Poznań, Poland.
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Yue R, Lu C, Han X, Guo S, Yan S, Liu L, Fu X, Chen N, Guo X, Chi H, Tie S. Comparative proteomic analysis of maize (Zea mays L.) seedlings under rice black-streaked dwarf virus infection. BMC PLANT BIOLOGY 2018; 18:191. [PMID: 30208842 PMCID: PMC6136180 DOI: 10.1186/s12870-018-1419-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Accepted: 09/06/2018] [Indexed: 05/03/2023]
Abstract
BACKGROUND Maize rough dwarf disease (MRDD) is a severe disease that has been occurring frequently in southern China and many other Asian countries. MRDD is caused by the infection of Rice black streaked dwarf virus (RBSDV) and leads to significant economic losses in maize production. To well understand the destructive effects of RBSDV infection on maize growth, comparative proteomic analyses of maize seedlings under RBSDV infection was performed using an integrated approach involving LC-MS/MS and Tandem Mass Tag (TMT) labeling. RESULTS In total, 7615 maize proteins, 6319 of which were quantified. A total of 116 differentially accumulated proteins (DAPs) were identified, including 35 up- and 81 down-regulated proteins under the RBSDV infection. Enrichment analysis showed that the DAPs were most strongly associated with cyanoamino acid metabolism, protein processing in ER, and ribosome-related pathways. Two sulfur metabolism-related proteins were significantly reduced, indicating that sulfur may participate in the resistance against RBSDV infection. Furthermore, 15 DAPs involved in six metabolic pathways were identified in maize under the RBSDV infection. CONCLUSIONS Our data revealed that the responses of maize to RBSDV infection were controlled by various metabolic pathways.
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Affiliation(s)
- Runqing Yue
- Henan Academy of Agricultural Sciences, Zhengzhou, China
- The Henan Provincial Key Laboratory of Maize Biology, Zhengzhou, China
| | - Caixia Lu
- Henan Academy of Agricultural Sciences, Zhengzhou, China
- The Henan Provincial Key Laboratory of Maize Biology, Zhengzhou, China
| | - Xiaohua Han
- Henan Academy of Agricultural Sciences, Zhengzhou, China
- The Henan Provincial Key Laboratory of Maize Biology, Zhengzhou, China
| | - Shulei Guo
- Henan Academy of Agricultural Sciences, Zhengzhou, China
- The Henan Provincial Key Laboratory of Maize Biology, Zhengzhou, China
| | - Shufeng Yan
- Henan Academy of Agricultural Sciences, Zhengzhou, China
- The Henan Provincial Key Laboratory of Maize Biology, Zhengzhou, China
| | - Lu Liu
- Henan Academy of Agricultural Sciences, Zhengzhou, China
- The Henan Provincial Key Laboratory of Maize Biology, Zhengzhou, China
| | - Xiaolei Fu
- Henan Academy of Agricultural Sciences, Zhengzhou, China
- The Henan Provincial Key Laboratory of Maize Biology, Zhengzhou, China
| | - Nana Chen
- Henan Academy of Agricultural Sciences, Zhengzhou, China
- The Henan Provincial Key Laboratory of Maize Biology, Zhengzhou, China
| | - Xinhai Guo
- Henan Academy of Agricultural Sciences, Zhengzhou, China
- The Henan Provincial Key Laboratory of Maize Biology, Zhengzhou, China
| | - Haifeng Chi
- Henan Academy of Agricultural Sciences, Zhengzhou, China
- The Henan Provincial Key Laboratory of Maize Biology, Zhengzhou, China
| | - Shuanggui Tie
- Henan Academy of Agricultural Sciences, Zhengzhou, China
- The Henan Provincial Key Laboratory of Maize Biology, Zhengzhou, China
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Aguilar E, Cutrona C, Del Toro FJ, Vallarino JG, Osorio S, Pérez-Bueno ML, Barón M, Chung BN, Canto T, Tenllado F. Virulence determines beneficial trade-offs in the response of virus-infected plants to drought via induction of salicylic acid. PLANT, CELL & ENVIRONMENT 2017; 40:2909-2930. [PMID: 28718885 DOI: 10.1111/pce.13028] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 06/28/2017] [Accepted: 07/02/2017] [Indexed: 05/21/2023]
Abstract
It has been hypothesized that plants can get beneficial trade-offs from viral infections when grown under drought conditions. However, experimental support for a positive correlation between virus-induced drought tolerance and increased host fitness is scarce. We investigated whether increased virulence exhibited by the synergistic interaction involving Potato virus X (PVX) and Plum pox virus (PPV) improves tolerance to drought and host fitness in Nicotiana benthamiana and Arabidopsis thaliana. Infection by the pair PPV/PVX and by PPV expressing the virulence protein P25 of PVX conferred an enhanced drought-tolerant phenotype compared with single infections with either PPV or PVX. Decreased transpiration rates in virus-infected plants were correlated with drought tolerance in N. benthamiana but not in Arabidopsis. Metabolite and hormonal profiles of Arabidopsis plants infected with the different viruses showed a range of changes that positively correlated with a greater impact on drought tolerance. Virus infection enhanced drought tolerance in both species by increasing salicylic acid accumulation in an abscisic acid-independent manner. Viable offspring derived from Arabidopsis plants infected with PPV increased relative to non-infected plants, when exposed to drought. By contrast, the detrimental effect caused by the more virulent viruses overcame potential benefits associated with increased drought tolerance on host fitness.
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Affiliation(s)
- Emmanuel Aguilar
- Departamento de Biología Medioambiental, Centro de Investigaciones Biológicas, CSIC, Madrid, 28040, Spain
| | - Carmen Cutrona
- Departamento de Biología Medioambiental, Centro de Investigaciones Biológicas, CSIC, Madrid, 28040, Spain
| | - Francisco J Del Toro
- Departamento de Biología Medioambiental, Centro de Investigaciones Biológicas, CSIC, Madrid, 28040, Spain
| | - José G Vallarino
- Departamento de Biología Molecular y Bioquímica, Instituto de Hortofruticultura Subtropical y Mediterránea, Universidad de Málaga-CSIC, Málaga, 2907, Spain
| | - Sonia Osorio
- Departamento de Biología Molecular y Bioquímica, Instituto de Hortofruticultura Subtropical y Mediterránea, Universidad de Málaga-CSIC, Málaga, 2907, Spain
| | - María Luisa Pérez-Bueno
- Departamento de Bioquímica, Biología Celular y Molecular de Plantas, Estación Experimental del Zaidín, CSIC, Granada, 18008, Spain
| | - Matilde Barón
- Departamento de Bioquímica, Biología Celular y Molecular de Plantas, Estación Experimental del Zaidín, CSIC, Granada, 18008, Spain
| | - Bong-Nam Chung
- National Institute of Horticultural and Herbal Science, Rural Development Administration, Wanju, 55365, Republic of Korea
| | - Tomás Canto
- Departamento de Biología Medioambiental, Centro de Investigaciones Biológicas, CSIC, Madrid, 28040, Spain
| | - Francisco Tenllado
- Departamento de Biología Medioambiental, Centro de Investigaciones Biológicas, CSIC, Madrid, 28040, Spain
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Jupin I, Ayach M, Jomat L, Fieulaine S, Bressanelli S. A mobile loop near the active site acts as a switch between the dual activities of a viral protease/deubiquitinase. PLoS Pathog 2017; 13:e1006714. [PMID: 29117247 PMCID: PMC5695851 DOI: 10.1371/journal.ppat.1006714] [Citation(s) in RCA: 14] [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: 01/18/2017] [Revised: 11/20/2017] [Accepted: 10/25/2017] [Indexed: 12/21/2022] Open
Abstract
The positive-strand RNA virus Turnip yellow mosaic virus (TYMV) encodes an ovarian tumor (OTU)-like protease/deubiquitinase (PRO/DUB) protein domain involved both in proteolytic processing of the viral polyprotein through its PRO activity, and in removal of ubiquitin chains from ubiquitylated substrates through its DUB activity. Here, the crystal structures of TYMV PRO/DUB mutants and molecular dynamics simulations reveal that an idiosyncratic mobile loop participates in reversibly constricting its unusual catalytic site by adopting "open", "intermediate" or "closed" conformations. The two cis-prolines of the loop form a rigid flap that in the most closed conformation zips up against the other side of the catalytic cleft. The intermediate and closed conformations also correlate with a reordering of the TYMV PRO/DUB catalytic dyad, that then assumes a classical, yet still unusually mobile, OTU DUB alignment. Further structure-based mutants designed to interfere with the loop's mobility were assessed for enzymatic activity in vitro and in vivo, and were shown to display reduced DUB activity while retaining PRO activity. This indicates that control of the switching between the dual PRO/DUB activities resides prominently within this loop next to the active site. Introduction of mutations into the viral genome revealed that the DUB activity contributes to the extent of viral RNA accumulation both in single cells and in whole plants. In addition, the conformation of the mobile flap was also found to influence symptoms severity in planta. Such mutants now provide powerful tools with which to study the specific roles of reversible ubiquitylation in viral infection. Viruses have much smaller genomes than their hosts. Consequently, they often encode proteins which are multifunctional. For instance, some viral proteases have a dual function, being also deubiquitinases, i.e. enzymes capable of removing ubiquitin tags grafted onto proteins and that often target them for destruction. The protease and deubiquitinase activities share a single active site that is used alternately for one function or the other, but how this switch between activities may be regulated is presently unknown. To answer this question, we studied a simple plant virus that is a useful model system for these complex molecular biology phenomena, and that encodes a simplified protease/deubiquitinase. Here, thanks to a combination of structural and functional analyses, we managed to decouple the two activities, killing the deubiquitinase activity while preserving the protease one. This successful decoupling relies on our discovery that a loop inserted next to the active site is mobile, and can thus act as a switch between the two activities. This result allowed us to demonstrate the importance of the specific deubiquinase activity in viral multiplication. In addition, viral symptoms were also severely affected by mutations affecting the loop mobility. Our data provide powerful tools for further studies, that may also be relevant for more complex or medically relevant viruses.
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Affiliation(s)
- Isabelle Jupin
- Institut Jacques Monod, CNRS—Univ Paris-Diderot, Paris, France
- * E-mail: (IJ); (SB)
| | - Maya Ayach
- Institute for Integrative Biology of the Cell, CEA—CNRS—Univ Paris-Saclay, Gif sur Yvette, France
| | - Lucile Jomat
- Institut Jacques Monod, CNRS—Univ Paris-Diderot, Paris, France
| | - Sonia Fieulaine
- Institute for Integrative Biology of the Cell, CEA—CNRS—Univ Paris-Saclay, Gif sur Yvette, France
| | - Stéphane Bressanelli
- Institute for Integrative Biology of the Cell, CEA—CNRS—Univ Paris-Saclay, Gif sur Yvette, France
- * E-mail: (IJ); (SB)
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Nicaise V, Candresse T. Plum pox virus capsid protein suppresses plant pathogen-associated molecular pattern (PAMP)-triggered immunity. MOLECULAR PLANT PATHOLOGY 2017; 18:878-886. [PMID: 27301551 PMCID: PMC6638313 DOI: 10.1111/mpp.12447] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 06/01/2016] [Accepted: 06/10/2016] [Indexed: 05/20/2023]
Abstract
The perception of pathogen-associated molecular patterns (PAMPs) by immune receptors launches defence mechanisms referred to as PAMP-triggered immunity (PTI). Successful pathogens must suppress PTI pathways via the action of effectors to efficiently colonize their hosts. So far, plant PTI has been reported to be active against most classes of pathogens, except viruses, although this defence layer has been hypothesized recently as an active part of antiviral immunity which needs to be suppressed by viruses for infection success. Here, we report that Arabidopsis PTI genes are regulated upon infection by viruses and contribute to plant resistance to Plum pox virus (PPV). Our experiments further show that PPV suppresses two early PTI responses, the oxidative burst and marker gene expression, during Arabidopsis infection. In planta expression of PPV capsid protein (CP) was found to strongly impair these responses in Nicotiana benthamiana and Arabidopsis, revealing its PTI suppressor activity. In summary, we provide the first clear evidence that plant viruses acquired the ability to suppress PTI mechanisms via the action of effectors, highlighting a novel strategy employed by viruses to escape plant defences.
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Affiliation(s)
- Valerie Nicaise
- INRA, UMR 1332 BFP, CS 20032Villenave d'Ornon cedex33882France
- University of Bordeaux, UMR 1332 BFP, CS 20032Villenave d'Ornon cedex33882France
| | - Thierry Candresse
- INRA, UMR 1332 BFP, CS 20032Villenave d'Ornon cedex33882France
- University of Bordeaux, UMR 1332 BFP, CS 20032Villenave d'Ornon cedex33882France
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36
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Sahi G, Hedley PE, Morris J, Loake GJ, MacFarlane SA. Molecular and Biochemical Examination of Spraing Disease in Potato Tuber in Response to Tobacco rattle virus Infection. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2016; 29:822-828. [PMID: 27681277 DOI: 10.1094/mpmi-08-16-0169-r] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Field-grown tubers of potato were examined for infection by Tobacco rattle virus (TRV) and consequent production of corky ringspot or spraing symptoms. A microarray study identified genes that are differentially expressed in tuber tissue in response to TRV infection and to spraing production, suggesting that hypersensitive response (HR) pathways are activated in spraing-symptomatic tubers. This was confirmed by quantitative reverse transcription-polymerase chain reaction (qRT-PCR) of a selected group of HR-related genes and by histochemical staining of excised tuber tissue with spraing symptoms. qRT-PCR of TRV in different regions of the same tuber slice showed that nonsymptomatic areas contained higher levels of virus relative to spraing-symptomatic areas. This suggests that spraing formation is associated with an active plant defense that reduces the level of virus in the infected tuber. Expression of two of the same plant defense genes was similarly upregulated in tubers that were infected with Potato mop-top virus, a virus that also induces spraing formation.
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Affiliation(s)
- Ghulam Sahi
- 1 The James Hutton Institute, Invergowrie, Dundee DD2 5DA, U.K
| | - Pete E Hedley
- 1 The James Hutton Institute, Invergowrie, Dundee DD2 5DA, U.K
| | - Jenny Morris
- 1 The James Hutton Institute, Invergowrie, Dundee DD2 5DA, U.K
| | - Gary J Loake
- 2 Institute of Molecular Plant Sciences, School of Biological Sciences, Kings Buildings, Mayfield Road, Edinburgh EH9 3JH, U.K
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37
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Dynamic cross-talk between host primary metabolism and viruses during infections in plants. Curr Opin Virol 2016; 19:50-5. [PMID: 27442236 DOI: 10.1016/j.coviro.2016.06.013] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 06/21/2016] [Accepted: 06/29/2016] [Indexed: 12/23/2022]
Abstract
Upon infection plant viruses modulate cellular functions and resources to survive and reproduce. Plant cells in which the virus is replicating are transformed into strong metabolic sinks. This conversion gives rise to a massive reprogramming of plant primary metabolism. Such a metabolic shift involves perturbations in carbohydrates, amino acids and lipids that eventually lead to increase respiration rates, and/or decrease in photosynthetic activity. By doing so, plants provide metabolic acclimation against cellular stress and meet the increased demand for energy needed to sustain virus multiplication and defense responses against viruses. This review will highlight our current knowledge pertaining to the contribution of primary metabolism to the outcome of viral infections in plants.
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38
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Pu XJ, Li YN, Wei LJ, Xi DH, Lin HH. Mitochondrial energy-dissipation pathway and cellular redox disruption compromises Arabidopsis resistance to turnip crinkle virus infection. Biochem Biophys Res Commun 2016; 473:421-7. [DOI: 10.1016/j.bbrc.2016.03.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Accepted: 03/07/2016] [Indexed: 02/06/2023]
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39
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Shi B, Lin L, Wang S, Guo Q, Zhou H, Rong L, Li J, Peng J, Lu Y, Zheng H, Yang Y, Chen Z, Zhao J, Jiang T, Song B, Chen J, Yan F. Identification and regulation of host genes related to Rice stripe virus symptom production. THE NEW PHYTOLOGIST 2016; 209:1106-19. [PMID: 26487490 DOI: 10.1111/nph.13699] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Accepted: 08/28/2015] [Indexed: 05/11/2023]
Abstract
Viral infections cause plant chlorosis, stunting, necrosis or other symptoms. The down-regulation of chloroplast-related genes (ChRGs) is assumed to be responsible for chlorosis. We identified the differentially expressed genes (DEGs) in Rice stripe virus (RSV)-infected Nicotiana benthamiana, and examined the contribution of 75 down-regulated DEGs to RSV symptoms by silencing them one by one using Tobacco rattle virus (TRV)-induced gene silencing. Silencing of 11 of the 75 down-regulated DEGs caused plant chlorosis, and nine of the 11 were ChRGs. Silencing of a down-regulated DEG encoding the eukaryotic translation initiation factor 4A (eIF4A) caused leaf-twisting and stunting that were visible on RSV-infected N. benthamiana. A region of RSV RNA4 was complementary to part of eIF4A mRNA and virus-derived small interfering (vsiRNAs) from that region were present in infected N. benthamiana. When expressed as artificial microRNAs, those vsiRNAs could target NbeIF4A mRNA for regulation. We provide experimental evidence supporting the association of ChRGs with chlorosis and show that eIF4A is involved in RSV symptom development. This is also the first report demonstrating that siRNA derived directly from a plant virus can target a host gene for regulation.
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Affiliation(s)
- Bingbin Shi
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036, China
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Lin Lin
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Shihui Wang
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Qin Guo
- Center for Research and Development of Fine Chemicals, Guizhou University, Guiyang, 550025, China
| | - Hong Zhou
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036, China
| | - Lingling Rong
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Junmin Li
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Jiejun Peng
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Yuwen Lu
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Hongying Zheng
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Yong Yang
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Zhuo Chen
- Center for Research and Development of Fine Chemicals, Guizhou University, Guiyang, 550025, China
| | - Jinping Zhao
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Tong Jiang
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036, China
| | - Baoan Song
- Center for Research and Development of Fine Chemicals, Guizhou University, Guiyang, 550025, China
| | - Jianping Chen
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
| | - Fei Yan
- The State Key Laboratory Breeding Base for Sustainable Control of Pest and Disease, Key Laboratory of Biotechnology in Plant Protection of MOA of China and Zhejiang Province, Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, China
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40
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Primary Metabolism, Phenylpropanoids and Antioxidant Pathways Are Regulated in Potato as a Response to Potato virus Y Infection. PLoS One 2016; 11:e0146135. [PMID: 26727123 PMCID: PMC4738437 DOI: 10.1371/journal.pone.0146135] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Accepted: 12/14/2015] [Indexed: 11/19/2022] Open
Abstract
Potato production is one of the most important agricultural sectors, and it is challenged by various detrimental factors, including virus infections. To control losses in potato production, knowledge about the virus—plant interactions is crucial. Here, we investigated the molecular processes in potato plants as a result of Potato virus Y (PVY) infection, the most economically important potato viral pathogen. We performed an integrative study that links changes in the metabolome and gene expression in potato leaves inoculated with the mild PVYN and aggressive PVYNTN isolates, for different times through disease development. At the beginning of infection (1 day post-inoculation), virus-infected plants showed an initial decrease in the concentrations of metabolites connected to sugar and amino-acid metabolism, the TCA cycle, the GABA shunt, ROS scavangers, and phenylpropanoids, relative to the control plants. A pronounced increase in those metabolites was detected at the start of the strong viral multiplication in infected leaves. The alterations in these metabolic pathways were also seen at the gene expression level, as analysed by quantitative PCR. In addition, the systemic response in the metabolome to PVY infection was analysed. Systemic leaves showed a less-pronounced response with fewer metabolites altered, while phenylpropanoid-associated metabolites were strongly accumulated. There was a more rapid onset of accumulation of ROS scavengers in leaves inoculated with PVYN than those inoculated with PVYNTN. This appears to be related to the lower damage observed for leaves of potato infected with the milder PVYN strain, and at least partially explains the differences between the phenotypes observed.
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41
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Fernández-Calvino L, Martínez-Priego L, Szabo EZ, Guzmán-Benito I, González I, Canto T, Lakatos L, Llave C. Tobacco rattle virus 16K silencing suppressor binds ARGONAUTE 4 and inhibits formation of RNA silencing complexes. J Gen Virol 2016; 97:246-257. [PMID: 26498945 DOI: 10.1099/jgv.0.000323] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The cysteine-rich 16K protein of tobacco rattle virus (TRV), the type member of the genus Tobravirus, is known to suppress RNA silencing. However, the mechanism of action of the 16K suppressor is not well understood. In this study, we used a GFP-based sensor strategy and an Agrobacterium-mediated transient assay in Nicotiana benthamiana to show that 16K was unable to inhibit the activity of existing small interfering RNA (siRNA)- and microRNA (miRNA)-programmed RNA-induced silencing effector complexes (RISCs). In contrast, 16K efficiently interfered with de novo formation of miRNA- and siRNA-guided RISCs, thus preventing cleavage of target RNA. Interestingly, we found that transiently expressed endogenous miR399 and miR172 directed sequence-specific silencing of complementary sequences of viral origin. 16K failed to bind small RNAs, although it interacted with ARGONAUTE 4, as revealed by bimolecular fluorescence complementation and immunoprecipitation assays. Site-directed mutagenesis demonstrated that highly conserved cysteine residues within the N-terminal and central regions of the 16K protein are required for protein stability and/or RNA silencing suppression.
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Affiliation(s)
- Lourdes Fernández-Calvino
- Department of Environmental Biology, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Ramiro de Maeztu 9, 28040 Madrid, Spain
| | - Llúcia Martínez-Priego
- Department of Environmental Biology, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Ramiro de Maeztu 9, 28040 Madrid, Spain
| | - Edit Z Szabo
- Department of Dermatology and Allergology, University of Szeged, H-6720 Szeged, Koranyi str. 6, Hungary
| | - Irene Guzmán-Benito
- Department of Environmental Biology, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Ramiro de Maeztu 9, 28040 Madrid, Spain
| | - Inmaculada González
- Department of Environmental Biology, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Ramiro de Maeztu 9, 28040 Madrid, Spain
| | - Tomás Canto
- Department of Environmental Biology, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Ramiro de Maeztu 9, 28040 Madrid, Spain
| | - Lóránt Lakatos
- Department of Dermatology and Allergology, University of Szeged, H-6720 Szeged, Koranyi str. 6, Hungary
- MTA-SZTE Dermatological Research Group, Hungary
| | - César Llave
- Department of Environmental Biology, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Ramiro de Maeztu 9, 28040 Madrid, Spain
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42
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Fernández-Calvino L, Guzmán-Benito I, Del Toro FJ, Donaire L, Castro-Sanz AB, Ruíz-Ferrer V, Llave C. Activation of senescence-associated Dark-inducible (DIN) genes during infection contributes to enhanced susceptibility to plant viruses. MOLECULAR PLANT PATHOLOGY 2016; 17:3-15. [PMID: 25787925 PMCID: PMC6638341 DOI: 10.1111/mpp.12257] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Virus infections in plants cause changes in host gene expression that are common to other environmental stresses. In this work, we found extensive overlap in the transcriptional responses between Arabidopsis thaliana plants infected with Tobacco rattle virus (TRV) and plants undergoing senescence. This is exemplified by the up-regulation during infection of several senescence-associated Dark-inducible (DIN) genes, including AtDIN1 (Senescence 1, SEN1), AtDIN6 (Asparagine synthetase 1, AtASN1) and AtDIN11. DIN1, DIN6 and DIN11 homologues were also activated in Nicotiana benthamiana in response to TRV and Potato virus X (PVX) infection. Reduced TRV levels in RNA interference (RNAi) lines targeting AtDIN11 indicate that DIN11 is an important modulator of susceptibility to TRV in Arabidopsis. Furthermore, low accumulation of TRV in Arabidopsis protoplasts from RNAi lines suggests that AtDIN11 supports virus multiplication in this species. The effect of DIN6 on virus accumulation was negligible in Arabidopsis, perhaps as a result of gene or functional redundancy. However, TRV-induced silencing of NbASN, the DIN6 homologue in N. benthamiana, compromises TRV and PVX accumulation in systemically infected leaves. Interestingly, NbASN inactivation correlates with the appearance of morphological defects in infected leaves. We found that DIN6 and DIN11 regulate virus multiplication in a step prior to the activation of plant defence responses. We hypothesize on the possible roles of DIN6 and DIN11 during virus infection.
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Affiliation(s)
- Lourdes Fernández-Calvino
- Department of Environmental Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Irene Guzmán-Benito
- Department of Environmental Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Francisco J Del Toro
- Department of Environmental Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Livia Donaire
- Department of Environmental Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Ana B Castro-Sanz
- Department of Environmental Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Virginia Ruíz-Ferrer
- Department of Environmental Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - César Llave
- Department of Environmental Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
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