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Arinaitwe W, Tungadi TD, Pate AE, Joyce J, Baek E, Murphy AM, Carr JP. Induction of aphid resistance in tobacco by the cucumber mosaic virus CMV∆2b mutant is jasmonate-dependent. MOLECULAR PLANT PATHOLOGY 2023; 24:391-395. [PMID: 36775660 PMCID: PMC10013749 DOI: 10.1111/mpp.13305] [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: 11/13/2022] [Revised: 12/22/2022] [Accepted: 01/21/2023] [Indexed: 06/18/2023]
Abstract
Cucumber mosaic virus (CMV) is vectored by aphids, including Myzus persicae. Tobacco (Nicotiana tabacum 'Xanthi') plants infected with a mutant of the Fny strain of CMV (Fny-CMVΔ2b, which cannot express the CMV 2b protein) exhibit strong resistance against M. persicae, which is manifested by decreased survival and reproduction of aphids confined on the plants. Previously, we found that the Fny-CMV 1a replication protein elicits aphid resistance in plants infected with Fny-CMVΔ2b, whereas in plants infected with wild-type Fny-CMV this is counteracted by the CMV 2b protein, a counterdefence protein that, among other things, inhibits jasmonic acid (JA)-dependent immune signalling. We noted that in nontransformed cv. Petit Havana SR1 tobacco plants aphid resistance was not induced by Fny-CMVΔ2b, suggesting that not all tobacco varieties possess the factor(s) with which the 1a protein interacts. To determine if 1a protein-induced aphid resistance is JA-dependent in Xanthi tobacco, transgenic plants were made that expressed an RNA silencing construct to diminish expression of the JA co-receptor CORONATINE-INSENSITIVE 1. Fny-CMVΔ2b did not induce resistance to M. persicae in these transgenic plants. Thus, aphid resistance induction by the 1a protein requires JA-dependent defensive signalling, which is countered by the CMV 2b protein.
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Affiliation(s)
- Warren Arinaitwe
- Department of Plant SciencesUniversity of CambridgeCambridgeUK
- Present address:
Alliance of Bioversity International and International Center for Tropical AgricultureDong Dok, Ban Nongviengkham, VientianeLao People's Democratic Republic
| | - Trisna D. Tungadi
- Department of Plant SciencesUniversity of CambridgeCambridgeUK
- Present address:
School of Life Sciences, Keele UniversityNewcastleUK
| | | | - Joshua Joyce
- Department of Plant SciencesUniversity of CambridgeCambridgeUK
- Present address:
John Innes CentreNorwichUK
| | - Eseul Baek
- Department of Plant SciencesUniversity of CambridgeCambridgeUK
- Present address:
Department of Horticultural SciencesSeoul Women's UniversitySeoulKorea
| | - Alex M. Murphy
- Department of Plant SciencesUniversity of CambridgeCambridgeUK
| | - John P. Carr
- Department of Plant SciencesUniversity of CambridgeCambridgeUK
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Abdelkhalek A, El-Gendi H, Alotibi FO, Al-Askar AA, Elbeaino T, Behiry SI, Abd-Elsalam KA, Moawad H. Ocimum basilicum-Mediated Synthesis of Silver Nanoparticles Induces Innate Immune Responses against Cucumber Mosaic Virus in Squash. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11202707. [PMID: 36297731 PMCID: PMC9609463 DOI: 10.3390/plants11202707] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2022] [Revised: 10/02/2022] [Accepted: 10/11/2022] [Indexed: 06/12/2023]
Abstract
Cucumber mosaic virus (CMV) causes a significant threat to crop output sustainability and human nutrition worldwide, since it is one of the most prevalent plant viruses infecting most kinds of plants. Nowadays, different types of nanomaterials are applied as a control agent against different phytopathogens. However, their effects against viral infections are still limited. In the current study, the antiviral activities of the biosynthesized silver nanoparticles (Ag-NPs) mediated by aqueous extract of Ocimum basilicum against cucumber mosaic virus in squash (Cucurbita pepo L.) were investigated. The prepared Ag-NPs were characterized using scanning electron microscopy (SEM), dynamic light scattering (DLS), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR) and zeta potential distribution techniques. DLS, SEM, and TEM analyses showed that the Ag-NPs were spherical, with sizes ranging from 26.3 to 83 nm with an average particle size of about 32.6 nm. FTIR identified different functional groups responsible for the capping and stability of Ag-NPs. The zeta potential was reported as being -11.1 mV. Under greenhouse conditions, foliar sprays of Ag-NPs (100 µg/mL) promoted growth, delayed disease symptom development, and significantly reduced CMV accumulation levels of treated plants compared to non-treated plants. Treatment with Ag-NPs 24 h before or after CMV infection reduced CMV accumulation levels by 92% and 86%, respectively. There was also a significant increase in total soluble carbohydrates, free radical scavenging activity, antioxidant enzymes (PPO, SOD, and POX), as well as total phenolic and flavonoid content. Furthermore, systemic resistance was induced by significantly increasing the expression levels of pathogenesis-related genes (PR-1 and PR-5) and polyphenolic pathway genes (HCT and CHI). These findings suggest that Ag-NPs produced by O. basilicum could be used as an elicitor agent and as a control agent in the induction and management of plant viral infections.
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Affiliation(s)
- Ahmed Abdelkhalek
- Plant Protection and Biomolecular Diagnosis Department, ALCRI, City of Scientific Research and Technological Applications, New Borg El Arab City 21934, Egypt
| | - Hamada El-Gendi
- Bioprocess Development Department, Genetic Engineering and Biotechnology Research Institute, City of Scientific Research and Technological Applications, New Borg El-Arab City 21934, Egypt
| | - Fatimah O. Alotibi
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Abdulaziz A. Al-Askar
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Toufic Elbeaino
- Istituto Agronomico Mediterraneo di Bari (CIHEAM-IAMB), Via Ceglie 9, Valenzano, 70010 Bari, Italy
| | - Said I. Behiry
- Agricultural Botany Department, Faculty of Agriculture (Saba Basha), Alexandria University, Alexandria 21531, Egypt
| | - Kamel A. Abd-Elsalam
- Plant Pathology Research Institute, Agricultural Research Centre, Giza 12619, Egypt
| | - Hassan Moawad
- Agriculture Microbiology Department, National Research Centre, Cairo 12622, Egypt
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