Omics in Plant Disease Resistance Current Issues in Molecular Biology
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Relationship Between Insect Vectors Abundance And
RELATIONSHIP BETWEEN INSECT VECTORS ABUNDANCE AND OCCURRENCE OF RICE YELLOW MOTTLE VIRUS IN FARMERS’ FIELDS IN KILOMBERO DISTRICT BONAVENTURE JANUARY A DISSERTATION SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN CROP SCIENCE OF SOKOINE UNIVERSITY OF AGRICULTURE. MOROGORO, TANZANIA. 2012 ii ABSTRACT Rice yellow mottle virus (RYMV) endemic to Africa is spread within and between rice fields by several species of Chrysomelid beetles and grasshoppers. In Tanzania and particularly in Kilombero District, the virus is increasingly becoming a serious problem to rice production. The relationships between the insect vectors and RYMV disease incidence and severity were not fully known hence the need for this study. The assessment of both disease incidence and severity of RYMV and population abundance of its insect’s vectors were conducted in the three divisions of Mngeta, Ifakara and Mang’ula in Kilombero District, Tanzania in 4m2 quadrat. Insect sampling was conducted using sweep net while RYMD incidence and severity were visually assessed in a 4 m2 quadrat. Results of the insect identification indicated the presence of two insect vectors of RYMV i.e. (Chaetocnema spp. and O. hyla). The population densities of these RYMV vectors were higher at the border parts of the rice fields than at the middle parts. On the other hand, the incidence and severity of RYMV disease increased with the age of the crop. Results of within field distribution also indicated a random distribution of RYMV-affected plants in the rice fields in the agro ecosystem. The field studies of the virus–vector relationship established that RYMV occurrence varied in space and time and crop development stages. -
Molecular Studies of Piscine Orthoreovirus Proteins
Piscine orthoreovirus Series of dissertations at the Norwegian University of Life Sciences Thesis number 79 Viruses, not lions, tigers or bears, sit masterfully above us on the food chain of life, occupying a role as alpha predators who prey on everything and are preyed upon by nothing Claus Wilke and Sara Sawyer, 2016 1.1. Background............................................................................................................................................... 1 1.2. Piscine orthoreovirus................................................................................................................................ 2 1.3. Replication of orthoreoviruses................................................................................................................ 10 1.4. Orthoreoviruses and effects on host cells ............................................................................................... 18 1.5. PRV distribution and disease associations ............................................................................................. 24 1.6. Vaccine against HSMI ............................................................................................................................ 29 4.1. The non ......................................................37 4.2. PRV causes an acute infection in blood cells ..........................................................................................40 4.3. DNA -
Seasonal Occurrence of Rice Yellow Mottle Virus in Lowland Rice in Côte D’Ivoire
University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Faculty Publications: Department of Entomology Entomology, Department of 1997 Seasonal Occurrence of Rice Yellow Mottle Virus in Lowland Rice in Côte d’Ivoire E. A. Heinrichs A. A. Sy S. K. Akator I. Oyediran Follow this and additional works at: https://digitalcommons.unl.edu/entomologyfacpub Part of the Agriculture Commons, Agronomy and Crop Sciences Commons, Entomology Commons, and the Plant Pathology Commons This Article is brought to you for free and open access by the Entomology, Department of at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Faculty Publications: Department of Entomology by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Published in International Journal of Pest Management 43:4 (1997), pp. 291–297; doi: 10.1080/096708797228591 Copyright © 1997 Taylor & Francis Ltd. Used by permission. Published online November 26, 2010. Seasonal Occurrence of Rice Yellow Mottle Virus in Lowland Rice in Côte d’Ivoire E. A. Heinrichs, A. A. Sy, S. K. Akator, and I. Oyediran West Africa Rice Development Association, B. P. 2551, Bouaké, Côte d’Ivoire, West Africa Abstract Monthly plantings of the rice variety Bouaké 189 were made under lowland irrigated conditions, to obtain information on the phenological and seasonal occurrence of pests and diseases on the West African Rice Development Association (WARDA) research farm near Bouaké, Côte d’Ivoire. Regular sampling of insect pests and observations on rice yellow mottle virus (RYMV) disease infection throughout the year provided information on the occurrence of RYMV and potential insect vectors. RYMV incidence and grain yields varied depending on planting date, and for a given planting date, varied from one year to another. -
RNA Silencing-Based Improvement of Antiviral Plant Immunity
viruses Review Catch Me If You Can! RNA Silencing-Based Improvement of Antiviral Plant Immunity Fatima Yousif Gaffar and Aline Koch * Centre for BioSystems, Institute of Phytopathology, Land Use and Nutrition, Justus Liebig University, Heinrich-Buff-Ring 26, D-35392 Giessen, Germany * Correspondence: [email protected] Received: 4 April 2019; Accepted: 17 July 2019; Published: 23 July 2019 Abstract: Viruses are obligate parasites which cause a range of severe plant diseases that affect farm productivity around the world, resulting in immense annual losses of yield. Therefore, control of viral pathogens continues to be an agronomic and scientific challenge requiring innovative and ground-breaking strategies to meet the demands of a growing world population. Over the last decade, RNA silencing has been employed to develop plants with an improved resistance to biotic stresses based on their function to provide protection from invasion by foreign nucleic acids, such as viruses. This natural phenomenon can be exploited to control agronomically relevant plant diseases. Recent evidence argues that this biotechnological method, called host-induced gene silencing, is effective against sucking insects, nematodes, and pathogenic fungi, as well as bacteria and viruses on their plant hosts. Here, we review recent studies which reveal the enormous potential that RNA-silencing strategies hold for providing an environmentally friendly mechanism to protect crop plants from viral diseases. Keywords: RNA silencing; Host-induced gene silencing; Spray-induced gene silencing; virus control; RNA silencing-based crop protection; GMO crops 1. Introduction Antiviral Plant Defence Responses Plant viruses are submicroscopic spherical, rod-shaped or filamentous particles which contain different kinds of genomes. -
Review Article Insect Vectors of Rice Yellow Mottle Virus
Hindawi Publishing Corporation Journal of Insects Volume 2015, Article ID 721751, 12 pages http://dx.doi.org/10.1155/2015/721751 Review Article Insect Vectors of Rice Yellow Mottle Virus Augustin Koudamiloro,1,2 Francis Eegbara Nwilene,3 Abou Togola,3 and Martin Akogbeto2 1 Africa Rice Center (AfricaRice), 01 BP 2031 Cotonou, Benin 2University of Abomey-Calavi, 01 BP 4521 Cotonou, Benin 3AfricaRice Nigeria Station, c/o IITA, PMB 5320, Ibadan, Nigeria Correspondence should be addressed to Augustin Koudamiloro; [email protected] Received 9 July 2014; Revised 2 November 2014; Accepted 5 November 2014 Academic Editor: Rostislav Zemek Copyright © 2015 Augustin Koudamiloro et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Rice yellow mottle virus (RYMV) is the major viral constraint to rice production in Africa. RYMV was first identified in 1966 in Kenya and then later in most African countries where rice is grown. Several studies have been conducted so far on its evolution, pathogenicity, resistance genes, and especially its dissemination by insects. Many of these studies showed that, among RYMV vectors, insects especially leaf-feeders found in rice fields are the major source of virus transmission. Many studies have shown that the virus is vectored by several insect species in a process of a first ingestion of leaf material and subsequent transmission in following feedings. About forty insect species were identified as vectors of RYMV since 1970 up to now. They were essentially the beetles, grasshoppers, and the leafhoppers. -
The Battle for Survival Between Viruses and Their Host Plants
Available online at www.sciencedirect.com ScienceDirect The battle for survival between viruses and their host plants 1 2 Adnane Boualem , Catherine Dogimont and 1 Abdelhafid Bendahmane Evolution has equipped plants with defense mechanisms to and their impact on crop production, second, to present counterattack virus infections. However, some viruses have the current state of knowledge on vectors for virus trans- acquired the capacity to escape these defense barriers. In their mission, and third, to summarize recent progress in un- combats, plants use mechanisms such as antiviral RNA silencing derstanding plant resistance against viruses focusing on that viruses fight against using silencing-repressors. Plants the R genes mediated dominant resistance. could also resist by mutating a host factor required by the virus to complete a particular step of its infectious cycle. Another Viruses and diseases successful mechanism of resistance is the hypersensitive Viruses are obligate intracellular parasites absolutely de- response, where plants engineer R genes that recognize pendent on the host cell machinery to multiply and specifically their assailants. The recognition is followed by the spread. They are nucleic acid-based pathogens with triggering of a broad spectrum resistance. New understanding of genomes that consist of single-stranded or double-strand- such resistance mechanisms will probably helps to propose new ed RNAs or DNAs encoding few genes and usually means to enhance plant resistance against viruses. packed into protein envelopes called the capsid. Viruses Addresses invade all forms of life and viral infection causes physio- 1 Institute of Plant Sciences Paris-Saclay, IPS2, INRA, CNRS, Univ. logical disorders leading to diseases. -
Development of Leafhopper Cell Culture to Trace the Early Infection Process of a Nucleorhabdovirus, Rice Yellow Stunt Virus, In
Wang et al. Virology Journal (2018) 15:72 https://doi.org/10.1186/s12985-018-0987-6 RESEARCH Open Access Development of leafhopper cell culture to trace the early infection process of a nucleorhabdovirus, rice yellow stunt virus, in insect vector cells Haitao Wang, Juan Wang, Yunjie Xie, Zhijun Fu, Taiyun Wei* and Xiao-Feng Zhang* Abstract Background: In China, the rice pathogen Rice yellow stunt virus (RYSV), a member of the genus Nucleorhabdovirus in the family Rhabdoviridae, was a severe threat to rice production during the1960s and1970s. Fundamental aspects of the biology of this virus such as protein localization and formation of the RYSV viroplasm during infection of insect vector cells are largely unexplored. The specific role(s) of the structural proteins nucleoprotein (N) and phosphoprotein (P) in the assembly of the viroplasm during RYSV infection in insect vector is also unclear. Methods: In present study, we used continuous leafhopper cell culture, immunocytochemical techniques, and transmission electron microscopy to investigate the subcellular distributions of N and P during RYSV infection. Both GST pull-down assay and yeast two-hybrid assay were used to assess the in vitro interaction of N and P. The dsRNA interference assay was performed to study the functional roles of N and P in the assembly of RYSV viroplasm. Results: Here we demonstrated that N and P colocalized in the nucleus of RYSV-infected Nephotettix cincticeps cell and formed viroplasm-like structures (VpLSs). The transiently expressed N and P are sufficient to form VpLSs in the Sf9 cells. In addition, the interactions of N/P, N/N and P/P were confirmed in vitro. -
RICE YELLOW MOTTLE SOBOMOVIRUS: a LIMITING FACTOR in Supported by RICE PRODUCTION in AFRICA
RICE YELLOW MOTTLE SOBOMOVIRUS: A LIMITING FACTOR IN Supported by RICE PRODUCTION IN AFRICA G. Alkali1*, M. D. Alegbejo2, B. D. Kashina2 and O. O. Banwo2 1Department of Crop Protection, University of Maiduguri, Borno State, Nigeria 2Department of Crop Protection, Institute for Agricultural Research, Ahmadu Bello University, Zaria, Nigeria Corresponding author: [email protected] Received: April 17, 2017 Accepted: September 26, 2017 Abstract: Rice is the primary and secondary host of many viruses, but the most important in Africa is the rice yellow mottle virus (RYMV) genus Sobemovirus. It is endemic in the continent and became important after the introduction of new high yielding exotic varieties from Asia that are susceptible to the virus. The pathogen was first noticed in 1966 in Kenya but it has since spread to other parts of Africa countries. It is environmentally stable, highly infectious and about six strains of the virus now exist. Transmitted both mechanically and by insect vectors belonging to the families Chrysomelidae (Chaetocnema spp., Dactylispa spp., Hispa unsambarica Weise, Sesselia pusilla Gartucker, Trichispa sericea Guerin); Tettigonidae (Conocephalus longipennis de Haan, C. merumontamus Sjostedt) and Coccinelidane (Chnootriba similis Thunberg). Yield losses caused by the virus range from 25 to 100%. Integrated pest management and breeding for resistant varieties are the best strategies so far suggested to reduce havoc caused by this pathogen to rice. This paper reviews the economic importance, distribution, host range, symptom, transmission, varietal reaction, yield loss assessment, epidemiology, molecular characteristics, management strategies and future research needs of the virus. Keywords: Epidemiology, host range, molecular characterization, symptomatology Introduction far: S1, S2 and S3 in West and Central Africa, S4, S5 and S6 Rice (Oryza sativa L.) plant is annual grasses belonging to the in East Africa (Pinel et al., 2000; Fargette et al., 2002; Banwo genus Oryzeae in the family Poaceae. -
Southern Rice Black-Streaked Dwarf Virus: a White-Backed Planthopper-Transmitted fijivirus Threatening Rice Production in Asia
REVIEW ARTICLE published: 09 September 2013 doi: 10.3389/fmicb.2013.00270 Southern rice black-streaked dwarf virus: a white-backed planthopper-transmitted fijivirus threatening rice production in Asia Guohui Zhou*, Donglin Xu, Dagao Xu and Maoxin Zhang College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China Edited by: Southern rice black-streaked dwarf virus (SRBSDV), a non-enveloped icosahedral virus with Nobuhiro Szuzki, Tohoku University, a genome of 10 double-stranded RNA segments, is a novel species in the genus Fijivirus Japan (family Reoviridae) first recognized in 2008. Rice plants infected with this virus exhibit Reviewed by: symptoms similar to those caused by Rice black-streaked dwarf virus. Since 2009, the virus Takahide Sasaya, National Agriculture and Food Research Organization, has rapidly spread and caused serious rice losses in East and Southeast Asia. Significant Japan progress has been made in recent years in understanding this disease, especially about the Taiyun Wei, Fujian Agriculture and functions of the viral genes, rice–virus–insect interactions, and epidemiology and control Forestry University, China measures.The virus can be efficiently transmitted by the white-backed planthopper (WBPH, *Correspondence: Sogatella furcifera) in a persistent circulative propagative manner but cannot be transmitted Guohui Zhou, College of Natural Resources and Environment, South by the brown planthopper (Nilaparvata lugens) and small brown planthopper (Laodelphax China Agricultural University, striatellus). Rice, maize, Chinese sorghum (Coix lacryma-jobi) and other grass weeds can Guangzhou, Guangdong 510642, be infected via WBPH. However, only rice plays a major role in the virus infection cycle China e-mail: [email protected] because of the vector’s preference. -
Systematic Identification and Functional Analysis of Circular
fmicb-11-588009 September 26, 2020 Time: 19:2 # 1 ORIGINAL RESEARCH published: 29 September 2020 doi: 10.3389/fmicb.2020.588009 Systematic Identification and Functional Analysis of Circular RNAs During Rice Black-Streaked Dwarf Virus Infection in the Laodelphax striatellus (Fallén) Midgut Jianhua Zhang1†, Haitao Wang1,2†, Wei Wu1, Yan Dong1,2, Man Wang1,2, Dianshan Yi3, Yijun Zhou1,2 and Qiufang Xu1,2* Edited by: Xiaofei Cheng, 1 Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China, 2 Key Laboratory of Food Quality Northeast Agricultural University, and Safety of Jiangsu Province – State Key Laboratory Breeding Base, Nanjing, China, 3 Nanjing Plant Protection China and Quarantine Station, Nanjing, China Reviewed by: Jing Li, Circular RNAs (circRNAs) are endogenous RNAs that have critical regulatory roles in ZheJiang Academy of Agricultural Sciences, China numerous biological processes. However, it remains largely unknown whether circRNAs Tong Zhang, are induced in response to plant virus infection in the insect vector of the virus as South China Agricultural University, China well as whether the circRNAs regulate virus infection. Rice black-streaked dwarf virus *Correspondence: (RBSDV) is transmitted by Laodelphax striatellus (Fallén) in a persistent propagative Qiufang Xu manner and causes severe losses in East Asian countries. To explore the expression [email protected] and function of circRNAs in the regulation of virus infection, we determined the circRNA † These authors have contributed expression profile in RBSDV-free or RBSDV-infected L. striatellus midgut tissues by equally to this work RNA-Seq. A total of 2,523 circRNAs were identified, of which thirteen circRNAs Specialty section: were differentially expressed after RBSDV infection. -
Taxonomic Implications for Fijiviruses Based on the Terminal Sequences of Fiji Disease fijivirus
Arch Virol (1999) 144: 2259–2263 Taxonomic implications for Fijiviruses based on the terminal sequences of Fiji disease fijivirus Brief Report J. A. McMahon, J. L. Dale, and R. M. Harding Centre for Molecular Biotechnology, School of Life Sciences, Queensland University of Technology, Brisbane, Queensland, Australia Accepted May 14, 1999 Summary. The 50 and 30 terminal sequences of the plus strand of Fiji disease fijivirus (FDV) segments 2, 3, 9 and 10 possess the conserved terminal sequences, 50AAGUUUUU.....CAGCAGAUGUC 30. The 50 sequence is identical to that of maize rough dwarf fijivirus (MRDV) and rice black-streaked dwarf fijivirus (RB- SDV), whereas the FDV 30 sequence shares the consensus, CAGCNNNNGUC, with MRDV and RBSDV. The FDV terminal sequences, and the amino acid se- quences from FDV segment 9, are more closely related to those from MRDV and RBSDV than to those from oat sterile dwarf fijivirus (OSDV) and Nilaparvata lugens reovirus (NLRV; a putative Fijivirus). ∗ Plant-infecting reoviruses are classified into three genera, Phytoreovirus, Fijivirus and Oryzavirus, based on the number and size of genome segments and their elec- trophoretic profile, virion morphology, serology and insect vectors [2]. Fiji disease fijivirus (FDV) is the type member of the genus Fijivirus and the sole member of its serogroup 1. Serogroup 2 fijiviruses include rice black-streaked dwarf virus (RBSDV), maize rough dwarf virus (MRDV) and pangola stunt virus, whereas the sole member of serogroup 3 is oat sterile dwarf virus (OSDV) [7]. Sequence analyses of several segments of MRDV and RBSDV have shown that the 50 and 30 terminal sequences, 50AAGUUUUU......GUC 30, are found in the genomes of the two serogroup 2 viruses [6, 1]. -
End Uridylation in Eukaryotic RNA Viruses
www.nature.com/scientificreports OPEN Widespread 3′-end uridylation in eukaryotic RNA viruses Yayun Huo1,*, Jianguo Shen2,*, Huanian Wu1, Chao Zhang1, Lihua Guo3, Jinguang Yang4 & Weimin Li1 Received: 01 March 2016 RNA 3′ uridylation occurs pervasively in eukaryotes, but is poorly characterized in viruses. In this Accepted: 15 April 2016 study, we demonstrate that a broad array of RNA viruses, including mycoviruses, plant viruses and Published: 06 May 2016 animal viruses, possess a novel population of RNA species bearing nontemplated oligo(U) or (U)-rich tails, suggesting widespread 3′ uridylation in eukaryotic viruses. Given the biological relevance of 3′ uridylation to eukaryotic RNA degradation, we propose a conserved but as-yet-unknown mechanism in virus-host interaction. Addition of non-templated nucleotides to 3′ -ends of RNA transcripts is a well-known type of post-transcriptional RNA modification in kingdoms of life. The most understood example within this category is polyadenylation, by which multiple adenosines are progressively added to the 3′ -ends of RNA substrates by the canonical poly(A) polymerase (PAP) or non-canonical PAP, thereby resulting in poly(A) or poly(A)-rich tails1–3. This process occurs in almost all organisms but plays opposite roles in control of RNA stability. The long poly(A) tail at the mature 3′ -ends of nucleus-encoded mRNAs in eukaryotes is a key determinant of transcripts stability, as well as nucle- ocytoplasmic export and translation initiation1,4. By contrast, the poly(A) or poly(A)-rich stretches, which are associated with the fragmented molecules of both coding and non-coding RNAs in prokaryotes, eukaryotes and organelles, serve as toeholds for 3′ to 5′ exoribonucleases to attack the RNA2,5,6.