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Genome-based identification of beet curly top Iran virus infecting sugar beet in Turkey and investigation of its pathogenicity by agroinfection. 2022

Kubilay Yıldırım, and Musa Kavas, and Rıza Kaya, and Zafer Seçgin, and Cansu Can, and Ilkay Sevgen, and Çiğdem Gökçek Saraç, and Vahid Tahan
Ondokuz Mayıs University, Dep.of Molecular Biology and Genetics, Samsun, Turkey. Electronic address: kubilay.yildirim@omu.edu.tr.

Beet curly top disease (BCTD) is a yield-limiting viral infection of sugar beet (Beta vulgaris) throughout the arid and semi-arid regions of the world. Two virus species, belonging to two different genera of the family Geminiviridae (Curtovirus and Becurtovirus) had been described as the disease's causative agents on sugar beet. Despite the detection of the BCTD in some sugar beet fields of Turkey sixty years ago, the genome based characterization of BCTD-associated viruses have not been studied previously. In this study, 628 sugar beet plants exhibiting BCTD symptoms were collected from fourteen cities in central Anatolia, the major sugar beet production areas in Turkey. PCR assays of these samples using the respective Curtovirus and Becurtovirus genus-specific primers indicated that the Turkish sugar beet samples' viral sequences belong only to the genus Becurtovirus. The results of sequencing and phylogenetic analysis of the partial genome of the virus obtained from fourteen cities confirmed that BCTD-associated virus in Turkish sugar beet fields is beet curly top Iran virus (BCTIV-Becurtovirus) species. The whole genome of the collected viruses from fourteen cities were amplified by the rolling circle amplification (RCA) and the five most phylogenetically diverse viruses obtained from Afyon, Ankara, Adapazarı, Yozgat and Aksaray were sequenced. The results of whole genome sequence analysis indicated >98 % sequence identities with that of a BCTIV variants reported from Urmia province (bordering Turkey) of Iran. A virus genome from Yozgat city had a genomic sequence identity of >97 % with those of BCTIV isolated from cowpea, tomato, pepper and sugar beet in the northern part of Iran. These results suggested that the spread of BCTIV through the region could create a significant threat to the production of sugar beet as well as other agricultural crops. A tandem dimer of a BCTIV-Turkish variant isolated from Ankara city was cloned into Agrobacterium plasmid to be used for agro-infection studies. Agroinoculation of this construct on sugar beet leaves generated severe BCTD symptoms (84 %) which were also confirmed by RCA and qPCR analysis. These results constituted the first genome based characterization of BCTIV Turkish variants and the first report of BCTIV spreading out of Iran.

UI MeSH Term Description Entries
D007492 Iran A country bordering the Gulf of Oman, the Persian Gulf, and the Caspian Sea, between Iraq and Pakistan. The capital is Tehran. Islamic Republic of Iran
D010802 Phylogeny The relationships of groups of organisms as reflected by their genetic makeup. Community Phylogenetics,Molecular Phylogenetics,Phylogenetic Analyses,Phylogenetic Analysis,Phylogenetic Clustering,Phylogenetic Comparative Analysis,Phylogenetic Comparative Methods,Phylogenetic Distance,Phylogenetic Generalized Least Squares,Phylogenetic Groups,Phylogenetic Incongruence,Phylogenetic Inference,Phylogenetic Networks,Phylogenetic Reconstruction,Phylogenetic Relatedness,Phylogenetic Relationships,Phylogenetic Signal,Phylogenetic Structure,Phylogenetic Tree,Phylogenetic Trees,Phylogenomics,Analyse, Phylogenetic,Analysis, Phylogenetic,Analysis, Phylogenetic Comparative,Clustering, Phylogenetic,Community Phylogenetic,Comparative Analysis, Phylogenetic,Comparative Method, Phylogenetic,Distance, Phylogenetic,Group, Phylogenetic,Incongruence, Phylogenetic,Inference, Phylogenetic,Method, Phylogenetic Comparative,Molecular Phylogenetic,Network, Phylogenetic,Phylogenetic Analyse,Phylogenetic Clusterings,Phylogenetic Comparative Analyses,Phylogenetic Comparative Method,Phylogenetic Distances,Phylogenetic Group,Phylogenetic Incongruences,Phylogenetic Inferences,Phylogenetic Network,Phylogenetic Reconstructions,Phylogenetic Relatednesses,Phylogenetic Relationship,Phylogenetic Signals,Phylogenetic Structures,Phylogenetic, Community,Phylogenetic, Molecular,Phylogenies,Phylogenomic,Reconstruction, Phylogenetic,Relatedness, Phylogenetic,Relationship, Phylogenetic,Signal, Phylogenetic,Structure, Phylogenetic,Tree, Phylogenetic
D010935 Plant Diseases Diseases of plants. Disease, Plant,Diseases, Plant,Plant Disease
D000073893 Sugars Short chain carbohydrate molecules that have hydroxyl groups attached to each carbon atom unit with the exception of one carbon that has a doubly-bond aldehyde or ketone oxygen. Cyclical sugar molecules are formed when the aldehyde or ketone groups respectively form a hemiacetal or hemiketal bond with one of the hydroxyl carbons. The three dimensional structure of the sugar molecule occurs in a vast array of biological and synthetic classes of specialized compounds including AMINO SUGARS; CARBASUGARS; DEOXY SUGARS; SUGAR ACIDS; SUGAR ALCOHOLS; and SUGAR PHOSPHATES. Sugar
D014421 Turkey Country in Southeastern Europe and Southwestern Asia bordering the Black Sea, between Bulgaria and Georgia, and bordering the Aegean Sea and the Mediterranean Sea, between Greece and Syria. The capital is Ankara. Turkiye
D014774 Virulence The degree of pathogenicity within a group or species of microorganisms or viruses as indicated by case fatality rates and/or the ability of the organism to invade the tissues of the host. The pathogenic capacity of an organism is determined by its VIRULENCE FACTORS. Pathogenicity
D017791 Geminiviridae A family of plant viruses where the VIRION possesses an unusual morphology consisting of a pair of isometric particles. Transmission occurs via leafhoppers or whitefly. Some viruses cause economically important diseases in cultivated plants. There are four genera: Mastrevirus, Curtovirus, Topocuvirus, and BEGOMOVIRUS. Curtovirus,Geminivirus,Mastrevirus,Topocuvirus,Curtoviruses,Geminiviruses,Mastreviruses,Topocuviruses
D027461 Beta vulgaris A species of the Beta genus. Cultivars are used as a source of beets (root) or chard (leaves). Beets,Chard,Beet,Beta vulgari,Chards,vulgari, Beta

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