Begomoviruses are either monopartite and bipartite, meaning that their genome is composed of a single or two molecules of circular ssDNA and TYLCV is a monopartite virus. From: Encyclopedia of Virology (Third Edition), 2008.
Begomovirus is a genus of viruses, in the family Geminiviridae. They are plant viruses that as a group have a very wide host range, infecting dicotyledonous plants. Worldwide they are responsible for a considerable amount of economic damage to many important crops such as tomatoes, beans, squash, cassava and cotton.
Begomoviruses ( Geminiviridae family) represent a severe constraint to agriculture worldwide. As ssDNA viruses that replicate in the nuclei of infected cells, the nascent viral DNA has to move to the cytoplasm and then to the adjacent cell to cause disease. The begomovirus nuclear shuttle protein (NSP) assists the intracellular transport of viral DNA from the nucleus to the cytoplasm and.Classification of viruses is a constant work in progress done by the International Committee on Taxonomy of Viruses (ICTV) with the identification and addition of new viral species. Over the past two decades classification of viruses has gradually evolved to name and group viral entities in a more pertinent and universally accepted way.Begomoviruses have small genomes (2.5-2.7 x 103 nucleotides) that are packaged as ssDNA into virions and occur as double-stranded DNA (dsDNA) in nuclei of infected plant cells. Their genomes can consist of one DNA molecule or two DNA components (DNA-A and DNA-B), both of which are required for systemic infection (Fig. 1A). The circular genomes contain divergent transcription units separated by.
A collection of cultivated and non-cultivated species of cotton (Gossypium spp.) has been maintained for the last four decades in Multan, Pakistan. This geographical location has been observed as a hotspot for the evolution of begomoviruses and satellites associated with cotton leaf curl disease (CLCuD). Recent studies showed that begomoviruses responsible for the CLCuD epidemic in the 1990s.
Based on the analysis of 3,123 full-length begomovirus genome (or DNA-A component) sequences available in public databases as of December 2012, a set of revised guidelines for the classification and nomenclature of begomoviruses are proposed. The guidelines primarily consider a) genus-level biological characteristics and b) results obtained using a standardized classification tool, Sequence.
Begomoviruses are one of the most interesting plant viruses to study for basic and applied research as they cause huge economic losses to agriculture industries and farmers all over the world. They belong to family Geminiviridae and are emergent plant viral pathogens which cause diseases in various crops in the tropical and subtropical regions. They are transmitted by the whitefly B. tabaci.
Abstract Betasatellites are a group of circular, single-stranded DNA molecules that are found frequently associated with monopartite begomoviruses of the family Geminiviridae. Betasatellites.
Classification of viruses. 6 1.2. Family Geminiviridae. Begomoviruses are efficiently transmitted by whiteflies of the Bemisia tabaci species complex in a persistent circulative manner (Hanssen et al., 2010). The whitefly vector is widely distributed in subtropical and tropical regions and viruses transmitted by whiteflies have emerged as a major disease threat to agriculture in many.
International Co mmittee on the Taxonomy of Viruses (ICTV) for the provisional classification of begomoviruses when complete genome sequences are unavailable (40).
Deltasatellites are small noncoding DNA satellites associated with begomoviruses. The study presented here has investigated the biology of two deltasatellites found in wild malvaceous plants in th.
The first epidemic of cotton leaf curl disease (CLCuD) in early 1990’s in the Indian subcontinent was associated with several distinct begomoviruses along with a disease-specific betasatellite.
ABSTRACT. Viruses of to the family Geminiviridae are considered some of the most important pathogens in tropical and subtropical regions of the world. Members of one Geminiviridae genus, Begomovirus, have been causing severe losses, particularly in tomato (Lycopersicon esculentum) production in the Americas and the Caribbean.Several new begomoviruses have been reported in the region and, at.
Begomoviruses in Cuba: Brief history and current status: Responsibility: Sangeeta Saxena, A.K. Tiwari, editors. Abstract: Begomoviruses are one of the most interesting plant viruses to study for basic and applied research as they cause huge economic losses to agriculture industries and farmers all over the world. They belong to family Geminiviridae and are emergent plant viral pathogens which.
Soil Morphology, Formation and Classification - (JJ400). Serological tests are not enough virus-specific because serological relationships among begomoviruses are the norm. Therefore, in order to confirm the virus infection, molecular diagnostic techniques are used which can be highly sensitive and specific. Molecular procedures have been developed for specific or generic detection of.