Establishment of three new genera in the family Geminiviridae: Becurtovirus, Eragrovirus and Turncurtovirus

Abstract

The family Geminiviridae includes plantinfecting circular single-stranded DNA viruses that have geminate particle morphology. Members of this family infect both monocotyledonous and dicotyledonous plants and have a nearly global distribution. With the advent of new molecular tools and low-cost sequencing, there has been a significant increase in the discovery of new geminiviruses in various cultivated and non-cultivated plants.In this communication, we highlight the establishment of three new genera (Becurtovirus, Eragrovirus and Turncurtovirus) to accommodate various recently discovered geminiviruses that are highly divergent and, in some cases, have unique genome architectures. The genus Becurtovirus has two viral species, Beet curly top Iran virus (28 isolates; leafhopper vector Circulifer haematoceps) and Spinach curly top Arizona virus (1 isolate; unknown vector), whereas the genera Eragrovirus and Turncurtovirus each have a single assigned species: Eragrostis curvula streak virus (6 isolates; unknown vector) and Turnip curly top virus (20 isolates; leafhopper vector Circulifer haematoceps), respectively. Based on analysis of all of the genome sequences available in public databases for each of the three new genera, we provide guidelines and protocols for species and strain classification within these three new genera.Electronic supplementary material The online version of this article

Revisiting the taxonomy of the family Circoviridae: establishment of the genus Cyclovirus and removal of the genus Gyrovirus

“…There might be instances when it is difficult to classify a new sequence based on the established species demarcation criteria. Here we provide guidelines on how to approach conflicts based on recommendations for classifying species from the family Geminiviridae, another group of Rep-encoding circular, ssDNA viruses [6,55,87,88]. Species assignments might be uncertain when:…”

Emerging threats of begomoviruses to the cultivation of medicinal and aromatic crops and their management strategies

“…These genera have been established according to genome organization, transreplication of genomic component, vector range, host range and coat protein characteristics [44,154]. Begomoviruses are divided into Old and New world where monopartite begomoviruses are mostly old world (OW) with few bipartite viruses while new world (NW) begomoviruses are all bipartites.…”

Tomato Leaf Curl Sudan Virus (TLCSDV) causing leaf curl disease on a new host Amaranthus cruentus L.

“…Begomoviruses belongs to family Geminiviridae are serious problems for many crops globally. The family Geminiviridae has now been reported to have seven genera known as Mastrevirus, Curtovirus, Begomovirus, Topocuvirus, Eragrovirus, Turncurtovirus, Becurtovirus (Muhire et al, 2014;Brown et al, 2015;Varsani et al, 2014). Members of the genus begomovirus have circular single-stranded DNA (ssDNA) with either a mono-or bipartite genome.The bipartite begomovirus genome has two ssDNA molecules (~2.7 kb), known as DNA-A and DNA-B while mono-partite begomovirus has only DNA-A with satellite molecule known as betasatellites (Briddon et al, 2003).…”