Bean calico mosaic begomovirus is a distinct species
Several begomoviruses have been found causing diseases on bean crops in the Americas. Bean golden mosaic geminivirus (EPPO A1 quarantine pest) isolates from Puerto Rico, Dominican Republic and Guatemala have been completely sequenced and belong to one species. Similarly, bean dwarf mosaic begomovirus from Colombia has been sequenced and is considered as a distinct species. It has been shown that bean golden mosaic virus from Brazil is distinct from bean dwarf mosaic begomovirus, and all other bean golden mosaic isolates from the Caribbean. A fourth whitefly-transmitted geminiviridae infecting beans was discovered in Sonora, Mexico, in 1986. This virus was called bean calico mosaic begomovirus. Biotic, molecular and phylogenetic studies showed that it is a clearly distinct begomovirus species. The virus was purified and Koch’ postulates were completed. The experimental host range of bean calico begomovirus includes Malva parviflora, several Phaseolus species, Nicotiana benthamiana and tobacco (N. tabacum). It was also found that Bemisia tabaci biotype B efficiently transmitted this virus. Phylogenetic studies showed that it is closely related to squash leaf curl begomovirus.
Note: this paper mainly focused on taxonomy and no details were provided on the significance of the disease caused by bean calico mosaic begomovirus in the field.
Sources
Brown, J.K.; Ostrow, K.M.; Idris, A.M.; Stenger, D.C. (1999) Biotic, molecular, and phylogenetic characterization of bean calico mosaic virus, a distinct begomovirus species with affiliation in the squash leaf curl virus cluster.
Plant Disease, 89(4), 273-280.