beet yellows virus (byv) belongs to the genus closterovirus, closteroviridae family, is one the most important viruses of sugar beet worldwide. in order to identify and characterize some molecular aspects of the byv, a total of 75 symptomatic leaf samples of sugar beet were collected from sugar beet field of west azarbayjan, hamedan and kermanshah provinces, iran. leaves showing general yellowi...

Members of the Closteroviridae and Potyviridae families of the plant positive-strand RNA viruses encode one or two papain-like leader proteinases. In addition to a C-terminal proteolytic domain, each of these proteinases possesses a nonproteolytic N-terminal domain. We compared functions of the several leader proteinases using a gene swapping approach. The leader proteinase (L-Pro) of Beet yell...

DNA was isolated from clover proliferation (CP) mycoplasmalike organism (MLO)-diseased periwinkle plants (Catharanthus roseus (L.) G. Don.) and cloned into pSP6 plasmid vectors. CP MLO-specific recombinant DNA clones were biotin labeled and used as probes in dot hybridization and restriction fragment length polymorphism analyses to study the genetic interrelatedness among CP MLO and other MLOs,...