Genetic Variability and Molecular Evolution of Tomato Mosaic Virus Populations in Three Northern China Provinces.

RNA viruses tend to mutate during transmission and host infection, which is critical to viral adaptation and evolution. Tomato mosaic virus (ToMV) is a member of the genus (family ) and an economically important virus with detrimental effects on tomatoes worldwide. Although the ToMV gene sequences have been completed in China, their genetic diversity and population structure remain unclear.

Simultaneous detection of five viruses and two viroids affecting apples through a DNA macroarray chip.

Multiple infections of various viruses and viroids in apple trees are common and have caused a significant loss in the world apple industry. To provide an early detection of any of those possible pathogens at the molecular level, a multiplex DNA macroarray chip was designed and developed for a simultaneous identification of five common apple viruses and two viroids including apple chlorotic leaf spot virus (ACLSV), apple stem pitting virus (ASPV), apple stem grooving virus (ASGV), apple mosaic virus (ApMV), apple necrosis mosaic virus (ApNMV), apple scar skin viroid (ASSVd), and apple dimple fruit viroid (ADFVd). The macroarray with a 23 bp probe arranged with the coat protein (CP) gene or a target DNA segment of each viruses and viroids has demonstrated a high specificity and sensitivity without any competitions, inhibitions or cross-interferences when it was tested against more than a mixture of viral and viroid samples.