Abstract
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. To our best knowledge, this is the first report on the simultaneous detection of five different apple viruses and two viroids through using a DNA macroarray, therefore, we suggest that this detection protocol and procedure be used for any apple viral diagnosis before setting up a production nursery for virus-free apple seedlings.
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