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Cloning and expression of the coat protein (CP) gene of Apple stem pitting virus (ASPV; Family: Flexiviride, Genus: Foveavirus) using in vivo Escherichia coli and Pichia pastoris as well as in vitro wheat germ extract gene expression system are described. The coat protein gene was amplified for five ASPV isolates representing three groups characterized by a different size of CPs. The amplified RT-PCR products were cloned into bacteria and yeast expression vectors. Plasmid containing the CP gene of the isolate MT32 was used as a template for expression in wheat germ extract. Proteins of expected sizes, reacting with ASPV antiserum in Western blotting ex­periments, were obtained in three expression systems for the different virus isolates used in this study. The purified proteins were used for immunization and preparation of rabbit polyclonal antisera. The obtained antibodies could be used for immunocap- ture RT-PCR detection of ASPV in woody tissue, but ELISA results were not satis­factory.
Viral diseases are a worldwide problem of blueberry which a major limiting factor for production. A survey for Blueberry scorch virus (BlScV) by DAS-ELISA in various organs of highbush blueberry conducted from May 2010 to April 2011, showed the occurrence of these virus in cvs Bluecrop and Herbert, which showing virus-like symptoms. Samples of plant materials (bud flower, flower, leaf, bark) were collected individually from each highbush blueberry plant of every cultivar. It was established that the detection of virus of each the investigated bushes cvs Bluecrop and Herbert depended on the tested plant materials as well as the period in which the tests were performed. The effectiveness of the virus detection varied for the investigated cultivars. The presence of the BlScV was confirmed in leaves samples with specific primer pair which amplifies a 430 bp fragment of the 5’-proximal ORF I [RNA-dependent RNA polymerase (RdRp)].
The presence of phytoplasmas in Lilium sp. showing severely stunted growth, leaf malformation and flower buds deficiency was demonstrated for the first time using polymerase chain reaction assays with primers amplifying phytoplasma 16S rDNA regions. These phytoplasmas were found in leaves as well as roots and bulb scales of symptomatic and CMV and/or LSV affected and asymptomatic virus-free lilies.
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