RESUMO
A 26 base long oligodeoxyribonucleotide complementary to a common RNA sequence of potato spindle tuber viroid (PSTV) and chrysantemum stunt viroid (CSV) was synthesized. The 3'-end biotinylated one was used for the detection of PSTV and CSV RNA immobilized on nitrocellulose filters by nucleic acid hybridization. Visualization of hybridization results was performed by two ways, either by streptavidin-alkaline phosphatase conjugate or streptavidine and biotinylated alkaline phosphatase. It was possible to detect 0.65 ng of purified CSV and PSTV RNA. The suggested system of viroid diseases detection can be used by agricultural and horticultural enterprises.
Assuntos
Biotina/química , Oligodesoxirribonucleotídeos/química , Vírus de Plantas/isolamento & purificação , Fosfatase Alcalina/análise , Sequência de Bases , Dados de Sequência Molecular , Hibridização de Ácido Nucleico , Sondas de Oligonucleotídeos , Doenças das Plantas/microbiologia , RNA Viral/análiseRESUMO
26 base long deoxyribonucleotide complementary to the lower part of the Central Conserved Region of chrysanthemum stund viroid (CSV) was used for synthesis of the first strand cDNA. The cDNA was cloned into plasmid vector pUC19 and the primary structure was determined. Cloned, full length cDNA was used as hybridisation probe for detection of CSV. It was possible to detect about 26 pg of purified CSV RNA immobilized on nitrocellulose filters using 32P-labeled probe. In the case of biotinylated probe it was possible to detect about 26 pg of purified CSV RNA visualizing results by streptavidin-alkaline phosphatase conjugates. It has been shown that such a cloned cDNA can be used for wide scale detection of CSV.