Improvement in the sensitivity of PVYN detection by increasing the cDNA probe size

A. K. Dhar, R. P. Singh

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Cloned cDNA to a North American isolate of tobacco veinal necrotic strain of potato virus Y (PVYN) RNA was used for the detection of PVYN in diseased samples. Digoxigenin-labelled cDNA probes were prepared from ∼ 0.56 kb, ∼1.2 kb, ∼ 2.5 kb, and ∼ 3.25 kb overlapping clones representing the 3′-terminus of the PVYN genome. It was shown that the probe sizes, as determined by alkaline gel-electrophoresis, generally corresponded to the size of the template cDNA used. The sensitivity of detection of PVYN was maximum using the largest probe and the sensitivity generally decreased with a decrease in probe size. Five pg of homologous purified PVYN RNA was detected with the ~ 3.25 kb probe, and 1000 pg of PVYN RNA was required for the ~ 0.56 kb probe. The different levels of sensitivity of detection were also apparent when crude nucleic acid extracts from PVYN and PVYO infected plants were used. In comparison with tobacco bioassay, and dot immunobinding assay nucleic acid hybridization was found to be more sensitive.

Original languageEnglish (US)
Pages (from-to)197-210
Number of pages14
JournalJournal of Virological Methods
Issue number1-3
StatePublished - Dec 1994


  • DIG-labelled cDNA probe
  • Dot-immunobinding assay
  • Nucleic acid hybridization
  • PVY
  • PVY

ASJC Scopus subject areas

  • Virology


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