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Multimeric non-radioactive cRNA probes improve detection of potato spindle tuber viroid (PSTVd)
R P Singh1, A Boucher, D K Lakshman
1Agriculture Canada, Research Branch, Fredericton, New Brunswick.
Journal of Virological Methods
|September 1, 1994
Summary
Digoxigenin-labeled complementary RNA (cRNA) probes significantly enhance potato spindle tuber viroid (PSTVd) detection sensitivity. This method offers a 2- to 30-fold improvement over cDNA probes, enabling earlier and more accurate diagnosis.
Area of Science:
- Molecular Biology
- Plant Pathology
- Virology
Background:
- Potato spindle tuber viroid (PSTVd) is a significant plant pathogen.
- Accurate and sensitive detection methods are crucial for managing PSTVd.
- Existing complementary DNA (cDNA) probes have limitations in sensitivity.
Purpose of the Study:
- To evaluate the sensitivity of digoxigenin (DIG)-labeled complementary RNA (cRNA) probes for PSTVd detection.
- To compare the efficacy of cRNA probes with cDNA probes.
- To determine the optimal substrate for enhanced detection.
Main Methods:
- Synthesis of multimeric DIG-labeled cRNA and cDNA probes.
- Hybridization assays using various alkaline phosphatase substrates (colorimetric and chemiluminescent).
- Testing detection limits in diluted potato leaf and tuber extracts.
Main Results:
- DIG-labeled cRNA probes improved PSTVd RNA detection sensitivity by 2- to 30-fold compared to cDNA probes.
- Chemiluminescent substrates, particularly Lumi-Phos 530, combined with hexameric cRNA probes, achieved detection of 0.48 pg PSTVd RNA.
- cRNA probes demonstrated a higher dilution endpoint (up to 16,384 times) than cDNA probes (1024-2048 times).
Conclusions:
- Multimeric DIG-labeled cRNA probes offer a significant advancement in PSTVd detection sensitivity.
- The choice of alkaline phosphatase substrate impacts detection efficiency.
- These enhanced probes provide a more sensitive tool for diagnosing PSTVd infections in potato plants.