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Detection and quantification of Prymnesium parvum (Haptophyceae) by real-time PCR
L Galluzzi1, E Bertozzini, A Penna
1Center of Biotechnology, University of Urbino, Fano (PU), Italy. luca.galluzzi@uniurb.it
Aims:
The ichthyotoxic species Prymnesium parvum (Haptophyceae) is difficult to quantify in a microscopy-based monitoring programme, because the cells are very small, fragile and their morphology can be distorted by the use of fixatives. In the attempt to overcome these problems, a real-time PCR-based method for the rapid and sensitive identification and quantification of P. parvum was developed.
Methods And Results:
A quantitative real-time PCR assay was optimized with primers designed on the internal transcribed spacer 2 rDNA region of P. parvum. This PCR assay was specific, showing no amplification of DNA extracted from closely related species, and sensitive. Moreover, this method was able to detect and reliably quantify P. parvum cells in preserved environmental samples artificially spiked with known amounts of cultured cells.
Conclusions:
Considering the specificity, sensitivity and applicability to preserved environmental samples, this method may be a useful tool for the monitoring of this toxic species.
Significance And Impact Of The Study:
The real-time PCR method described in this study may represent a progress towards the rapid detection and quantification of P. parvum cells in water-monitoring programmes, allowing the early application of strategies to control bloom events, such as the use of clay minerals.
Insights
A new real-time PCR method accurately quantifies the toxic alga Prymnesium parvum. This approach overcomes microscopy limitations for effective water monitoring and early bloom control strategies.
Area of Science:
- Environmental Microbiology
- Molecular Biology
- Phycology
Background:
- Microscopy-based quantification of Prymnesium parvum is challenging due to small cell size, fragility, and morphological distortion from fixatives.
- Accurate monitoring of P. parvum is crucial for managing its ichthyotoxic blooms.
Purpose of the Study:
- To develop a rapid, sensitive, and reliable method for identifying and quantifying Prymnesium parvum.
- To overcome the limitations of traditional microscopy for P. parvum detection.
Main Methods:
- Quantitative real-time PCR (qPCR) assay development.
- Primer design targeting the internal transcribed spacer 2 (ITS2) rDNA region of P. parvum.
- Validation using preserved environmental samples spiked with known P. parvum cell concentrations.
Main Results:
- Optimized qPCR assay demonstrated high specificity, with no cross-amplification from related species.
- The assay proved sensitive for detecting and quantifying P. parvum.
- Reliable quantification was achieved in preserved environmental samples.
Conclusions:
- The developed real-time PCR method offers a valuable tool for monitoring toxic P. parvum.
- This advancement facilitates early detection and timely implementation of bloom control strategies.
- The method represents progress in rapid detection for water monitoring programs.
