DNA-based method for rapid identification of the pine pathogen, Phytophthora pinifolia

Area of Science:

• Plant Pathology
• Microbial Genetics
• Forestry

Background:

• Phytophthora pinifolia causes 'Daño Foliar del Pino', a needle and shoot disease affecting Pinus radiata.
• Accurate identification of this new pathogen is crucial for research and quarantine, especially for non-experts.
• Current identification methods may not be efficient for processing large sample volumes.

Purpose of the Study:

• To develop species-specific primers for Phytophthora pinifolia.
• To establish a PCR-restriction fragment length polymorphism (PCR-RFLP) protocol for P. pinifolia identification.
• To enable accurate and efficient identification of P. pinifolia in large-scale studies.

Main Methods:

• Development of species-specific primers targeting the internal transcribed spacer (ITS) region and the Ypt1 gene.
• Testing primers against various Phytophthora species and fungi from Pinus radiata.
• Utilizing genus-specific Phytophthora primers for PCR-RFLP to create a species-specific profile.

Main Results:

• Developed primers specifically amplified only P. pinifolia across tested species.
• The PCR-RFLP protocol generated a unique profile for P. pinifolia.
• The PCR-RFLP method successfully differentiated P. pinifolia from 27 other Phytophthora species.

Conclusions:

• The developed species-specific primers and PCR-RFLP protocol provide accurate and efficient identification of Phytophthora pinifolia.
• These methods are valuable tools for quarantine efforts and biological research on this emerging pine pathogen.
• Facilitates large-scale sample processing for accurate pathogen detection and management.