Xylella fastidiosa: Host Range and Advance in Molecular Identification Techniques

Area of Science:

• Plant Pathology
• Microbiology
• Molecular Biology

Background:

• Xylella fastidiosa is a Gram-negative bacterium causing significant plant diseases globally.
• The pathogen's asymptomatic long-term carriage in hosts and recent spread in Europe necessitate rapid detection methods.
• Traditional methods like ELISA lack sufficient sensitivity for early-stage Xylella fastidiosa detection.

Purpose of the Study:

• To review and illustrate the application of various Polymerase Chain Reaction (PCR)-based methods for Xylella fastidiosa detection and identification.
• To provide researchers with a concise and useful tool for studying Xylella fastidiosa using DNA-based techniques.

Main Methods:

• Review of classical PCR, random amplified polymorphic DNA (RAPD), quantitative real-time PCR (qRT-PCR), nested-PCR (N-PCR), immunocapture PCR (IC-PCR), short sequence repeats (SSRs/VNTR), single nucleotide polymorphisms (SNPs), and multilocus sequence typing (MLST).
• Analysis of specific target amplification and sequencing.
• Listing of specific primers designed for different PCR-based methods.

Main Results:

• PCR-based methods offer powerful tools for sensitive and specific detection of Xylella fastidiosa.
• DNA-based classification of Xylella fastidiosa has advanced rapidly, with several subspecies identified (fastidiosa, multiplex, pauca, sandyi, tashke, and proposed morus).
• Various PCR techniques enable early identification and classification of Xylella fastidiosa, aiding in disease management.

Conclusions:

• PCR-based molecular techniques are essential for the accurate and timely detection of Xylella fastidiosa.
• Continued development and application of these methods are vital for controlling the spread of this economically important plant pathogen.
• This review serves as a valuable resource for researchers in the field of Xylella fastidiosa diagnostics.