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High and Low Throughput Screens with Root-knot Nematodes Meloidogyne spp.

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Efficient Procedure for Extracting Tylenchulus semipenetrans from Citrus Roots.

N Greco, T D'Addabbo

Journal of Nematology

|March 17, 2009

Summary

Colloidal silica centrifugation is effective for extracting citrus nematode (Tylenchulus semipenetrans) females. Other methods like incubation and sodium hypochlorite also efficiently recover different life stages of this plant-parasitic nematode.

Keywords:

Citrus aurantium Tylenchulus semipenetrans citrus nematode extraction method sour orange

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Area of Science:

Plant Nematology
Agricultural Entomology
Plant Pathology

Background:

Tylenchulus semipenetrans, the citrus nematode, causes significant damage to citrus worldwide.
Accurate quantification of nematode populations in citrus roots is crucial for effective management strategies.
Various extraction methods exist, but their efficiency for different life stages and extraction media varies.

Purpose of the Study:

To evaluate the efficacy of different solutions (sucrose, magnesium sulphate, colloidal silica) and methods (incubation, sodium hypochlorite, centrifugation, maceration) for Tylenchulus semipenetrans extraction from citrus roots.
To compare the recovery rates of different life stages (females, eggs, juveniles, males) using these techniques.

Main Methods:

Extraction of Tylenchulus semipenetrans from citrus roots using sucrose and magnesium sulphate solutions, and colloidal silica suspension with centrifugation.
Comparative analysis of incubation, sodium hypochlorite, centrifugation, and maceration-sieving methods.
Assessment of recovery efficiency for different nematode life stages.

Main Results:

Centrifugation with colloidal silica yielded higher numbers of Tylenchulus semipenetrans females compared to sucrose or magnesium sulphate solutions.
Incubation, sodium hypochlorite, and centrifugation methods were effective for recovering eggs, second-stage juveniles, and males.
The maceration-sieving method showed lower efficiency for overall nematode recovery.

Conclusions:

Colloidal silica centrifugation is a superior method for extracting Tylenchulus semipenetrans females from citrus roots.
A combination of sodium hypochlorite treatment with short maceration and colloidal silica centrifugation may reduce female recovery.
Multiple methods may be required for comprehensive assessment of all Tylenchulus semipenetrans life stages in citrus root samples.