Cryopreservation of Pratylenchys spp

Area of Science:

• Agricultural Science
• Nematology
• Cryobiology

Background:

• Root lesion nematodes (Pratylenchus spp.) are significant agricultural pests.
• Long-term storage of nematode germplasm is crucial for research and pest management.
• Current preservation methods may not ensure long-term viability and genetic integrity.

Purpose of the Study:

• To determine optimal cryopreservation conditions for root lesion nematodes.
• To evaluate the impact of glycerol concentration and incubation duration on nematode survival.
• To assess the viability and infectivity of cryopreserved nematodes.

Main Methods:

• Nematodes were pre-treated with varying concentrations of glycerol (14-17% w/w).
• Incubation periods in glycerol ranged up to 5 days before immersion in liquid nitrogen.
• Survival rates were assessed, and cryopreserved nematodes were tested for reproductive and infective capabilities using carrot disc cultures.

Main Results:

• Glycerol pre-treatments between 14-17% (w/w) were optimal for nematode survival.
• Extended incubation in glycerol, up to 5 days, significantly enhanced survival rates.
• The highest mean survival rate for Pratylenchus thornei was 76% after 5 days of incubation.
• Cryopreserved nematodes successfully reproduced and infected carrot disc cultures, indicating full viability.

Conclusions:

• Cryopreservation using optimized glycerol pre-treatment and incubation is effective for root lesion nematodes.
• This technique provides a reliable method for long-term germplasm storage.
• The ability to maintain genetic lines and viability has significant applications in agricultural research and pest management.