Cryopreservation of the model alga Ectocarpus (Phaeophyceae)

Area of Science:

• Marine Botany
• Phycology
• Algal Biotechnology

Background:

• Ectocarpus is a pivotal multicellular algal model organism, notable as the first fully sequenced of its kind.
• The increasing number of Ectocarpus strains and mutants necessitates efficient and cost-effective long-term preservation methods.

Purpose of the Study:

• To evaluate cryopreservation as a viable technique for the long-term maintenance of Ectocarpus strains.
• To establish a simple and effective cryopreservation protocol for this important algal model.

Main Methods:

• A two-step cryopreservation protocol was developed utilizing a combination of dimethyl sulfoxide (DMSO) at 10% (v/v) and sorbitol at 9% (w/v) as cryoprotectants.
• The robustness of Ectocarpus strains was assessed by testing post-cryopreservation recovery rates across multiple isolates.

Main Results:

• Cryopreservation proved to be a highly effective method, with successful recovery observed in all tested Ectocarpus strains.
• Regeneration of cultures was achieved through both the germination of cryopreserved zooids (spores) and the recovery of vegetative cells.
• Vegetative cells demonstrated remarkable resilience, with surviving cells capable of regenerating phenotypically normal thalloidal structures.

Conclusions:

• Cryopreservation is a reliable, cost-effective, and attractive option for the long-term maintenance of Ectocarpus strains.
• The robustness of Ectocarpus to cryopreservation ensures its continued utility as a model organism for research.
• This protocol facilitates the preservation of diverse Ectocarpus strains, including mutants, supporting ongoing research and development.