Cryopreservation of garlic shoot tips by vitrification: effects of dehydration, rewarming, unloading and regrowth conditions.
This paper investigates the effect of dehydration, rewarming, unloading and regrowth conditions and of bulb post-harvest storage duration on survival and regeneration of cryopreserved garlic shoot tips. PVS3 was the most effective of the seven vitrification solutions compared. Treating shoot tips with PVS3 for 150-180 min ensured 92 % regeneration after freezing. An air-drying treatment, performed either before or after the PVS3 treatment, was detrimental to regeneration of cryopreserved shoot tips. Rapid rewarming in a water-bath at 37 degree C gave higher regeneration than the slower rewarming procedures employed. Regeneration was similar using either sucrose or sorbitol unloading solutions. The growth regulator content of the recovery medium did not influence percentage regeneration. However, the fresh weight of explants cultured on medium containing 0.3 mg/L zeatin and 0.3 mg/L gibberellic acid was significantly higher than on other media. Post-harvest storage duration of bulbs dramatically influenced survival and regeneration of non-cryopreserved and cryopreserved shoot tips, which were nil for samples cryopreserved immediately after harvest and highest after 3 and 6 months of storage. The optimized cryopreservation protocol was applied to ten different garlic varieties, with regeneration percentages ranging between 72 and 95 %.
Kim
Haeng-Hoon
HH
National Institute of Agricultural Biotechnology, RDA, Suwon 441-707, Korea.
Cho
Eun-Gi
EG
Baek
Hyung-Jin
HJ
Kim
Chang-Yung
CY
Joachim Keller
E R
ER
Engelmann
Florent
F
D002470:Cell Survival / Q000187:drug effects / Q000502:physiology; D015925:Cryopreservation / Q000379:methods*; D003451:Cryoprotective Agents / Q000494:pharmacology; D003890:Desiccation / Q000379:methods; D005737:Garlic / Q000166:cytology / Q000187:drug effects / Q000502:physiology*; D018520:Plant Shoots / Q000166:cytology / Q000187:drug effects / Q000502:physiology*; D012038:Regeneration / Q000187:drug effects / Q000502:physiology; D017694:Rewarming / Q000379:methods
D003451:Cryoprotective Agents