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Two applications of cryogenic protocols are cryotherapy and cryopreservation for virus cleaning and germplasm storage. They are based on exposing explants to ultra-low temperature (−196°C) in liquid nitrogen. Ultra-low temperature in cryogenics implies abiotic stress, leading to the production of reactive oxygen species (ROS), which are the main reason for the low survival and death of explants. Hydrogen peroxide (H 2 O 2 ) is an important ROS produced by stress. Enzymatic antioxidants like catalase (CAT) and peroxidase (POX) are essential for avoiding damage due to H 2 O 2 , which is a primary signal against stress. Salicylic acid (SA) is involved in tolerance to stress-like cryogeny. Information about the relationship between SA-cryogeny-antioxidant enzymatic activity is scarce. The objective was to evaluate the induction of cryogeny tolerance by SA associated with antioxidant activities like CAT, POX, and H 2 O 2  and proline accumulation in tissue, during cryogenic protocols in two clones of potato ( Solanum tuberosum  L.). SA-induced cryogenic tolerance in both clones, mediated by reducing CAT enzymatic activity, higher H 2 O 2  content, proline accumulation and higher water potential before cryogeny. Enhanced CAT and POX activities after cryogeny were related to decreased H 2 O 2  content and higher survival. Results suggest the signalling role of H 2 O 2  in the induction of tolerance to cryogenic stress.

the journal of horticultural science and biotechnology

Induction of tolerance to cryogenic protocols in  Solanum tuberosum  by salicylic acid is mediated by enzymatic antioxidant activity and hydrogen peroxide