Droplet-vitrification of Aranda Broga Blue orchid: Role of ascorbic acid on the antioxidant system and genetic fidelity assessments via RAPD and SCoT markers

Biotechnol Rep (Amst). 2020 Apr 21:26:e00448. doi: 10.1016/j.btre.2020.e00448. eCollection 2020 Jun.

Abstract

A droplet-vitrification cryopreservation protocol has been successfully developed for Aranda Broga Blue orchid hybrid using protocorm-like bodies (PLBs). However, maximum growth regeneration percentage was recorded at 5% only based on previous report. Thus, to improve growth recovery of cryopreserved PLBs, cryopreservation stages were supplemented with ascorbic acid, tested at 50, 100 and 150 mg/L. However, results demonstrated that exogenous ascorbic acid was not favorable in regeneration of cryopreserved explants (maximum value of 1.67 % with 50 mg/L ascorbic acid supplementation). Total soluble protein and various antioxidant enzyme activities such as catalase (CAT), superoxide dismutase (SOD) and ascorbate peroxidase (APX) were evaluated after each cryopreservation stages in conjunction with the application of exogenous ascorbic acid. Addition of antioxidant must be carefully evaluated and its application may not guarantee successful growth recovery. RAPD and SCoT molecular analysis confirmed the genetic stability of regenerated cryopreserved PLBs as no polymorphism was detected compared to control PLBs culture.

Keywords: APX, Ascorbate peroxidase; Antioxidant enzymes; Aranda Broga Blue orchid; CAT, Catalase; Cryopreservation; Fe, Na-EDTA Ethylenediaminetetraacetic acid, Ferric Sodium; Genetic fidelity; LN, Liquid Nitrogen; Molecular markers; PLB, Protocorm-like body; RAPD, Random Amplified Polymorphic DNA; SCoT, Start Codon Targeted; SOD, Superoxide Dismutase.