Abstract
This article reports the cryopreservation of apical meristems of Chlorophytum borivilianum, a tropical and IUCN critically endangered species. Initially, in vitro cultured shoots were pre-adapted on 12% (w/v) sucrose for 2-months and were found appropriate stock material for further experimentations. Furthermore, the preculture of meristems excised from pre-adapted in vitro shoots on 12% (w/v) sucrose containing MS medium with 50 mg/l abscisic acid for 48 h, followed by treatment with loading solution (LS), and plant vitrification solution (PVS2) was found crucial for recovery following cryostorage. Thereafter, durations of exposure to the LS and PVS2 were optimized to enhance the regeneration efficiency of apical meristems. Treatment with LS for 20 min followed by 30 min exposure to PVS2 was standardized for the vitrification of the apical meristems before plunging them into liquid nitrogen. Moreover, after cryoexposure thawing was performed for 1 min at 38 °C ± 2 in a water-bath followed by the treatment with unloading solution for 10 min resulted in enhanced recovery up to 33% on 2 mg/l 6-benzyladenine (BA) and 0.2 mg/l α-naphthalene acetic acid containing MS medium.
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Significance Statement: For the cryopreservation of Chlorophytum borivilianum abscisic acid was found crucial that helps in freeze tolerance. Moreover, the exposure times to cryoprotectants were optimized which minimizes the toxicity and helps in regeneration of meristems.
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Chauhan, R., Singh, V., Keshavkant, S. et al. Vitrification-Based Cryopreservation of In Vitro-Grown Apical Meristems of Chlorophytum borivilianum Sant et Fernand: A Critically Endangered Species. Proc. Natl. Acad. Sci., India, Sect. B Biol. Sci. 91, 471–476 (2021). https://doi.org/10.1007/s40011-021-01260-z
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DOI: https://doi.org/10.1007/s40011-021-01260-z