期刊
PLANT CELL TISSUE AND ORGAN CULTURE
卷 76, 期 2, 页码 179-182出版社
KLUWER ACADEMIC PUBL
DOI: 10.1023/B:TICU.0000007283.28280.a3
关键词
ammonium nitrate; cryopreservation; encapsulation-dehydration; medicinal plants
Shoot tip cryopreservation of Holostemma annulare, an endangered medicinal plant was carried out using Murashige-Skoog (MS) medium containing mM NH4++NO3-; 20.6+39.4 (MS-1), 2.6+18.8 (MS-2) or 0.0+18.8 (MS-3). The three media combinations were tested during four preparative procedures viz.: development of cultures; preconditioning of shoot tip cuttings; preculture of encapsulated shoot tips; and post-freeze recovery to understand the most critical phase of NH4NO3 sensitivity. MS-1 used during the initial three preparative steps supported 10.9-16.6% post-freeze recovery of cryopreserved shoot tips. Development of culture in MS-1 and subsequent passages (2nd, 3rd and 4th preparative steps) in MS-2 or MS-3 improved the recovery rate to 26.4-35.8%. MS-3 used throughout the steps favoured 38.5% recovery. Shoot tips from shoot cultures raised in MS-2 upon preconditioning in MS-2 or MS-3 and subsequent preculture of encapsulated shoot tips and post-freeze recovery culture in MS-3 showed maximum regeneration (55%). MS-2 used throughout the procedure supported 48% regeneration of cryopreserved shoot tips.
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