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- W2140622162 abstract "The use of cryoprotectants and slow cooling rates are routine procedures for the cryopreservation of plant cell lines. However, our results with rice (Oryza sativa L., cv. Taipei 309) show that calli can be cryopreserved by direct immersion and stored in liquid nitrogen without any cryoprotection. The efficiency of recovery using this method, as well as a conventional method was generally increased with a previous abscisic acid (ABA) treatment. Following cryopreservation, calli demonstrated some differences with respect to unfrozen calli of the same lines. Thus, resistance to freezing stress (−20°C for 2 h) increased significantly in all lines tested, irrespective of their pre-incubation with ABA. Calli that had been directly stored in liquid nitrogen also demonstrated a higher competence for genetic transformation than their unfrozen counterparts, as indicated by the transient gene expression levels obtained after particle bombardment. These differences might lead to further biotechnological applications. A genetic analysis of amplified DNA polymorphisms was performed with three independent lines that had been subjected to four combinations of ABA treatment and direct immersion in liquid nitrogen. At the loci screened with the randomly amplified polymorphic DNA (RAPD) markers tested, the genetic variations among lines and among calli of the same line akppear to be more related to tissue-culture-induced somaclonal variation than to cryoselection." @default.
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- W2140622162 date "1999-03-01" @default.
- W2140622162 modified "2023-10-10" @default.
- W2140622162 title "Physiological and genomic variations in rice cells recovered from direct immersion and storage in liquid nitrogen" @default.
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- W2140622162 doi "https://doi.org/10.1034/j.1399-3054.1999.105308.x" @default.
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