Abstract

DIAZ NARVAEZ, Lucía Candelaria; CARMONA WILCHES, Oscar Elías  and  BELTRAN HERRERA, Javier Darío. Optimization of in vitro conservation of Dioscorea spp germplasm by minimal growth. Rev. colomb. biotecnol [online]. 2015, vol.17, n.1, pp.32-39.  Epub July 08, 2021. ISSN 0123-3475.  https://doi.org/10.15446/rev.colomb.biote.v17n1..

Dioscorea alata cv. "Criollo" and Dioscorea rotundata cv. "Espino" are constituted as the two cultivars mostly cultivated in the department of Sucre, Colombia. For this reason the University of Sucre has been implementing tissue culture techniques for their multiplication throughout in vitro propagation. However, this methodology support accessions for a period about 4 months, causing continuous subcultures, increased costs and labor. Therefore the objective of the present investigation was to establish an optimal culture media for in vitro minimal growth conservation of different accessions (D. alata and D. rotundata) from the University of Sucre yam's genebank , for a period of 8 months by modifying the basic MS culture medium. The following osmolytes were used: sucrose, mannitol and sorbitol in different percentages (S:M:S). Eight treatments (T) in the following percentages were evaluated: T1 (control) (3:0:0), T2 (0:1,5:0), T3(0:0:2), T4 (0:1,5:2), T5 (0:0:1) y T6 (0:0:3), T7 (0:1,5:1) y T8 (0:1,5:3). Every 30 days data was recorded for: survival (%), expanded leaves (%), length of stem and roots, number of leaves and roots, phenolization (%), leaf senescence (%) and callus presence (%). The best results for D. alata and D. rotundata, were observed in treatment T4 (0:1,5:2), where a high percentage of survival evidence, a minimum percentage of leaf senescence and a limited response for the other variables. Therefore, these results indicate the potential of this media, to increase 100% in vitro growth conservation over the conventional media, and ensuring the viability and normal development of the accessions for more than four months period.

Keywords : yam; mannitol; sorbitol; sucrose.

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