Journal
SCIENTIA HORTICULTURAE
Volume 139, Issue -, Pages 46-52Publisher
ELSEVIER
DOI: 10.1016/j.scienta.2012.01.011
Keywords
Conservation; Ex vitro rooting; Micropropagation; Orchid; Sustainable utilization; Tuber
Categories
Funding
- Department of Biotechnology (DBT)
- Department of Science and Technology (DST)
- University Grants Commission (UGC), New Delhi
- Council of Scientific & Industrial Research (CSIR), New Delhi
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An in vitro propagation and tuberization method was successfully established for Eulophia nuda Lindl., an endangered orchid of Aravalli hills. Shoot buds were induced from tuber explants (1 cm cut pieces) on Murashige and Skoog (MS) medium containing 444 mu M 6-benzyladenine (BA) and additives (283.8 mu M ascorbic acid, 67.8 mu M adenine sulphate, 143.5 mu M arginine and 118.9 mu M citric acid). After excision of newly formed shoots, explants were successively transferred to MS medium with 22.2 p,M BA and additives for shoot multiplication up to three passages. Further shoot multiplication and tuberization was achieved, by subculturing of in vitro-formed shoots, on MS medium containing 8.88 mu M BA, 4.68 mu M Kinetin (Kn) and additives. Shoot multiplication was influenced by cytokinin type, concentration and combinations. Shoots with tubers were successfully rooted in vitro and ex vitro. Shoots were treated with 2.46 mM indole-3-butyric acid (IBA) for 4 min for ex vitro rooting. Plantlets were acclimatized in the greenhouse conditions in bottles containing soilrite. Acclimatized plantlets were transferred to the earthen pots containing soil as a mixture of clay, sand and vermicompost (1:1:1). In vitro tuber formation of E. nuda was high compared to the ex vitro/natural conditions. This is the first report for in vitro propagation and tuberization of E. nuda. The protocol developed can be utilized for both large scale plant production and conservation of germplasm of this species. (C) 2012 Elsevier B.V. All rights reserved.
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