Influence of some plant growth regulators on the growth and organogenesis ofCymbidium aloifolium (L.) Sw. seed-derived rhizomesin vitro |
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Authors: | N. R. Nayak P. K. Chand S. P. Rath S. N. Patnaik |
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Affiliation: | (1) Laboratory of Cytogenetics, Post-Graduate Department of Botany, Utkal University, 751 004 Bhubaneswar, Orissa, India |
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Abstract: | Summary An efficient procedure is outlined forin vitro regeneration of an epiphytic orchid,Cymbidium aloifolium (L.) Sw. using rhizomes developed from seeds. Murashige and Skoog's (1962) medium (MS) containing indole-3-acetic acid (IAA), indole-3-butyric acid (IBA), or 1-naphthaleneacetic acid (NAA) stimulated growth and proliferation of rhizomes with NAA being most effective at 5.0 mg.l−1 (27.0 μM). Shoot bud differentiation was induced in the apical portions of the rhizomes on MS medium containing kinetin (Kn) or N6-benzyladenine (BA). The highest frequency of shoot regeneration (91.5%) and the maximum number of shoot buds formed (3.5 shoots/rhizome) were recorded with BA at 1.0 mg.l−1 (4.4 μM). NAA (0.1 mg.l−1, 0.54 μM), whenever added to the medium in conjunction with BA (1.0 mg.l−1, 4.4 μM), slightly enhanced the frequency of shoot bud regeneration (92.6%) and the number of shoot buds formed (5.2 shoots/rhizome). Moreover, an NAA-BA combination induced rooting in regenerated shoots thereby producing complete plantlets in one step. Shoots developed on cytokinin-supplemented medium were rooted on MS containing NAA at 1.0 mg.l−1 (5.4 μM). Regenerated plantlets were acclimated and eventually established in a garden. |
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Keywords: | Cymbidium aloifolium epithytic orchid organogenesis rhizomes |
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