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The effects of 1-naphthaleneacetic acid and N6-benzyladenine on the growth of Cymbidium forrestii rhizomes in vitro

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Abstract

An Asiatic orchid, Cymbidium forrestii, was clonally propagated using seed-derived rhizomes as explants. The rhizomes were cultured and proliferated on Murashige and Skoog medium supplemented with various growth substances. Auxins stimulated rhizome growth by increasing branching and fresh weight of the explant, with 1-naphthaleneacetic acid (NAA) being the most effective auxin. All auxins tested suppressed normal shoot formation. The apical meristem of the rhizome reacted to exogenously applied auxin by reducing the cytoplasmic zone of the apical meristem and causing meristem derivatives to rapidly differentiate into vacuolated parenchyma cells. Leaf formation and development was retarded in the presence of auxin. Cytokinins generally reduced rhizome growth and the number of branches, but benzyladenine (BA) can induce shoot formation in vitro. BA induced the cytoplasmic zone of the apical meristem to enlarge and enhanced leaf development. A 5% (w/v) sucrose concentration was most effective in shoot induction when combined with 5 mg1-1 BA. Activated charcoal promoted rhizome growth; however, shoot formation was inhibited.

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Authors and Affiliations

  1. Department of Horticulture, Chungbuk National University, 360-763, Cheongju, Korea

    Kee Yoeup Paek

  2. Department of Biological Sciences, University of Calgary, T2N 1N4, Calgary, Alberta, Canada

    Edward C. Yeung

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  1. Kee Yoeup Paek
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  2. Edward C. Yeung
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Paek, K.Y., Yeung, E.C. The effects of 1-naphthaleneacetic acid and N6-benzyladenine on the growth of Cymbidium forrestii rhizomes in vitro. Plant Cell Tiss Organ Cult 24, 65–71 (1991). https://doi.org/10.1007/BF00039732

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  • DOI: https://doi.org/10.1007/BF00039732

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