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High frequency plant regeneration from thin cell layer explants of Brassica napus

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Abstract

Explants composed of the epidermis and 4–9 layers of subepidermal cells were excised from internodes of Brassica napus L. ssp. oleifera cv. Westar and cultured on modified Murashige and Skoog (MS) medium. The three or four terminal internodes excised from plants at an early stage (before any flower buds had opened) were shown to be the best explant source. Both cytokinin and auxin were required for induction of shoot organogenesis. Of six auxins tested, only naphthaleneacetic acid (NAA) was effective in shoot bud initiation. All four cytokinins tested (when associated with 0.5 mgl-1 NAA) promoted organogenesis, but at differing frequencies. The highest shoot induction frequency was obtained at 10–15 mgl-1 benzyladenine (BA). The organogenic response was strongly affected by the nitrogen content of the medium. The best response was observed when NO3 - was the sole nitrogen source (supplied as KNO3) in the range 30–90 mM. Sucrose and glucose were equally supportive in shoot regeneration with the optimal levels at 0.12 M and 0.15 M, respectively. Shoots were rooted on medium free of growth regulators and mature plants were grown in the greenhouse. Plants were also recovered from leafy structures which differed morphologically and histologically from shoot buds.

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Authors and Affiliations

  1. Genetic Engineering Section, Ottawa Research Station, Agriculture Canada, K1A 0C6, Ottawa, Ontario, Canada

    K. Klimaszewska & W. A. Keller

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  1. K. Klimaszewska
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  2. W. A. Keller
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Klimaszewska, K., Keller, W.A. High frequency plant regeneration from thin cell layer explants of Brassica napus . Plant Cell Tiss Organ Cult 4, 183–197 (1985). https://doi.org/10.1007/BF00040193

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  • DOI: https://doi.org/10.1007/BF00040193

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