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Tissue position, explant orientation and naphthaleneacetic acid (NAA) affect initiation of somatic embryos and callus proliferation in Norway spruce (Picea abies)

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Abstract

Sections from mature zygotic embryos of Norway spruce exhibited different capacities for somatic embryo initiation. The upper hypocotyl part (Zone 2) was the most embryogenic, followed by the lower hypocotyl (Zone 3) and the apical zone (Zone 1); the root part (Zone 4) never initiated embryonal-suspensor masses (ESM). The embryogenic capacity of mature zygotic embryo is narrowly located in the vicinity of Zone 2. The frequency of embryos differentiating simultaneously ESM on Zones 1 and 3 is very low (0.6%) compared to those initiating ESM on Zones 1 and 2 (7%) or Zones 2 and 3 (16%). Elevated concentrations of naphthalene acetic acid (40 and 80 μM) reduced ESM initiation and callus proliferation on all sections but Zone 1. Highest initiation rate was obtained when explants were cultured with an apical-end-up orientation. Placing the explant basal-end-up partially inhibited the expression of embryogenic capacity, as well as decreasing the callus proliferation on Zone 3. A weak positive correlation (r=0.19, p < 0.001) was found between embryogenic capacity of the explant and proliferation rate of the derived callus.

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Authors and Affiliations

  1. Research Centre for Plant Growth and Development, University of Natal-Pietermaritzburg (UNP), Private Bag X01, Scottsville, 3209, South Africa

    A.V. Ramarosandratana & J. Van Staden

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  1. A.V. Ramarosandratana
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  2. J. Van Staden
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Correspondence to J. Van Staden.

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Ramarosandratana, A., Van Staden, J. Tissue position, explant orientation and naphthaleneacetic acid (NAA) affect initiation of somatic embryos and callus proliferation in Norway spruce (Picea abies). Plant Cell, Tissue and Organ Culture 74, 249–255 (2003). https://doi.org/10.1023/A:1024022226381

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