Articles by Author: Ron L Van Der Watt

Search results for Ron L Van Der Watt

We found 56 results for you
  1. Somatic Embryogenesis in <em>Eucalyptus grandis</em>

    Item type: Journal Article • Journal: South African Forestry Journal
    Culture conditions for the in vitro propagation of Eucalyptus grandis via somatic embryogenesis were investigated. Induction and maturation of somatic embryos, production of plantlets and hardening-off procedures are detailed.
  2. An Investigation into the Development of Chloroplast Isolation and “In-Organelle” Digestion Procedures for the Routine Production of Chloroplast DNA Fingerprints of <em>Eucalyptus</em> species

    Item type: Journal Article • Journal: South African Forestry Journal
    The technique of “in-organelle” DNA digestion was assessed with regard to its applicability to the production of eucalypt chloroplast DNA (cpDNA) restriction fragments. Because of the waxy cuticle, high incidence of thickened tissue and presence of phenolic compounds in eucalypt...
  3. Establishment of Cell Suspension Cultures of <em>Eucalyptus grandis</em> and <em>E. grandis x camaldulensis</em>

    Item type: Journal Article • Journal: South African Forestry Journal
    A protocol was devised for the induction and maintenance of cell suspension cultures of Eucalyptus grandis. This involved the microscopical categorisation of the various regions within heterogenous callus masses, the assessment of competence of each callus type in a liquid...
  4. Towards a Protocol for the Micropropagation of <em>Pinus patula</em>

    Item type: Journal Article • Journal: South African Forestry Journal
    In this investigation, different approaches to the micropropagation of P. patula were attempted and assessed in order to identify the most promising one for commercial application. Of the regenerative routes investigated, viz. axillary bud proliferation (dwarf shoot formation) from juvenile...
  5. Field Performance of Micropropagated and Macropropagated <em>Eucalyptus</em> Hybrids

    Item type: Journal Article • Journal: South African Forestry Journal
    Plantlets derived, via both in vitro micropropagation and from rooted cuttings, from seven different Eucalyptus hybrid genotypes were assessed for their field performance in Kwambonambi, KwaZulu Natal. Tree survival, height, mean annual increment, diameter at breast height and size uniformity...
  6. Effect of Anti-Fungal Agents on <em>In Vitro</em> Cultures of <em>Eucalyptus grandis</em>

    Item type: Journal Article • Journal: South African Forestry Journal
    Young, small shoot explants of E. grandis were multiplied in the presence of 0,5 and 1 g/ℓ benomyl, 0,25 and 0,5 g/ℓ chlorothalonil, 0,36 and 0,72 g/ℓ propamocarb hydrochloride and 0,002 5 g/ℓ Amphotericin B. The multiplied shoots were then...
  7. <em>In vitro</em> regeneration of <em>Digitaria eriantha</em>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Embryogenic callus was obtained from immature regions of the leaf of Digitaria eriantha when grown in the dark on a MS medium supplemented with 1,0 or 2,0mg/dm3, 2,4‐D and 3–9 % sucrose. Plantlet regeneration occurred when the calli were transferred...
  8. Die oplosbaarheid en mobiliteit van kalk in sand

    Die oplosbaarheid en mobiliteit van kalk in sand

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Die oplosbaarheid, diffusie en loging van twee kalktipes is in 'n suiwer sandmedium bestudeer. Deur van sand gebruik te maak is die kompliserende effek van die uitruilfase van grond geëlimineer. Die uitwerking van byvoegings van KCl, NH4Cl, Na2EDTA, organiese materiaal...