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  • vegetative propagation  (1)
  • 1
    ISSN: 1572-9680
    Keywords: gum arabic tree ; Acacia senegal ; vegetative propagation ; cutting ; Senegal ; Africa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Resumé Des boutures de huit noeuds (12 à 14 cm de long) et de faible diamètre (inférieur à 0.4 cm) ont été prélevées au champ, sur des arbres adultes, à diverses périodes de l'année en vue d'étudier leurs taux d'enracinement, de formation de cals et de survie. La poudre de basalte concassée sur lit de gravier, avec un bon drainage, s'est révélée comme le meilleur substrat. Avec ce type de bouture, la présence de feuilles parait absolument indispensable pour obtenir un enracinement. Quatre feuilles sont suffisantes pour assurer le rôle trophique qui est probablement le leur. La néo-formation de racines n'est apparue que sur les boutures prélevées durant la saison des pluies. Sans traitement hormonal les boutures du type étudié n'ont donné aucun résultat. L'AIB-8% en poudre se révèle meilleurque l'AIB-2%, l'ANA-0.2% et l'AIA-1%. Avec l'AIB-8%, les taux d'enracinement vont de 50 à 70% si le substrat, l'hygrométrie,la présence de feuilles et la période de prélèvement sont convenables.
    Notes: Abstract In order to study and monitor rates of rooting, callusing and survival, small diameter stem cuttings (less than 0.4 cm) with eight nodes (12–14 cm long) were taken from trees in the field at different times of the year in tests with small batches of cuttings. Among the four tested substrates, well drained crushed basalt powder placed on a bed of gravel was the best rooting medium. Rooting was generally poor or even non-existent with this type of cutting, but the presence of leaves both promoted rooting and significantly (using Chi square test) improved survival of the cutting. Four leaves were sufficient to assure the necessary metabolic functions. Only stem cuttings collected during the rainy season gave roots and then, only when hormonal treatments were applied to the cuttings. 8%-IBA resulted in significantly better rooting than did 2%-IBA, 0.2%-NAA and 1%-IAA. With 8%-IBA, the rate of rooting varied between 50 and 70% for leafy cuttings collected in the rainy season. Hormonal treatments had a significant effect on the survival rate of the stem cuttings during the two months observation period. Further investigations are being conducted with different types of cuttings.
    Type of Medium: Electronic Resource
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