ISHS Acta Horticulturae 586: IV International Symposium on Olive Growing
THE EFFECT OF ORTHOTROPIC AND PLAGIOTROPIC SHOOTS ON SEMI-HARD WOOD CUTTINGS RHIZOGENESIS OF SOME TUNISIAN OLIVE CULTIVARS |
| Author: | W. Khabou |
| Keywords: | olive tree, semi-hardwood cutting, growth promoter, plagiotropic and orthotropic shoot, proximal and distal cutting |
| DOI: | 10.17660/ActaHortic.2002.586.193 |
| Abstract:
Tunisian olive industry is characterized by the presence of a number of native varieties with diversified edaphic and climatic adaptation. Preservation of this precious germplasm would be facilitated if vegetative propagation by cuttings were generally applicable. To extend this type of propagation to as many genotypes as possible, attempts were made to improve the rooting ability of some recalcitrant varieties by using 11 different growth promoter combinations, denoted T1 to T11, which were compared with the untreated control T0,without hormones. Hormones were applied to proximal and distal cuttings with four or six apical leaves, collected from orthotropic or plagiotropic shoots. Cultivars under trial were Chemlali, Meski, Chemchali and Oueslati. Results showed that the rooting rate of all cuttings was influenced by factors such a selection of shoots (plagiotropic or orthotropic), position of the cuttings on the shoot, and combination of growth promoter. In particular: (i) cv. Chemlali. The best rooting rate (60%) was obtained with proximal cuttings containing four leaves, collected from plagiotropic shoot and treated with T5 (IBA 2000 ppm). Distal cuttings with four or six leaves from orthotropic shoots and treated with T4 (IBA 2000+NAA500+IAA500ppm) showed a rooting rate of 40%; (ii) cv.Meski. The best rooting rate (80% and 60%)was shown by orthotropic cuttings with four leaves, treated respectively with T1(IBA4000 ppm), T2 (IBA 3000 + NAA 500+IAA500 ppm), T3 (IBA 2000+NAA1000 +IAA 1000 ppm) and T5 (IBA 2000 ppm). With the same cultivar, plagiotropic cuttings with four or six leaves gave a rooting rate of 82% with T6 (IBA 2000+NAA 500 ppm); (iii)cv.Chemchali registered the highest percentage of rooting (75%)when orthotropic cuttings with four leaves and plagiotropic cuttings with six leaves were treated with T5(IBA 2000 ppm); (iv) cuttings of cv. Oueslati yielded 73% rooting when they were selected from orthotropic shoots with four leaves , treated with T1(IBA 4000ppm) and T3 (IBA 2000+NAA 1000+IAA 1000ppm), or were from plagiotropic shoots with six leaves, treated with T4 (IBA 2000 + NAA500+IAA 500ppm) | |
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