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| Titre: | Status of tissue culture date palms in Namibia |
| Auteur(s): | Ben Abdallah, A., FAO, Windhoek (Namibie)
De Wet, P.F., National Project director, Date Palm Support Programme, Windhoek (Namibia) |
| Date de publication: | 2005 |
| Résumé: | All the commercial cultivated date Palrns in Namibia derive from in vitro culture. Two main varieties (Barhee, Medjool) are present in the commercial plantations and it is envisaged that future expansion wiIl be based on these two varieties. In general it can be stated that the palms produce satisfactorily and the quality of the dates are such that Namibia has been successful in entering the export market with the main varieties. The presence of a large number of date palm vitro plants that are in production, coming from various laboratories, give Namibia a unique opportunity to analyse any variability which could be attributed to the in vitro cultivation process. The analysis of the variability due to in vitro culture was started recently and concentrates on the two principal varieties. The first analysis concerning the Barhee variety derive from somatic embryogenesis produced at the laboratory of Date PaIm Developrnent in the United Kingdom (DPD) and consists of 8 blocks with a total of 2700 palms. The following was noted and are subject to further study: • Variability noted on 4 aspects Big size of leaves, Problem of fruit set, Restrictive growth, Strange shape of the palm) • This variability is relatively small (3.2% only on the total of 2700 palms analyzed) • The economic impact is relatively small. • Variation to be subjected to further study to determine if it could be as a result of other factors (Physical factors such as soil, irrigation, hardening, management practices etc. as well as probable pest and disease effect on the palms) Our analysis in progress on the Barhee and Medjool varieties wiIl allow us, in the immediate future, to analyse and quantify the impact on production results. The origin of the vegetative material (laboratory, technique, genetic factor, physical factor or disease) influences the type of variability and initial results show the following: • variability seems to be strongly related to the conditions of regeneration of the vitro plants (Mother material, technical protocol, personnel capacity, laboratory conditions, etc) and to a lesser degree to the technique somatic embryogenesis or organogenesis) • Possible origins of variability observed could also be related to the following factors: - Epigenetic variability (Phenotype abnormal of the plant but normal fruits) Physical factors (different type of stress, environment, climate, ground, water, fecundation, receptivity of the female flowers, and viability of Pollen...) |
| Licence: | http://andzoa.ma/fr |
| URI/URL: | http://webagris.inra.org.ma/doc/ouvrages/truetype....
http://localhost:8080/dspace/handle/0/2868 |
| Collection(s) : | Fonds Documentaire
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