Reference : Axillary proliferation and tuberisation of Dioscorea cayenensis-D-rotundata complex
Scientific journals : Article
Life sciences : Phytobiology (plant sciences, forestry, mycology...)
Life sciences : Biotechnology
Axillary proliferation and tuberisation of Dioscorea cayenensis-D-rotundata complex
Ovono, Paul O [Université de Liège - ULg> > Sciences de la vie> > > Biologie moléculaire et biotechnologie végétales > >]
Kevers, Claire mailto [Université de Liège - ULg > Département des sciences de la vie > Biologie moléculaire et biotechnologie végétales >]
Dommes, Jacques mailto [Université de Liège - ULg > Département des sciences de la vie > Biologie moléculaire et biotechnologie végétales >]
Plant Cell, Tissue & Organ Culture
Yes (verified by ORBi)
[en] Cytokinin ; Dioscorea cayenensis-D ; rotundata ; Jasmonic acid ; Micropropagation ; Sucrose ; Yam
[en] Yams (Dioscorea spp) are tuber crops used as staple food in Africa because of their nutritional value. However agronomic constraints, phytosanitary problems and the lack of good healthy planting material restrict their production. In contrast to the inefficiency of traditional method of planting, tissue culture techniques allow to increase the multiplication and the rapid production of pathogen- free plant material. This work was undertaken to provide farmers in African countries with healthy microplants and microtubers as seeds. In vitro nodal segments of two varieties of local yams D. cayenensis-D. rotundata complex (cv.'Singo', cv. 'Singou' and cv. 'Gnidou') were micropropagated on the modified medium of Murashige and Skoog. The morphogenesis, the growth of microplants and microtuber formation have been found to be controlled by external factors that act individually and synergistically. Addition of kinetin (2 mg l(-1)) to the culture media could reduce multiplication rate (node number) of some clones. An increase of the sucrose concentration from 3% to 5% induced no change in the multiplication and tuberisation parameters. An important reduction of the multiplication (shoot number, height and node number) and the tuberisation (tuber number and length) was observed with 8% sucrose. Multiplication (shoot and node number) was increased in the presence of jasmonic acid (10 mu M). JA also induced an increase of tuber number in the absence of Kin. Multiplication of yam by in vitro growth of nodal segments is a way for rapid clonal multiplication and could allow solving the problem of lack of seed material faced by farmers. This method could also be used for multiplication of elite cultivars, independently of the growing season.
Researchers ; Professionals

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