ISHS Acta Horticulturae 424: II International Rose Symposium
GENETIC TRANSFORMATION OF ROSES, 2 EXAMPLES: ONE ON MORPHOGENESIS, THE OTHER ON ANTHOCYANIN BIOSYNTHETIC PATHWAY |
| Authors: | F. Souq, P. Coutos-Thevenot, H. Yean, G. Delbard, Y. Maziere, J.P. Barbe, M. Boulay |
| Abstract:
Cut flower roses are highly selected varieties which are vegetatively propagated (budding). Improve roses means mainly to act specifically on defined traits such as flower buds and flower qualities (shape and colour), stem length, vase life etc.., without changing the others. The ultimate aim being to create new clones (cultivars) with higher agronomical potential. To obtain such results through sexual crossing makes it necessary to have a good knowledge of traits inheritance, good parents and to make a lot of hand pollinated crossing and then to select among them the best one. Modern biology has developed new tools applicable for genetic improvement of selected traits, among them are somaclonal variation and genetic transformation. In order to be efficient, somaclonal variation needs a selective pressure which is not often available if one select for morphological traits or for flower production for example. On the other hand, genetic transformation is more widely applicable but it implies to have gene sequence(s) (promoter and gene) autologous or heterologous to the plant which is (are) susceptible to influence the trait(s) to be improved. Use of such a technology makes also necessary to be able to transform rose cells and to regenerate entire transformed plants from them (non chimaeric plants). The work, that has been done in our laboratory and in our greenhouses, shows that such techniques are now available for Hybrid tea roses at least for some cultivars. | |
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