EN
The use of flower tissue for the in vitro propagation of chrysanthemum (Chrysanthemum 9 grandiflorum (Ramat.) Kitam.), an ornamental plant, provides a specific and precious explant type for organogenesis (regeneration of adventitious shoots/roots) or somatic embryogenesis. This is of great importance for the breeding of this species. In vitro culture of flower tissue can lead to the separation of chimera components to obtain stable mutants. Moreover, regenerants derived from ray (ligulate) or disc (tubular) florets may present somaclonal variation. The ability to then regenerate such plant material can result in the production of plants with novel flower colour, modified architecture or other positive attributes, even more so after the application of physical mutagens such as gamma radiation. Although in vitro flowering is a rare phenomenon in chrysanthemum, the notion that it could be possible would allow for the formation of flower material that could serve as in vitro-disinfected material without the need to introduce explants, and possible contamination, from the ex vivo milieu. Regeneration protocols from flower tissue would allow for breeding using such tissues to be advanced while the process of in vitro flowering could also be better understood. This review provides an up-todate understanding of what is known in this field of research.