Radiation with Gamma rays has been reported to give rise to a large number of novel mutants in several ornamental species (Chrysanthemums, orchids, rose, pelargonium, canna, and carnations). The present study was carried out to utilize the mutagenic effect of gamma rays on Zinnia elegans to obtain dwarf varieties and flowers with novel architecture and colours.

https://www.researchgate.net/figure/Effect-of-gamma-radiation-on-flower-colour-and-form-of-Zinnia-elegans-var-Dreamland-C_fig2_322244484