Mutation induction was used with the objective of obtaining mutants fo
r flower colour of chrysanthemum, cv. Repin (pink colour). Rooted cutt
ings were irradiated with 20 Gy of gamma rays and before the selection
the cutting back method was used to advance the generations. The freq
uency of colour mutants observed was 5.8%. Among the mutants obtained
the white and dark-pink-coloured ones were evaluated in yield trial an
d post-harvest. The results indicated that these mutants mantained the
same agronomical characteristics showed by the control, with the exce
ption of plant height in the white mutant that was shorter. Due to com
mercial interest of the producers, these mutants were multiplied and r
eleased as new cultivars. The white flower colour mutant was named Cri
stiane and the dark-pink, Ingrid. This was the first example of cultiv
ars from an ornamental plant released by mutation breeding in Brazil.