Frequency of Morphological Mutations
In M2 generation, plants were
thoroughly examined for morphological
mutations in all mutagenic treated two varieties
of okra. The maximum frequency of viable
mutants was observed in GO-2 variety at 40
kR of gamma rays (11.19%) followed by 0.25%
EMS (6.75%) in the same variety. All the doses
of both the mutagens were effective to induce
viable mutations. High frequency of viable
mutants was observed at higher doses of
mutagens. In general, gamma irradiation
treatments seemed to be the most effective for
inducing the macromutations in both the
genotypes of okra (Table 1). Similar results were
reported in three okra varieties by Singh and
Singh (1998). In GO-2, highest mutation
frequency was found at treatment 40 kR
gamma irradiation (11.19%) followed by 0.25%
EMS (6.75%) and lowest at treatment 30 kR
gamma irradiation (2.92%), whereas in GJO-3
highest mutation frequency was found at
treatment 0.25% EMS (6.67%) followed by 30
kR gamma rays (6.64%) and lowest at treatment
20 kR gamma rays (3.65%).