Abstract:
Aim:
Methodology:
Results:
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Key words:
Effect of gamma irradiation on genomic disorder in sesame are scanty. The present study was
undertaken to evaluate the mutagenic effects of gamma rays on different parameters in two popular cultivars
of sesame, Roma and Tilottama.
Seeds of these two cultivars were irradiated with five doses of gamma rays: (250, 300, 350,
400, and 450 Gy) at BARC, Trombay and were sown (along with the un-irradiated control) during March
2015 in a split plot design with 3 replications keeping row to row and plant to plant distance at 30 cm and 10
cm, respectively to determine mutagen sensitivity with regard to pollen fertility (%), germination (%) and
seedling height (cm), root-shoot length (cm), plant survival (%) at maturity in M generation. To study 1
mutability, four to five capsules from each M plants in all the treatments were collected separately to give rise 1
the M generation. Individual plant progeny rows were sown in M during March 2016. ID was determined by 2 2 50
probit analysis for germination, shoot-root length and plant survival. Since the dose requirement for pollen
fertility is very high, ID was calculated instead of ID value. 30 50
It was observed that with
increasing doses of gamma rays, the
response of all characters decreased
significantly and followed a linear
relationship in both varieties. The root
system was more profound to gamma rays
than the shoot. Chlorophyll mutations
showed independent response to different
doses of gamma rays as they occurred in
random. The mutability of genotype Roma
induced with different doses of gamma
rays was higher than that of Tilottama.ue to saturation in the
mutational actions, response of characters
decreased with increase in gamma ray
doses but magnitudes of effect differed
between genotypes. The cultivar Tilottama
was found to be more sensitive than
Roma.
