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Effect of different doses of gamma rays to induce flower mutants in spray chrysanthemum (Chrysanthemum morifolium Ramet.)

Author: Swathi, K., Tapas Mandal and Vijayalaxmi, M.

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Abstract

Three cultivars used for the study on effect of different doses of gamma rays exhibited their differential radio sensitivity. The survival percentage was decreased with increase in radiation dose from 0 to 20 Gy and no plants survived beyond 20 Gy. LD50 differed with the cultivars in which Bidhan Swapna is highly sensitive to gamma rays. Increase in radiation dose resulted in reduction of various growth parameters and delayed blooming. The doses of gamma rays (10, 15 and 20 Gy) used in the experiment are effective but the most efficient dose was 10 Gy for Bidhan Shova and BC-8-05 and 20 Gy for Bidhan Swapna because these doses generated maximum number of useful as well as viable mutants. Flower colour mutants in chimeric form was detected at 10 Gy in BC-8-05 and 20 Gy radiation dose gave solid colour mutants in Bidhan Swapna. Most of the floret shapes as well as changed flower colour and floret shape mutants were identified at 15 Gy and 20 Gy. The frequency of type V (floret shape) and type VI (flower colour) mutants was more in M1V1 and M1V2 generations respectively.

Keywords

Chrysanthemum, irradiation, mutant, survival percentage, flower colour, flower shape, solid mutant

Conclusion

In the present experiment 2-3 types of flower form mutants were isolated as solid mutants and some chimeric mutants which shows that the changes for flower colour and flower form are due to independent events and the pleiotropic effect is ruled out. Like mutation frequency, the spectrum of mutation also varied with cultivars and dose of gamma rays where pink coloured varieties have a tendency to produce solid mutants and yellow –bronze coloured varieties give raise to flower shape sports and chimeras.

References

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How to cite this article

Swathi, K., Tapas Mandal and Vijayalaxmi, M. (2021). Effect of different doses of gamma rays to induce flower mutants in spray chrysanthemum (Chrysanthemum morifolium Ramet.). Biological Forum – An International Journal, 13(1): 782-789.