Abstract
Genetic variation of cultivated tomato can be enhanced by induced mutagenesis. Multivariate analysis based on 10 important fruit yield components grouped 21 tomato genotypes into 10 clusters indicating the presence of ample diversity among the genotypes. The genotypes Alisa Craig Aft and CLN-B showed best performance. Seven doses of gamma radiation was employed by imposing 100 Gy–700 Gy radiation with 100 Gy interval to the dry seeds of 5 diverse genotypes selected from different clusters which included the best performers Alisa Craig Aft, CLN-B, two wild relatives Solanum pimpinellifolium L., Solanum lycopersicum var. cerasiformae (Dunal) Spooner and an induced mutant Pmut-5. Seedling emergence and shoot length of these genotypes were recorded to determine the median lethal dose (LD50) and median growth reduction dose (GR50). Probit analysis suggested linear decrease in seed germination and shoot length with the increase in the dose of gamma irradiation for all the five genotypes. The LD50 and GR50 values varied widely among the genotypes, being very high for the wild relatives S. lycopersicum var. cerasiformae (298 Gy and 300 Gy) and S. pimpinellifolium (288 Gy and 295 Gy) followed by 240 Gy 251 Gy for Pmut-5, 179 Gy and 186 Gy for Alisa Craig Aft and 173 Gy 182 Gy for CLN-B. The study suggested the optimum gamma radiation dose ranged between 150 and 300 Gy. This optimum dose can be used to induce a higher rate of effective mutation creating maximum favorable genetic diversity with little biological damage in M2 and succeeding generations of tomato.
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Acknowledgements
We thank the Regional Nuclear Agricultural Research Centre (RNARC), Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, West Bengal, India, for letting us use the facility for this investigation.
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All authors contributed significantly towards the final make-up of the paper.
Conceptualisation (PH and SH); Data curation (SH and SB); Formal analysis (SG and SB); Investigation and methodology (SH and SG); Supervision (PH and AC); Writing-original draft (SH and PH); Writing-reviewing and editing (AM and AC).
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Hazra, S., Gorai, S., Bhattacharya, S. et al. Radio-sensitivity of diverse tomato genotypes with respect to optimization of gamma irradiation dose. Braz. J. Bot 45, 917–927 (2022). https://doi.org/10.1007/s40415-022-00823-2
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DOI: https://doi.org/10.1007/s40415-022-00823-2