Germination and development of M-1 seedlings of two Selliera radicans Cav. accessions subjected to gamma radiation

Selliera radicans is a creeping plant native to Chile, New Zealand and Australia. It is increasingly used in the ornamental industry, and there is interest in breeding it to create commercial varieties. The aim of this study was to determine the effects of different doses of gamma radiation applied to the seeds on the germination and development of seedlings (M-1) and the LD50 of two accessions of Selliera radicans for use in the induction of mutations. Seeds of the Vichuquen and La Serena accessions were exposed to 0, 100, 200, 300, 400, 500, 600 and 700 Gy from a Co-60 source. Weekly germination percentages along with seedling numbers and lengths were recorded. Vichuquen seeds were more sensitive to this physical agent. The LD50 was 243.9 Gy for Vichuquen and 445.6 Gy for La Serena. Seedling lengths reached almost 4 mm for Vichuquen and 11.3 mm for La Serena at 12 weeks after sowing. Doses lower than 200 Gy are recommended since higher doses do not allow the development of seedlings to the extended cotyledon stage.