In vitro effect of gamma irradiation and plant growth regulators (PGRs) for induction and development of Stylosanthes hamata cv. Verano

Abstract

Pasture legumes was developed by tissue culture technique using gamma irradiation. Seeds of Stylosanthes hamata cv. Verano were received 7 doses of radiation (5, 10, 15, 20, 25, 30 and 45 Krad) and control (without irradiation) cultured on MS medium. Free Plant Growth Regulators (PGRs) and 30 g/L sucrose treatment found that 30 Krad decreased the percentage of shoot and root length of 31.7% and 20.51% respectively in 30 days. While seeds without irradiation were 100% germination. The radiation doses was reduced the growth rate by half in 7 days GR 50 (3 0) at 39.82 Krad. The lethal dose (LD 50 ) of Stylosanthes hamata cv. Verano was 26.14 Krad and the higher irradiation level increased death rate. Seeds on MS medium with 3 mg/L of meta-Topolin (mT) resulted at 60 days after irradiation which higher than 50 % in all treatments. Moreover, every dose of gamma rays stimulated shoots and roots after 60 days.