Abstract
In order to improve forage characteristics of Italian ryegrass by genetic transformation, an efficient callus induction from mature seed and optimal plant regeneration system were established using a domestic cultivar 'Kospeed'. Addition of 5 mg/L of 2,4-D showed highest frequency of embryogenic callus induction from mature seeds. N6 medium showed higher frequency of both callus induction and plant regeneration as compared with MS and SH medium. The highest plant regeneration frequency 67% was obtained when embryogenic calli were transferred to N6 medium containing 1 mg/L 2,4-D and 5 mg/L BA. Supplementation of regeneration medium with sucrose at 30 g/L level maximized regeneration frequency as compared to the other concentrations. These data would be very helpful for molecular breeding of domestic Italian ryegrass cultivar through genetic transformation.
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