Abstract
A procedure for plant regeneration from immature seed-derived calli of rugosa rose ( Rosa rugosa Thunb.) via somatic embryogenesis is described. Embryogenic calli were initiated from immature seeds 2–3 weeks after anthesis on Murashige and Skoog (MS) medium without growth regulators. Induced calli had a white, friable and nodular appearance with several proembryos. These calli were subcultured at 20-day intervals on MS medium containing 0.1–0.2 M galactose on which they grew rapidly; but somatic embryogenesis was inhibited. Somatic embryos were again induced from the subcultured calli after transferring to MS medium containing 0.1 M M fructose or sucrose but lacking growth regulators. After transferring these embryos (1–2 mm) to MS medium containing 0.1 M sorbitol, 3% of them germinated and grew into plantlets which showed sustained growth on the MS medium containing only 0.1 M sorbitol as the sole carbon source.
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