Abstract
Suspension cultures composed of meristematic nodular cell clumps of Lilium x formolongi hort were established from shoot tips placed on MS medium supplemented with 1 mg/l picloram and 30 g/l sucrose, glucose, fructose or sorbitol. Protoplasts isolated from these cultures were embedded in 1 g/l gellan gumsolidified 1/2MS medium with 1 mg/l picloram and the different kinds of sugars at 0.5 M, and cultured at 25 °C in the dark. The highest plating efficiency (13.7%) was obtained when the protoplasts were isolated from the cell clumps which had been subcultured in MS medium containing glucose and were likewise cultured in MS medium supplemented with 0.5 M glucose. Plants were regenerated from the protoplast-derived calli on 1/2MS medium containing 2.5-10 g/l sucrose or 5-10 g/l glucose. These results suggest that the kinds of sugar and concentration are important parameters affecting protoplast isolation, proliferation and plant regeneration in L. x formolomgi hort.
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