We examined the effects of aluminum chloride (AlCl 3 ) on the organogenesis of Cymbidium Sweet Waffle 'Tarte' from inoculated protocorm-like bodies (PLBs) and of Cymbidium kanran 'Murotonishiki' from rhizomes to determine the appropriate concentration of AlCl 3 for organogenesis. The explants were cultured in modified MS media supplemented with various concentrations of AlCl 3 and maintained at 25Ϯ1℃ and a 24 h light period for 6 weeks for C. Sweet Waffle 'Tarte' and 10 weeks for C. kanran 'Murotonishiki.' In C. Sweet Waffle 'Tarte' 1.0 mg L Ϫ1 AlCl 3 significantly increased PLB formation, shoot formation from PLBs and root formation from shoot. In C. kanran 'Murotonishiki,' 1.0 mg L Ϫ1 AlCl 3 induced shoot from rhizome and developed roots from shoot. On the other hand, high concentration of AlCl 3 (10 mg L Ϫ1 ) resulted the formation of protocorm-like shoots in both Cymbidiums. We concluded that the concentration of 1.0 mg L Ϫ1 AlCl 3 is optimum for the root and shoot formation of the Cymbidium orchids.
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