In Vitro Regeneration of Miscanthus x giganteus through Indirect Organogenesis: Effect of Explant Type and Growth Regulators

Miscanthus x giganteus is a spontaneous sterile hybrid therefore the creation of useful genetic diversity by conventional breeding methods is restricted. Plant regeneration through indirect organogenesis may be a useful approach to create genetic variability of this important agricultural crop. The present study aimed to evaluate the effect of the explant type and growth regulators on indirect organogenesis of Miscanthus x giganteus and to determine the ploidy level of plant regenerants by flow cytometry. On average, the highest percentage of morphogenic callus tested explants formed in the medium supplemented with 2.5 mg L^-1 IBA + 0.1 mg L^-1 BAP + 4.0 mg L^-1 l-proline. The most intensive secondary differentiation of callus cells was observed in the medium supplemented with 4.0 mg L^-1 ZEA + 1.0 mg L^-1 NAA. The highest root formation frequency with the highest number of roots was determined in the MS nutrient medium supplemented with 0.4 mg L^-1 IBA, where more than 95% of plant regenerants survived and were growing normally.