Improving micropropagation efficiency and biochemical content of pineapple (Ananas Comosus) using stevia extract 1Taha, R. A., A.E. El Gohary2, Nagwa S.M. Zaied1 and S.A.M. Hassan1 1Tissue Culture Technique Lab., Pomology Department, Agriculture and Biology Research Institute and Central Laboratories Network, National Research Centre (NRC), 33 El Bohouth St., Dokki, Giza 12622, Egypt 2Medicinal and Aromatic Plant Dept., Pharmaceutical and Drug Industries Research Institute, NRC, 33 El Bohouth St