Selection of Organic Ecotype Soilless Culture Media for Gerbera jamesonii Influence of S-3307 on Fresh-keeping of Cut Flowers of Gerbera jamesonii Bolus Anatomical Structure observation of Stem Blockage in Cut Gerbera Flowers Selection of Organic Ecotype Soilless Culture Media for Gerbera jamesonii Preliminary Studies on Polyploidy Mutation of Cut Flower Gerbera jamesonii Bolus Preliminary Studies on Polyploidy Mutation of Cut Flower Gerbera jamesonii Bolus