Preliminary Functional Analysis of Microtubule-associated Protein GMAP65-1 from Gerbera hybrida Chalcone Synthase Gene Cloning in Gerbera hybrida and Expression in E.coli in vitro Screening Procedure of Hydroxyproline-resisitant Lines of Gerbera hybrida Effects of Exogenous Ammonium on the Pigmentation and Growth in Gerbera hybrida Ray Floret Effects of Exogenous Ammonium on the Pigmentation and Growth in Gerbera hybrida Ray Floret