摘要：Giberelic acid (GA3) would caused specific gene activation, so that specificmRNA formed and would triggered one or more enzim forming whichregulate plant growth. Giberelic acid (GA3) would effected the totalchlorophyll and respiration rate that support arrow root (Marantaarundinacea) growth. The aim of this research was to learn the effect oftreatment the giberelic acid (GA3) on growth, chlorophyll content andrespiration rate of arrow root (M. arundinacea L.). This research usedcompletely randomized design with one factor that was GA3 treatmentwhich 0 ppm, 50 ppm, 100 ppm, 150 ppm and 200 ppm concentration. Themeasuring variables consist of hight, amount of leaves, width of leaves,fresh weight, dry weight, amount of filial, length and amount of stomata,total chlorophyll content and respiration rate. Data was analized byanalysis of varians (ANAVA) and was continued by DMRT 5%. The resultof this research showed that treatment 50 ppm of giberellic acid (GA3)caused the highest of plant growth that was showed by hight plant variabel,fresh weight and dry weight of plant. Giberelic acid concentration thatmore higher (100, 150, 200) ppm caused decrease of plant growth. Giberelicacid treatments are not influence for chlorophyll content. Giberelic acid(GA3) with concentration 100 ppm resulting 21,05 ppm CO2/L/menit as thehighest of respiration rate of arrow root (M. arundinacea).
