Spraying pre-harvest some of Amino acids on physicochemical, Enzymatic traits and Longevity gerbera flower cv. sorbet

Gerbera with scientific name Gerbera jamesonii belong to compositae family most important cut flowers all over the world. In recent years production and attention to it in Iran and world markets has increase. Amino acids biostimulative role in plant growth, shoot growth, increase plant resistance in the event of environmental stresses, accelerating the formation and development of organs, increase nutrient absorption, increase chlorophyll and chlorophyll production play. In the present study, the effect of the amino acids Glutamin, Arginin and Phenylalanin on physiological characteristics, morphological and enzymatic were evaluated gerbera flower pot c.v sorbet. In this experiment Glutamine, Arginin and Phenylalanin each with two doses of 50 and 100 ppm was use. The treatments were compared with control treatment(distilled water). This experiment, A completely randomized experimental design with 7 treatments, 3 replication, each replication contains 3 units on gerbera flower pot c.v sorbet was performed. Trait evaluated include the fresh weight, dry weight, number flower, leaf surface, cell membrance stability index, anthocyanine content, activity of enzymes phenyl alanine ammonia lyase(PAL) and longevity of flowers on the plant. this study in the summer of 2016 in commercial greenhouse located in the city PAKDASHT with an average daily temperature of 18° C and 28° C at night, relative humidity 60% and light intensity was 300 foot candle was performed. The results of the research and analysis of variance table 1 showed that the effect of treatments on all traits evaluated at different concentrations treatment is significant at 1% level. Glutamine 100ppm treatment and control treatment showed statistically significant difference with other treatments Duncan grouping. The result showed that the glutamin treatment 100ppm the greatest effects on improving all the traits than other treatments. Flower longevity on plant in glutamin 100ppm 20 days and in the control 14 Days. The results of this study indicate that the use of glutamine as a source of organic nitrogen plays a role in growth and differentiation of plant cells that eventually leads to more fresh weight, dry weight and number of flowers was. The use of glutamine induced physiological changes in gerbera flowers that stimulate plant growth, increase cell membrane stability index and petal anthocyanins. N also the top supplier of high intensity of photosynthesis and thus faster growth rate and ultimately increase the leaf surface. Glutamine also increases the PAL activity, which ultimately increases the strength and durability of gerbera stem on the plant.