Growth, content of chrorophyll-carotenoid, saponins, and activity of nitrate reductase of Acalypha (Acalypha indica L.) under teh different concentrations of gibberelic acid (GA3)

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DWI KARSIWI PENI
SOLICHATUN SOLICHATUN
ENDANG ANGGARWULAN

Abstract

Abstract. The aims of this research were to find out the influence of gibberellic acid supply on growth, the content of chlorophyll-carotenoid, saponins, and nitrate reductase activity of acalypha (Acalypha indica L.). The framework of this research was that the supply of gibberellic acid would influence cell division and cell enlargement. The effect of gibberellic acid at cell division occurred in the cell cycle by shortening the G1 phase. Gibberellic acid will force the cell enlargement by the possibility of increasing cell osmotic pressure and membrane permeability that in turn cause water osmotic so that the cell enlargement has taken place. The role of gibberellic acid is to support cell elongation, cambium activity, RNA synthesis, and protein synthesis. The method used in this research was a completely randomized design with one factor, the treatment of GA3 supply in 5 level concentrations, 0 ppm, 25 ppm, 50 ppm, 75 ppm, and 100 ppm, each given twice a week for a month. The result of the research indicated that the spray of GA3 with a concentration of 50 ppm could increase the growth, saponin, and nitrate reductase activity of acalypha. In comparison, the spray of a higher concentration of GA3 (more than 50 ppm) tends to decrease those three parameters.

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