The influence of indole acetic acid on growth, quantity, and diameter of secretory cells of turmeric rhizome (Curcuma domestica Val.)

Abstract

Abstract. The research aims to study the influence of indol acetic acid (IAA) on the growth, quantity, and diameter of Curcuma domestica rhizome secretory cells. Indole acetic acid could stimulate division, enlargement, and differentiation of the parenchymal cell. A completely randomized design (CRD) with one factor of IAA application with a concentration of 0, 100, 200, and 300 ppm subsequently in with triplicate was used in this study. The first application was given when the plant was one month old and then given once every two weeks until the plant was four months old. Growth parameters, including height, quantity, and width of leaves, were observed once every two weeks. The last observation was done for plants and rhizomes’ wet and dry weights. The anatomical parameter was done by preparing a semi-permanent preparat and observing the quantity and diameter of the secretory cells. Data were then analyzed statistically by ANOVA followed by DMRT with a 5% confidence level. The results indicated that IAA significantly influences plant height, leave width, and plant weight at 200 ppm. A higher concentration of IAA raised secretory cells' quantities but decreased secretory cells’ diameters.