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

The aims the research were to study the influence of indol acetic acid (IAA) on growth, quantity and diameter of secretory cells of Curcuma domestica rhizome. Indol acetic acid has ability to stimulate division, enlargement and differentiation of parenchymal cell. Completely randomized design (CRD) with one factor of IAA application with concentration of 0, 100, 200, and 300 ppm subsequently in with triplicate was used in this study. The first application given when the plant was one month age, and then given once every two weeks until the plant was four months age. Parameters of growth including height, quantity and width of leaves were observed once every two weeks. The last observation was done for wet and dry weight of plant and rhizome. Anatomical parameter was done by preparing a semipermanent preparat, and continued with observation of quantity and diameter of the secretory cells. Data were then analyzed statistically by Anova followed with DMRT in 5% confidence level. The results indicated that IAA significantly influences plant height, leave width, plant weight at 200 ppm. Higher concentration of IAA raised the quantities of secretory cells, but decrease secretory cells diameters.