The Effect of Several Minerals Element on Polyphenol Content and Lignocellulosic Materials in Seedling of Arabica Coffee Leaves

Abstract

Every plant needs specific growing condition. An unsuitable growing environmtent can affect plant health. Likewise the arabica coffee which cultivated at an altitude under 1000 masl. Coffee plants become more susceptible to biotic and abiotic disturbances. In generally, plants have a natural resistance to enhance the disease. This natural resistance will be expose while the plant in healthy condition and has sufficient nutrients. Various research state that there are mineral nutrients that potential to increase the natural resistance of plants, but it is noy known yet which elements that play more dominanan effect. Therefore, it is necessary to test the addition of mineral elements that can induce the plants natural resistance. This research was conducted using RCBD with 3 times replications. There are 7 treatments in this experiment, namely control (without additional mineral element), Silica 150 mg L^-1, boron 300 mg L^-1, iodine 300 mg L^-1, calcium 3000 mg L^-1, potassium mg L^-1, and mix of them. The observed variables focused on the production of polyphenol and lignocellulosic materials as natural defense. The statistically of addition of mineral elements was very significant to polyphenol content. Mineral calcium, iodine, and potassium potential gives natural resistance of plants. It shown with polyphenols production which higher than other minerals. The production of polyphenols also supported the forming of lignocellulosic material according to the character of each mineral element.

 Keywords: Arabica coffee, lignocellulosic material, mineral element, polyphenol.