Antibacterial activity of Acacia mangium (Willd.) extract against Xanthomonas oryzae pv. oryzae / Hasnidar Iskandar

Bacterial Blight Disease (BLB) caused by Xanthomonas oryzae pv. oryzae is one of the destructive bacteria on rice. The impact of bacterial infection is heavy economic loss to the planters. Recently, the application of synthetic chemical substance in order to suppressed the bacterial growth was reported to give negative impact on consumers. Therefore, in this study an alternative approach by using methanolic plant extracts of Acacia mangium which is its bark, leaf and flower were tested. The methanolic plant extract were obtained by using dried parts of the plants and extracted in trough a maceration method. The plant component were screened and the antibacteria activity were tested. The phytochemical screening tested indicated that each part of the plants containing alkaloids, phenol, saponin, flavonoids, terpenoids, tannins, quinoine, glycoside, steroids and proteins which have potential as an antifungal, antioxidants and as plant pests control. The antibacterial activity was tested by using the disc diffusion technique against the Xanthomonas oryzae pv. oryzae with the concentration of 0.1, 0.2, and 0.3 g/mL on each of the plant extracts. However, no inhibition zone was observed. It indicated that, there is no antibacterial activity against Xanthomonas oryzae pv. Oryzae. Therefore, it is recommended that to make further study about the potential of this plant against the bacteria.