Abstract
This study was conducted on 22 bacterial strains which were isolated from the rhizosphere of the black pepper plants and determinated the ability of nitrogen fixation, phosphate solubilization, IAA synthesis, and siderophore production in a previous research. The ability to degrade organic compounds including starch, protein, lipid, chitin and the fungal inhibition of these bacteria has been investigated by using agar well diffusion method. The results showed that the number of bacterial strains capable of degrading starch, protein, chitin and lipid were 21, 20, 12, and 10 respectively. Two bacterial strains including MH13 and ML17.1 were able to inhibit indicator fungi in which MH13 able to inhibit Fusarium sp. and ML17.1 able to inhibit all of the fungi including Fusarium sp., Penicillium sp., Aspergillus niger, A. flavus, and Cladosporium sp. The top 4 strains have been identified as Bacillus subtilis (ML17.1 and MH13) and Alcaligenes sp. (CT5 and TT5) by using MALDI-TOF mass spectrometry. These are plant-growth-promoting rhizobacteria that have been reported for potential applications in agriculture.
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