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Aims: The present study aimed to identify the potential ERB (endophytic root bacterium) and RSB (rhizospheric soil bacterium) of young oil palm trees against Ganoderma sp. JN234427, the causal pathogen of oil palm basal stem rot in Sabah. Methodology and results: Dual culture test was performed to select indigenous isolates with antagonistic character against Ganoderma sp. JN234427. Eleven RSB and fifteen ERB isolates were isolated from 5-year-old oil palm plots in the Faculty of Sustainable Agriculture, Universiti Malaysia Sabah. Gram's test and morphological features of all isolates were recorded and eight bacteria isolates with potential antagonistic activity were identified using the 16S rRNA gene sequences and Gen-III Biolog MicroStationTM automated identification system. The RSB3 Pseudomonas sp. SPLUMS-1 is one of the elite isolates with highest percentage inhibition of radial growth PIRG activity (57.5 %), followed by ERB15 Burkholderia sp. SPLUMS-2 (48.1 %), RSB4 P. tolaasii (44.3%), and RSB5 Bacillus subtilis (33.4 %). The PIRG activity of Pseudomonas sp. SPLUMS-1 and Burkholderia sp. SPLUMS-2 were further evaluated using agar amendment, culture filtrate and mycelia growth tests. The PIRG of Pseudomonas sp. SPLUMS-1 for the three tests mentioned above were 95.6 %, 100 % and 100 % respectively. Meanwhile, significant differences (p<0.05) in PIRG value were recorded between the agar amendment (20.1 %), culture filtrate (89.0 %) and mycelia growth (67.3 %) tests for Burkholderia sp. SPLUMS-2. Conclusion, significance and impact of study: Three bacterial genera consisting of Pseudomonas, Bacillus and Burkholderia were revealed in this study. The RSB3 and ERB15 isolates are potential biological control agents against Ganoderma sp. JN234427 for oil palm plantations in Sabah.

Isolation of rhizospheric and endophytic soil bacteria SPLUMS-1 and SPLUMS-2 of oil palm against Ganoderma sp. JN234427