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All Journal Asian Journal of Agriculture Biodiversitas Journal of Biological Diversity
IRWANDHI IRWANDHI
Graduate Program of Soil Science, Faculty of Agriculture, Universitas Padjadjaran. Jl. Raya Bandung-Sumedang Km. 21, Jatinangor, Sumedang 45363, West Java, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Evaluation of Bacillus cereus bioinoculants for biocontrol of bacterial leaf blight and growth promotion in shallots NUR PRIHATININGSIH; ROBI AZIS ARIFIANTO; DINA ISTIQOMAH; IRWANDHI IRWANDHI
Asian Journal of Agriculture Vol. 10 No. 1 (2026)
Publisher : Smujo International

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/asianjagric/g100136

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Abstract. Prihatiningsih N, Arifianto RA, Istiqomah D, Irwandhi. 2026. Evaluation of Bacillus cereus bioinoculants for biocontrol of bacterial leaf blight and growth promotion in shallots. Asian J Agric 10 (1): g100136. https://doi.org/10.13057/asianjagric/g100136. Bacterial leaf blight (Xanthomonas axonopodis pv. allii) is a major disease of shallots (Allium cepa) that requires continuous control. The use of rhizobacterial bioinoculants is an environmentally friendly strategy that serves a dual role, as a biocontrol and a plant growth promoter. This study aims to evaluate the bioinoculant Bacillus cereus in controlling bacterial leaf blight and increasing shallot growth. This research was conducted using a factorial Randomized Block Design (RBD) with 2 factors (cropping pattern and biofertilizer) and 3 replications. All B. cereus treatments inhibited the pathogen's growth in vitro via a bacteriostatic mechanism, with isolate Bm3 producing the largest inhibition zone (14.75 mm). In addition, each B. cereus isolate can produce siderophores and proteases, as well as dissolve phosphate. In field tests, B. cereus treatment can significantly reduce disease development compared to the control. The consortium treatment tended to show the highest efficacy, with low disease intensity (8.33%), control effectiveness of 51.93%, reduced AUDPC (23.50%), and increased nutrient uptake of shallot. These results indicate that the B. cereus bioinoculant, in the form of a consortium, has the potential to be an effective multifunctional inoculant for controlling bacterial leaf blight and enhancing growth in sustainable shallot cultivation.
Assessment of phosphate-solubilizing microbes isolated from indigenous organic-biofertilizers for enhancing plant growth in acid-stressed NADIA NURANIYA KAMALUDDIN; IRWANDHI IRWANDHI; PARTIKA ARUM; YUNUS SETIAWAN; FIQRIAH HANUM KHUMAIRAH; NUR PRIHATININGSIH; TUALAR SIMARMATA
Biodiversitas Journal of Biological Diversity Vol. 26 No. 3 (2025)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d260332

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Abstract. Kamaluddin NN, Irwandhi, Arum P, Setiawan Y, Khumairah FH, Prihatiningsih N, Simarmata T. 2025. Assessment of phosphate-solubilizing microbes isolated from indigenous organic-biofertilizers for enhancing plant growth in acid-stressed. Biodiversitas 26: 1325-1333. Indonesia is one of the countries that produces enormous amounts of organic waste every year, but most of this organic waste has not been appropriately managed, thereby worsening climate change. One alternative solution that is environmentally friendly and sustainable is converting organic waste into Indigenous Organic Biofertilizers (IOB). This process involves the controlled decomposition of organic waste, which is then enriched with beneficial microbes, such as Phosphate Solubilizing Microbes (PSM). PSM from IOB can be a candidate for a biofertilizer inoculant that can withstand environmental stress, especially acidity stress caused by climate change. This research aimed to screen, characterize, and assess the biochemical activity of isolates and molecularly identify PSM from IOB that are resistant to acidity stress. In this research, characterization was carried out in the form of macroscopic and microscopic observations, resistance to acidity stress, phosphate dissolution index, production of Indole-3-Acetic Acid (IAA), compatibility test, and identification of the 16S rRNA gene. Bacterial isolates with codes F1ZN1, F2P, and F6P, while fungal isolates F4A, F5B, and F5C were the best PSM isolates. This isolate can produce IAA with a high category of around 57.28-105.94 ppm (bacteria) and a medium category of around 18.34-24.33 ppm (fungi). Apart from that, these isolates are compatible with the isolates to work synergistically. Through molecular identification of 16S rRNA sequencing, F1ZN1 was identified as Enterobacter cloacae strain Ec030, F2P was identified as E. cloacae strain UT25, and F6P was identified as E. cloacae strain ABRL064. These results highlight the potential of PSM isolates from IOB as an effective biofertilizer inoculant candidate for increasing plant growth in environmental stress (acidity) amidst climate change.
Co-Authors DINA ISTIQOMAH FIQRIAH HANUM KHUMAIRAH NADIA NURANIYA KAMALUDDIN NUR PRIHATININGSIH NUR PRIHATININGSIH PARTIKA ARUM ROBI AZIS ARIFIANTO TUALAR SIMARMATA YUNUS SETIAWAN