The Evaluation of Potential Agriculturally Beneficial Bacteria from Rhizosphere Soil of Sangyod Rice
DOI:
https://doi.org/10.14456/jare-mju.2025.47Keywords:
plant growth promoting bacteria, soil, rhizosphere, Sangyod riceAbstract
Sangyod rice is the most popular native rice variety in Phatthalung province. However, its low productivity is due to soil quality. Farmers often use chemical fertilizers to increase productivity, which can negatively affect soil quality and leave chemical residues. This research aimed to isolate and evaluate the plant growth-promoting ability of bacteria isolated from the rhizosphere soil of Sangyod rice. The result showed that 18 isolated bacteria had the ability to produce indole acetic acid (IAA) at 5.04±0.26 – 89.58± 0.26 µg/ml. The 11 isolates, which produce IAA more than 50 µg/ml were selected for screening of nitrogen fixation activities. It was found that 4 isolates which were SS10, SS19, SS36 and SS41 showed nitrogen fixing ability. These isolates were later evaluated for their phosphate solubilizing activities on Pikovskaya’s (PVK) agar and growth inhibition of Alternaria sp. The result showed all 4 isolates were able to solubilize phosphate on PVK, with the highest phosphate solubilization index of 2.46 was obtained from SS10. While the ability to inhibit the growth of Alternaria sp. was observed in SS10 and SS36 with a percentage inhibition of 33.63 and 36.60%, respectively. Finally, SS10, SS36 and SS41 were selected for evaluation in their stimulation of Sangyod rice seed germination. The results showed that all selected bacteria did not significantly affect seed germination percentage compared to the control, while strain SS36 exhibited the highest significant ability to promote root growth, with a root length of 13.21±1.34 mm. This study found that isolated bacteria have potential for promoting plant growth and could be developed into a bio-fertilizer for enhancing rice growth.
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