Abstract
The utilization of chemical fertilizers in agriculture production could cause harmful effects on human health and the environment, therefore the development and application of biofertilizers produced from beneficial microorganisms like plant growth-promoting rhizobacteria have been increasingly encouraged. The present study investigated the effects of the inoculation of the two Rhizobium pusense strains (R. pusense GCB108 and R. pusense GCB117) on the growth of the young rice plant (Oryza sativa L.) and white radish (Raphanus sativus L.). The results showed that the inoculation of the two R. pusense strains affected the growth of rice and white radish considerably. On day 7, the shoot length of Oryza sativa L. grown on the medium inoculated with the R. pusense GCB108 and GCB117 was 22.3 ± 0.42 cm and 21.6 ± 2.26 cm, respectively, while that recorded in the control sample (without bacterial inoculation) was only 18.25 ± 1.06 cm. On day 9, the shoot length of Raphanus sativus L. grown under the hydroponic condition and inoculated with the R. pusense GCB108 and GCB117 was 12.68 ± 1.22 cm and 13.69 ± 1.47 cm, respectively, while that recorded in the control sample was much lower (9.04 ± 1.86 cm). Moreover, the inoculation of R. pusense GCB108 and GCB117 also restricted the growth of the rice pathogen Pseudomonas oryzihabitans RL01 in the rice rhizosphere. Furthermore, the results from the biophysiological assay showed that both two strains R. pusense GCB108 and GCB117 could grow under a salinity environment (salt concentration of 3%) and a wide range of pH conditions (pH 5 – 11). The study demonstrates the importance of the R. pusense GCB108 and GCB117 inoculation in the growth of rice and white radish and suggests the potential application of those two strains in biofertilizer production to improve soil quality and stimulate plant growth, contributing to sustainable agriculture development.
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