Screening of Bacillus sp. as Plant Growth-Promoting Bacteria
Keywords:
plant growth promoting rhizobacteria, screening, bacillusAbstract
The effective bacteria were isolated from soil samples in the central and eastern regions of Thailand. A total of 260 bacterial isolates were collected, of which 30 were spore-forming bacteria. These spore-forming bacteria were tested for hemolytic activity to assess preliminary safety and tested further based on plant growth-promoting abilities such as phosphate solubilization, plant pathogen inhibition (against Erwinia carotovora, Ralstonia solanacearum, Xanthomonas axonopodis pv. citri, and X. oryzae pv. oryzae) and plant hormone production (indole acetic acid and gibberellic acid). Results showed that all isolated strains exhibited different abilities of plant growth-promoting traits. Thus, the potential PGPB strains were selected and identified based on 16S rDNA sequence. Nine effective isolated strains consisting of A8, A21, Bb_4.2, Bc_2.1, Bc_6.1, BS2_1.2, BC2_3.2, BZ2_5.1, and BB2_4.3 were identified as Bacillus zanthoxyli, B. velezensis, B. tequilensis, B. infantis, B. infantis, B. licheniformis, B. wiedmannii, B. altitudinis and B. aryabhattai, respectively.
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