Plant-growth-promoting rhizobacteria Bacillus subtilis RR4 isolated from rice rhizosphere induces malic acid biosynthesis in rice roots
| Autor: | Santhanam Srinath, Baburaj Baskar, B. Usha, Kandaswamy Rekha |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
0301 basic medicine 030106 microbiology Immunology Malates Bacillus subtilis Rhizobacteria 01 natural sciences Applied Microbiology and Biotechnology Microbiology Plant Roots 03 medical and health sciences chemistry.chemical_compound Biosynthesis Malate synthase Botany Genetics Molecular Biology chemistry.chemical_classification Rhizosphere biology Chemotaxis Oryza General Medicine biology.organism_classification chemistry Biochemistry biology.protein Malic acid 010606 plant biology & botany Organic acid |
| Zdroj: | Canadian journal of microbiology. 64(1) |
| ISSN: | 1480-3275 |
| Popis: | Malic acid (MA), one of the major organic acid exudates from roots, plays a significant role in the chemotaxis of beneficial bacteria to the plant’s rhizosphere. In this study, the effect of a plant-growth-promoting rhizobacterium, Bacillus subtilis RR4, on the synthesis and exudation of MA from roots is demonstrated in rice. To test the chemotactic ability of strain RR4 towards MA, a capillary chemotaxis assay was performed, which revealed a positive response (relative chemotactic ratio of 6.15 with 10 μmol/L MA); with increasing concentrations of MA, an elevated chemotactic response was observed. Quantitative polymerase chain reaction, performed to analyze the influence of RR4 on the MA biosynthetic gene, malate synthase (OsMS), and the transporter gene, aluminium-activated malate transporter (OsALMT), demonstrated significant differential expression, with 1.8- and –0.58-fold changes, respectively, in RR4-treated roots. The gene expression pattern of OsMS corroborated the data obtained by high-performance liquid chromatography, which showed elevated MA levels in roots (1.52-fold), whereas the levels of MA in root exudates were not altered significantly although expression of OsALMT was reduced. Our results demonstrate that B. subtilis RR4 is chemotactic to MA and can induce biosynthesis of MA in rice roots. |
| Databáze: | OpenAIRE |
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