Bradyrhizobium japonicum Mutants with Enhanced Sensitivity to Genistein Resulting in Altered nod Gene Regulation
Bradyrhizobium japonicum mutants with altered nod gene induction characteristics were isolated by screening mutants for genistein-independent nod gene expression. Plasmid pZB32, carrying a nodY∷lacZ transcriptional gene fusion, was introduced into B. japonicum cells that had been subjected to UV mut...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
The American Phytopathological Society
2001-12-01
|
| Series: | Molecular Plant-Microbe Interactions |
| Online Access: | https://apsjournals.apsnet.org/doi/10.1094/MPMI.2001.14.12.1404 |
| _version_ | 1811287218938970112 |
|---|---|
| author | H. Ip F. D'Aoust A. A. Begum H. Zhang D. L. Smith B. T. Driscoll T. C. Charles |
| author_facet | H. Ip F. D'Aoust A. A. Begum H. Zhang D. L. Smith B. T. Driscoll T. C. Charles |
| author_sort | H. Ip |
| collection | DOAJ |
| description | Bradyrhizobium japonicum mutants with altered nod gene induction characteristics were isolated by screening mutants for genistein-independent nod gene expression. Plasmid pZB32, carrying a nodY∷lacZ transcriptional gene fusion, was introduced into B. japonicum cells that had been subjected to UV mutagenesis. Ten independent transformants producing a blue color on plates containing 5-bromo-4chloro-3indolyl-β-d-galactopyranoside but lacking genistein, indicative of constitutive expression of the nodY∷lacZ reporter gene, were isolated. β-Galactosidase activity assays revealed that while all of the 10 strains were sensitive to low concentrations of genistein, none exhibited truly constitutive nodY∷lacZ expression in liquid culture. Soybean plants inoculated with three of the mutants were chlorotic and stunted, with shoot dry weights close to those of the uninoculated plants, indicating the absence of nitrogen fixation. Differences in the kinetics of nodY∷lacZ expression and lipochitin oligosaccharide Nod signal production suggested that the strains carried different mutations. Some of these strains may be useful in mitigating the low root zone temperature-associated delay in soybean nodulation at the northern extent of soybean cultivation. |
| first_indexed | 2024-04-13T03:14:52Z |
| format | Article |
| id | doaj.art-04cd2c06014e49e4a8d13b1e149a2178 |
| institution | Directory Open Access Journal |
| issn | 0894-0282 1943-7706 |
| language | English |
| last_indexed | 2024-04-13T03:14:52Z |
| publishDate | 2001-12-01 |
| publisher | The American Phytopathological Society |
| record_format | Article |
| series | Molecular Plant-Microbe Interactions |
| spelling | doaj.art-04cd2c06014e49e4a8d13b1e149a21782022-12-22T03:04:56ZengThe American Phytopathological SocietyMolecular Plant-Microbe Interactions0894-02821943-77062001-12-0114121404141010.1094/MPMI.2001.14.12.1404Bradyrhizobium japonicum Mutants with Enhanced Sensitivity to Genistein Resulting in Altered nod Gene RegulationH. IpF. D'AoustA. A. BegumH. ZhangD. L. SmithB. T. DriscollT. C. CharlesBradyrhizobium japonicum mutants with altered nod gene induction characteristics were isolated by screening mutants for genistein-independent nod gene expression. Plasmid pZB32, carrying a nodY∷lacZ transcriptional gene fusion, was introduced into B. japonicum cells that had been subjected to UV mutagenesis. Ten independent transformants producing a blue color on plates containing 5-bromo-4chloro-3indolyl-β-d-galactopyranoside but lacking genistein, indicative of constitutive expression of the nodY∷lacZ reporter gene, were isolated. β-Galactosidase activity assays revealed that while all of the 10 strains were sensitive to low concentrations of genistein, none exhibited truly constitutive nodY∷lacZ expression in liquid culture. Soybean plants inoculated with three of the mutants were chlorotic and stunted, with shoot dry weights close to those of the uninoculated plants, indicating the absence of nitrogen fixation. Differences in the kinetics of nodY∷lacZ expression and lipochitin oligosaccharide Nod signal production suggested that the strains carried different mutations. Some of these strains may be useful in mitigating the low root zone temperature-associated delay in soybean nodulation at the northern extent of soybean cultivation.https://apsjournals.apsnet.org/doi/10.1094/MPMI.2001.14.12.1404 |
| spellingShingle | H. Ip F. D'Aoust A. A. Begum H. Zhang D. L. Smith B. T. Driscoll T. C. Charles Bradyrhizobium japonicum Mutants with Enhanced Sensitivity to Genistein Resulting in Altered nod Gene Regulation Molecular Plant-Microbe Interactions |
| title | Bradyrhizobium japonicum Mutants with Enhanced Sensitivity to Genistein Resulting in Altered nod Gene Regulation |
| title_full | Bradyrhizobium japonicum Mutants with Enhanced Sensitivity to Genistein Resulting in Altered nod Gene Regulation |
| title_fullStr | Bradyrhizobium japonicum Mutants with Enhanced Sensitivity to Genistein Resulting in Altered nod Gene Regulation |
| title_full_unstemmed | Bradyrhizobium japonicum Mutants with Enhanced Sensitivity to Genistein Resulting in Altered nod Gene Regulation |
| title_short | Bradyrhizobium japonicum Mutants with Enhanced Sensitivity to Genistein Resulting in Altered nod Gene Regulation |
| title_sort | bradyrhizobium japonicum mutants with enhanced sensitivity to genistein resulting in altered nod gene regulation |
| url | https://apsjournals.apsnet.org/doi/10.1094/MPMI.2001.14.12.1404 |
| work_keys_str_mv | AT hip bradyrhizobiumjaponicummutantswithenhancedsensitivitytogenisteinresultinginalterednodgeneregulation AT fdaoust bradyrhizobiumjaponicummutantswithenhancedsensitivitytogenisteinresultinginalterednodgeneregulation AT aabegum bradyrhizobiumjaponicummutantswithenhancedsensitivitytogenisteinresultinginalterednodgeneregulation AT hzhang bradyrhizobiumjaponicummutantswithenhancedsensitivitytogenisteinresultinginalterednodgeneregulation AT dlsmith bradyrhizobiumjaponicummutantswithenhancedsensitivitytogenisteinresultinginalterednodgeneregulation AT btdriscoll bradyrhizobiumjaponicummutantswithenhancedsensitivitytogenisteinresultinginalterednodgeneregulation AT tccharles bradyrhizobiumjaponicummutantswithenhancedsensitivitytogenisteinresultinginalterednodgeneregulation |