Novel Polysaccharide Produced by Bradyrhizobium Japonicum Enhances Competitiveness at High pH and Ca
| Autor: | J. G. Streeter |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
inorganic chemicals
Nodule (geology) chemistry.chemical_classification Strain (chemistry) biology Chemistry Mutant technology industry and agriculture respiratory system engineering.material biology.organism_classification Polysaccharide Microbiology Soil pH mental disorders engineering health care economics and organizations Bradyrhizobium japonicum |
| Zdroj: | Highlights of Nitrogen Fixation Research ISBN: 9781461371724 |
| DOI: | 10.1007/978-1-4615-4795-2_47 |
| Popis: | A polysaccharide produced by some strains of B. japonicum accumulates to high concentrations in soybean nodules. This structurally unique polysaccharide is referred to as “NPS” for nodule polysaccharide. Surveys of soybean nodules from randomly selected farmer fields indicated that NPS forming strains are the dominant nodule occupants at sites where soil pH and [Ca] are relatively high. Recent studies have involved analysis of nodule occupancy by an NPS+ strain versus a NPS- transposon insertion mutant in sand culture and soil in the greenhouse. Preliminary results indicate that elevation of pH or Ca does increase nodule occupancy by the NPS+ strain. These results suggest that NPS synthesis must not be restricted to the nodule environment as previously thought and, in fact, synthesis of NPS in culture has recently been demonstrated. |
| Databáze: | OpenAIRE |
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