AI Article Synopsis
- The purL gene in Sinorhizobium fredii is crucial for establishing nitrogen-fixing nodules during the nodulation process.
- Experiments revealed that different levels of purL expression influenced S. fredii's ability to compete for nodules, especially in early stages of nodulation.
- A strain lacking purL expression failed to compete for nodules, highlighting the importance of this gene in Rhizobium-plant interactions.
Article Abstract
Purine pathway in Rhizobium is important during the nodulation processes. The purL gene in Sinorhizobium fredii (S. fredii) has been identified to be required for the whole establishment of a nitrogen-fixing nodule. To get a better understanding of the purL gene's impacts on Rhizobium-plant interaction, the competitive nodulation abilities of S. fredii containing different purL expression plasmids were studied. Several kinds of coinoculations were performed, including using different bacterial concentration ratios, with or without the supplementation of purine source in the plant nutrient solution, and the delayed coinoculation tests. The results indicated that the competitive nodule occupancy of S. fredii was affected significantly by the purL expression level during the early nodulation periods. The mutant strain containing no purL expression could not elicit competitive nodules both in the presence and absence of purine source. A positive linear correlation within certain limits was observed between strain's competitive nodule occupancy and purL gene expression level. All these results suggested that the purL gene played a role in the competitive nodulation of S. fredii.
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| http://dx.doi.org/10.1007/s00284-009-9420-0 | DOI Listing |
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