Construction and environmental release of a Sinorhizobium meliloti strain genetically modified to be more competitive for alfalfa nodulation

Article Abstract:

Research has been conducted on the nitrogen-fixing Rhizobium strains. The use of the putA gene in increasing the Sinorhizobium meliloti strain's competitiveness has been investigated, and the results are discussed.

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Improved properties of Baker's yeast mutants resistant to 2-deoxy-D-glucose

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Research has been conducted on the spontaneous mutants from Saccharomyces cerevisiae. The isolation of these mutants resistant to 2-deoxy-D-glucose has been carried out and the results indicate their improved fermentative capacity on sweet doughs.

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Isolation and characterization of alfalfa-nodulating rhizobia present in acidic soils of Central Argentina and Uruguay

Article Abstract:

Two rhizobial populations with pronounced differences in their acid tolerance and symbiotic properties were found to be present in alfalfa-nodulating rhizobia from acid soils of different locations in Central Argentina and Uruguay. The 15 acid-tolerant isolates were able to grow at pH 5.0 and formed nodules in alfalfa with a low rate of nitrogen fixation. They also share a genetic background closely related to that of Rhizobium sp. Or191 recovered from an acid soil in Oregon. Results demonstrate that similar populations of acid-tolerant alfalfa-nodulating rhizobia exist in geographically distant regions where soil acidity is a common characteristic.

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