Formation of novel polysaccharides by Bradyrhizobium japonicum bacteroids insoybean nodules

Article Abstract:

Polysaccharides in the root nodules of soybean plants are produced by certain strains of Bradyrhizobium japonicum. This was proved by this study as opposed to the results of a previous similar study. This study demonstrated that the nodule polysaccharides were produced by bacteria and not by plants because of their composition, bacterial genotype influence on their formation, and its localization inside the plant-derived membrane called the symbiosome membrane.

Microbial polysaccharides, Plant morphology

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Siderophore utilization by Bradyrhizobium japonicum

Article Abstract:

The utilization of siderophores by Bradyrhizobium japonicum USDA 110 and 61A152 was examined. Both strains can utilize the hydroxamate-type siderophores ferrichrome and rhodotorulic acid and the pyoverdin-type siderophore pseudobactin St3, in addition to ferric citrate, in order to overcome iron starvation. The ability to utilize the siderophores of another organism is a selective advantage in the rhizosphere.

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The soybean Rj4 allele restricts nodulation by Bradyrhizobium japonicum serogroup 123 strains

Article Abstract:

Nodulation studies confirm restriction of cultivar Hill by Bradyrhizobium japonicum serogroup 123 strains. This serogroup consists of serologically related but genetically diverse strains that differ in the ability to nodulate specific soybean genotypes. ELISA results indicate that serogroup 123 strains has antigenic relatedness with serogroup 31 strain related to nodulation restriction.

Research, Plant-pathogen relationships

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