A mutant of Azospirillum brasilense Sp7 impaired in flocculation with a modified colonization pattern and superior nitrogen fixation in association with wheat

Article Abstract:

The Azospirillum brasilense strain Sp7 spontaneously mutates to form the strain Sp7-S which is genetically similar to Sp7. However Sp7-S does not produce exopolysaccharides, flocculate in fructose and nitrate and does not have the surface capsule present in Sp7. If a cloned 9.4-kb fragment is added, Sp7-S regains these properties. Sp7-S is able to enter the lateral roots' basal region and grows vegetatively instead of forming cyst-like cells and is thus able to fix nitrogen better than Sp7 which maybe because of a difference in the metabolism of the two strains.

Environmental aspects, Bacteria, Morphology (Biology), Wheat

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Promotor of nod gene inducers and nodulation in common bean (Phaseolus vulgaris) roots inoculated with Azospirillum brasilense Cd

Article Abstract:

Coinoculation of Phaseolus vulgaris with Rhizobium and Azospirillum results in increased susceptibility to Rhizobium infection.It is caused by increase in the number of infectible root hairs and the nod gene induction from the enhanced secretion of flavonoids by the roots. Root hair density of bean seedlings increase significantly by inoculation with Azospirillum brasilense. Root exudates from the inoculated plants increases the level of nod gene inducing, flavonoid compounds.

Physiological aspects, Kidney bean, Kidney beans, Root hairs

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Mutants with enhanced nitrogenase activity in hydroponic Azospirillum brasilense-wheat associations

Article Abstract:

Research has been conducted on the Azospirillum brasilense nitrogenase expression. The effect of mutation on this expression has been investigated.

Australia, Statistical Data Included, Analysis, Gene mutations, Gene mutation, Nitrogenase, Microbiological research, Hydroponics

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