Heat and cold shock protein synthesis in arctic and temperate strains of rhizobia

Article Abstract:

The heat and cold shock proteins of three arctic and three temperate strains of rhizobia were compared to understand the factors influencing temperature adaptation in this organism. The results showed that the different rhizobia strains could synthesize proteins at temperatures not permissive for growth. In addition, the arctic strains synthesized HSPs at higher temperatures than their temperate counterparts. In contrast, under freezing temperatures, the arctic strains produced more CSPs, although these proteins did not appear to confer any survival advantages to the strains under freezing conditions.

Rhizobium, Heat shock proteins

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Ice nucleation activity in Fusarium acuminatum and Fusarium avenaceum

Article Abstract:

Twenty fungal cultures were tested for ice nucleation activity (INA) at -5.0 degrees celsius using a modified tube nucleation test. The results showed that only Fusarium acuminatum and F. avenaceum possessed INA. Characterization of the Fusarium ice nuclei showed that they are cell free, stable up to 60 degrees celsius and have sizes less than 0.22 microns. Comparisons with other types of ice nuclei showed that the fungal ice nuclei are most similar to the leaf-derived ice nuclei. INA may be used as a basis of identification of these species, and may have important applications in biotechnology.

Fungi, Microbial biotechnology, Fusarium, Frost

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Effect of compost on rhizosphere microflora of the tomato and on the incidence of plant growth-promoting rhizobacteria

Article Abstract:

A comparative study of the influence of four commercial composts on total rhizosphere microflora, plant growth and incidence of plant growth-promoting rhizobacteria in the rhizosphere of tomato plants reveals that plant growth is significantly increased by three of these composts, while one compost inhibits the plant growth. Antagonist proliferation in the rhizosphere is stimulated by compost and application of composts helps protect plants from soilborne root pathogenes.

Compost

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