Abstract
The rhizosphere microorganisms can form beneficial, pathogenic, or neutral relationships. These relationships can promote plant growth and productivity. Among them, a number of Variovorax isolates from the rhizosphere were isolated. Bacteria Variovorax strain C6d (AB552893) was isolated from the non axenic culture of Chlorella spp., C6. The cell was Gram-negative, motile, non-spore-forming, short and rod-shaped (0.5-1.0x1.5-2.0µm). Colonies were in white colour after 7 days on 10-fold diluted Nutrient Broth. The strain was able to tolerate NaCL to 1.0% but not to 4.0% of NaCl. It grew quite well at temperatures ranging from 10°C to 37°C, yet did not show any growth at 4°C and 42°C. The dominant isoprenoid quinone was ubiquinone 8 (Q8). The major fatty acid composition of this strain was summed feature 3, 16:0 and 18:1:w7. The DNA G+C content of strain C6d was 70.4 mol%.
Highlights
The phycosphere is the zone surrounding an algal cell within which microorganisms are influenced by algal products
Not a small number of microalgae are living in soil, and the phycosphere in soil may represent a good microhabitat for soil bacteria
The almost full length of the 16S ribosomal RNA gene of the isolate was amplified by polymerase chain reaction (PCR) with the forward primer 27F and the reverse primer 1492R that corresponds to the positions
Summary
The phycosphere is the zone surrounding an algal cell within which microorganisms are influenced by algal products. Not a small number of microalgae are living in soil, and the phycosphere in soil may represent a good microhabitat for soil bacteria. Studies on the associations between green microalgae (phylum Chlorophyta, kingdom Plantae) and bacteria are considered to be of great value, because the form is a microorganism-microorganism association but, at the same time, may be a primitive plantmicroorganism association. Rhizosphere microbes that can form beneficial, pathogenic, or neutral relationships. Understanding these associations can inform strategies for manipulating the plant’s microbiome to promote plant growth and productivity. Among the microorganisms isolated from the rhizosphere are a number of Variovorax isolates (Jennifer, 2019).
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