ISOLATION AND IDENTIFICATION OF BIOFLOCCULANT-PRODUCING BACTERIA FROM CASSAVA CULTIVATED SOIL OF VIET NAM

Microorganisms are found everywhere in the environment and play a leading role countless natural processes, amongst them, soil microorganisms important roles plant performance by improving mineral nutrition. Soil bacteria possess different biological activities; for example, producing bioactive compounds such as bioflocculant which makes smoother more breathable, growth stimulants or with antibiotic activity. Beside this, same could also be able to fix atmospheric nitrogen, converting it into form that plants can use. In order make microbial formula from local capable of well IAA fixing nitrogen towards organic fertilizer production application cassava cultivation, were isolated cultivated soils screened above mention activities. From 37 root samples collected at provinces North, Central South regions Vietnam, 80 strains activity over 50% screened. 3 (ĐQT1 Po6, ĐTAN6 Po2 ĐSBV Po1) not only high capacities, but ability nitrogen. The flocculant rate these was 80÷90% produce 6÷11 µg/mL IAA. selective identified having an analysis 16S rRNA gene sequence. obtained results showed sequence ĐQT1 Po6 100% identifiable corresponding Bacillus aryabhattai FORT 21 (Ass.No MG561348.1); sequences Po1 had homology those Enterobacter sp. KJ184880.1) subtilis SAN1.5 KX098457.1), respectively. These potential candidates perfect inoculant biofertilizer.