Question

what are real microorganism that may be of positive use or a microorganism that may have a positive impact on something else (a prokaryote, a eukaryote, an acellular agent) and focus on any aspect of the microorganism – for example structure(s) and/or function(s) – that may have any positive outcome, use, or impact.

(1) that it must be within the natural capabilities of the microorganism and must be original.

Answer 1

Rhizobium- natural biofertilizer:

• Nitrogen is the most abundant form of nitrogen in environment but is not inactive and hence cannot be utilized as source of nitrogen.
• By nitrogen cycle, free nitrogen may be fixed by certain microorganisms.
• Microorganisms Rhizobia can convert Nitrogen to Ammonia.

N₂ + 3 H₂ --> 2NH₃

• Thus, Rhizobia are capable of fixing atmospheric nitrogen in soil, which act as natural biofertilizer for plants.

Characteristics of Rhizobia:

• Rhizobium is Gram negative bacteria that are diazotroph (Nitrogen fixer).
• They can form symbiotic association with leguminous plants to form root nodules.
• The plant release secondary metabolites (flavonoids) that are recognized by Rhizobia in the soil.
• This cause expression of nod genes (Nodulation genes) to produce Nod factors that in turn stimulate the symbiotic partner plant and process of nodule formation occurs.
• The bacteria thrives within the nodule by using nutrients (organic acids) supplied by the plant, while it uses nitrogen fixing enzymes (Nitrogenase) to fix nitrogen.
• Rhizobium have Molybdenum- Nitrogenous complex.