Question

Discuss the role of free-living N2 fixation in supplying plants with N and factors that influence free-living N2 fixation rates

Answer 1

Most N2  Fixing microbes, however, are not associated with either plants or animals. They live free in the soil and fix N2 for their own benifits. Of these free living bacteria, only the cynobacteria are agriculturally important. Further explanation and free living bacteria's role are as follows:-
Role of free - living N2 fixation rates face-living Ng - fixing bacteria :- =) Most N₂- fixing microbes, re not as socialed ney live free in the Benefits of these free via coce agricullu with either plants or animals. They live free Soil and fix Nz for their own benefits of thes living bacteria, only the cyanobacteria are ag orally important. The most extensively studied free-living bacteria are;- Azotobacter vinelandii (an obligate aerobe), Klebsiella pneumoniae la facultative anaerobe), Clostridium pasteurianum (an obligate anacrobe), Rhodobacter capsulatus La bhotosynthetic bacterium) Anabaena and Mostec species ( heterocyst -forming wyanobacteria). » N2 fixed by these organisms only after when the bacteria die in the ecosystem. Ô Nitrogen cycle r Atmospheric Na Nitrogon is a constituent Biological andustrial electrical of amino acids, proteins, N2 fixation 2 fixation N2 fixation hormones, chlorophylls and many of the vitamins. NH3 NO₂ NO2 Soil'N' Pool 7) The process of ammonia nitrogen (N2) to ammonia (Ammonificatien) uptake) is termed as nitrogen Becaying & fixation. Plant biomass ( biomas Animal bienas

ce living bacteria help in nodule formation: he Rhizobium bacteria divido and form colonies. ese get attached to the root hairs and epidermal cells. The root hairs bacteria. get coiled and are invaded by the a go soil particles anfertion thread 3) The's invasion is followed by the formation of an infection thread that caviers the bacteria into the cortex of the droot. The bacteria get modified into odd-shaped bacteroides. 4) As a result, the cells in the cortex and pericycle undergo division, leading to the formation of roof nodule 5) The nodules finally get connected with the vascular tissues of the roots for nutrient Exchange. He took H voor hair onfection ere Els Bacteria y containing Y and pericycle mature cells under nodule. division factors influence free living My fixation rates: - fluctuations in pH, nutrient availability, temperature, and water status, among other factors, greatly influence the growth, survival, and metabolic activity of nitrogen fixing bacteria. > The subsequent inhibition of nitrogen fixation bacteria. The subsequent inhibition of nitrogenase would result in D2 accumulation in the infected zones, inducing the Secrease in nodule permeability. Bacteria Snner cortex bad. un

I Poor nodulation nodulation of ue to decreases legumes in in population aid soils is likely levels of rhizobia during the day season. eas tixation, therefore, also tends to do soll N. calcium deficiency, with or without the confounding influence of cow pH also affects attachment of chi zobia to root hairs. & Rhizobia may have different tolerances to soil acidity factors than the host plant. - Relatively high root temperature has also been shown to influence infection, N-2 - fixation ability, and tegume gecowth. Also, molt nodulation by the bacteria can be dependent on the formation of my couchiza.