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Role of Soil Microbes and Their Cell Components in Carbon Stabilization

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Soil Carbon Stabilization to Mitigate Climate Change

Abstract

Fixation of carbon dioxide (CO2) for the production of organic compounds is carried out globally by microbes. These microbes provide food for the survival of heterotrophs in terms of organic C through CO2 fixation. The most familiar pathway of carbon (C) fixation is Calvin–Benson–Bassham cycle. This pathway is adopted by plants, microbes, and algae for inorganic C fixation in natural environment. However, there are a number of other pathways as well that are specifically adopted by microbes for C fixation. By adopting these pathways, microbes follow diversified chemical and biochemical strategies. This chapter is providing basic knowledge about the fixation of CO2 by microbes, mechanism involved in the fixation of CO2, and the enzymes which regulate these mechanisms. Five major pathways, i.e., Calvin-Benson-Bassham cycle, reductive tricarboxylic acid cycle, 3-hydroxypropionic acid (3-HP) cycle, reductive acetyl-CoA (rACo) pathway, and carboxylases, are discussed in this chapter. Four C-fixing pathway enzymes have been described in the chapter. In the near future, it is expected that new pathways will also be established due to number and diversity of microorganisms.

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Abbreviations

3-HP:

3-Hydroxypropionic acid

3-HP:

3-Hydroxypropionic acid

3-PGA:

3 Phosphoglyceric acid

acetyl-CoA:

Acetyl-coenzyme A

AMF:

Arbuscular mycorrhiza fungi

ATP:

Adenosine triphosphate

HCO3−:

Bicarbonates ion

CBB:

Calvin-Benson-Bassham cycle

C:

Carbon

CO2:

Carbon dioxide

CCL:

Citryl-CoA lyase

GT:

Giga ton

G3P:

Glyceraldehyde 3-phosphate

kDa:

Kilodalton

NADPH:

Nicotinamide adenine dinucleotide phosphate

Pi:

Phosphate

FADH2:

Reduced flavin adenine dinucleotide

rACo:

Reductive acetyl-CoA

rTCA:

Reductive tricarboxylic acid cycle

RuBisCO:

Ribulose-1,5-bisphosphate carboxylase/oxygenase

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Danish, S. et al. (2021). Role of Soil Microbes and Their Cell Components in Carbon Stabilization. In: Datta, R., Meena, R.S. (eds) Soil Carbon Stabilization to Mitigate Climate Change. Springer, Singapore. https://doi.org/10.1007/978-981-33-6765-4_5

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