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Agriculturally Important Microorganisms

In order to survive in the dynamic environmental conditions with rapidly changing nutrient levels and cope up with tough challenges from other biological counterparts, microbes have evolved versatile metabolic machinery. Due to their metabolic diversity, microbes have the potential to enhance plant growth through making unavailable nutrients available to plants or producing growth enhancing compounds or protecting plants from pathogens through production of antimicrobial metabolites.

Plant growth promoting trait

Example of bacteria

Nitrogen fixation

Symbiotic:  Rhizobium, Bradyrhizobium,Mesorhizobium, Nostoc, Anabaena etc.
Free living: Kleibsiella, Azotobacter etc.
Associative: Azospirillum

Phyto-hormone producetion

Indole acetic acid: Acetobacter diazotrophicus, Herbaspirillum seropedicae, Bacillus pumilus, Bacillus licheniformis, Rhizobium phaseoli, Pseudomonas spp.
Cytokinin:  Rhizobium leguminosarum, Pseudomonas fluorescens, Paenibacillus polymyxa
Gibberellic acid (GA3):  Azospirillum lipoferum, Bacillus sp.
Abscisic acid (ABA):  Azospirillum brasilens

Mineral Phosphate solubilzation

Bacillus megaterium, Pseudomonas striata, Pantoea dispersa, Enterobacter spp., Serratia sp., Flavobacterium sp., Microbacterium sp., Aspergillus sp., Penicillium sp. etc.

Siderophore production

Pseudomonas fluorescens, Ochrobactrum sp. etc.

ACC deaminase production

Achromobacter sp., Azospirillum sp., Bacillus sp., Enterobacter sp., Pseudomonas spp., Rhizobium sp. etc.

K solubilization

Bacillus pumilus

Biological control of plant pathogens

Pseudomonas fluorescens, Bacillus amyloliquefaciens, Bacillus licheniformis, Pseudomonas aeruginosa, Enterobacter sp., Trichoderma spp. etc.

Biological control of plant infesting insect pests

Bacillus thuringiensis, Bacillus kurstaki

 
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