Bacillus megaterium (Phosphate Solubilising Bacteria)

Importance of Phosphorous
An adequate supply of phosphorus during early phases of plant development is important for laying down the primordia of plant reproductive parts. It plays significant role in increasing root ramification and strength thereby imparting vitality and disease resistance capacity to plant. It also helps in seed formation and in early maturation of crops like cereals and legumes. Poor availability or deficiency of phosphorus (P) markedly reduces plant size and growth. Phosphorus accounts about 0.2 – 0.8% of the plant dry weight.

Symptoms of Phosphorous Deficiency
The plants are usually dark bluish-green in color with leaves and stem becoming purplish. The degree of purple is influenced by the genetic makeup of the plant, with some hybrids showing much greater discoloration than others. The purplish colour is due to accumulation of sugars that favours the synthesis of anthocyanin (a purplish-colored pigment), which occurs in the leaves of the plant.

The principal mechanism for mineral phosphate solubilization is the production of organic acids; acid phosphatases play a major role in the mineralization of organic phosphorous in soil. The use of phosphate solubilizing bacteria as inoculant simultaneously increases P uptake by the plant and crop yield.

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