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Blue-Green Algae: A Brief Introduction to the Prokaryotic Photosynthesizers  : Plantlet

  • Blue green algae (BGA) are photosynthetic prokaryotic, simplest, living autotrophic (organisms capable of building up food materials from inorganic matter) micro-organisms.
  • Blue Green Algae (BGA) or Cyanobacteria have the ability to carry out both photosynthesis as well as nitrogen fixation.
  • They belong to the order Nostocales and Stigonematales.

The standing water of rice field encourages the growth of Blue Green Algae (BGA). These different species of BGA are:

  1. Anabaena
  2. Aulosira
  3. Nostoc
  4. Tolypothrix
  5. Haplosiphon
  6. Others



➢ Carry out both photosynthesis as well as nitrogen fixation (20-30 kg/ha/year). Add organic matter.

➢ Antifungal, insecticidal, nematocidal, cytotoxic.

➢ Anabaena azollae is nitrogen fixing symbiotic habitant of a tiny water fern azolla.

➢ Besides they excrete vitamin B12, auxins, AA and ascorbic acid increase available phosphorus in the soil.

➢ Increase WHC, aggregation, Permeability and exchangeable Ca.

➢ reclamation of Saline-alkali soils

➢ Release oxygen for the paddy roots, Converts Fe++ to Fe+++.

➢ Effective only in submergence rice and demands bright sunshine

➢ Algal mat in paddy fields also protects loss of moisture from the soil.


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