Plant and Soil

, Volume 102, Issue 1, pp 127–129 | Cite as

Composition ofAzospirillum species associated with wetland rice plant grown in different soils

  • J. K. Ladha
  • R. B. So
  • I. Watanabe
Short Communications


Total aerobic heterotrophs and N2-fixing putative azospirilla associated with rice plant grown in long-term unfertilized wetland rice field at 5 sites in the Philippines were enumerated. Several azospirilla isolates were identified based on cellular morphology, biochemical tests and reaction to immunodiffusion. Azospirilla constitute about one percent of the total aerobic heterotrophs. Most (85%) of the Azospirillum isolates belong toA. lipoferum indicating its preferential colonization to the rice plant.

Key words

aerobic heterotrophs Azospirillum wetland rice 


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Copyright information

© Martinus Nijhoff Publishers 1987

Authors and Affiliations

  • J. K. Ladha
    • 1
  • R. B. So
    • 1
  • I. Watanabe
    • 1
  1. 1.The International Rice Research InstituteLos Baños, LagunaPhilippines

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