Identification test for RHIZOBIUM - Biology Forum

last updated by

aashimalhotra 16 years, 2 months ago

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- June 3, 2008 at 3:57 pm #9715
  aashimalhotra
  Participant
  hi everyone…..
  does anyone of you have a clue so as to identify a given bacteria as rhizobium?
  i require this test in my project.
  please help me out.
- June 4, 2008 at 10:20 am #84449
  victor
  Participant
  just inoculate the mixture/suspension of the root node extract into YEMA (yeast extract mannitol agar) medium added with some kinda of indicator dye (if I’m not mistaken is Congo Red). Then after 48-72h there’ll be some colonies there. Rhizobium colonies are the colonies that absorb the red pigment surrounding them. You’ll also find another colonies that do not absorb red pigment but do produce slimy layer. Well that’s Azotobacter’s colony.
  Hope this helps
  Victor
- September 26, 2008 at 4:24 pm #86115
  aashimalhotra
  Participant
  could any one send me pictures of rhizobium on YEMA plate. with congo red dye. or tell me about those links where i could find some.
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