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Identification test for RHIZOBIUM

About microscopic forms of life, including Bacteria, Archea, protozoans, algae and fungi. Topics relating to viruses, viroids and prions also belong here.

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Identification test for RHIZOBIUM

Postby aashimalhotra » Tue Jun 03, 2008 3:57 pm

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.
aashimalhotra
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Postby victor » Wed Jun 04, 2008 10:20 am

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
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Postby aashimalhotra » Fri Sep 26, 2008 4:24 pm

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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