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rhizobium senescence

Lynn Bry aj088 at FreeNet.Carleton.CA
Sat Jan 15 02:20:11 EST 1994

I  have a few questions relating to the senescence of _Rhizobium_
bacteroids in nodules. I would appreciate any info anyone can give
me ..

Is there anything that can trigger senescent bacteroids to re-enter
a state where they can fix nitrogen?

Are they killed by the plant by the time they reach zone 5 of the nodule?
Can they escape the nodule and re-enter a free-living state in the soil?

Is it possible to reisolate viable colonies from senescent bacteroids
extracted from the root nodules?

Are there any known plant signals that trigger senescence?

I can be e-mailed at  lynn at pharmdec.wustl.edu

Thanks in advance.


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