Frankia and actinorhizal plants

Don Chen chend at ucs.orst.edu
Tue Nov 7 13:14:07 EST 1995

I posted the following questions back in early Sept with no responses
except from a couple of others who were also interested.  I am
reposting in the hope that the increased traffic recently will include
responses to this.


>I have a few questions about Frankia infections of actinorhizal plants
>which arose from conversations with a friend a while back.  I am not
>in the field and she didn't know if there were answers for my
>questions.  I am posting to this group in hope someone can at least
>point me in the right directions.

>My friend said that, to date, there were no reports of Frankia, which
>had been isolated from the field, capable of reinfecting naive plants.
>She thought that this may be the result of the need for co-infection
>by other soil microbes which have not been identified.  Does anyone
>know of any studies in which isolated Frankia has been able to
>re-infect actinorhizal plants?  How about identifying other soil
>microbes which occur contemporaneously with Frankia?

>A second question area has to do with plant-microbe interactions.
>What, if any, plant receptors are involved in Frankia infections of
>plant roots?  Does infection of Frankia in one root bar infection of
>another root?  Has anyone looked at plant signals which might be
>secreted in the soil around the plant?  How does Frankia get into the

>A third area of questions has to do with in vitro testing of
>interactions.  Is it possible to work with plant callus material
>rather than whole plants?  Has anyone looked at chemical analysis of
>plants before and after infections?

>Although I am not in the field, I am curious about how microbes
>interact with host cells in order for productive infections to occur.

>Any help to sources of information will be appreciated.  If there is a
>demand for it, I will post a summary of any responses I do get.


>Don Chen

Sleeping we image what awake we wish,
         Dogs dream of bones, fishermen of fish. - Theocritus
Impoundments are another way of saying,
    "Dam the rivers, damn the fish, and goddamn you."

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