F. C. Bawden (1908-1971) was a pioneering plant pathologist and virologist based at the Rothamsted Experimental Station in
England. He and N. W. Pirie were longtime collaborators in plant virology. During 1956-57 Franklin's team studied a number
of different virus samples provided by Bawden, and elucidated their structures.
Number of Image Pages:
1 (67,560 Bytes)
1957-03-13 (March 13, 1957)
Bawden, F. C.
Rothamsted Experimental Station
Original Repository: Churchill Archives Centre. The Papers of Rosalind Franklin
Courtesy of the Churchill Archives Centre.
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From the symptoms now showing on the plants I inoculated with the virus you sent me last month, I have no reason to think
that it was anything except a preparation of normal tobacco mosaic virus. Certainly none of the plants is showing the kind
of symptoms that Holmes describes as typical of infection by the rib grass strain. Of course I am doing my tests in a different
environment, and also am using different varieties of test plants from him, hence my results are not conclusive. If you have
any quantity of the preparation left, I suggest a critical test for its identity would be to get someone to analyze it for
the amino acids that are specific to rib grass strain, for instance, histidine and methionine. Until this has been done I
think the fact that you get X-ray patterns similar to those given by the type strain TMV is readily explained by the assumption
that your rib grass is, in fact, TMV.