Laboratory science
Reworking a 1934 tobacco mosaic experiment
Open access · cc by · source: Europe PMC
Scholthof and colleagues re-perform Holmes’s Tabasco leaf-drop assay and conclude that some historical experiments cannot be fully replicated; craft and materials matter.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
Some historical experiments cannot be fully replicated: Scholthof’s re-performance of a 1934 tobacco mosaic assay shows craft and materials matter.
Evidence for the claim as stated.
Inspect source passages
Reworking a 1934 tobacco mosaic experiment
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
Holmes’s 1934 paper was the first demonstration that a resistance gene from one species could protect another from virus infection.
The 1934 publication is important to plant pathology because it was the first demonstration that a resistance gene from one species could be used to protect another species from the ravages of virus infection
It took Holmes three years to advance the Nicotiana N-gene introgression project.
This process was fraught with difficulties in that it took Holmes three years to advance this project (Holmes, , ; Scholthof, , )
Key findings
Holmes used necrotic lesions and abscission to track a dominant resistance gene (L), later introgressed into bell pepper. The 1934 paper first showed a resistance gene moved between species. Reworking met unexpected abscission on mock-inoculated plants. Collins’s TEA-laser lesson applies: written papers do not transfer usable craft. Complementary methods and citing literature help interpret the past.
Methodology
Acting as scientist–historians in the spirit of Pamela Smith’s Making and Knowing Project, they inoculated Tabasco and California Wonder peppers with TMV, compared Holmes’s figures and later citations, and diagnosed environment, plant age, seed drift, and tacit inoculation skill.
Limitations
This is one lab’s rework, not a multi-site RCT of 1934 methods. It does not prove Holmes’s genetics wrong. Seed lots cannot be Holmes’s originals.
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