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Avirulence Gene
The gene-for-gene relationship was discovered by Harold Henry Flor who was working with rust (''Melampsora lini'') of flax (''Linum usitatissimum''). Flor showed that the inheritance of both resistance in the host and parasite ability to cause disease is controlled by pairs of matching genes. One is a plant gene called the resistance (''R'') gene. The other is a parasite gene called the avirulence (''Avr'') gene. Plants producing a specific R gene product are resistant towards a pathogen that produces the corresponding ''Avr'' gene product. Gene-for-gene relationships are a widespread and very important aspect of plant disease resistance. Another example can be seen with ''Lactuca serriola'' versus '' Bremia lactucae''. Clayton Oscar Person was the first scientist to study plant pathosystem ratios rather than genetics ratios in host-parasite systems. In doing so, he discovered the differential interaction that is common to all gene-for-gene relationships and that is now known as t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harold Henry Flor
Harold Henry Flor known as H. H. Flor (1900–1991) was a plant pathologist famous for proposing the Gene-for-gene relationship, gene for gene hypothesis of plant-pathogen genetic interaction whilst working on rust (Melampsora lini var. lini, ''Melampsora lini'') of flax (''Linum usitatissimum''). Life and career Harold Henry Flor completed his B.S. at the University of Minnesota in 1922, and continued on to an M.S. degree there for the following two years. He received his M.S. degree in June 1924 for his research work entitled ''Control of covered smuts of small grains''. Between January 1924 and May 1925 he worked at Iowa State College as a Research Fellow and completed his work on the ''Fungicidal activity of furfural'' there. For a year between September 1925 to September 1926 he worked as a Research Fellow at the graduate school of the University of Minnesota, following which he completed a research work on root rot in sugarcane supervised by E.G. Edgerton at the State Univ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |