Genes Conferring Specific Plant Disease Resistance

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Science  28 Jan 1972:
Vol. 175, Issue 4020, pp. 375-380
DOI: 10.1126/science.175.4020.375


Genes conferring host resistance to an obligate parasite, grouped together in complex loci provide opportunities to study their structure. By means of an appropriate operational definition of these genes, a modified cis-trans test was used to interpret the position effects of codominant genes mutually recombined within each of two complex loci of flax, with the use of a specially developed method of analysis among F2 segregants. The different behavior of genes in the M and L groups may reflect a difference in their structure sufficient to raise important implications in the theory of specific host-parasite interactions.

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