Races of rust (Puccinia antirrhini) of <i>Antirrhinum majus</i> and the inheritance of host resistance

Aitken, E. A. B.; Newbury, H. J.; Callow, James A.

doi:10.1111/j.1365-3059.1989.tb02130.x

Cited by 5 publications

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“…Temperature has been shown to influence the rate of movement of some Antinhinum transposons (Harrison and Carpenter, 1973;Luo et al, 1991) with Tam3, for example, moving 1000-fold more frequently at 15°C than at 25°C. We have previously reported the identification of two races of Antinhinum rust and resistance to race a was shown to be inherited in a manner consistent with the existence of a single, dominant R gene (Aitken et a/., 1989). The difference between a resistant and a susceptible response is also extremely clear.…”

Section: Introductionmentioning

confidence: 93%

Mutagenesis of a race‐specific rust resistance gene in Antirrhinum majus using a transposon‐tagging protocol

1992

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SummaryIn a transposon tagging experiment, lines of Antimhinum majus exhibiting both race-specific resistance (homozygous for the dominant R gene) to the rust pathogen Puccinia antinhiniand a high frequency of transposition were crossed with homozygous susceptible lines. From a screen of 11 153 F, progeny, 15 individuals were detected showing susceptibility to rust race a. Six of these exhibited a susceptibility phenotype (classified as type B) not previously observed. A control experiment involving the same tagging strategy but employing lines that do not exhibit high rates of transposition did not yield any susceptible mutants from a screen of 6243 progeny. In experiments on the heritability and stability of the mutation, the six plants exhibiting susceptibility phenotype B produced progeny in which the R locus had reverted to an active form (i.e. some of the progeny were resistant), a classic characteristic of transposontagged plant genes. Reversion was shown to occur somatically, and its rate was temperature dependent. Inheritance studies showed that the mutations in two of the susceptible plants from the tagging protocol map at, or very close to, the race a-specific resistance gene. The results are consistent with the transposon tagging of a race-specific gene for rust resistance.

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Section: Introductionmentioning

confidence: 93%