Somatic hybridization in the Uredinales.

@article{Park2012SomaticHI,
  title={Somatic hybridization in the Uredinales.},
  author={Robert F. Park and Colin R. Wellings},
  journal={Annual review of phytopathology},
  year={2012},
  volume={50},
  pages={
          219-39
        }
}
Rust fungi are cosmopolitan in distribution and parasitize a wide range of plants, including economically important crop species such as wheat. Detailed regional, national, and continental surveys of pathogenic variability in wheat-attacking rust pathogens over periods of up to 90 years have shown that in the absence of sexual recombination, genetic diversity is generated by periodic introduction of exotic isolates, single-step mutation, and somatic hybridization. Laboratory studies have… 

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...

References

SHOWING 1-10 OF 94 REFERENCES

Isozyme analysis indicates that a virulent cereal rust pathogen is a somatic hybrid

Somatic hybridization between formae speciales or different strains of the same forma specialis of cereal rusts has often been implicated in the origin of new virulence combinations1–3. It has been

Obligate biotrophy features unraveled by the genomic analysis of rust fungi

The dramatic up-regulation of transcripts coding for small secreted proteins, secreted hydrolytic enzymes, and transporters in planta suggests that they play a role in host infection and nutrient acquisition.

Interspecific hybridization in plant‐associated fungi and oomycetes: a review

This work has shown the potential for interspecific hybridization among pathogens, which results in adaptation to new niches such as new host species, and increased or decreased virulence.

Genotypic variation within a phenotype as a possible basis for somatic hybridization in rust fungi

It is generally considered that the production of new strains of rust by somatic hybridization cannot be adequately explained by hyphal anastomosis and nuclear exchange. Such a mechanism would

Obligate Biotrophy Features Unraveled by the Genomic Analysis of the Rust Fungi, Melampsora larici-populina and Puccinia graminis f. sp. tritici

The dramatic upregulation of transcripts coding for SSPs, secreted hydrolytic enzymes, and transporters in planta suggests that they play a role in host infection and nutrient acquisition.

Production of New Physiologic Races in Puccinia striiformis (Yellow Rust) by Heterokaryosis

Mutation and cytoplasmic change are possible causes of the production of new races, but it seemed to us that heterokaryosis or parasexual phenomena in the uredospore stage (both known in P. graminis) could be involved.

Population structure and diversity in sexual and asexual populations of the pathogenic fungus Melampsora lini

The population genetic structure of wild populations of the plant pathogen Melampsora lini on its host Linum marginale is investigated using amplified fragment length polymorphism (AFLP) markers, two genes underlying pathogen virulence, and phenotypic variation in virulence.

RESISTANCE IN WHEAT TO FORMAE SPECIALES TRITICI AND SECALIS OF PUCCINIA GRAMINIS

The present study indicates that hybridization between wheat stem rust and rye stem rust can be important in producing new combinations of virulence genes which can attack known genes for resistance in wheat.
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