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On the formation of physiologic races in plant parasites

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Abstract

New physiologic races can be produced by mutation, hybridization or heterokaryosis. The genetics of the host parasite relationship can be explained on the basis of the gene-for-gene hypothesis of Flor.

Resistance breeding is an important agent in the appearance of a new race and in the evolution of pathogenicity.

In America the resistance breeding in wheat is conducted along the following lines:

  1. 1.

    Searching for sources of resistance by testing collections of varieties and hybrids.

  2. 2.

    Crossing good agricultural varieties (recurrent parents) with resistant parents and making subsequent backcrosses of the hybrids with the recurrent parents. In this way lines are developed which are similar in many characters but different in their genetic constitution as concerns the resistant genes.

  3. 3.

    This program executed several procedures can be applied:

  1. a.

    Production of resistant substitution lines which can replace varieties having lost their resistance.

  2. b.

    Production of multiline varieties composed of lines differing in their genes for resistance.

  3. c.

    Distributionof resistance genes over the agricultural regions so that every district has its own type of resistance.

The author considers it desirable to adapt these procedures to European situations. For Europe the most suitable application of the new aspects seems to be the multiline variety.

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References

General reading

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Authors and Affiliations

  1. Institute of Phytopathological Research (I.P.O.), Wageningen, The Netherlands

    J. C. Zadoks

  2. Laboratory of Phytopathology of the Agricultural University, Wageningen, The Netherlands

    J. C. Zadoks

Authors
  1. J. C. Zadoks
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Additional information

Lecture held at the 2nd Eucarpia Congres, section Cereals, July 1959 at Cologne.

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Zadoks, J.C. On the formation of physiologic races in plant parasites. Euphytica 8, 104–116 (1959). https://doi.org/10.1007/BF00022427

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  • DOI: https://doi.org/10.1007/BF00022427

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