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Evidence of Natural Selection for Disease Resistance in Composite Cross Five (CCV) of Barley

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Abstract

Cambridge Composite Cross Five (CCV) of barley was studied utilising hordeins, restriction fragment length polymorphisms (RFLPs) and reaction to powdery mildew with a view to understanding the genetic changes occurring in the population. Changes in the frequency of individual hordein patterns as well as pattern combinations showed directional trends in successive generations in three parallel populations maintained as discrete populations since 1977 in Cambridge. Certain hordein pattern combinations were more common in the resistance classes and there was a strong association between hordein patterns and mildew reaction. RFLP analysis revealed that 80% of a random sample taken from generation F24 of Population I had the same restriction pattern as that of the cultivar Algerian, which was one of the original 30 parental lines of CCV. This cultivar is the source of the Mla1 allele in barley improvement programmes in Europe. We argue, based on supporting evidence from hordein analysis and tests of reaction to selected mildew isolates of known virulence isolates together with UK virulence surveys, that selection for Mla1 in Cambridge has been the predominant evolutionary force in CCV in Cambridge.

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Authors and Affiliations

  1. Department of Crop Science, University of Ghana, P.O. Box LG 44, Legon, Ghana (Fax

    E.Y. Danquah

  2. Department of Genetics, Cambridge University, Downing Street, Cambridge, CB2 3EH, UK

    J.A. Barrett

Authors
  1. E.Y. Danquah
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  2. J.A. Barrett
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Danquah, E., Barrett, J. Evidence of Natural Selection for Disease Resistance in Composite Cross Five (CCV) of Barley. Genetica 115, 195–203 (2002). https://doi.org/10.1023/A:1020178310448

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