, Volume 162, Issue 1, pp 23–30 | Cite as

A differential series of pepper (Capsicum annuum) lines delineates fourteen physiological races of Phytophthora capsici

Physiological races of P. capsici in pepper
  • Bonnie R. Glosier
  • Ebenezer A. Ogundiwin
  • Gurmel S. Sidhu
  • David R. Sischo
  • James P. Prince


The study of the genetics of resistance in pepper to the oomycete pathogen Phytophthora capsici has been complicated due to a lack of use of a common set of pathogen isolates and host genotypes. We have developed a differential series for this system using eleven pepper genotypes and thirty-four isolates of the pathogen from California, New Mexico, North Carolina, and Turkey. Through differential patterns of virulence of the isolates on the hosts, we identified fourteen different physiological races of P. capsici. There appears to be no restriction of races to particular geographical locations. Isolate mating types were also determined, and both mating types were found in one field in California. The significance of the characterization of physiological races and existence of both mating types in the field to pepper growers and breeders is discussed.


Pepper root and stem rot Disease resistance 



We would like to thank T. Day, M. Coffey, J. Ristaino, and P. Bosland for providing isolates of P. capsici, C. Sandlin, M. Massoudi, T. Berke, and K. Sakamoto for providing pepper accessions, J. Stebbins for greenhouse assistance, R. Heisey for advice on setting up the seedling screen, and J. Farrar for helpful comments throughout this project and critical reading of this manuscript. This work was supported by NIH-MBRS-SCORE, the California Pepper Commission, the CSU Agricultural Research Initiative (CSU-ARI), and the CSU Fresno College of Science and Mathematics.


  1. Barksdale TH, Papavizas GC, Johnston SA (1984) Resistance to foliar blight and crown rot of pepper caused by Phytophthora capsici. Plant Dis 68:506–509CrossRefGoogle Scholar
  2. Bosland PW, Lindsey DL (1991) A seedling screen for Phytophthora root rot of pepper, Capsicum annuum. Plant Dis 75:1048–1050CrossRefGoogle Scholar
  3. Engel SR, Descenzo RA, Irelan NA (2000) US patent #6,080,543. E & J Gallo Winery, Modesto, CA, June 27Google Scholar
  4. Erwin DC (1983) Variability within and among species of Phytophthora. In: Erwin DC, Bartnicki-Garcia S, Tsao PH (eds) Phytophthora: its biology, taxonomy, ecology and pathology. American Pathological Society, St. Paul, MNGoogle Scholar
  5. Erwin DC, Ribeiro OK (1996) Phytophthora diseases worldwide. American Phytopathological Society, St. Paul, MNGoogle Scholar
  6. Jeffers SN, Martin SB (1986) Comparison of two media selective for Phytophthora and Pythium species. Plant Dis 70:1038–1043CrossRefGoogle Scholar
  7. Lamour KH, Hausbeck MK (2000) Mefenoxam insensitivity and the sexual stage of Phytophthora capsici in Michigan cucurbit fields. Phytopathology 90:396–400CrossRefPubMedGoogle Scholar
  8. Lamour KH, Hausbeck MK (2001) The dynamics of mefenoxam insensitivity in a recombining population of Phytophthora capsici characterized with amplified fragment length polymorphism markers. Phytopathology 91:553–557CrossRefPubMedGoogle Scholar
  9. Lefebvre V, Palloix A (1996) Both epistatic and additive effects of QTLs are involved in polygenic induced resistance to disease: a case study, the interaction pepper-Phytophthora capsici Leonian. Theor Appl Genet 93:503–511CrossRefGoogle Scholar
  10. Leonian LH (1922) Stem and fruit blight of peppers caused by Phytophthora capsici. Phytopathology 12:401–408Google Scholar
  11. Oelke LM, Bosland PW, Steiner R (2003) Differentiation of race specific resistance to Phytophthora root rot and foliar blight in Capsicum annuum. J Am Soc Hortic Sci 128:213–218Google Scholar
  12. Ogundiwin EA, Berke TF, Massoudi MA, Black LL, Huestis G, Choi D, Lee S, Prince JP (2005) Construction of 2 intraspecific linkage maps and identification of resistance QTLs for Phytophthora capsici root-rot and foliar-blight diseases of pepper (Capsicum annuum L.). Genome 48:698–711PubMedCrossRefGoogle Scholar
  13. Ortega RG, Espanol CP, Zueco JC (1992) Genetic relationships among four pepper genotypes resistant to Phytophthora capsici. Plant Breeding 108:118–125CrossRefGoogle Scholar
  14. Person C, Sidhu G (1971) Genetics of host-parasite interrelationships. In: Mutation breeding for disease resistance. International Atomic Energy Agency, ViennaGoogle Scholar
  15. Reifschneider FJB, Boiteux LS, Vecchia PT, Poulos JM, Kuroda N (1992) Inheritance of adult-plant resistance to Phytophthora capsici in pepper. Euphytica 62:45–49CrossRefGoogle Scholar
  16. Ribeiro OK (1978) A source book for the genus Phytophthora. Strauss and Cramer GmBH, GermanyGoogle Scholar
  17. Ristaino JB, Madritch M, Trout C, Parra G (1998) PCR amplification of ribosomal DNA for species identification in the plant pathogen genus Phytophthora. Appl Environ Microbiol 64(3):948–954PubMedGoogle Scholar
  18. Tyler BM (2002) Molecular basis of recognition between Phytophthora pathogens and their hosts. Ann Rev Phytopath 40:137–167CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Bonnie R. Glosier
    • 1
  • Ebenezer A. Ogundiwin
    • 1
    • 2
  • Gurmel S. Sidhu
    • 1
  • David R. Sischo
    • 1
  • James P. Prince
    • 1
  1. 1.Department of BiologyCalifornia State University FresnoFresnoUSA
  2. 2.University of California – Davis, Kearney Agricultural CenterParlierUSA

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