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In planta and in vitro interactions between Phomopsis (Diaporthe) isolates and sunflower

Author

Listed:
  • A.M. Pennisi

    (degli Studi Mediterranea di Reggio Calabria, 89061 Gallina, Reggio Calabria, Italy)

  • M.R. Abenavoli

    (degli Studi Mediterranea di Reggio Calabria, 89061 Gallina, Reggio Calabria, Italy)

  • B. Maimone

    (degli Studi Mediterranea di Reggio Calabria, 89061 Gallina, Reggio Calabria, Italy)

  • L. Di Dio

    (degli Studi Mediterranea di Reggio Calabria, 89061 Gallina, Reggio Calabria, Italy)

Abstract

In this study, we determined the amount of H2O2 released by sunflower callus cultures challenged by both crude hyphal wall extracts and culture filtrates of 26 Phomopsis isolates from sunflower of worldwide origin (Argentina, France, Italy, Yugoslavia, Rumania). The amount of H2O2 released by callus cultures and the production time-course response, however, did not correlate with both the amount of electrolytes released by sunflower leaf disks treated with crude culture filtrates and the results of pathogenicity tests on sunflower seedlings. Only few isolates induced a time-course response indicative of an oxidative burst. This would suggest that elicitors extracted from hyphal walls are not involved in this host-pathogen recognition system and toxic metabolites produced by Phomopsis in liquid cultures are not pathogenicity factors.

Suggested Citation

  • A.M. Pennisi & M.R. Abenavoli & B. Maimone & L. Di Dio, 2002. "In planta and in vitro interactions between Phomopsis (Diaporthe) isolates and sunflower," Plant Protection Science, Czech Academy of Agricultural Sciences, vol. 38(SI2-6thCo), pages 461-465.
    • Handle: RePEc:caa:jnlpps:v:38:y:2002:i:si2-6thconfefpp:id:10524-pps
    DOI: 10.17221/10524-PPS
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