, Volume 52, Issue 3, pp 213–216 | Cite as

New records of microcyclic conidiogenesis in some powdery mildew fungi

  • Alexandra Pintye
  • Sara Elisabetta Legler
  • Levente KissEmail author


Microcyclic conidiogenesis (MC) was recently described in several species of powdery mildew fungi. This process, defined as the production of conidia on a fungal spore without any, or only a minimal, involvement of hyphal growth, was observed on powdery mildew conidia that have already germinated on host plant surfaces and have been attached to the epidermal cells. Most probably, MC contributes to a quick propagation of young powdery mildew colonies because new conidia are sometimes produced in a shorter time on microcyclic conidiophores than on the hyphae of the young mycelium. This article reports MC in Erysiphe necator ex grapevine, Podosphaera leucotricha ex apple, Golovinomyces orontii ex tobacco, and Neoerysiphe galeopsidis ex Lamium purpureum based on light and low-temperature scanning electron microscopic studies.


Conidial germination Erysiphales Erysiphaceae Microcyclic conidiation 



This work was supported by a grant (OTKA K73565) of the Hungarian Scientific Research Fund and also by a Hungarian-Italian intergovernmental collaborative project (IT-33/07). The LT-SEM work was performed with Dr. Evi Bieler in the ZMB Laboratory, University of Basel, Switzerland, as a part of a collaboration with Dr. Hanns-Heinz Kassemeyer (Staatliches Weinbauinstitut Freiburg, Germany).


  1. Ahearn DG, Price D, Simmons RB, Mayo A, Zhang ST, Crow SA Jr (2007) Microcycle conidiation and medusa head conidiophores of aspergilli on indoor construction materials and air filters from hospitals. Mycologia 99:1–6CrossRefGoogle Scholar
  2. Anderson JG, Smith JE (1971) The production of conidiophores and conidia by newly germinated conidia of Aspergillus niger (microcycle conidiation). J Gen Microbiol 69:185–197PubMedGoogle Scholar
  3. Bacon CW, Hinton DM (1991) Microcyclic conidiation cycles in Epichloe typhina. Mycologia 83:743–751CrossRefGoogle Scholar
  4. Bolay A (2005) Les Oidiums de Suisse. Cryptogam Helv 20:1–176Google Scholar
  5. Bosch A, Yantorno O (1999) Microcycle conidiation in the entomopathogenic fungus Beauveria bassiana Bals. (Vuill.). Process Biochem 34:707–716CrossRefGoogle Scholar
  6. Braun U (1987) A monograph of the Erysiphales (powdery mildews). Beih Nova Hedwigia 89:1–700Google Scholar
  7. Cascino JJ, Harris RF, Smith CS, Andrews JH (1990) Spore yield and microcycle conidiation of Colletotrichum gloeosporioides in liquid culture. Appl Environ Microbiol 56:2303–2310PubMedGoogle Scholar
  8. Cook RTA, Braun U (2009) Conidial germination patterns in powdery mildews. Mycol Res 113:616–636PubMedCrossRefGoogle Scholar
  9. Green JR, Carver TLW, Gurr SJ (2002) The formation and function of infection and feeding structures. In: Bélanger RR, Bushnell WR, Dik AJ, Carver TLW (eds) The powdery mildews: a comprehensive treatise. American Phytopathological Society (APS), St. Paul, pp 66–82Google Scholar
  10. Hanlin RT (1994) Microcycle conidiation: a review. Mycoscience 35:113–123CrossRefGoogle Scholar
  11. Kiss L, Jankovics T, Kovács GM, Daughtrey ML (2008) Oidium longipes, a new powdery mildew fungus on petunia in the USA: a potential threat to ornamental and vegetable solanaceous crops. Plant Dis 92:818–825CrossRefGoogle Scholar
  12. Kiss L, Pintye A, Zséli G, Jankovics T, Szentiványi O, Hafez YM, Cook RTA (2010) Microcyclic conidiogenesis in powdery mildews and its association with intracellular parasitism by Ampelomyces. Eur J Plant Pathol 126:445–451CrossRefGoogle Scholar
  13. Krasniewski I, Molimard P, Feron G, Vergoignan C, Durand A, Cavin JF, Cotton P (2006) Impact of solid medium composition on the conidiation in Penicillium camemberti. Process Biochem 41:1318–1324CrossRefGoogle Scholar
  14. Lapaire CL, Dunkle LD (2003) Microcycle conidiation in Cercospora zeae-maydis. Phytopathology 93:193–199PubMedCrossRefGoogle Scholar
  15. Maheshwari R (1999) Microconidia of Neurospora crassa. Fungal Genet Biol 26:1–18PubMedCrossRefGoogle Scholar
  16. Rügner A, Rumbolz J, Huber B, Bleyer G, Gisi U, Kassemeyer H-H, Guggenheim R (2002) Formation of overwintering structures of Uncinula necator and colonisation of grapevine under field conditions. Plant Pathol 51:322–330CrossRefGoogle Scholar
  17. Shin HD, La Y (1993) Morphology of edge lines of chained immature conidia on conidiophores in powdery mildew fungi and their taxonomic significance. Mycotaxon 46:445–451Google Scholar
  18. Takamatsu S, Havrylenko M, Wolcan SM, Matsuda S, Niinomi S (2008) Molecular phylogeny and evolution of the genus Neoerysiphe (Erysiphaceae, Ascomycota). Mycol Res 112:639–649PubMedCrossRefGoogle Scholar

Copyright information

© The Mycological Society of Japan and Springer 2010

Authors and Affiliations

  • Alexandra Pintye
    • 1
  • Sara Elisabetta Legler
    • 2
  • Levente Kiss
    • 1
    Email author
  1. 1.Plant Protection Institute of the Hungarian Academy of SciencesBudapestHungary
  2. 2.Istituto di Entomologia e Patologia VegetaleUniversità Cattolica del Sacro CuorePiacenzaItaly

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