Ultrastructure and properties of Paecilomyces lilacinus spores

R. J. Holland*, T. S. Gunasekera, K. L. Williams, K. M. H. Nevalainen

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)


    Strains of the filamentous soil fungus Paecilomyces lilacinus are currently being developed for use as biological control agents against root-knot, cyst, and other plant-parasitic nematodes. The inoculum applied in the field consists mainly of spores. This study was undertaken to examine the size, ultrastructure, and rodlet layers of P. lilacinus spores and the effect of the culture method on structural and functional spore properties. A rodlet layer was identified on aerial spores only. Other differences noted between aerial spores and those produced in submerged culture included the size and appearance of spores and thickness of spore coat layers when examined with transmission electron microscopy. The two spore types differed in UV tolerance, with aerial spores being less sensitive to environmentally relevant UV radiation. Also, viability after drying and storage was better with the aerial spores. Both spore types exhibited similar nematophagous ability.

    Original languageEnglish
    Pages (from-to)879-885
    Number of pages7
    JournalCanadian Journal of Microbiology
    Issue number10
    Publication statusPublished - 1 Oct 2002


    • biological control
    • fungal spores
    • Paecilomyces lilacinus
    • rodlet layer
    • spore ultrastructure
    • UV sensitivity


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