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  • Title: Germination polarity of Beauveria bassiana conidia and its possible correlation with virulence.
    Author: Talaei-Hassanloui R, Kharazi-pakdel A, Goettel MS, Little S, Mozaffari J.
    Journal: J Invertebr Pathol; 2007 Feb; 94(2):102-7. PubMed ID: 17097103.
    Abstract:
    Three different germination types of conidia; unidirectional, bidirectional and multidirectional, were revealed through microscopic observations for eight Beauveria bassiana isolates germinated on Sabouraud dextrose agar. Canonical correlation analysis indicated that there is a positive correlation between unidirectional germination and virulence against diamondback moth, Plutella xylostella and the Colorado potato beetle, Leptinotarsa decemlineata. Scanning electron microscopy revealed different in vivo behaviors for unipolar- and bipolar-germinated conidia. Unipolar-germinated conidia produced a strong germ tube with mostly appressorium-like structures while bipolar-germinated conidia continued to invasive hyphal growth without any penetration, indicating that germination polarity in one way or another may be an indicator of pathogenic ability.
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