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Surface Hydrophobicity and Surface Rigidity Induce Spore Germination in Colletotrichum graminicola

June 2001 , Volume 91 , Number  6
Pages  558 - 564

J. Chaky , K. Anderson , M. Moss , and L. Vaillancourt

First and fourth authors: Department of Plant Pathology, Agricultural Science Center - North, University of Kentucky, Lexington 40546; and second and third authors: Department of Chemical and Materials Engineering, Anderson Hall, University of Kentucky, Lexington 40546

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Accepted for publication 20 February 2001.

We investigated the relationship between physical characteristics of artificial surfaces, spore attachment, and spore germination in Colletotrichum graminicola. Surface hydrophobicity and surface rigidity were both signals for breaking dormancy and initiating spore germination, but spore attachment alone was not an important inducing signal. The presence of a carbon source overrode the necessity for a rigid, hydrophobic substrate for spore germination. Spore attachment was typically stronger to more hydrophobic surfaces, but certain hydrophilic surfaces also proved to be good substrates for spore attachment. In contrast to spore germination, appressorial induction was more dependent on attachment to a rigid substrate than it was on surface hydrophobicity. Appressoria were induced efficiently on hydrophilic surfaces, as long as there was significant conidial attachment to those surfaces.

Additional keywords: corn anthracnose , Glomerella graminicola .

The American Phytopathological Society, 2001