1887

Abstract

The putative homologue of the stretch-activated calcium ion channel Mid1 was investigated for its role in vegetative growth, differentiation and pathogenicity on rye (). Gene replacement mutants of were not affected in polar growth and branching in axenic culture but showed a significantly reduced growth rate. The growth defect could not be complemented by Ca supplementation, in contrast to mutants in yeast, but the altered sensitivity of the mutants to changes in external and internal Ca concentrations indicates some role of Mid1 in Ca homeostasis. The major effect of deletion, however, was the complete loss of virulence: infected rye plants showed no disease symptoms at all. Detailed analyses of -infected rye ovaries demonstrated that the Δ mutants had multiple apical branches and were unable to infect the host tissue, suggesting that Mid1 is essential for generating the necessary mechanical force for penetration. This is believed to be the first report of an essential role for a Mid1 homologue in the virulence of a plant-pathogenic fungus.

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2009-12-01
2020-06-02
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