Regulatory role of external calcium on Pythium porphyrae (Oomycota) zoospore release,development and infection in causing red rot disease of Porphyra yezoensis (Rhodophyta) |
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Authors: | Addepalli M K Fujita Yuji |
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Affiliation: | Department of Microbiology, College of Natural Sciences, Chungnam National University, Daejeon 305-764, South Korea. |
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Abstract: | Growth at the restrictive temperature (42 degrees C) of Aspergillus nidulans B120, carrying the conditional-lethal mutation sod(VI)C1, was partially improved by the addition of 1.0 M sorbitol to the medium. The mutant grown at 42 degrees C, with osmotic stabilizer, showed abnormal hyphal morphology, a decrease in beta-1,3-glucan synthase activity as well as cell wall sugar content, but an increase in chitin synthase activity and N-acetyl-glucosamine content. The mutation also affected the secretion of extracellular protease. The temperature-dependent osmo-sensitive phenotype of a Saccharomyces cerevisiae alpha-COP mutation can be rescued by the A. nidulans sod(VI)C(+) gene. These results indicate that the sod(VI)C1 mutation affects proper processing of secretory proteins destined for the surface of cells or beyond. |
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Keywords: | sodVIC1 mutation Osmo-remediable Cell wall biogenesis Protein secretion Aspergillus nidulans |
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