Abstract
Pythium porphyrae is a fungal pathogen responsible for red rot disease of the seaweed Porphyra (Rhodophyta). Infection forecasts of Porphyra by P. porphyrae were estimated from the epidemiological observations of Porphyra thalli and numbers of zoospore of P. porphyrae in laboratory and cultivation areas. Four features of forecasting infections were determined by relating zoospore concentrations to the incidence of thallus infection; infection (in more than 1000 zoospores L−1), microscopic infection [less than 2 mm in diameter of lesion (in from 2000 to 3000 zoospores L−1)], macroscopic infection [more than 2 mm in diameter of lesion (in from 3000 to 4000 zoospores L−1), and thallus disintegration (in more than 4000 zoospores L−1). High zoospore concentrations led to more infection. The tendency that zoospore concentration of P. porphyrae increased with the rate of infection of Porphyra thalli was generally observed in forecasting infections in both the laboratory and in cultivation areas. Based on the Porphyra cultivation areas, the accuracy and consistency of forecasting infections suggest that this method could be employed to manage and control red rot disease.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Amano H, Sakaguchi K, Maegawa M, Noda H (1996) The use of a monoclonal antibody for the detection of fungal parasite, Pythium sp., the causative organism of red rot disease, in seawater from Porphyra cultivation farms. Fish. Sci. 62: 556–560.
Amano H, Suginaga R, Arashima K, Noda H (1995) Immunological detection of the fungal parasite, Pythium sp.; the causative organism of red rot disease in Porphyra yezoensis. J. Appl. Phycol. 7: 53–58.
Arasaki S (1947) Studies on red rot of Porphyra tenera. Nippon Suisan Gakkaishi 13: 74–90.
Arasaki S, Akino K, Tomiyama T (1968) A comparison of some physiological aspects in a marine Pythium on the host and on the artificial medium. Bulletin of Misaki Marine Biology Institute of Kyoto University 12: 203–206.
Arashima K, Amano H, Suginaga R, Noda H (1994) Preparation of monoclonal antibodies against the fungal parasite, Pythium sp., the causative organism of laver red rot. Fish. Sci. 60: 481–482.
Fujita Y (1990) Introduction to Applied Phycology. In Akatsuka I, Sheath R.G (eds.), Diseases of cultivation Porphyra in Japan. SPB Academic Publishing, The Netherlands: 177–190.
Fujita Y, Zenitani B (1977) Studies on pathogenic Pythium of laver red rot in Ariake Sea farm-II. Experimental conditions and nutritional requirements for growth. Nippon Suisan Gakkaishi 43: 89–95.
Kato S, Watanabe T, Sato Y (1973) Studies on the diseases of cultural Porphyra-VII. A comparison of physiological properties among the different isolates of the causal fungus of the red wasting disease. Nippon Suisan Gakkaishi 39: 859–865.
Kerwin JL, Johnson LM, Whisler HC, Thininga AR (1992) Infection and morphologensis of Pythium marinum in species of Porphyra and other red algae. Can. J. Bot. 70: 1017–1024.
Park CS, Kakinuma M, Amano H (2001a) Detection and quantitative analysis of zoospores of Pythium porphyrae, causative organism of red rot disease in Porphyra, by competitive PCR. J. Appl. Phycol. 13: 433–441.
Park CS, Kakinuma M, Amano H (2001b) Detection of red rot disease fungi Pythium spp. by polymerase chain reaction. Fish. Sci. 67: 197–199.
Sakaguchi K, Park CS, Kakinuma M, Amano H (2001) Effects of varying temperature, salinity, and acidity in the treatment of Porphyra infected by red rot disease. Suisanzoshoku 49: 77–83.
Sasaki M, Sato S (1969) Composition of medium and cultural temperature of Pythium sp., a pathogenic fungus, of the ‘Akagusare’ disease of cultivated Porphyra. Bulletin of Tohoku Region National Fisheries Research Institute 29: 125–132.
Uppalapati SR, Fujita Y (2000) Carbohydrate regulation of attachment, encystment, and appressorium formation by Pythium porphyrae (Oomycota) zoospores on Porphyra yezoensis (Rhodophyta). J. Phycol. 36: 359–366.
Uppalapati SR, Fujita Y (2001) The relative resistance of Porphyra species (Banggiales, Rhodophyta) to infection by Pythium porphyrae (Peronosporales, Oomycota). Bot. Mar. 44: 1–7.
Uppalapati SR, Kerwin JL, Fujita Y (2001) Epifluorescence and scanning electron microscopy of host-pathogen interactions between Pythium porphyrae (Peronosporales, Oomycota) and Porphyra yezoensis (Bangiales, Rhodophyta). Bot. Mar. 44: 139–145.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Park, C.S., Kakinuma, M. & Amano, H. Forecasting infections of the red rot disease on Porphyra yezoensis Ueda (Rhodophyta) cultivation farms. J Appl Phycol 18, 295–299 (2006). https://doi.org/10.1007/s10811-006-9031-0
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10811-006-9031-0