Immunological detection of the fungal parasite, Pythium sp.; the causative organism of red rot disease in Porphyra yezoensis

Amano, Hideomi; Suginaga, Reiko; Arashima, Koichi; Noda, Hiroyuki

doi:10.1007/bf00003550

Cited by 20 publications

(9 citation statements)

References 10 publications

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“…In both Korea and Japan, immersion of cultivation nets into an organic acid-seawater mixture is already used to control disease by Pyropia farmers (Amano et al 1995;Park et al 2006). Sakaguchi et al (2001) reported that thalli were acid Fig.…”

Section: Discussionmentioning

confidence: 99%

Effect of pH and salinity on the removal of phytal animals during summer cultivation of Sargassum fusiforme and Sargassum fulvellum in Korea

et al. 2015

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The brown seaweeds, Sargassum fusiforme and Sargassum fulvellum are edible and highly valued in Korea. During the summer season, phytal animals graze heavily on young algal blades and holdfasts of these two species and substantially reduce harvestable biomass. Acid and salinity treatments are used to efficiently control infestations by phytal animals in other cultivated algae (e.g., Pyropia), but their effects on the removal of phytal animals in Sargassum cultivation are unknown. Here we investigated the effects of pH (range 2~13) and salinity (range 0~44 psu) on the removal of two major phytal animals, Caprella scaura and Gammaropsis utinomi, associated with S. fusiforme and S. fulvellum. We also examined the optimum quantum yield (F v /F m ) of algae in the same experimental conditions to quantify the tolerance of algae to acid and salinity treatments. The two animal species experienced more than 80 % mortality at pH lower that pH 4 and the extreams of salinity (0~10 and 44 psu) after a 5-min of immersion. The quantum yield of S. fulvellum was not significantly different from controls (ambient pH and salinity) within the pH 4-10 range and within the 7-40 psu salinity range. Similarly, the quantum yield of S. fusiforme was not significantly different from controls within the pH 3-11 range and the 0-44 psu salinity range. Therefore, if pH and salinity conditions outside these ranges were used in commercial Sargassum culture, the removal of the two animal species would be higher, but quantum yield of algae would be substantially reduced. These results indicate that pH and salinity treatments could be used effectively to remove the phytal organisms without significantly affecting optimum quantum yield in S. fusiforme and S. fulvellum.

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Section: Discussionmentioning

confidence: 99%

Effect of pH and salinity on the removal of phytal animals during summer cultivation of Sargassum fusiforme and Sargassum fulvellum in Korea

et al. 2015

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“…Red rot disease (Akagusare), caused by Pythium porphyrae (Oomycetes), is one of the most destructive fungal diseases of Porphyra and can seriously reduce both yield and quality in Porphyra farms every year (Amano et al, 1995). The causative organism of this disease is spread by zoospores released into seawater.…”

Section: Introductionmentioning

confidence: 99%

Forecasting infections of the red rot disease on Porphyra yezoensis Ueda (Rhodophyta) cultivation farms

2006

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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.

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“…To find red rot disease in the early stage, polyclonal antibodies (Pabs) (Addepalli & Fujita, 2001), monoclonal antibodies (MAbs) (Amano et al, 1995;Addepalli & Fujita, 2002b) and PCR technique (Park et al, 2001) have been developed. These researches have a great help to forecast the outbreak of red rot disease.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous infection by red rot and chytrid diseases in Porphyra yezoensisUeda

Ding

2005

J Appl Phycol

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This paper presents the results of a study on the diseases of Porphyra yezoensis Ueda along the north coast of China, where red rot (Pythium porphyrae) and the chytrid Olpidiopsis sp. diseases were both found to be present. Infection by the mycelia of Pythium porphyrae and the thallus of Olpidiopsis sp. was studied in detail. At the early stage of infecton the mycelia of Pythium porphyrae and the fungus of chytrid can be found in host cells at the same time. In the middle and late stages of the complication, it mainly appears as red rot disease, toward the end appearing almost completely as red rot disease. The complication even can be found on the cells of fronds from the freeze-storage nori nets. However, the freeze-storage nets can help prevent spread of the infection and improve nori quality.

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Immunological detection of the fungal parasite, Pythium sp.; the causative organism of red rot disease in Porphyra yezoensis

Cited by 20 publications

References 10 publications

Effect of pH and salinity on the removal of phytal animals during summer cultivation of Sargassum fusiforme and Sargassum fulvellum in Korea

Effect of pH and salinity on the removal of phytal animals during summer cultivation of Sargassum fusiforme and Sargassum fulvellum in Korea

Forecasting infections of the red rot disease on Porphyra yezoensis Ueda (Rhodophyta) cultivation farms

Simultaneous infection by red rot and chytrid diseases in Porphyra yezoensisUeda

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