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Physicochemical responses of Pythium porphyrae (Oomycota), the causative organism of red rot disease in Porphyra to acidification
Author(s) -
Hwang Eun Kyoung,
Park Chan Sun,
Kakinuma Makoto
Publication year - 2009
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.2009.02284.x
Subject(s) - porphyra , biology , mycelium , pythium , biochemistry , incubation , amino acid , microbiology and biotechnology , methionine , food science , botany , algae
Physicochemical responses to acidification in Pythium porphyrae , the causative organism of red rot disease in Porphyra , were investigated. The acid tolerance of P. porphyrae mycelia under pH 4 (acidic condition) condition increased significantly compared with that of the mycelia under pH 8 (condition equivalent to seawater) condition. Free amino acid levels in the mycelia decreased 1.3–8.8‐fold under pH 4 condition. However, some free amino acids such as the d ‐cysteinolic acid‐like component, phosphoethanolamine, glutamic acid, aminoadipic acid and methionine increased 2.6–21.7‐fold under the same condition. Proton flux on the mycelia exposed to pH 8 increased significantly compared with the mycelia exposed to pH 4. The patterns of proteins present (examined by two‐dimensional polyacrylamide gel electrophoresis) differed among the pH conditions. These results suggest that P. porphyrae acquires acid tolerance and is able to adapt to the changing pH conditions. This has significant implications for the use of acidic fungicide treatment for prevention of red rot disease on Porphyra farms.