Regulatory role of external calcium on Pythium porphyrae (Oomycota) zoospore release, development and infection in causing red rot disease of Porphyra yezoensis (Rhodophyta)

Formation of zoosporangia and cleavage of zoosporangial cytoplasm to zoospores in Pythium porphyrae is absolutely dependent on extracellular calcium. Calcium ion could be substituted neither by monovalent nor divalent cations tested. Increased concentrations of extracellular calcium did not affect t...

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Published inFEMS microbiology letters Vol. 211; no. 2; pp. 253 - 257
Main Authors Addepalli, M.K, Fujita, Yuji
Format Journal Article
LanguageEnglish
Published Elsevier B.V 04.06.2002
Subjects
Calcium ion
Marine Pythium
Motility
Porphyra yezoensis
Zoospore
Calcium ion
Motility
Zoospore
Marine Pythium
Porphyra yezoensis
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Summary:Formation of zoosporangia and cleavage of zoosporangial cytoplasm to zoospores in Pythium porphyrae is absolutely dependent on extracellular calcium. Calcium ion could be substituted neither by monovalent nor divalent cations tested. Increased concentrations of extracellular calcium did not affect the release of zoospores from zoosporangia but inhibited the zoospore motility. Chelating calcium ion by EGTA has decreased the ability of encysted zoospores to germinate and form appressoria. The increased external calcium-ion concentration has decreased the infectivity of Porphyra yezoensis thalli in a linear fashion apparently indicating a role of calcium in the signaling mechanism.
ISSN:0378-1097
1574-6968
DOI:10.1016/S0378-1097(02)00700-0