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A pathogen of New Zealand Pyropia plicata (Bangiales, Rhodophyta), Pythium porphyrae (Oomycota)

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posted on 23.08.2020 by N Diehl, GH Kim, Giuseppe Zuccarello
© 2017 The Korean Society of Phycology. Geographic distributions of pathogens are affected by dynamic processes involving host susceptibility, availability and abundance. An oomycete, Pythium porphyrae, is the causative agent of red rot disease, which plagues Pyropia farms in Korea and Japan almost every year and causes serious economic damage. We isolated an oomycete pathogen infecting Pyropia plicata from a natural population in Wellington, New Zealand. The pathogen was identified as Pythium porphyrae using cytochrome oxidase subunit 1 and internal transcribed spacer of the rDNA cistron molecular markers. Susceptibility test showed that this Pythium from New Zealand was able to infect several different species and genera of Bangiales including Pyropia but is not able to infect their sporophytic (conchocelis) phases. The sequences of the isolated New Zealand strain were also identical to Pythium chondricola from Korea and the type strain from the Netherlands. Genetic species delimitation analyses found no support for separating P. porphyrae from P. chondricola, nor do we find morphological characters to distinguish them. We propose that Pythium chondricola be placed in synonymy with P. porphyrae. It appears that the pathogen of Pyropia, both in aquaculture in the northern hemisphere and in natural populations in the southern hemisphere is one species.

History

Preferred citation

Diehl, N., Kim, G. H. & Zuccarello, G. C. (2017). A pathogen of New Zealand Pyropia plicata (Bangiales, Rhodophyta), Pythium porphyrae (Oomycota). Algae, 32(1), 29-39. https://doi.org/10.4490/algae.2017.32.2.25

Journal title

Algae

Volume

32

Issue

1

Publication date

01/01/2017

Pagination

29-39

Publisher

The Korean Society of Phycology

Publication status

Published

ISSN

1226-2617

eISSN

2093-0860

Language

en

Exports