Phylogenetic relationships and generic concepts in the red order Bangiales: challenges ahead

Nelson, Wendy A.; Farr, Tracy J.; Broom, J. E.

doi:10.2216/05-26.1

Cited by 50 publications

(58 citation statements)

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“…olivii described by Brodie et al (2007) was growing epiphytically on Gracilaria, and they also reported this species growing on other hosts, typically in the shallow subtidal zone. Although in New Zealand there are many undescribed species of Pyropia still to be formally described that have been distinguished on the basis of molecular sequence data (e.g., Nelson et al 2006, Sutherland et al 2011, the epiphytic habit and the distinctive colour distinguish this species from other Pyropia in New Zealand. There are some records of epiphytic Pyropia and Porphyra within the New Zealand region, but there are no published ac-…”

Section: Discussionmentioning

confidence: 99%

New distributional record for Pyropia koreana: confirmed to occur on the South Island, New Zealand

Nelson¹,

Sutherland²,

Hwang³

et al. 2014

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Section: Discussionmentioning

confidence: 99%

New distributional record for Pyropia koreana: confirmed to occur on the South Island, New Zealand

Nelson¹,

Sutherland²,

Hwang³

et al. 2014

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“…The use of the more conservative nrSSU locus has generally resulted in phylogenies with a well-supported ''backbone'' but little differentiation of closely related taxa. The protein-coding rbcL gene clearly distinguishes species, but support for ancient divergences is often less than the one obtained in analyses based on the nrSSU gene (Lindstrom & Fredericq 2003, Nelson et al 2006.…”

Section: Introductionmentioning

confidence: 88%

A new species of Pyropia (Rhodophyta, Bangiaceae), from the Pacific coast of Mexico, based on morphological and molecular evidence

et al. 2012

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Pyropia raulaguilarii sp. nov. is described from Michoacán, tropical Mexican Pacific, on basis of comparative morphology and nrSSU, rbcL sequence analysis. It is distinguished from other Pyropia species by the foliose and lanceolate gametophyte, a monoecious thallus and the zygotosporangia in packets of 2x2x4. The phylogenetic analysis showed that the two Pacific Mexican samples, from Caletilla and Carrizalillo (Michoacán), were almost identical and formed a distinctive and well supported clade segregated from other species of Pyropia from Brazil, USA and Mexico. The Mexican entity is morphologically and genetically distinct from other Pyropia species, suggesting that this species should be assigned to a new taxon.

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“…New Zealand offers diverse habitats for a range of Pyropia and other closely related Bangiales, with more than 30 species found there (Nelson et al 2006, Sutherland et al. 2011.…”

Section: Sampling and Isolationmentioning

confidence: 99%

“…New Zealand offers diverse habitats for a range of Pyropia and other closely related Bangiales, with more than 30 species found there (Nelson et al 2006, Sutherland et al 2011. Little is known about Pythium infection in Pyropia in natural habitats, even though the organism is http://e-algae.org al.…”

Section: Sampling and Isolationmentioning

confidence: 99%

“…The application of names is further complicated by culture collections and DNA databases containing misassigned sequences (Sandoval-Sierra et al 2014) Pythium was first recorded on Porphyra tenera (now Pyropia tenera) in Japan (Arasaki 1947), but it still took three decades to designate the infective agent as Pythium porphyrae (Takahashi et al 1977). Recent molecular studies, using mitochondria-encoded cytochrome oxidase subunit 1 (COI) and nuclear-encoded internal transcribed spacer of the rDNA cistron (ITS), have shown that Pythium consists of several well-supported clades with the marine species P. porphyrae and P. chondricola being closely related and in the same clade (clade A) De Cock 2004, Robideau et al 2011).New Zealand offers diverse habitats for a range of Pyropia and other closely related Bangiales, with more than 30 species found there (Nelson et al 2006, Sutherland et al. 2011.…”

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Infection and cox2 sequence of Pythium chondricola (Oomycetes) causing red rot disease in Pyropia yezoensis (Rhodophyta) in Korea

Lee

Jee

Son

et al. 2017

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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.Key Words: Bangia; Bangiales; DNA barcoding; host specificity; Porphyra; Pythium chondricola; Rhodophyta; species delimitation; synonymization; taxonomy INTRODUCTIONAquaculture of marine algae is an important industry, especially in Asia. The production of seaweeds more than doubled between 2000 and 2012 (Food and Agriculture Organization of the United Nations 2014). The red alga Pyropia is the most consumed alga in the world, both for food and in the biomedical industry (e.g., porphyran, pycobilliproteins) (Gachon et al. 2010). In 2013, Pyropia made up about 1.8 million tons which is about 8% of the total global seaweed production, with values of US $1.2 billion (FAO FishStat et al. 2016).Pyropia cultivation losses amount to over US $10 million annually from different diseases (Gachon et al. 2010, Blouin et al. 2011, Kim et al. 2014. Diseases like greenspot disease and Olpidiopsis blight as well as red-rot disease, result in a great decrease in productivity, yield and crop value (Kawamura et al. 2005, Klochkova et al. 2012, 2016b, Kim et al. 2014. With increasing farming intensity and increasing temperatures, caused by global warming, disease severity and occurrence is also expected to increase (Ding and Ma 2005, Gachon et al. 2010).Received January 17, 2017, Accepted February 25, 2017 *Corresponding Author E-mail: joe.zuccarello@vuw.ac.nz Tel: This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. 30 well investigated in aquacultural settings (e.g., Park ...

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Phylogenetic relationships and generic concepts in the red order Bangiales: challenges ahead

Cited by 50 publications

References 43 publications

New distributional record for Pyropia koreana: confirmed to occur on the South Island, New Zealand

New distributional record for Pyropia koreana: confirmed to occur on the South Island, New Zealand

<p align="left"><strong>A new species of <em>Pyropia</em> (Rhodophyta, Bangiaceae), from the Pacific coast of Mexico, based on morphological and molecular evidence</strong></p>

Infection and cox2 sequence of Pythium chondricola (Oomycetes) causing red rot disease in Pyropia yezoensis (Rhodophyta) in Korea

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