Tank cultivation of the red alga Palmaria palmata: Year-round induction of tetrasporangia, tetraspore release in darkness and mass cultivation of vegetative thalli

Aquaculture ◽  
2006 ◽  
Vol 252 (1) ◽  
pp. 20-30 ◽  
Author(s):  
Shao Jun Pang ◽  
Klaus Lüning
Keyword(s):  
Red Alga ◽  
Palmaria Palmata ◽  
Tank Cultivation ◽  
Mass Cultivation

Ultrastructural characterization of a pigment mutant of the red alga Palmaria palmata

1984 ◽  
Vol 62 (6) ◽  
pp. 1101-1107 ◽  
Author(s):  
C. M. Pueschel ◽  
J. P. van der Meer
Keyword(s):  
Red Alga ◽  
Palmaria Palmata ◽  
Wild Type ◽  
Ultrastructural Examination ◽  
Dark Treatment ◽  
Prolamellar Bodies ◽  
Ultrastructural Characterization ◽  
Wild Type Control

Ultrastructural examination of a green-pigmented mutant of the red alga Palmaria palmata (L.) O. Kuntze revealed unusual features of the chloroplasts. Encircling peripheral thylakoids, characteristic of the wild-type plastids and florideophyte plastids generally, were lacking. Parallel evenly spaced thylakoids occurred in groups, leaving large volumes of thylakoid-free stroma. Irregularly shaped, electron-dense inclusions with an amorphous substructure and diameters up to 3 μm occurred in some plastids. Cells of the sporeling holdfasts contained structures resembling prolamellar bodies. Attempts to induce formation of prolamellar bodies in blades by dark treatment for 5 weeks were unsuccessful. However, some plastids did develop highly corrugated thylakoids with the crests of one thylakoid apposed to the troughs of the adjacent thylakoid. Thylakoid morphology of the wild-type control was not altered by the absence of light.

Petersenia palmariae n. sp. (Oomycetes): a pathogenic parasite of the red alga Palmaria mollis (Rhodophyceae)

1985 ◽  
Vol 63 (3) ◽  
pp. 404-408 ◽  
Author(s):  
John P. van der Meer ◽  
Curt M. Pueschel
Keyword(s):  
New Species ◽  
Marine Algae ◽  
Vancouver Island ◽  
Red Alga ◽  
Palmaria Palmata ◽  
Infection Cycle ◽  
Fungal Parasite ◽  
Pathogenic Parasite ◽  
A New Species

Specimens of Palmaria mollis (Setchell and Gardner) van der Meer and Bird collected from Vancouver Island, Canada, were found to harbour a pathogenic fungal parasite. When infected fronds were put into culture, the algal thallus became completely covered with small white lesions. These were most concentrated in young tissue and soon killed the apices of the fronds. The parasite completed approximately one infection cycle per week at 10 °C. It died at temperatures near 15 °C, even though the host remained healthy at 20 °C. The parasite was identified as a species of Petersenia (Oomycetes). It most resembled P. lobata (H. E. Petersen) Sparrow but differed sufficiently in detail to consider it a new species, Petersenia palmariae. The new species does not infect Ceramium rubrum (Hudson) C. Agardh which serves as host for both P. lobata and P. pollagaster, the only other members of the genus known to parasitize marine algae. Nor does it infect Palmaria palmata (L.) O. Kuntze, a species related to the host on which it was discovered, which suggests Petersenia palmariae may be host specific.

scholarly journals Efficient Extraction and Antioxidant Capacity of Mycosporine-Like Amino Acids from Red Alga Dulse Palmaria palmata in Japan

Marine Drugs ◽  
2020 ◽  
Vol 18 (10) ◽  
pp. 502
Author(s):  
Yuki Nishida ◽  
Yuya Kumagai ◽  
Shunta Michiba ◽  
Hajime Yasui ◽  
Hideki Kishimura
Keyword(s):  
Amino Acids ◽  
Antioxidant Capacity ◽  
Extraction Method ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Red Alga ◽  
Alkaline Condition ◽  
Palmaria Palmata ◽  
Successive Extraction ◽  
Efficient Extraction

Mycosporine-like amino acids (MAAs) are the ultraviolet (UV)-absorbable compounds, which are naturally produced by cyanobacteria and algae. Not only these algae but also marine organisms utilize MAAs to protect their DNA from UV-induced damage. On the other hand, the content of MAAs in algae was changed by the environmental condition and season. In addition to the UV-protected function, the antioxidant capacity of MAAs can apply to the cosmetic sunscreen materials and anti-cancer for human health. In this study, we developed the efficient extraction method of MAAs from red alga dulse in Usujiri (Hokkaido, Japan) and investigated the monthly variation. We also evaluated the antioxidant capacity. We employed the successive extraction method of water and then methanol extraction. Spectrophotometric and HPLC analyses revealed that the yield of MAAs by 6 h water extraction was the highest among the tested conditions, and the content of MAAs in the sample of February was the most (6.930 µmol g−1 dry weight) among the sample from January to May in 2019. Antioxidant capacity of MAAs such as crude MAAs, the purified palythine and porphyra-334 were determined by 2,2’-azinobis(3-ethylbenzothiazoline 6-sulfonic acid) (ABTS) radical scavenging and ferrous reducing power assays in various pH conditions, showing that the highest scavenging activity and reducing power were found at alkaline condition (pH 8.0).

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