Article
Ecology
Youhei Fukui, Mahiko Abe, Masahiro Kobayashi
Summary: Bacteria, specifically Hyphomonas strains, were found to have significant effects on the growth and morphology of Pyropia yezoensis and Pyropia tenera. The influence of the bacteria varied under different culture conditions, with differences observed in length, length-to-width ratio, and normal morphology of the Pyropia thalli. Additionally, the bacteria showed a preference for attaching to the rhizoid surfaces of both Pyropia species.
Article
Biotechnology & Applied Microbiology
Megumu Takahashi, Koji Mikami
Summary: Phycobilisomes in cyanobacteria, red algae and glaucophyte algae can absorb various light wavelengths to optimize photosynthesis. Research on the red alga Pyropia yezoensis showed that changes in light wavelength, specifically blue and red light, can modify the composition of phycobilisomes, resulting in reversible color changes in the algae. This blue-red chromatic acclimation in Pyropia yezoensis provides new insights into regulatory mechanisms for adjusting photosynthetic pigment contents in phycobilisomes of photosynthetic organisms.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2021)
Article
Biotechnology & Applied Microbiology
Harune Endo, Hiroyuki Mizuta, Toshiki Uji
Summary: This study investigated the effects of ethylene biosynthesis inhibitors on sexual reproduction in the red alga Pyropia yezoensis. Results showed that AIB, a structural analog of ACC, induced sexual reproduction in a manner similar to ACC, indicating a role for ACC independent from ethylene in the regulation of sexual reproduction in plants.
JOURNAL OF APPLIED PHYCOLOGY
(2021)
Article
Biotechnology & Applied Microbiology
Sayaka Kominami, Hiroyuki Mizuta, Toshiki Uji
Summary: This study investigated the daily changes in gene expression of Neopyropia yezoensis, a major cultivated seaweed, during light/dark treatments. The results showed that genes associated with carbon-nitrogen assimilations, fatty acid synthesis, and starch synthesis were highly expressed in the morning, while a subset of genes related to the pentose phosphate pathway, cell cycle, and DNA replication were upregulated in the evening. Additionally, genes involved in asparagine catabolism and tricarboxylic acid cycle were highly expressed at dusk, suggesting their role in nitrogen and carbon supply during the dark. Furthermore, genes encoding cryptochrome/photolyase family and histone modification proteins were identified as potential regulators of diurnal rhythmic genes.
MARINE BIOTECHNOLOGY
(2022)
Article
Plant Sciences
Ji-Hyeok Lee, Ginne Ahn, Ju-Young Ko, Nalae Kang, Kyungsook Jung, Eui-Jeong Han, Gwang-Hoon Kim, Hee Jeong Kim, Cheol Soo Choi, You-Jin Jeon
Summary: The hepatoprotective effect of PYLP against alcohol-induced liver injury was demonstrated in mice, showing significant reduction in liver damage, increased antioxidant enzyme activity, and modulation of anti-apoptotic signaling pathway to minimize alcohol-induced tissue damage. The results suggest that PYLP, rich in polyunsaturated fatty acids, extracted from the red alga P. yezoensis, may be a potential liver protectant in the hangover industry.
Article
Biotechnology & Applied Microbiology
Xinshu Li, Xin Sun, Lin Gao, Juntian Xu, Guang Gao
Summary: The study revealed the interactive effects of periodical dehydration and salinity on biomass yield and biochemical composition in Pyropia yezoensis. Salinity of 25 psu was optimal, with dehydration altering the optimal conditions for cultivation.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2021)
Article
Biotechnology & Applied Microbiology
Ryuta Terada, Gregory N. Nishihara, Kaname Arimura, Yuki Watanabe, Takayuki Mine, Tarou Morikawa
Summary: The response to dehydration and recovery ability differ between different life-history stages of the red alga, with the microscopic sporophyte showing greater sensitivity to dehydration stress than the macroscopic gametophyte.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2021)
Article
Cell Biology
Kensuke Taya, Shunzei Takeuchi, Megumu Takahashi, Ken-ichiro Hayashi, Koji Mikami
Summary: Auxin plays a crucial role in the polarized tip cell growth and division of the red alga Neopyropia yezoensis. The auxin receptor-like protein in N. yezoensis differs from the auxin receptor of terrestrial plants, Arabidopsis thaliana. These findings shed light on the mechanisms of auxin-induced tip growth in plants.
Article
Biochemistry & Molecular Biology
Selvakumari Ulagesan, Taek-Jeong Nam, Youn-Hee Choi
Summary: In this study, phycoerythrin was extracted and purified from Pyropia yezoensis, showing significant antioxidant activity and cytotoxicity against HepG2 cells. The pigment had a typical spectrum of R-phycoerythrin and a molecular mass of 17.97 kDa, with a 100% sequence similarity with the R-phycoerythrin alpha subunit of Pyropia yezoensis.
Article
Biotechnology & Applied Microbiology
Jihae Park, Hojun Lee, Soyeon Choi, Lalit K. Pandey, Stephen Depuydt, Jonas De Saeger, Joon-Tae Park, Taejun Han
Summary: This study investigated the depigmentation and anti-ageing properties of red seaweed extracts for skin care. The results showed that the extracts did not have cytotoxic effects and had inhibitory effects on melanogenesis and tyrosinase activity, as well as promoting collagen production.
JOURNAL OF APPLIED PHYCOLOGY
(2021)
Article
Marine & Freshwater Biology
Guoying Du, Xiaojiao Li, Junhao Wang, Shuai Che, Xuefeng Zhong, Yunxiang Mao
Summary: Natural dehydration from exposure to air has stronger and more heterogeneous effects on photosynthetic activities in macroalgae compared to high salinity or high mannitol concentration.
MARINE LIFE SCIENCE & TECHNOLOGY
(2022)
Article
Biotechnology & Applied Microbiology
Toshiki Uji, Hiroyuki Mizuta
Summary: Heat stress negatively affects algal growth and physiological processes, but 1-aminocyclopropane-1-carboxylic acid (ACC) enhances tolerance to heat stress in the marine red alga Neopyropia yezoensis by increasing the expression of genes involved in antioxidant defense systems to protect photosynthesis and respiration.
JOURNAL OF APPLIED PHYCOLOGY
(2022)
Article
Plant Sciences
Soon Jeong Lee, Sang-Rae Lee
Summary: This study developed a species-specific molecular marker for distinguishing between two red rot disease pathogens. Without sequencing, the polymerase chain reaction restriction fragment length polymorphism method was used to classify Pythium species at the species level. The developed molecular markers are effective for long-term monitoring of infection and distribution patterns in Pyropia aquaculture farms.
Article
Plant Sciences
Narae Han, Jiwoong Wi, Sungoh Im, Ka-Min Lim, Hun-Dong Lee, Won-Joong Jeong, Geun-Joong Kim, Chan Song Kim, Eun-Jeong Park, Mi Sook Hwang, Dong-Woog Choi
Summary: An increase in seawater temperature due to global warming is expected to limit the growth of marine algae, including the commercially valuable red alga Pyropia yezoensis. Through transcriptome sequencing, a novel heat-tolerant gene PyHRG1 was identified in Pyropia yezoensis, which encodes a red algae-specific protein and plays a role in heat tolerance.
Article
Plant Sciences
Yuji Hiwatashi, Mizuho Shimada, Koji Mikami, Nagisa Takada
Summary: This study used high-resolution microscopy and live imaging techniques to analyze the tip growth and cell division in the macro red alga Neopyropia yezoensis. The results showed that microtubules and actin filaments are involved in the directionality and expansion of tip growth, and chloroplast movement may be dependent on the cytoskeleton. The findings provide insights into the regulatory mechanisms underlying cellular growth in multicellular red algae.
FRONTIERS IN PLANT SCIENCE
(2022)