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
Biotechnology & Applied Microbiology
Schery Umanzor, Sol Han, Hye-In Song, Ji-Sook Park, Alan T. Critchley, Charles Yarish, Jang K. Kim
Summary: Seaweed-derived extracts, such as AMPEP and Kelpak (R), were examined for their effects on the life history of Neopyropia yezoensis. Temperature was found to be the main driver of developmental stages, although there were some interactive effects with the extracts. The results suggest that the application of AMPEP and Kelpak (R) may have some influence on the growth and development of N. yezoensis, but further research is needed to determine their impact on thermal tolerance.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2022)
Article
Environmental Sciences
Hui Xu, Rujie Jia, Zhourui Liang, Xiaoping Lu, Wenjun Wang
Summary: In this study, molecular markers and 18S rDNA were used to analyze the diversity and genetic structure of 22 Neopyropia yezoensis populations in North China. The results showed significant genetic differences between cultivated and wild populations, but cultivated individuals were found to be mixed with wild ones at the individual level. Additionally, wild populations were grouped into two distinct clades, with a specific 18S rDNA haplotype found at the intersection between the Yellow Sea and the Bohai Sea. These findings provide valuable insights into germplasm conservation, genetic breeding, and improvement of N. yezoensis farming practices.
FRONTIERS IN MARINE SCIENCE
(2023)
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
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)
Article
Environmental Sciences
Meilin Fu, Shichao Cao, Jingshi Li, Shuang Zhao, Jinlin Liu, Minmin Zhuang, Yutao Qin, Song Gao, Yuqing Sun, Jang Kyun Kim, Jianheng Zhang, Peimin He
Summary: Macroalgal blooms pose a serious threat to public health, fisheries, ecosystems, and global economies. The elimination of Ulva attached to aquaculture rafts can effectively prevent and control blooms. This study found that dried Neopyropia yezoensis and its culture filtrates and thalli have strong inhibitory effects on Ulva prolifera germination and attachment, suggesting their potential use to control green tides at the source.
MARINE POLLUTION BULLETIN
(2022)
Article
Cell Biology
Ho Viet Khoa, Koji Mikami
Summary: Heat stress responses in seaweeds involve both membrane-fluidization-dependent and -independent pathways. Heat stress induces the expression of specific genes in the red alga Neopyropia yezoensis, while the membrane fluidizer benzyl alcohol does not. In addition, dark treatment under heat stress promotes the expression of certain genes, while others remain unaffected.
Article
Biochemistry & Molecular Biology
Shinnosuke Ueda, Hiroyuki Mizuta, Toshiki Uji
Summary: A ChIP method with modifications has been developed in the red macroalga Neopyropia yezoensis, enabling the identification of histone marks in generation-specific genes. The results show that the acetylation of histone H3 remains relatively high even in generation-repressed gene expression.
MOLECULAR BIOTECHNOLOGY
(2023)
Review
Environmental Sciences
Yuqing Sun, Lulu Yao, Jinlin Liu, Yichao Tong, Jing Xia, Xiaohui Zhao, Shuang Zhao, Meilin Fu, Minmin Zhuang, Peimin He, Jianheng Zhang
Summary: Green tide outbreaks in the Southern Yellow Sea of China since 2007 have caused significant economic losses and environmental damage. A relatively small scale of green tide outbreaks in 2018 and 2020 were observed due to the killing of green macroalgae attached to cultivation ropes and early removal of aquaculture rafts. To address current challenges in green tide prevention, a comprehensive control method combining ecological farming, early prevention, and resource utilization is proposed.
MARINE POLLUTION BULLETIN
(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
Koji Mikami, Ho Viet Khoa
Summary: Heat shock protein 70 (HSP70) is a conserved protein involved in maintaining protein folding and refolding in both prokaryotic and eukaryotic organisms. In the red alga Neopyropia yezoensis, we identified genes encoding HSP70 proteins in different cellular compartments. We found that membrane fluidization plays a role in the heat-induced expression of HSP70 genes in this alga. Our results suggest a unique regulatory system for heat-induced expression of HSP70 genes in N. yezoensis.
Article
Plant Sciences
Toshiki Uji, Takuya Kandori, Shiho Konishi, Hiroyuki Mizuta
Summary: Exogenous ACC increases PLD activity and induces PLD transcript accumulation in red algae, leading to an increase in PA. PLD positively regulates sexual cell differentiation and negatively regulates growth.
Article
Biotechnology & Applied Microbiology
Menglin Guo, Zhizhuo Shao, Zhenbing Zheng, Guangce Wang
Summary: In this study, the relationship between Ferredoxin-NADP+ oxidoreductase (FNR) and the oxidized pentose phosphate pathway (OPPP) in Neopyropia yezoensis was investigated. Transgenic strains of N. yezoensis with overexpression and silence of FNR were obtained. The results showed that reduction of FNR content can enhance OPPP, which further promotes the cyclic electron transportation (CET) operation. This study demonstrates the close relationship between photosynthetic electron transportation and carbohydrate metabolism in a strong resurrection plant.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2023)
Article
Multidisciplinary Sciences
Sol Han, Ji-Sook Park, Schery Umanzor, Charles Yarish, Jang K. Kim
Summary: This study utilized various extraction methods to obtain metabolites from Sargassum horneri and applied them to Neopyropia yezoensis. The extracts derived through boiling, soaking, and autoclaving showed increased tolerance to high-temperature stress and improved growth compared to the control group.
SCIENTIFIC REPORTS
(2022)
Article
Plant Sciences
Schery Umanzor, Sol Han, Hye-In Song, Ji-Sook Park, Alan T. Critchley, Charles Yarish, Jang K. Kim
Summary: The use of seaweed extracts as biostimulants, specifically the Ascophyllum marine plant extract powder (AMPEP), has been found to enhance growth and thermal tolerance in Neopyropia yezoensis. The study also revealed that the growth enhancement can be transferred to new blades through archeospore germination, providing new evidence for the potential use of seaweed extracts in supporting the cultivation of economically important seaweed species.