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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Effects of reactive oxygen species on α-tocopherol production in mitochondria and chloroplasts of Euglena gracilis
Journal of Applied Phycology, Volume 21, No. 2, Year 2009
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Description
The effects of reactive oxygen species (ROS) on α-tocopherol production in mitochondria and chloroplasts of Euglena gracilis were investigated. Addition of an organic carbon source to the medium resulted in increased mitochondrial activity, intracellular O2- concentration and α-tocopherol productivity in E. gracilis W 14ZUL (a chloroplast deficient mutant). α-Tocopherol productivity of the wild-type strain (with both mitochondria and chloroplast) was higher than that of the W14ZUL strain. In the case of the wild strain, the O2- generated in chloroplasts was efficiently scavenged by the α-tocopherol synthesized inside the chloroplast. In photoheterotrophic culture (with an organic carbon source), there was a positive correlation between α-tocopherol production and O2- generation. Addition of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (an inhibitor of photosynthesis) resulted in increased O2- generation and α-tocopherol productivity. These results indicate that the ROS generated in mitochondria and chloroplasts play important roles in α-tocopherol production by E. gracilis. The presence of chloroplasts and generation of intracellular ROS are important for efficient production of α-tocopherol. © 2008 Springer Science+Business Media B.V.
Authors & Co-Authors
Fujita, Tomoya
Japan, Tsukuba
University of Tsukuba
Ogbonna, James Chukwuma
Nigeria, Naukka
University of Nigeria
Tanaka, Hideo
Japan, Matsudo
Seitoku University
Aoyagi, H.
Japan, Tsukuba
University of Tsukuba
Statistics
Citations: 14
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1007/s10811-008-9349-x
ISSN:
09218971
Research Areas
Environmental