

FOLLOWUS
1.Jiangsu Province Engineering Research Center for Marine Bio-resources Sustainable Utilization, College of Oceanography, Hohai University, Nanjing 210024, China
2.Laboratory of Environmental Protection in Water Transport Engineering, Tianjin Research Institute of Water Transport Engineering, Tianjin 300456, China
3.College of Food Science and Light Industry, Nanjing Tech University, Nanjing 210024, China
liyongfu@hhu.edu.cn
lizhendong0517@163.com
Received:25 February 2025,
Accepted:28 April 2025,
Online First:03 July 2025,
Published:01 March 2026
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CHE Xingkai,LI Yongfu,LI Zhendong,et al.High-light resistance of the diatom Phaeodactylum tricornutum is enhanced by the addition of alginate-derived oligosaccharides (ADOs)[J].Journal of Oceanology and Limnology,2026,44(02):756-767.
CHE Xingkai,LI Yongfu,LI Zhendong,et al.High-light resistance of the diatom Phaeodactylum tricornutum is enhanced by the addition of alginate-derived oligosaccharides (ADOs)[J].Journal of Oceanology and Limnology,2026,44(02):756-767. DOI: 10.1007/s00343-025-5025-0.
To minimize the high energy cost of biomass production in the large-scale production of
Phaeodactylum
tricornutum
the diatom was cultured outdoor under solar light. The damage caused by outdoor high-light stress to the photosynthetic apparatus is a major threat to the productivity of
P
.
tricornutum
. We demonstrated that the addition of alginate-derived oligosaccharides (ADOs) could significantly enhance the high-light resistance of photosystem II (PSII) in
P
.
tricornutum
. The ADOs decreased PSII photoinhibition and increased the electron transport rate under high light. The beneficial impact of the ADOs in reducing light inhibition was more noticeable under increased light intensities. This positive effect was attributed to two factors. The first: the ADOs lowered the capability for absorbing light energy in the PSII reaction centers
protecting PSII from excess light energy under high light. The second: the ADOs enhanced the activity of antioxidant enzymes (APX and SOD)
reducing the over-accumulation of reactive oxygen species (ROS
i.e.
H
2
O
2
)
which further decreased the ROS-induced net degradation of D1 protein
ensuring the smooth photosynthetic electron transport of PSII under high light. Given the enhancement of high-light
resistance in
P
.
tricornutum
ADOs could serve as a protectant
which can be applied for large-scale production of
P
.
tricornutum
under outdoor culture conditions.
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