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Recently, the botanical journal Plant Physiology (TOP) published the latest research results
of the research team on the molecular mechanism of marine diatoms adapting to the fluctuating light environment of the key laboratory of experimental marine biology of the Chinese Academy of Sciences.
This is another important progress
made by the team in the field of diatom adaptation to fluctuating light environment after the publication of a research paper on the mechanism of marine diatom adaptation to dynamic environment in the Plant Journal (TOP).
As we all know, the cultivation of seaweed in the laboratory is mainly based on constant light conditions, but the light environment in the field environment is not constant but mainly wavering, which leads to the growth of indoor culture and field conditions is significantly different, and the molecular mechanism behind it is still poorly
understood.
Marine diatoms are extremely adaptable to the environment and can dominate in environments such as ocean upwelling and turbulence
.
These environments are unstable, where light intensity varies drastically, and diatoms need to respond quickly to changing light environments to maintain growth
.
The team is based on gene editing, multiomics, and13Metabolic flow analysis, which comprehensively uses bioinformatics, molecular biology, biochemistry and physiology, to reveal the molecular mechanism
of marine diatoms responding to fluctuating light from different levels.
The team found that marine diatoms can use dynamic light
stably and efficiently compared to dinoflagellates.
The proton gradient proteins (PGRL1 and PGR5) on the photosynthetic membrane of marine diatoms are extremely sensitive to the fluctuation amplitude of fluctuating light (this feature is significantly different from that of land plants and freshwater algae), and play an important regulatory role
in the adaptation of diatoms to the dynamic light environment.
Among them, excessive accumulation of PGRL1 inhibits the efficiency of photosystem II under dynamic light, which changes the understanding that PGRL1 only plays a high-light protection role around photosystem I
。 The study also found that marine diatoms have enhanced carbon fixation capacity and increased
lipid accumulation under high-intensity dynamic light.
The above results not only help us to fully understand the biological characteristics of marine diatoms, but also provide new ideas
for the high light efficiency breeding and oil yield improvement of economic seaweed.
Molecular mechanisms by which marine diatoms adapt to dynamic light environments
The first author of the paper is Dr.
Lu Zhou and Associate Researcher
Gao Shan.
This research was jointly funded by the National Key R&D Program, the Shandong Provincial Key R&D Program, the National Algae Industry Technology System, the Key Deployment Project of the University Science Center of the Chinese Academy of Sciences, and the Outstanding Youth Fund of the Key Laboratory of Experimental Marine Biology.
Related research results:
Zhou Lu#, Gao Shan#, Yang Wenting, Wu Songcui, Huan Li, Xie Xiujun, Wang Xulei, Lin Senjie*, Wang Guangce*.
Transcriptomic and metabolic signatures of diatom plasticity to light fluctuations.
Plant Physiology.
2022.
DOI:10.
1093/plphys/kiac455.
https://doi.
org/10.
1093/plphys/kiac455
Zhou Lu#, Gao Shan#, Wu Songcui, Han Danxiang, Wang Hui, Gu Wenhui, Hu Qiang, Wang Jing, Wang Guangce*.
PGRL1 overexpression in Phaeodactylum tricornutum inhibits growth and reduces apparent PSII activity.
The Plant Journal, 2020, 103, 1850–1857
https://doi.
org/10.
1111/tpj.
14872