Abstract
Diatoms are important contributors to global net primary productivity, and play a crucial role in the biogeochemical cycles of carbon, phosphorus, nitrogen, iron, and silicon. Currently in some regions in the ocean, there’s a trend that carbon content is high while oxygen concentration is low, and the underlying mechanisms of diatoms’ response to low oxygen environments are worth investigating. Phaeodactylum tricornutum is a model diatom whose genome has been sequenced; it provides a universal molecular toolbox and a stable transgenic expression system. Therefore, the study of the responses of P. tricornutum to low oxygen has not only fundamental research significance but also important ecological significance. In this study, growth rates were determined and proteomic analysis and metabolomic analysis were performed to examine P. tricornutum responses under different oxygen concentrations (2% oxygen concentration for hypoxic condition and 21% oxygen concentration for the normal condition (sterilized air)). Results show that the hypoxic environment inhibited the growth of P. tricornutum. In the hypoxic conditions, P. tricornutum could reset its metabolism pathways, including enhancement in lipid utilization, replenishment of tricarboxylic acid (TCA) cycle through the glyoxylic acid cycle, and down-regulation of photorespiration to reduce energy waste. Additionally, the stress resistance mechanism was activated to facilitate the adaptation to low oxygen conditions. This study helps to reveal the different metabolic changes to hypoxia of diatom from that of higher plants, which might be ascribed to their different habitats and needs further exploration in the future.
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Data Availability Statement
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Supported by the National Natural Science Foundation of China (Nos. 41876158, 31770024), the Natural Science Foundation of Hainan Province (No. 420QN219), the Biology and Biochemistry ESI Cultivation Discipline Open Project of Qilu University of Technology (No. ESIBBC202004), the Innovation and Development Joint Fund of Natural Science Foundation from Shandong Province (No. ZR2021LSW022), the Young Taishan Scholarship to Xuekui XIA (No. tsqn202103100), and the Start-up Fund Project of Hainan University (No. KYQD(ZR)20060)
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Zhao, P., Wu, Q., Xia, X. et al. Metabolomic and proteomic responses of Phaeodactylum tricornutum to hypoxia. J. Ocean. Limnol. 40, 1963–1973 (2022). https://doi.org/10.1007/s00343-021-1232-5
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DOI: https://doi.org/10.1007/s00343-021-1232-5