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The Korean Society of Phycology (한국조류학회(藻類))
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Physiological and transcriptome analysis of acclimatory response to cold stress in marine red alga Pyropia yezoensis

  • Li-Hong Ma (College of Marine Life Sciences, Ocean University of China) ;
  • Lin Tian (College of Marine Life Sciences, Ocean University of China) ;
  • Yu-Qing Wang (Trier College of Sustainable Technology, Yantai University) ;
  • Cong-Ying Xie (College of Marine Life Sciences, Ocean University of China) ;
  • Guo-Ying Du (College of Marine Life Sciences, Ocean University of China)
  • Received : 2024.02.07
  • Accepted : 2024.03.07
  • Published : 2024.03.21
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Abstract

Red macroalga Pyropia yezoensis is a high valuable cultivated marine crop. Its acclimation to cold stress is especially important for long cultivation period across winter in coasts of warm temperate zone in East Asia. In this study, the response of P. yezoensis thalli to low temperature was analyzed on physiology and transcriptome level, to explore its acclimation mechanism to cold stress. The results showed that the practical photosynthesis activity (indicated by ΦPSII and qP) was depressed and pigment allophycocyanin content was decreased during the cold stress of 48 h. However, the Fv/Fm and non-photochemical quenching increased significantly after 24 h, and the average growth rate of thalli also rebounded from 24 to 48 h, indicating a certain extent of acclimation to cold stress. On transcriptionally, the low temperature promoted the expression of differentially expressed genes (DEGs) related to carbohydrate metabolism and energy metabolism, while genes related to photosynthetic system were depressed. The increased expression of DEGs involved in ribosomal biogenesis and lipid metabolism which could accelerate protein synthesis and enhance the degree of fatty acid unsaturation, might help P. yezoensis thallus cells to cope with cold stress. Further co-expression network analysis revealed differential expression trends along with stress time, and corresponding hub genes play important roles in the systemic acquired acclimation to cold stress. This study provides basic mechanisms of P. yezoensis acclimation to cold temperature and may aid in exploration of functional genes for genetic breeding of economic macroalgae.

Keywords

Acknowledgement

This study was financially supported by National Key Research and Development Program of China (2023YFD2400101, 2022YFD2400105).

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