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<p><i>Pyropia haitanensis</i> is one of the important economic seaweeds and is widely cultured throughout China. During cultivation, <i>P. haitanensis</i> is susceptible to green spot disease (GSD) and other diseases, all of which lead to serious economic losses. In this study, we investigated the effects of an elevated CO<sub>2</sub> concentration (1000 μL&#xa0;L<sup>−1</sup>) on the photosynthesis and growth of GSD-like disease-inflicted <i>P. haitanensis</i> during prolonged (18&#xa0;days) cultivation. Compared with cultivation under ambient CO<sub>2</sub>, cultivation under conditions of high CO<sub>2</sub> resulted in an increase in maximum net photosynthetic rate (NPRm) and maximum relative electron transport rate through Photosystem II (rETRm) of <i>P. haitanensis</i> infected with GSD-like disease, despite a decrease in NPRm during the first 6&#xa0;days of cultivation. Cultivation under elevated CO<sub>2</sub> levels also led to higher levels of photosynthetic pigments in the seaweed. Taken together, these results suggest that culture at high CO<sub>2</sub> concentrations may raise the GSD-like bacterial infection status of <i>P. haitanensis</i> by enhancing its photosynthetic capacity, a response which could be considered an early adaptation to CO<sub>2</sub>-induced GSD-like disease resistance. Our results indicate that high CO<sub>2</sub> levels can be used as a treatment for GSD-like disease in cultivated <i>P. haitanensis</i>.</p>

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Utilization of high CO2 level as a treatment for green spot disease-like disease in the cultivated seaweed Pyropia haitanensis

  • 期刊论文

  • 发表日期：

    2025年2月9日

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  • Dongya Bao,
  • Huawei Zhang,
  • Mingjiang Wu,
  • Zengling Ma,
  • Binbin Chen

摘要

Pyropia haitanensis is one of the important economic seaweeds and is widely cultured throughout China. During cultivation, P. haitanensis is susceptible to green spot disease (GSD) and other diseases, all of which lead to serious economic losses. In this study, we investigated the effects of an elevated CO2 concentration (1000 μL L−1) on the photosynthesis and growth of GSD-like disease-inflicted P. haitanensis during prolonged (18 days) cultivation. Compared with cultivation under ambient CO2, cultivation under conditions of high CO2 resulted in an increase in maximum net photosynthetic rate (NPRm) and maximum relative electron transport rate through Photosystem II (rETRm) of P. haitanensis infected with GSD-like disease, despite a decrease in NPRm during the first 6 days of cultivation. Cultivation under elevated CO2 levels also led to higher levels of photosynthetic pigments in the seaweed. Taken together, these results suggest that culture at high CO2 concentrations may raise the GSD-like bacterial infection status of P. haitanensis by enhancing its photosynthetic capacity, a response which could be considered an early adaptation to CO2-induced GSD-like disease resistance. Our results indicate that high CO2 levels can be used as a treatment for GSD-like disease in cultivated P. haitanensis.