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Physiological and biochemical responses to light and temperature stress in free-living conchocelis of Neopyropia katadae (Bangiales, Rhodophyta)

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Abstract

Neopyropia katadae is one of the important economic seaweeds in China. A mass of free-living conchocelis is needed in the commercial cultivation of N. katadae. This study aimed to clarify the optimum growth conditions of the free-living conchocelis of N. katadae and its photosynthetic and biochemical response to different temperatures and irradiances, so as to provide the theoretical basis for the formulation of cultivation strategy of free-living conchocelis. The free-living conchocelis exhibited higher growth rate (RGR), net photosynthetic rates (PN), maximum relative electron transport rates (rETRmax), and maximal photochemical efficiency of PS II (Fv/Fm) at 16–20 °C and 60–80 μmol photons m−2 s−1. Light saturation point of the free-living conchocelis is 60.3–85.2 μmol photons m−2 s−1, and low light compensation point is 6.1–13.7 μmol photons m−2 s−1 in the range of 16–25 °C. The greatly reduced values of RGR, PN, Fv/Fm, rETRmax, Y(II), and Ek (minimum saturating irradiance) indicated that damage to the photosynthetic apparatus and photoinhibition occurred in the free-living conchocelis of N. katadae under high temperature of 23–25 °C and high light intensity (100–200 μmol photons m−2 s−1). High values of Fv/Fm and α (initial slope of the RLC) were both observed at low light intensities (10–80 μmol photons m−2 s−1), suggesting that this conchocelis is low light adapted. The content of glutathione, proline, peroxidase, ascorbate peroxidase (APX), and abscisic acid (ABA) all presented at high levels at 10 μmol photons m−2 s−1, indicating that these compounds probably play an important role under low light stress in the free-living conchocelis. High temperature (24 °C) and high light intensities (100–150 μmol photons m−2 s−1) both led to reactive oxygen species accumulation. Compared to the control, the activities of antioxidant enzymes (superoxide dismutase, catalase, and glutathione reductase) were substantially enhanced at 24 °C and 100 μmol photons m−2 s−1, and ascorbic acid content in 24 °C group was relatively higher, suggesting that these compounds probably play a crucial role in defensive reactions against high-temperature-induced or high light-induced oxidative stress in the conchocelis. Based on these results, it was proposed that the optimal cultivation conditions for free-living conchocelis of N. katadae were at 16–20 °C and 60–80 μmol photons m−2 s−1.

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Data availability

The datasets generated in the present study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors would like to thank Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences for equipment support.

Funding

This study was financially supported by National Key R&D Program of China (2018YFD0901505; 2018YFD0900305), China Agriculture Research System of MOF and MARA.

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Authors and Affiliations

  1. Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, China

    Zhourui Liang, Fuli Liu, Wenjun Wang, Pengyan Zhang, Yanmin Yuan, Yi Liu, Haiqin Yao, Rujie Jia, Xiutao Sun & Feijiu Wang

  2. Laboratory for Marine Fisheries Science and Food Production Processes, National Laboratory for Marine Science and Technology, Qingdao, China

    Zhourui Liang, Fuli Liu, Wenjun Wang, Pengyan Zhang & Xiutao Sun

  3. College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, China

    Yi Liu & Rujie Jia

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  1. Zhourui Liang
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Contributions

ZRL designed and performed the experiments, analyzed the data, and drafted the manuscript. FLL and WJW performed sample collection, helped design experiments, analyzed the data, and drafted the manuscript. PYZ, YMY and HQY helped in culturing thallus and conchocelis of N. katadae. YL and RJJ helped in performing the experiments and analyzed the data. XTS and FJW performed sample collection and analyzed part of the data. All authors read and approved the final manuscript.

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Correspondence to Fuli Liu.

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Liang, Z., Liu, F., Wang, W. et al. Physiological and biochemical responses to light and temperature stress in free-living conchocelis of Neopyropia katadae (Bangiales, Rhodophyta). J Appl Phycol 34, 1059–1072 (2022). https://doi.org/10.1007/s10811-022-02691-5

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