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ORIGINAL RESEARCH article

Front. Plant Sci.
Sec. Aquatic Photosynthetic Organisms
Volume 15 - 2024 | doi: 10.3389/fpls.2024.1500947
This article is part of the Research Topic Functional Response of Aquatic Plants to Environmental Stressors View all 11 articles

Night-break treatment with blue and green lights regulates erect thallus formation in the brown alga Petalonia fascia (KU-1293)

Provisionally accepted
Yuya Maegawa Yuya Maegawa 1Fumio Takahashi Fumio Takahashi 2Shinya Yoshikawa Shinya Yoshikawa 1*
  • 1 Faculty of Marine Science and Technology, Fukui Prefectural University, obama, Japan
  • 2 Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Japan

The final, formatted version of the article will be published soon.

    In this study, we investigated the photoperiodic responses regulating erect thallus formation in Petalonia fascia (KU-1293). We found that, through critical day length analysis and night break treatment culture experiments, P. fascia formed erect thalli under short-day conditions, indicating a genuine photoperiodic response. The critical day length for this morphological change was 10–11 h. Notably, night-break treatment with blue light (BL) and green light (GL) inhibited, whereas that with red light (RL) enhanced erect thallus formation. P. fascia was more sensitive to BL than to GL, requiring approximately 100-times less light to exhibit similar effects. Furthermore, promotion of erect thallus formation by RL was not negated by far-red light, suggesting the presence of a novel RL receptor distinct from the classical phytochrome system in terrestrial plants. These findings highlight the complexity of light wavelength interactions in regulating photoperiodic responses and suggest the presence of unique photoreceptors for day-length perception and erect thallus formation in P. fascia.

    Keywords: Photomorphogenesis, Blue light receptor, Green light receptor, Phaeophyceae, photoperiodism

    Received: 24 Sep 2024; Accepted: 17 Dec 2024.

    Copyright: © 2024 Maegawa, Takahashi and Yoshikawa. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Shinya Yoshikawa, Faculty of Marine Science and Technology, Fukui Prefectural University, obama, Japan

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