Maegawa Yuya, Takahashi Fumio, Hiyama Tsunami, Yoshikawa Shinya
Faculty of Marine Science and Technology, Fukui Prefectural University, Obama, Fukui, Japan.
Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba, Japan.
Front Plant Sci. 2025 Jan 15;15:1500947. doi: 10.3389/fpls.2024.1500947. eCollection 2024.
In this study, we investigated the photoperiodic responses regulating erect thallus formation in (KU-1293). We found that, through critical day length analysis and night break treatment culture experiments, 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. 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 .
在本研究中，我们调查了调节（KU - 1293）直立叶状体形成的光周期反应。我们发现，通过临界日长分析和夜间中断处理培养实验，（KU - 1293）在短日条件下形成直立叶状体，表明存在真正的光周期反应。这种形态变化的临界日长为10 - 11小时。值得注意的是，蓝光（BL）和绿光（GL）的夜间中断处理抑制了直立叶状体的形成，而红光（RL）的夜间中断处理则增强了直立叶状体的形成。（KU - 1293）对蓝光的敏感性高于绿光，表现出类似效果所需的光量约少100倍。此外，远红光不会消除红光对直立叶状体形成的促进作用，这表明在（KU - 1293）中存在一种不同于陆生植物中经典光敏色素系统的新型红光受体。这些发现突出了光波长相互作用在调节光周期反应中的复杂性，并表明在（KU - 1293）中存在用于日长感知和直立叶状体形成的独特光感受器。
