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<p>Many plant species use changes in day length to fine-tune flowering time and achieve successful reproduction under optimal conditions. Extensive molecular genetic studies have identified key regulatory genes that repress flowering under non-inductive long-day (LD) conditions in rice (<i>Oryza sativa</i>), a facultative short-day (SD) plant. However, understanding how these regulators are modulated at the post-translational level in response to photoperiodic conditions remained elusive. In this study, we showed that the rice F-box protein FLAVIN-BINDING, KELCH REPEAT, F-BOX 1 (OsFKF1) interacts with and promotes the degradation of the LD-dependent flowering repressor PSEUDO-RESPONSE REGULATOR 37 (OsPRR37)/Heading date 2 (Hd2). Genetic analysis using <i>osfkf1 osprr37</i> double mutants suggested that OsFKF1 destabilizes OsPRR37 to upregulate <i>Early heading date 1</i> expression for early flowering under SD. In addition, we found that Hd1, which is a flowering inducer in SD but acts as a flowering repressor in LD, interacts with OsPRR37, suggesting that the Hd1-OsPRR37 complex inhibits flowering under LD. Our results provide new insights into the post-translational regulation of OsFKF1-OsPRR37-Hd1 in photoperiodic flowering in rice.</p>

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Rice OsFKF1 Promotes Degradation of OsPRR37 for Short-Day Early Flowering

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月26日

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  • Hyeryung Yoon,
  • Sang-Ji Lee,
  • Jinku Kang,
  • Sung-Hwan Cho,
  • Nam-Chon Paek

摘要

Many plant species use changes in day length to fine-tune flowering time and achieve successful reproduction under optimal conditions. Extensive molecular genetic studies have identified key regulatory genes that repress flowering under non-inductive long-day (LD) conditions in rice (Oryza sativa), a facultative short-day (SD) plant. However, understanding how these regulators are modulated at the post-translational level in response to photoperiodic conditions remained elusive. In this study, we showed that the rice F-box protein FLAVIN-BINDING, KELCH REPEAT, F-BOX 1 (OsFKF1) interacts with and promotes the degradation of the LD-dependent flowering repressor PSEUDO-RESPONSE REGULATOR 37 (OsPRR37)/Heading date 2 (Hd2). Genetic analysis using osfkf1 osprr37 double mutants suggested that OsFKF1 destabilizes OsPRR37 to upregulate Early heading date 1 expression for early flowering under SD. In addition, we found that Hd1, which is a flowering inducer in SD but acts as a flowering repressor in LD, interacts with OsPRR37, suggesting that the Hd1-OsPRR37 complex inhibits flowering under LD. Our results provide new insights into the post-translational regulation of OsFKF1-OsPRR37-Hd1 in photoperiodic flowering in rice.