ArticleRice (New York, N.Y.)2025
Rice OsFKF1 Promotes Degradation of OsPRR37 for Short-Day Early Flowering.
Article in Rice (New York, N.Y.), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
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.
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