Photoreceptor regulation of CONSTANS protein in photoperiodic flowering
Photoreceptor regulation of CONSTANS protein in photoperiodic flowering
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DOI：
10.1126/science.1091761
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发表时间：
2004-02-13
期刊：
影响因子：
56.9
通讯作者：
Coupland, G
中科院分区：
文献类型：
--
作者：
Valverde, F;Mouradov, A;Coupland, G
许多植物开花是对日照长度的季节性波动的反应。拟南芥的CONSTANS（CO）基因在长日照下促进开花。当CO信使RNA表达与植物暴露于光一致时，诱导开花。然而，这如何促进CO活性是未知的。我们表明，光稳定核CO蛋白在晚上，而在早晨或在黑暗中的蛋白质被降解的蛋白酶体。光感受器调节CO稳定性，并拮抗性地产生CO丰度的每日节律。这一层的调节完善了CO信使RNA的昼夜节律，是白天控制开花的机制的核心。
Many plants flower in response to seasonal fluctuations in day length. The CONSTANS (CO) gene of Arabidopsis promotes flowering in long days. Flowering is induced when CO messenger RNA expression coincides with the exposure of plants to light. However, how this promotes CO activity is unknown. We show that light stabilizes nuclear CO protein in the evening, whereas in the morning or in darkness the protein is degraded by the proteasome. Photoreceptors regulate CO stability and act antagonistically to generate daily rhythms in CO abundance. This layer of regulation refines the circadian rhythm in CO messenger RNA and is central to the mechanism by which day length controls flowering.