2020年3月6日，来自意大利罗马萨皮恩扎大学的Maura Cardarelli 研究组，在Plant Journal 发表了题为Light controls stamen elongation via cryptochromes, phytochromes and COP1 through HY5 and HYH 的研究论文。

雄蕊伸长可以保证雄性的可育性。在拟南芥中，雄蕊伸长是由生长素响应因子ARF8控制，而ARF8可以调节生长素抑制因子IAA19的表达。

本研究揭示了光在控制雄蕊伸长中的作用。通过广泛的遗传和分子分析，我们发现光信号阻遏因子COP1通过其靶标HY5和HYH控制雄蕊伸长。并且，与ARF8相反，HY5直接抑制雄蕊中IAA19的表达。此外，我们还发现，在闭合花芽中，当花萼和花瓣遮挡光线时，蓝光受体CRY1/CRY2抑制雄蕊伸长。在花期和随后的阶段，雄蕊的伸长受到红光和远红光受体PHYA/PHYB的抑制。

总而言之，不同的光质(由特定的光感受器依次感知)和下游的COP1-HY5/HYH模块微调生长素诱导的雄蕊伸长，从而调节雄性育性。

光感受器和COP1-HY5/HYH模块在花芽开放前后雄蕊伸长中的作用

文章链接：

https://onlinelibrary.wiley.com/doi/10.1111/tpj.14736

附：

Summary

In Arabidopsis stamen elongation, which ensures male fertility, is controlled by the auxin response factor ARF8, which regulates the expression of the auxin repressor IAA19. Here, we uncover a role of light in controlling stamen elongation. By an extensive genetic and molecular analysis, we show that the repressor of light signaling COP1, through its targets HY5 and HYH, controls stamen elongation, and that HY5‐oppositely to ARF8‐ directly represses IAA19 expression in stamens. In addition, we show that in closed flower buds, when light is shielded by sepals and petals, the blue light receptors CRY1/ CRY2 repress stamen elongation. Coherently, at flower disclosure and in subsequent stages stamen elongation is repressed by the red and far‐red light receptors PHYA/PHYB. In conclusion, different light qualities ‐ sequentially perceived by specific photoreceptors ‐ and the downstream COP1‐HY5/HYH module finely tune auxin‐induced stamen elongation and thus male fertility.