缺铁影响全球作物生产力和人类健康。然而，光信号在植物铁吸收中的作用尚不清楚。在这里，我们发现光诱导番茄铁的吸收在很大程度上依赖于光敏色素B（phyB）。光诱导叶片和根中伸长的下胚轴5（HY5）蛋白的phyB依赖性积累。HY5从地上部到根部的运动激活了铁转运子转录因子的表达，导致参与铁吸收的转录物的积累。铁素受体的突变消除了光质引起的铁吸收变化。
在phyB、hy5和fer突变体中观察到的低铁吸收伴随着较低的光合电子传递速率。夜间红光照射增加了野生型果实铁的积累，但对phyB突变体的果实影响不大。
综上所述，这些结果表明，铁的吸收是由光以phyB-HY5-FER依赖的方式进行系统调节的。这些发现提供了新的见解如何操纵光质可以用来提高铁的吸收，从而提高作物的营养质量。
红光激活的光敏色素 b (phyB)在铁的吸收中起着关键作用。phyB 诱导延长的下胚轴5(HY5)蛋白在芽中的积累。HY5从地上部到根部的运动直接激活根系的 FER 表达，从而促进铁的吸收。
Iron (Fe) deficiency affects global crop productivity and human health. However, the role of light signaling in plant Fe uptake remains uncharacterized. Here, we find that light-induced Fe uptake in tomato (Solanum lycopersicum L.) is largely dependent on phytochrome B (phyB). Light induces the phyB-dependent accumulation of ELONGATED HYPOCOTYL 5 (HY5) protein both in the leaves and roots. HY5 movement from shoots to roots activates the expression of FER transcription factor, leading to the accumulation of transcripts involved in Fe uptake. Mutation in FER abolishes the light quality-induced changes in Fe uptake. The low Fe uptake observed in phyB, hy5, and fer mutants is accompanied by lower photosynthetic electron transport rates. Exposure to red light at night increases Fe accumulation in wild-type fruit but has little effects on fruit of phyB mutants. Taken together, these results demonstrate that Fe uptake is systemically regulated by light in a phyB-HY5-FER-dependent manner. These findings provide new insights how the manipulation of light quality could be used to improve Fe uptake and hence the nutritional quality of crops.
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