司他内酯
赤霉素
生物
串扰
转录因子
细胞生物学
氮气循环
拟南芥
信号转导
代谢途径
抑制因子
发起人
新陈代谢
基因
氮气
基因表达
生物化学
植物
突变体
化学
有机化学
物理
光学
作者
Huwei Sun,Xiaoli Guo,Xiuli Zhu,Pengyuan Gu,Wei Zhang,Wenqing Tao,Daojian Wang,Yunzhe Wu,Quanzhi Zhao,Guohua Xu,Xiang‐Dong Fu,Yali Zhang
标识
DOI:10.1016/j.molp.2023.01.009
摘要
Modern semi-dwarf rice varieties of the "Green Revolution" require a high supply of nitrogen (N) fertilizer to produce high yields. A better understanding of the interplay between N metabolism and plant developmental processes is required for improved N-use efficiency and agricultural sustainability. Here, we show that strigolactones (SLs) modulate root metabolic and developmental adaptations to low N availability for ensuring efficient uptake and translocation of available N. The key repressor DWARF 53 (D53) of the SL signaling pathway interacts with the transcription factor GROWTH-REGULATING FACTOR 4 (GRF4) and prevents GRF4 from binding to its target gene promoters. N limitation induces the accumulation of SLs, which in turn promotes SL-mediated degradation of D53, leading to the release of GRF4 and thus promoting the expression of genes associated with N metabolism. N limitation also induces degradation of the DELLA protein SLENDER RICE 1 (SLR1) in an D14- and D53-dependent manner, effectively releasing GRF4 from competitive inhibition caused by SLR1. Collectively, our findings reveal a previously unrecognized mechanism underlying SL and gibberellin crosstalk in response to N availability, advancing our understanding of plant growth-metabolic coordination and facilitating the design of the strategies for improving N-use efficiency in high-yield crops.
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