赤霉素
拟南芥
发芽
抑制因子
串扰
光敏色素
植物
生物
脱落酸
细胞生物学
野生型
基因表达
基因
生物化学
突变体
红灯
物理
光学
作者
Peipei Xu,Jinbo Hu,Haiying Chen,Weiming Cai
出处
期刊:Cell Reports
[Elsevier]
日期:2023-07-01
卷期号:42 (7): 112740-112740
被引量:7
标识
DOI:10.1016/j.celrep.2023.112740
摘要
Karrikins (KARs) were first identified as a class of small-molecule chemicals derived from smoke that promote seed germination. However, the implied mechanism is still not well understood. Here, we find that KAR signaling mutants have a lower germination percentage than that of wild type under weak light conditions, and KARs promote seed germination through transcriptional activation of gibberellin (GA) biosynthesis via SMAX1. SMAX1 interacts with the DELLA proteins REPRESSOR of ga1-3-LIKE 1 (RGL1) and RGL3. The interaction enhances the transcriptional activity of SMAX1 and inhibits GIBBERELLIN 3-oxidase 2 (GA3ox2) gene expression. The KAR signaling mutant seed germination defect under weak light is partially rescued by exogenous application of GA3 or by GA3ox2 overexpression, and the rgl1 rgl3 smax1 triple mutant exhibits higher germination rates under weak light than the smax1 mutant. Thus, we show a crosstalk between KAR and GA signaling pathways via a SMAX1-DELLA module in regulating seed germination in Arabidopsis.
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