期刊
出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2106961118
关键词
lateral root; metabolic homeostasis; SnRK1; ARF19; bZIP63
资金
- Deutsche Forschungsgesellschaft [DR273/10-6]
- Bayer Foundation
- Max Planck Society
- Austrian Science Fund [P-28491]
Plants adjust their energy metabolism to adapt to continuous environmental fluctuations, resulting in a high plasticity in their structure. In Arabidopsis, changes in photosynthetic activity lead to increased lateral root initiation, a response that requires the metabolic stress sensor kinase SnRK1.
Plants adjust their energy metabolism to continuous environmental fluctuations, resulting in a tremendous plasticity in their architecture. The regulatory circuits involved, however, remain largely unresolved. In Arabidopsis, moderate perturbations in photosynthetic activity, administered by short-term low light exposure or unexpected darkness, lead to increased lateral root (LR) initiation. Consistent with expression of low-energy markers, these treatments alter energy homeostasis and reduce sugar availability in roots. Here, we demonstrate that the LR response requires the metabolic stress sensor kinase Snf1-RELATED-KINASE1 (SnRK1), which phosphorylates the transcription factor BASIC LEUCINE ZIPPER63 (bZIP63) that directly binds and activates the promoter of AUXIN RESPONSE FACTOR19 (ARF19), a key regulator of LR initiation. Consistently, starvation-induced ARF19 transcription is impaired in bzip63 mutants. This study highlights a positive developmental function of SnRK1. During energy limitation, LRs are initiated and primed for outgrowth upon recovery. Hence, this study provides mechanistic insights into how energy shapes the agronomically important root system.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据