Regulation of ARGONAUTE10 Expression Enables Temporal and Spatial Precision in Axillary Meristem Initiation in Arabidopsis

第一作者：Cui Zhang

第一单位：深圳大学

通讯作者：Xuemei Chen

 Abstract 

背景回顾：Axillary meristems (AMs) give rise to lateral shoots and are critical to plant architecture.

研究意义：Understanding how developmental cues and environmental signals impact AM development will enable the improvement of plant architecture in agriculture.

主要发现：Here, we show that ARGONAUTE10 (AGO10), which sequesters miR165/166, promotes AM development through the miR165/166 target gene REVOLUTA.

结果1-调控AGO10的刺激：We reveal that AGO10 expression is precisely controlled temporally and spatially by auxin, brassinosteroids, and light to result in AM initiation only in the axils of leaves at a certain age.

结果2-调控AGO10的基因：AUXIN RESPONSE FACTOR 5 (ARF5) activates while BRASSINAZOLE-RESISTANT 1 (BZR1) and PHYTOCHROME-INTERACTING FACTOR 4 (PIF4) repress AGO10 transcription directly. 

结果3-AGO10的精确时空调控：In axils of young leaves, BZR1 and PIF4 repress AGO10 expression to prevent AM initiation. In axils of older leaves, ARF5 upregulates AGO10 expression to promote AM initiation.

结论：Our results uncover the spatiotemporal control of AM development through the cooperation of hormones and light converging on a regulator of microRNA.

doi: 10.1016/j.devcel.2020.10.019

Journal: Developmental Cell

Published date: Nov 23, 2020