A genetic framework for regulation and seasonal adaptation of shoot architecture in hybrid aspen
- 11 May 2020
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 117 (21), 11523-11530
- https://doi.org/10.1073/pnas.2004705117
Abstract
Shoot architecture is critical for optimizing plant adaptation and productivity. In contrast with annuals, branching in perennials native to temperate and boreal regions must be coordinated with seasonal growth cycles. How branching is coordinated with seasonal growth is poorly understood. We identified key components of the genetic network that controls branching and its regulation by seasonal cues in the model tree hybrid aspen. Our results demonstrate that branching and its control by seasonal cues is mediated by mutually antagonistic action of aspen orthologs of the flowering regulators TERMINAL FLOWER 1 (TFL1) and APETALA1 (LIKE APETALA 1/LAP1). LAP1 promotes branching through local action in axillary buds. LAP1 acts in a cytokinin-dependent manner, stimulating expression of the cell-cycle regulator AIL1 and suppressing BRANCHED1 expression to promote branching. Short photoperiod and low temperature, the major seasonal cues heralding winter, suppress branching by simultaneous activation of TFL1 and repression of the LAP1 pathway. Our results thus reveal the genetic network mediating control of branching and its regulation by environmental cues facilitating integration of branching with seasonal growth control in perennial trees.Keywords
Funding Information
- Knut och Alice Wallenbergs Stiftelse (2014-0032)
This publication has 64 references indexed in Scilit:
- The Pea TCP Transcription Factor PsBRC1 Acts Downstream of Strigolactones to Control Shoot BranchingPlant Physiology, 2011
- ArabidopsisTERMINAL FLOWER1 Is Involved in the Regulation of Flowering Time and Inflorescence Development through Transcriptional RepressionPlant Cell, 2011
- FLOWERING LOCUS T duplication coordinates reproductive and vegetative growth in perennial poplarProceedings of the National Academy of Sciences, 2011
- Orchestration of Floral Initiation by APETALA1Science, 2010
- Strigolactone Acts Downstream of Auxin to Regulate Bud Outgrowth in Pea and ArabidopsisPlant Physiology, 2009
- Roles for Auxin, Cytokinin, and Strigolactone in Regulating Shoot BranchingPlant Physiology, 2009
- Cytokinin signaling regulates cambial development in poplarProceedings of the National Academy of Sciences, 2008
- Recombinational Cloning with Plant Gateway VectorsPlant Physiology, 2007
- Arabidopsis BRANCHED1Acts as an Integrator of Branching Signals within Axillary BudsPlant Cell, 2007
- TheArabidopsisHistidine Phosphotransfer Proteins Are Redundant Positive Regulators of Cytokinin SignalingPlant Cell, 2006