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- Title
The zinc finger protein Pta ZFP2 negatively controls stem growth and gene expression responsiveness to external mechanical loads in poplar.
- Authors
Martin, Ludovic; Decourteix, Mélanie; Badel, Eric; Huguet, Stéphanie; Moulia, Bruno; Julien, Jean‐Louis; Leblanc‐Fournier, Nathalie
- Abstract
Mechanical cues are essential signals regulating plant growth and development. In response to wind, trees develop a thigmomorphogenetic response characterized by a reduction in longitudinal growth, an increase in diameter growth, and changes in mechanical properties. The molecular mechanisms behind these processes are poorly understood. In poplar, Pta ZFP2, a C2 H2 transcription factor, is rapidly up-regulated after stem bending., To investigate the function of Pta ZFP2, we analyzed Pta ZFP2-overexpressing poplars ( Populus tremula × Populus alba). To unravel the genes downstream Pta ZFP2, a transcriptomic analysis was performed., Pta ZFP2-overexpressing poplars showed longitudinal and cambial growth reductions together with an increase in the tangent and hardening plastic moduli. The regulation level of mechanoresponsive genes was much weaker after stem bending in Pta ZFP2-overexpressing poplars than in wild-type plants, showing that Pta ZFP2 negatively modulates plant responsiveness to mechanical stimulation. Microarray analysis revealed a high proportion of down-regulated genes in Pta ZFP2-overexpressing poplars. Among these genes, several were also shown to be regulated by mechanical stimulation., Our results confirmed the important role of Pta ZFP2 during plant acclimation to mechanical load, in particular through a negative control of plant molecular responsiveness. This desensitization process could modulate the amplitude and duration of the plant response during recurrent stimuli.
- Subjects
DEVELOPMENTAL biology; HEREDITY; PLANT mechanics; TRANSCRIPTION factors; GENES
- Publication
New Phytologist, 2014, Vol 203, Issue 1, p168
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/nph.12781