Initial characterization of shade avoidance response suggests functional diversity betweenPopulusphytochrome B genes
| Autor: | Gerald A. Tuskan, Sara M. Allen, Stan D. Wullschleger, Abhijit Karve, Lee E. Gunter, Xiaohan Yang, David J. Weston, Sara S. Jawdy |
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| Rok vydání: | 2012 |
| Předmět: |
Light
Transcription Genetic Physiology Arabidopsis Plant Science Genes Plant Real-Time Polymerase Chain Reaction chemistry.chemical_compound Shade avoidance Cell Wall Gene Expression Regulation Plant Phytochrome B Brassinosteroids Botany Brassinosteroid Cloning Molecular Cell wall modification Plant Physiological Phenomena Cell Nucleus Regulation of gene expression Phytochrome biology Arabidopsis Proteins Sequence Analysis RNA Gene Expression Profiling Protoplasts Genetic Complementation Test fungi Far-red Plants Genetically Modified biology.organism_classification Cell biology Gene expression profiling Phenotype Populus chemistry RNA Plant Plasmids Signal Transduction |
| Zdroj: | New Phytologist. 196:726-737 |
| ISSN: | 1469-8137 0028-646X |
| DOI: | 10.1111/j.1469-8137.2012.04288.x |
| Popis: | Shade avoidance signaling involves perception of incident red/far-red (R/FR) light by phytochromes (PHYs) and modulation of downstream transcriptional networks. Although these responses are well studied in Arabidopsis, little is known about the role of PHYs and the transcriptional responses to shade in the woody perennial Populus. Tissue expression and subcellular localization of Populus PHYs was studied by quantitative real-time PCR (qRT-PCR) and protoplast transient assay. Transgenic lines with altered PHYB1 and/or PHYB2 expression were used in phenotypic assays and transcript profiling with qRT-PCR. RNA-Seq was used to identify transcriptional responses to enriched FR light. All three PHYs were differentially expressed among tissue types and PHYBs were targeted to the nucleus under white light. Populus PHYB1 rescued Arabidopsis phyB mutant phenotypes. Phenotypes of Populus transgenic lines and the expression of candidate shade response genes suggested that PHYB1 and PHYB2 have distinct yet overlapping functions. RNA-Seq analysis indicated that genes associated with cell wall modification and brassinosteroid signaling were induced under enriched FR light in Populus. This study is an initial attempt at deciphering the role of Populus PHYs by evaluating transcriptional reprogramming to enriched FR and demonstrates functional diversity and overlap of the Populus PHYB1 and PHYB2 in regulating shade responses. |
| Databáze: | OpenAIRE |
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