Defining the Site of Light Perception and Initiation of Phototropism in Arabidopsis
| Autor: | Christian Fankhauser, Tim Hohm, Tobias Preuten, Sven Bergmann |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
0106 biological sciences
genetic structures Arabidopsis Hypocotyl/metabolism Plant Roots/metabolism Plant Roots 01 natural sciences Hypocotyl Gene Expression Regulation Plant Phosphoproteins/genetics Phosphorylation Phototropism 0303 health sciences Seeds/metabolism biology Agricultural and Biological Sciences(all) Cotyledon/metabolism Intracellular Signaling Peptides and Proteins food and beverages Asymmetric growth Cell biology Phosphoproteins/metabolism Arabidopsis Proteins/genetics Intracellular Signaling Peptides and Proteins/metabolism Seedlings/metabolism Seeds Phototropism/physiology Phototropism/genetics Elongation General Agricultural and Biological Sciences Cotyledon Signal Transduction Protein-Serine-Threonine Kinases/genetics Phosphoproteins/biosynthesis Seedlings/genetics Protein Serine-Threonine Kinases Photosynthesis Arabidopsis/metabolism Arabidopsis Proteins/biosynthesis General Biochemistry Genetics and Molecular Biology 03 medical and health sciences Botany Membrane Proteins/genetics 030304 developmental biology Homeodomain Proteins Arabidopsis Proteins Biochemistry Genetics and Molecular Biology(all) fungi Golgi Matrix Proteins Membrane Proteins 15. Life on land Phosphoproteins biology.organism_classification Apex (geometry) Seedlings Seedling Arabidopsis Proteins/metabolism Membrane Proteins/metabolism Homeodomain Proteins/genetics Intracellular Signaling Peptides and Proteins/genetics 010606 plant biology & botany |
| Zdroj: | Current Biology Current Biology, vol. 23, no. 19, pp. 1934-1938 |
| ISSN: | 0960-9822 |
| DOI: | 10.1016/j.cub.2013.07.079 |
| Popis: | SummaryPhototropism is an adaptive response allowing plants to optimize photosynthetic light capture [1–7]. This is achieved by asymmetric growth between the shaded and lit sides of the stimulated organ [8, 9]. In grass seedlings, the site of phototropin-mediated light perception is distinct from the site of bending [10–12]; however, in dicotyledonous plants (e.g., Arabidopsis), spatial aspects of perception remain debatable. We use morphological studies and genetics to show that phototropism can occur in the absence of the root, lower hypocotyl, hypocotyl apex, and cotyledons. Tissue-specific expression of the phototropin1 (phot1) photoreceptor [13] demonstrates that light sensing occurs in the upper hypocotyl and that expression of phot1 in the hypocotyl elongation zone is sufficient to enable a normal phototropic response. Moreover, we show that efficient phototropism occurs when phot1 is expressed from endodermal, cortical, or epidermal cells and that its local activation rapidly leads to a global response throughout the seedling. We propose that spatial aspects in the steps leading from light perception to growth reorientation during phototropism differ between grasses and dicots. These results are important to properly interpret genetic experiments and establish a model connecting light perception to the growth response, including cellular and morphological aspects. |
| Databáze: | OpenAIRE |
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