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Defining the site of light perception and initiation of phototropism in Arabidopsis.
- Source :
-
Current biology : CB [Curr Biol] 2013 Oct 07; Vol. 23 (19), pp. 1934-8. Date of Electronic Publication: 2013 Sep 26. - Publication Year :
- 2013
-
Abstract
- Phototropism is an adaptive response allowing plants to optimize photosynthetic light capture. This is achieved by asymmetric growth between the shaded and lit sides of the stimulated organ. In grass seedlings, the site of phototropin-mediated light perception is distinct from the site of bending; 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 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.<br /> (Copyright © 2013 Elsevier Ltd. All rights reserved.)
- Subjects :
- Arabidopsis Proteins biosynthesis
Arabidopsis Proteins genetics
Cotyledon metabolism
Gene Expression Regulation, Plant
Golgi Matrix Proteins
Homeodomain Proteins genetics
Intracellular Signaling Peptides and Proteins genetics
Intracellular Signaling Peptides and Proteins metabolism
Membrane Proteins genetics
Membrane Proteins metabolism
Phosphoproteins biosynthesis
Phosphoproteins genetics
Phosphorylation
Plant Roots metabolism
Protein Serine-Threonine Kinases genetics
Seedlings genetics
Seedlings metabolism
Seeds metabolism
Signal Transduction
Arabidopsis metabolism
Arabidopsis Proteins metabolism
Hypocotyl metabolism
Phosphoproteins metabolism
Phototropism genetics
Phototropism physiology
Subjects
Details
- Language :
- English
- ISSN :
- 1879-0445
- Volume :
- 23
- Issue :
- 19
- Database :
- MEDLINE
- Journal :
- Current biology : CB
- Publication Type :
- Academic Journal
- Accession number :
- 24076239
- Full Text :
- https://doi.org/10.1016/j.cub.2013.07.079