Contrasting growth responses in lamina and petiole during neighbor detection depend on differential auxin responsiveness rather than different auxin levels.

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Version: Author's accepted manuscript
Serval ID
serval:BIB_8B888CBCE302
Type
Article: article from journal or magazin.
Collection
Publications
Title
Contrasting growth responses in lamina and petiole during neighbor detection depend on differential auxin responsiveness rather than different auxin levels.
Journal
New Phytologist
Author(s)
de Wit M., Ljung K., Fankhauser C.
ISSN
1469-8137 (Electronic)
ISSN-L
0028-646X
Publication state
Published
Issued date
2015
Volume
208
Number
1
Pages
198-209
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't Publication Status: ppublish
Abstract
Foliar shade triggers rapid growth of specific structures that facilitate access of the plant to direct sunlight. In leaves of many plant species, this growth response is complex because, although shade triggers the elongation of petioles, it reduces the growth of the lamina. How the same external cue leads to these contrasting growth responses in different parts of the leaf is not understood. Using mutant analysis, pharmacological treatment and gene expression analyses, we investigated the role of PHYTOCHROME INTERACTING FACTOR7 (PIF7) and the growth-promoting hormone auxin in these contrasting leaf growth responses. Both petiole elongation and lamina growth reduction are dependent on PIF7. The induction of auxin production is both necessary and sufficient to induce opposite growth responses in petioles vs lamina. However, these contrasting growth responses are not caused by different auxin concentrations in the two leaf parts. Our work suggests that a transient increase in auxin levels triggers tissue-specific growth responses in different leaf parts. We provide evidence suggesting that this may be caused by the different sensitivity to auxin in the petiole vs the blade and by tissue-specific gene expression.
Keywords
Arabidopsis/growth & development, Arabidopsis/metabolism, Arabidopsis Proteins/metabolism, DNA-Binding Proteins/metabolism, Darkness, Gene Expression, Indoleacetic Acids/metabolism, Light, Plant Leaves/growth & development, Plant Leaves/metabolism
Pubmed
Web of science
Create date
19/06/2015 16:12
Last modification date
20/08/2019 15:50
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