Shade suppresses wound-induced leaf repositioning through a mechanism involving PHYTOCHROME KINASE SUBSTRATE (PKS) genes.

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License: CC BY 4.0
Serval ID
serval:BIB_695BD5E44D8A
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Shade suppresses wound-induced leaf repositioning through a mechanism involving PHYTOCHROME KINASE SUBSTRATE (PKS) genes.
Journal
PLoS genetics
Author(s)
Fiorucci A.S., Michaud O., Schmid-Siegert E., Trevisan M., Allenbach Petrolati L., Çaka Ince Y., Fankhauser C.
ISSN
1553-7404 (Electronic)
ISSN-L
1553-7390
Publication state
Published
Issued date
05/2022
Peer-reviewed
Oui
Volume
18
Number
5
Pages
e1010213
Language
english
Notes
Publication types: Journal Article
Publication Status: epublish
Abstract
Shaded plants challenged with herbivores or pathogens prioritize growth over defense. However, most experiments have focused on the effect of shading light cues on defense responses. To investigate the potential interaction between shade-avoidance and wounding-induced Jasmonate (JA)-mediated signaling on leaf growth and movement, we used repetitive mechanical wounding of leaf blades to mimic herbivore attacks. Phenotyping experiments with combined treatments on Arabidopsis thaliana rosettes revealed that shade strongly inhibits the wound effect on leaf elevation. By contrast, petiole length is reduced by wounding both in the sun and in the shade. Thus, the relationship between the shade and wounding/JA pathways varies depending on the physiological response, implying that leaf growth and movement can be uncoupled. Using RNA-sequencing, we identified genes with expression patterns matching the hyponastic response (opposite regulation by both stimuli, interaction between treatments with shade dominating the wound signal). Among them were genes from the PKS (Phytochrome Kinase Substrate) family, which was previously studied for its role in phototropism and leaf positioning. Interestingly, we observed reduced shade suppression of the wounding effect in pks2pks4 double mutants while a PKS4 overexpressing line showed constitutively elevated leaves and was less sensitive to wounding. Our results indicate a trait-specific interrelationship between shade and wounding cues on Arabidopsis leaf growth and positioning. Moreover, we identify PKS genes as integrators of external cues in the control of leaf hyponasty further emphasizing the role of these genes in aerial organ positioning.
Keywords
Arabidopsis, Arabidopsis Proteins/genetics, Arabidopsis Proteins/metabolism, Gene Expression Regulation, Plant, Light, Phytochrome/genetics, Plant Leaves
Pubmed
Open Access
Yes
Create date
17/06/2022 14:07
Last modification date
23/11/2022 8:11
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