SPOC domain-containing protein Leaf inclination3 interacts with LIP1 to regulate rice leaf inclination through auxin signaling

Leaf angle is an important agronomic trait and influences crop architecture and yield. Studies have demonstrated the roles of phytohormones, particularly auxin and brassinosteroids, and various factors in controlling leaf inclination. However, the underlying mechanism especially the upstream regulat...

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Bibliographic Details
Published in:PLoS genetics 2018-11, Vol.14 (11), p.e1007829-e1007829
Main Authors: Chen, Su-Hui, Zhou, Li-Juan, Xu, Ping, Xue, Hong-Wei
Format: Article
Language:English
Subjects:
Auxins
Biology and Life Sciences
Brassinosteroids
Cell cycle
Cell division
Cellular signal transduction
Criminal investigation
CRISPR
DNA binding proteins
Engineering and Technology
Gene Expression Regulation, Developmental
Gene Expression Regulation, Plant
Gene Knockout Techniques
Genes
Genes, Plant
Genetic aspects
Genetic engineering
Genetically modified plants
Genomes
Gibberellins
Homeostasis
Indoleacetic Acids - metabolism
Integrated software
Kinases
Laboratories
Leaf angle
Leaves
Models, Biological
Observations
Oryza
Oryza - genetics
Oryza - growth & development
Oryza - metabolism
Physiological aspects
Physiology
Plant Growth Regulators - metabolism
Plant hormones
Plant Leaves - anatomy & histology
Plant Leaves - growth & development
Plant Leaves - metabolism
Plant Proteins - genetics
Plant Proteins - metabolism
Plant sciences
Plants, Genetically Modified
Protein deficiency
Proteins
Quantitative trait loci
Repressor Proteins - genetics
Repressor Proteins - metabolism
Research and Analysis Methods
Rice
Seeds
Signal Transduction
Steroids (Organic compounds)
Transcription
Transgenic plants
Zinc finger proteins
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Summary:Leaf angle is an important agronomic trait and influences crop architecture and yield. Studies have demonstrated the roles of phytohormones, particularly auxin and brassinosteroids, and various factors in controlling leaf inclination. However, the underlying mechanism especially the upstream regulatory networks still need being clarified. Here we report the functional characterization of rice leaf inclination3 (LC3), a SPOC domain-containing transcription suppressor, in regulating leaf inclination through interacting with LIP1 (LC3-interacting protein 1), a HIT zinc finger domain-containing protein. LC3 deficiency results in increased leaf inclination and enhanced expressions of OsIAA12 and OsGH3.2. Being consistent, transgenic plants with OsIAA12 overexpression or deficiency of OsARF17 which interacts with OsIAA12 do present enlarged leaf inclination. LIP1 directly binds to promoter regions of OsIAA12 and OsGH3.2, and interacts with LC3 to synergistically suppress auxin signaling. Our study demonstrate the distinct effects of IAA12-ARF17 interactions in leaf inclination regulation, and provide informative clues to elucidate the functional mechanism of SPOC domain-containing transcription suppressor and fine-controlled network of lamina joint development by LC3-regulated auxin homeostasis and auxin signaling through.
ISSN:1553-7404
1553-7390
1553-7404
DOI:10.1371/journal.pgen.1007829