Document Detail

Antagonistic interaction of BLADE-ON-PETIOLE1 and 2 with BREVIPEDICELLUS and PENNYWISE regulates Arabidopsis inflorescence architecture.
MedLine Citation:
PMID:  22114095     Owner:  NLM     Status:  MEDLINE    
The transition to flowering in many plant species, including Arabidopsis (Arabidopsis thaliana), is marked by the elongation of internodes to make an inflorescence upon which lateral branches and flowers are arranged in a characteristic pattern. Inflorescence patterning relies in part on the activities of two three-amino-acid loop-extension homeodomain transcription factors: BREVIPEDICELLUS (BP) and PENNYWISE (PNY) whose interacting products also promote meristem function. We examine here the genetic interactions between BP-PNY whose expression is up-regulated in stems at the floral transition, and the lateral organ boundary genes BLADE-ON-PETIOLE1 (BOP1) and BOP2, whose expression is restricted to pedicel axils. Our data show that bp and pny inflorescence defects are caused by BOP1/2 gain of function in stems and pedicels. Compatible with this, inactivation of BOP1/2 rescues these defects. BOP expression domains are differentially enlarged in bp and pny mutants, corresponding to the distinctive patterns of growth restriction in these mutants leading to compacted internodes and clustered or downward-oriented fruits. Our data indicate that BOP1/2 are positive regulators of KNOTTED1-LIKE FROM ARABIDOPSIS THALIANA6 expression and that growth restriction in BOP1/2 gain-of-function plants requires KNOTTED1-LIKE FROM ARABIDOPSIS THALIANA6. Antagonism between BOP1/2 and BP is explained in part by their reciprocal regulation of gene expression, as evidenced by the identification of lignin biosynthetic genes that are repressed by BP and activated by BOP1/2 in stems. These data reveal BOP1/2 gain of function as the basis of bp and pny inflorescence defects and reveal how antagonism between BOP1/2 and BP-PNY contributes to inflorescence patterning in a model plant species.
Madiha Khan; Mingli Xu; Jhadeswar Murmu; Paul Tabb; Yuanyuan Liu; Kathryn Storey; Sarah M McKim; Carl J Douglas; Shelley R Hepworth
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-11-23
Journal Detail:
Title:  Plant physiology     Volume:  158     ISSN:  1532-2548     ISO Abbreviation:  Plant Physiol.     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-02-06     Completed Date:  2012-06-20     Revised Date:  2013-06-27    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  946-60     Citation Subset:  IM    
Department of Biology, Carleton University, Ottawa, Ontario, Canada K1S 5B6.
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MeSH Terms
Arabidopsis / genetics,  metabolism,  physiology*
Arabidopsis Proteins / genetics,  metabolism,  physiology*
Genes, Plant
Lignin / metabolism
Reg. No./Substance:
0/Arabidopsis Proteins; 9005-53-2/Lignin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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