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PMID:20118228

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Citation

Jun, JH, Ha, CM and Fletcher, JC (2010) BLADE-ON-PETIOLE1 coordinates organ determinacy and axial polarity in arabidopsis by directly activating ASYMMETRIC LEAVES2. Plant Cell 22:62-76

Abstract

Continuous organ formation is a hallmark of plant development that requires organ-specific gene activity to establish determinacy and axial patterning, yet the molecular mechanisms that coordinate these events remain poorly understood. Here, we show that the organ-specific BTB-POZ domain proteins BLADE-ON-PETIOLE1 (BOP1) and BOP2 function as transcriptional activators during Arabidopsis thaliana leaf formation. We identify as a direct target of BOP1 induction the ASYMMETRIC LEAVES2 (AS2) gene, which promotes leaf cell fate specification and adaxial polarity. We find that BOP1 associates with the AS2 promoter and that BOP1 and BOP2 are required for AS2 activation specifically in the proximal, adaxial region of the leaf, demonstrating a role for the BOP proteins as proximal-distal as well as adaxial-abaxial patterning determinants. Furthermore, repression of BOP1 and BOP2 expression by the indeterminacy-promoting KNOX gene SHOOTMERISTEMLESS is critical to establish a functional embryonic shoot apical meristem. Our data indicate that direct activation of AS2 transcription by BOP1 and BOP2 is vital for generating the conditions for KNOX repression at the leaf base and may represent a conserved mechanism for coordinating leaf morphogenesis with patterning along the adaxial-abaxial and the proximal-distal axes.

Links

PubMed PMC2828709 Online version:10.1105/tpc.109.070763

Keywords

Arabidopsis/genetics; Arabidopsis/growth & development; Arabidopsis Proteins/genetics; Arabidopsis Proteins/metabolism; Binding Sites; Gene Expression Regulation, Developmental; Gene Expression Regulation, Plant; Meristem/genetics; Meristem/growth & development; Plant Leaves/genetics; Plant Leaves/growth & development; Plants, Genetically Modified/genetics; Plants, Genetically Modified/growth & development; Promoter Regions, Genetic; RNA, Plant/genetics; Transcription Factors/genetics; Transcription Factors/metabolism; Transcriptional Activation

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

ARATH:NPR6

located_in

GO:0005634: nucleus

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

ARATH:NPR6

located_in

GO:0005737: cytoplasm

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete


See also

References

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