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PMID:20230490

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Citation

Lewis, MW, Leslie, ME, Fulcher, EH, Darnielle, L, Healy, PN, Youn, JY and Liljegren, SJ (2010) The SERK1 receptor-like kinase regulates organ separation in Arabidopsis flowers. Plant J. 62:817-28

Abstract

Through a sensitized screen for novel components of pathways regulating organ separation in Arabidopsis flowers, we have found that the leucine-rich repeat receptor-like kinase SOMATIC EMBRYOGENESIS RECEPTOR-LIKE KINASE1 (SERK1) acts as a negative regulator of abscission. Mutations in SERK1 dominantly rescue abscission in flowers without functional NEVERSHED (NEV), an ADP-ribosylation factor GTPase-activating protein required for floral organ shedding. We previously reported that the organization of the Golgi apparatus and location of the trans-Golgi network (TGN) are altered in nev mutant flowers. Disruption of SERK1 restores Golgi structure and the close association of the TGN in nev flowers, suggesting that defects in these organelles may be responsible for the block in abscission. We have also found that the abscission zones of nev serk1 flowers are enlarged compared to wild-type. A similar phenotype was previously observed in plants constitutively expressing a putative ligand required for organ separation, INFLORESCENCE DEFICIENT IN ABSCISSION (IDA), suggesting that signalling through IDA and its proposed receptors, HAESA and HAESA-LIKE2, may be deregulated in nev serk1 abscission zone cells. Our studies indicate that in addition to its previously characterized roles in stamen development and brassinosteroid perception, SERK1 plays a unique role in modulating the loss of cell adhesion that occurs during organ abscission.

Links

PubMed PMC2884084 Online version:10.1111/j.1365-313X.2010.04194.x

Keywords

Arabidopsis/genetics; Arabidopsis/growth & development; Arabidopsis/metabolism; Arabidopsis Proteins/genetics; Arabidopsis Proteins/metabolism; Chromosome Mapping; Flowers/growth & development; Flowers/ultrastructure; Gene Expression Regulation, Developmental; Gene Expression Regulation, Plant; Golgi Apparatus/metabolism; Microscopy, Electron, Transmission; Mutation; Phenotype; Protein Kinases/genetics; Protein Kinases/metabolism

Significance

Annotations

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

ARATH:SERK1

acts_upstream_of_or_within

GO:0007030: Golgi organization

ECO:0000316: genetic interaction evidence used in manual assertion

AGI_LocusCode:AT5G54310

P

Seeded From UniProt

complete

ARATH:SERK1

acts_upstream_of_or_within

GO:0010227: floral organ abscission

ECO:0000316: genetic interaction evidence used in manual assertion

AGI_LocusCode:AT5G54310

P

Seeded From UniProt

complete

ARATH:SERK1

involved_in

GO:0010227: floral organ abscission

ECO:0000316: genetic interaction evidence used in manual assertion

AGI_LocusCode:AT5G54310

P

Seeded From UniProt

complete

ARATH:SERK1

involved_in

GO:0007030: Golgi organization

ECO:0000316: genetic interaction evidence used in manual assertion

AGI_LocusCode:AT5G54310

P

Seeded From UniProt

complete


See also

References

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