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PMID:19398336

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Citation

Hunt, L and Gray, JE (2009) The signaling peptide EPF2 controls asymmetric cell divisions during stomatal development. Curr. Biol. 19:864-9

Abstract

Stomata are pores in the plant epidermis that control carbon dioxide uptake and water loss. They are major regulators of global carbon and water cycles [1]. Several signaling components that regulate stomatal development have been characterized. These include a putative secretory peptide EPF1, LRR receptor components TMM and ER, and a peptidase SDD1 [2-4]. We have identified EPF2, a peptide related to EPF1 that is expressed in proliferating cells of the stomatal lineage, known as meristemoids, and in guard mother cells, the progenitors of stomata. EPF2 expression during leaf development affects stomatal density on the mature leaf. In the absence of EPF2, excessive numbers of cells enter the stomatal lineage and produce numerous small epidermal cells that express stomatal lineage reporter genes, whereas plants overexpressing EPF2 produce virtually no stomata. Results from genetic experiments indicate that EPF2 regulates a different aspect of stomatal development to EPF1 and are consistent with EPF2 acting in a pathway to regulate stomatal density that involves ER and TMM, but not SDD1. We propose that EPF2 is expressed earlier in leaf development than EPF1 and is involved in determining the number of cells that enter, and remain in, the stomatal lineage.

Links

PubMed Online version:10.1016/j.cub.2009.03.069

Keywords

Amino Acid Sequence; Arabidopsis/anatomy & histology; Arabidopsis/physiology; Arabidopsis Proteins/genetics; Arabidopsis Proteins/metabolism; Cell Division/physiology; Cell Lineage; DNA-Binding Proteins/genetics; DNA-Binding Proteins/metabolism; Molecular Sequence Data; Peptides/genetics; Peptides/metabolism; Plant Stomata/cytology; Plant Stomata/growth & development; Plant Stomata/metabolism; Recombinant Fusion Proteins/genetics; Recombinant Fusion Proteins/metabolism; Signal Transduction/physiology; Transcription Factors/genetics; Transcription Factors/metabolism

Significance

Annotations

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

ARATH:EPF2

acts_upstream_of_or_within

GO:0010374: stomatal complex development

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:EPF2

acts_upstream_of_or_within

GO:0010052: guard cell differentiation

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:EPF1

acts_upstream_of_or_within

GO:0010374: stomatal complex development

ECO:0000316: genetic interaction evidence used in manual assertion

AGI_LocusCode:AT1G34245

P

Seeded From UniProt

complete


See also

References

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