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PMID:10465788

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Citation

Yang, WC, Ye, D, Xu, J and Sundaresan, V (1999) The SPOROCYTELESS gene of Arabidopsis is required for initiation of sporogenesis and encodes a novel nuclear protein. Genes Dev. 13:2108-17

Abstract

The formation of haploid spores marks the initiation of the gametophytic phase of the life cycle of all vascular plants ranging from ferns to angiosperms. In angiosperms, this process is initiated by the differentiation of a subset of floral cells into sporocytes, which then undergo meiotic divisions to form microspores and megaspores. Currently, there is little information available regarding the genes and proteins that regulate this key step in plant reproduction. We report here the identification of a mutation, SPOROCYTELESS (SPL), which blocks sporocyte formation in Arabidopsis thaliana. Analysis of the SPL mutation suggests that development of the anther walls and the tapetum and microsporocyte formation are tightly coupled, and that nucellar development may be dependent on megasporocyte formation. Molecular cloning of the SPL gene showed that it encodes a novel nuclear protein related to MADS box transcription factors and that it is expressed during microsporogenesis and megasporogenesis. These data suggest that the SPL gene product is a transcriptional regulator of sporocyte development in Arabidopsis.

Links

PubMed PMC316961

Keywords

Amino Acid Sequence; Arabidopsis/genetics; Arabidopsis/growth & development; Arabidopsis Proteins; Base Sequence; DNA, Plant; Genes, Plant; Humans; Molecular Sequence Data; Mutation; Nuclear Proteins/genetics; Nuclear Proteins/metabolism; Nuclear Proteins/physiology; Plant Proteins/genetics; Plant Proteins/physiology; Repressor Proteins; Sequence Homology, Amino Acid; Spores; Transcription Factors/genetics; Transcription Factors/metabolism; Transcription Factors/physiology

Significance

Annotations

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

ARATH:SPL

located_in

GO:0005634: nucleus

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

ARATH:SPL

acts_upstream_of_or_within

GO:0048533: sporocyte differentiation

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:SPL

enables

GO:0003700: DNA-binding transcription factor activity

ECO:0000250: sequence similarity evidence used in manual assertion

F

Seeded From UniProt

complete

ARATH:SPL

enables

GO:0005515: protein binding

ECO:0000353: physical interaction evidence used in manual assertion

AGI_LocusCode:AT2G45190

F

Seeded From UniProt

complete


See also

References

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