SPL8, an SBP-Box Gene That Affects Pollen Sac Development in Arabidopsis

SQUAMOSA PROMOTER BINDING PROTEIN-box genes (SBP-box genes) encode plant-specific proteins that share a highly conserved DNA binding domain, the SBP domain. Although likely to represent transcription factors, little is known about their role in development. In Arabidopsis, SBP-box genes constitute a...

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Bibliographic Details
Published in:The Plant cell 2003-04, Vol.15 (4), p.1009-1019
Main Authors: Unte, Ulrike S., Sorensen, Anna-Marie, Pesaresi, Paolo, Gandikota, Madhuri, Leister, Dario, Saedler, Heinz, Huijser, Peter
Format: Article
Language:English
Subjects:
Alleles
Amino Acid Sequence
Anthers
Arabidopsis - genetics
Arabidopsis - growth & development
Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
Base Sequence
Cell Surface Extensions - genetics
Cell Surface Extensions - physiology
DNA Transposable Elements - genetics
DNA-Binding Proteins - genetics
DNA-Binding Proteins - metabolism
Fertility
Flowers
Flowers - genetics
Flowers - growth & development
Flowers - ultrastructure
Gene Expression Regulation, Developmental
Gene Expression Regulation, Plant
Genes
In Situ Hybridization
Inflorescences
Meiosis
Microscopic analysis
Microscopy, Electron, Scanning
Molecular Sequence Data
Multigene Family
Mutation
Ovules
Phenotype
Plants
Pollen
Reproduction
Sequence Analysis, DNA
Sequence Homology, Amino Acid
Sequence Homology, Nucleic Acid
Transcription Factors - genetics
Transcription Factors - metabolism
Transposons
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Summary:SQUAMOSA PROMOTER BINDING PROTEIN-box genes (SBP-box genes) encode plant-specific proteins that share a highly conserved DNA binding domain, the SBP domain. Although likely to represent transcription factors, little is known about their role in development. In Arabidopsis, SBP-box genes constitute a structurally heterogeneous family of 16 members known as SPL genes. For one of these genes, SPL8, we isolated three independent transposon-tagged mutants, all of which exhibited a strong reduction in fertility. Microscopic analysis revealed that this reduced fertility is attributable primarily to abnormally developed microsporangia, which exhibit premeiotic abortion of the sporocytes. In addition to its role in microsporogenesis, the SPL8 knockout also seems to affect megasporogenesis, trichome formation on sepals, and stamen filament elongation. The SPL8 mutants described help to uncover the roles of SBP-box genes in plant development.
ISSN:1040-4651
1532-298X
DOI:10.1105/tpc.010678