Stamina pistilloida, the Pea Ortholog of Fim and UFO, Is Required for Normal Development of Flowers, Inflorescences, and Leaves

Isolation and characterization of two severe alleles at the Stamina pistilloida (Stp) locus reveals that Stp is involved in a wide range of developmental processes in the garden pea. The most severe allele, stp-4, results in flowers consisting almost entirely of sepals and carpels. Production of ect...

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Bibliographic Details
Published in:The Plant cell 2001-01, Vol.13 (1), p.31-46
Main Authors: Taylor, Scott, Hofer, Julie, Murfet, Ian
Format: Article
Language:English
Subjects:
Alleles
Arabidopsis Proteins - genetics
Base Sequence
Carpels
DNA, Complementary
Flowers
Genes, Homeobox
Genes, Plant
inflorescence
Inflorescences
Leaves
Molecular Sequence Data
Mutation
Peas
Petals
Phenotypes
Pisum sativum
Pisum sativum - genetics
Pisum sativum - growth & development
Plant Leaves - growth & development
Plants
RNA, Messenger - genetics
Sequence Homology, Amino Acid
Stamens
Stamina pistilloida gene
Stp gene
Transcription Factors - genetics
Uni gene
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Summary:Isolation and characterization of two severe alleles at the Stamina pistilloida (Stp) locus reveals that Stp is involved in a wide range of developmental processes in the garden pea. The most severe allele, stp-4, results in flowers consisting almost entirely of sepals and carpels. Production of ectopic secondary flowers in stp-4 plants suggests that Stp is involved in specifying floral meristem identity in pea. The stp mutations also reduce the complexity of the compound pea leaf, and primary inflorescences often terminate prematurely in an aberrant sepaloid flower. In addition, stp mutants were shorter than their wild-type siblings due to a reduction in cell number in their internodes. Fewer cells were also found in the epidermis of the leaf rachis of stp mutants. Examination of the effects of stp-4 in double mutant combinations with af, tl, det, and veg2-2-mutations known to influence leaf, inflorescence, and flower development in pea-suggests that Stp function is independent of these genes. A synergistic interaction between weak mutant alleles at Stp and Uni indicated that these two genes act together, possibly to regulate primordial growth. Molecular analysis revealed that Stp is the pea homolog of the Antirrhinum gene Fimbriata (Fim) and of UNUSUAL FLORAL ORGANS (UFO) from Arabidopsis. Differences between Fim/UFO and Stp mutant phenotypes and expression patterns suggest that expansion of Stp activity into the leaf was an important step during evolution of the compound leaf in the garden pea.
ISSN:1040-4651
1532-298X
DOI:10.1105/tpc.13.1.31