Plant Physiology Preview
Published on June 14, 2002; 10.1104/pp.001677
Received December 26, 2001
Returned for revision January 30, 2002
Accepted April 4, 2002
PROLIFERATING INFLORESCENCE MERISTEM, a MADS-Box Gene
That Regulates Floral Meristem Identity in Pea
Scott A. Taylor , Julie M.I. Hofer *, Ian C. Murfet , John D. Sollinger , Susan R. Singer , Maggie R. Knox , and T. H. Noel Ellis
School of Plant Science, University of Tasmania, G.P.O. Box 252--55, Hobart, Tasmania, 7001, Australia (S.A.T., I.C.M.); John Innes Centre, Colney Lane, Norwich NR4 7UH, United Kingdom (S.A.T., J.M.I.H., M.R.K., T.H.N.E.); and Department of Biology, Carleton College, Northfield, Minnesota 55057 (J.D.S., S.R.S.)
* Corresponding author; email: julie.hofer{at}bbsrc.ac.uk.
SQUAMOSA and APETALA1 are floral meristem identity genes from snapdragon (Antirrhinum majus) and Arabidopsis, respectively. Here, we characterize the floral meristem identity mutation proliferating inflorescence meristem (pim) from pea (Pisum sativum) and show that it corresponds to a defect in the PEAM4 gene, a homolog of SQUAMOSA and APETALA1. The PEAM4 coding region was deleted in the pim-1 allele, and this deletion cosegregated with the pim-1 mutant phenotype. The pim-2 allele carried a nucleotide substitution at a predicted 5' splice site that resulted in mis-splicing of pim-2 mRNA. PCR products corresponding to unspliced and exon-skipped mRNA species were observed. The pim-1 and pim-2 mutations delayed floral meristem specification and altered floral morphology significantly but had no observable effect on vegetative development. These floral-specific mutant phenotypes and the restriction of PIM gene expression to flowers contrast with other known floral meristem genes in pea that additionally affect vegetative development. The identification of PIM provides an opportunity to compare pathways to flowering in species with different inflorescence architectures.
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