title: Symplastic domains in the Arabidopsis shoot apical meristem correlate with PDLP1 expression patterns.
abstract: Symplastic domains in plants are defined by spatial limitations on cell-to-cell communication through plasmodesmata (Pds) and establish tissue boundaries necessary for metabolic and developmental programming. With the exception of the physical closure of Pds by callose, the cues and the processes for creating symplastic domains remain poorly understood. Recently, we identified a novel family of eight proteins, called Pd-located protein 1 (PDLP1). These proteins span the plasma membrane within Pds and likely form part of a signal transduction system that perceives external signals to regulate molecular trafficking between cells. For two members of this family that have high expression in the shoot apex we show that they have defined and partially overlapping tissue-specific expression patterns that correlate in part with previously defined symplastic domains. The importance of non-cell-autonomous proteins in shoot development and of the spatial rules that govern leaf and floral development highlight the need to have a clearer understanding of symplastic domains.
authors.affiliation: John Innes Centre; Norwich Research Park; Colney, Norwich United Kingdom.
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Bayer
authors.forename: Carole
authors.initials: C
authors.lastname: Thomas
authors.forename: Andy
authors.initials: A
authors.lastname: Maule
references.citation: Proc Natl Acad Sci U S A. 2002 Feb 5;99(3):1713-7
references.pmid: 11818578
references.citation: Plant Physiol. 2004 Nov;136(3):3795-803
references.pmid: 15516516
references.citation: Genes Dev. 2005 Apr 1;19(7):788-93
references.pmid: 15805469
references.citation: Development. 2003 Sep;130(18):4351-62
references.pmid: 12900451
references.citation: PLoS Biol. 2008 Jan;6(1):e7
references.pmid: 18215111
references.citation: Curr Opin Plant Biol. 2005 Dec;8(6):593-9
references.pmid: 16207533
references.citation: Development. 1998 Apr;125(8):1477-85
references.pmid: 9502728