You are here

Home » Regulation of inflorescence architecture by intertissue layer ligand-receptor communication between endodermis and phloem.

Regulation of inflorescence architecture by intertissue layer ligand-receptor communication between endodermis and phloem.

Submitted by Keiko-Torii on

TitleRegulation of inflorescence architecture by intertissue layer ligand-receptor communication between endodermis and phloem.
Publication TypeJournal Article
Year of Publication2012
AuthorsUchida N, Lee J S, Horst RJ, Lai H-H, Kajita R, Kakimoto T, Tasaka M, Torii KU
JournalProceedings of the National Academy of Sciences of the United States of America
Volume109
Issue16
Pagination6337-42
Date Published2012 Apr 17
ISSN1091-6490
KeywordsGene Expression Profiling, Amino Acid Sequence, arabidopsis, Arabidopsis Proteins, Protein Binding, Gene Expression Regulation, Developmental, Gene Expression Regulation, Plant, Glucuronidase, Immunoblotting, Inflorescence, Microscopy, Confocal, Molecular Sequence Data, Mutation, Systems Theory, Phloem, Plants, Genetically Modified, Protein-Serine-Threonine Kinases, Receptors, Cell Surface, Sequence Homology, Amino Acid
Abstract

<p>
Multicellular organisms achieve final body shape and size by coordinating cell proliferation, expansion, and differentiation. Loss of function in the Arabidopsis ERECTA (ER) receptor-kinase gene confers characteristic compact inflorescence architecture, but its underlying signaling pathways remain unknown. Here we report that the expression of ER in the phloem is sufficient to rescue compact er inflorescences. We further identified two Epidermal Patterning Factor-like (EPFL) secreted peptide genes, EPFL4 and EPFL6/CHALLAH (CHAL), as redundant, upstream components of ER-mediated inflorescence growth. The expression of EPFL4 or EPFL6 in the endodermis, a layer adjacent to phloem, is sufficient to rescue the er-like inflorescence of epfl4 epfl6 plants. EPFL4 and EPFL6 physically associate with ER in planta. Finally, transcriptome analysis of er and epfl4 epfl6 revealed a potential downstream component as well as a role for plant hormones in EPFL4/6- and ER-mediated inflorescence growth. Our results suggest that intercell layer communication between the endodermis and phloem mediated by peptide ligands and a receptor kinase coordinates proper inflorescence architecture in Arabidopsis.</p>
Alternate JournalProc. Natl. Acad. Sci. U.S.A.