Control of phyllotaxy by the cytokinin-inducible response regulator homologue ABPHYL1

Giulini, A., Wang, J., Jackson, D. P. (August 2004) Control of phyllotaxy by the cytokinin-inducible response regulator homologue ABPHYL1. Nature, 430 (7003). pp. 1031-4. ISSN 1476-4687 (Electronic)

URL: http://www.ncbi.nlm.nih.gov/pubmed/15329722
DOI: 10.1038/nature02778

Abstract

Phyllotaxy describes the geometric pattern of leaves and flowers, and has intrigued botanists and mathematicians for centuries. How these patterns are initiated is poorly understood, and this is partly due to the paucity of mutants. Signalling by the plant hormone auxin appears to determine the site of leaf initiation; however, this observation does not explain how distinct patterns of phyllotaxy are initiated. abphyl1 (abph1) mutants of maize initiate leaves in a decussate pattern (that is, paired at 180 degrees), in contrast to the alternating or distichous phyllotaxy observed in wild-type maize and other grasses. Here we show that ABPH1 is homologous to two-component response regulators and is induced by the plant hormone cytokinin. ABPH1 is expressed in the embryonic shoot apical meristem, and its spatial expression pattern changes rapidly with cytokinin treatment. We propose that ABPH1 controls phyllotactic patterning by negatively regulating the cytokinin-induced expansion of the shoot meristem, thereby limiting the space available for primordium initiation at the apex.

Item Type: Paper
Uncontrolled Keywords: Alleles Amino Acid Sequence Base Sequence Body Patterning drug effects Cytokinins pharmacology Gene Expression Regulation Plant drug effects Meristem anatomy & histology drug effects growth & development metabolism Molecular Sequence Data Mutation genetics Phenotype Plant Proteins biosynthesis chemistry genetics metabolism Plant Shoots anatomy & histology drug effects growth & development metabolism RNA Messenger genetics metabolism Zea mays drug effects genetics growth & development metabolism
Subjects: bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > auxin
organs, tissues, organelles, cell types and functions > tissues types and functions > meristem
organism description > plant behavior > phyllotaxy
CSHL Authors:
Communities: CSHL labs > Jackson lab
Depositing User: CSHL Librarian
Date: 26 August 2004
Date Deposited: 03 Apr 2012 20:47
Last Modified: 04 Mar 2013 14:25
Related URLs:
URI: http://repository.cshl.edu/id/eprint/25905

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