Original Article


, Volume 230, Issue 6, pp 1207-1221

First online:

The histone acetyltransferase GCN5 affects the inflorescence meristem and stamen development in Arabidopsis

  • Ross CohenAffiliated withBiology Department, Muhlenberg College
  • , John SchockenAffiliated withBiology Department, Muhlenberg College
  • , Athanasios KaldisAffiliated withDepartment of Botany, School of Biology, Aristotle University of Thessaloniki
  • , Konstantinos E. VlachonasiosAffiliated withDepartment of Botany, School of Biology, Aristotle University of Thessaloniki
  • , Amy T. HarkAffiliated withBiology Department, Muhlenberg College
  • , Elizabeth R. McCainAffiliated withBiology Department, Muhlenberg College Email author 

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access


A central question in biology is to understand how gene expression is precisely regulated to give rise to a variety of forms during the process of development. Epigenetic effects such as DNA methylation or histone modification have been increasingly shown to play a critical role in regulation of genome function. GCN5 is a prototypical histone acetyltransferase that participates in regulating developmental gene expression in several metazoan species. In Arabidopsis thaliana, plants with T-DNA insertions in GCN5 (also known as HAG1) display a variety of pleiotropic effects including dwarfism, loss of apical dominance, and floral defects affecting fertility. We sought to determine when during early development floral abnormalities first arise. Using scanning electron microscopy, we demonstrate that gcn5-1/hag1-1 and gcn5-5/hag1-5 mutants display overproliferation of young buds and development of abnormal structures around the inflorescence meristem. gcn5 mutants also display defects in stamen number and arrangement at later stages. This analysis provides temporal and spatial information to aid in the identification of GCN5 target genes in the developing flower. Preliminary studies of putative targets using reverse transcriptase PCR suggest that the floral meristem identity gene LEAFY is among factors upregulated in gcn5-1 mutants.


Flower development Arabidopsis thaliana Chromatin modification Histone acetyltransferase GCN5