Present address: Chromatin and Reproduction Group, Temasek Lifescience Laboratory, 1 Research Link, National University of Singapore, Singapore 117604.
Polycomb group genes control developmental timing of endosperm
Article first published online: 4 APR 2005
The Plant Journal
Volume 42, Issue 5, pages 663–674, June 2005
How to Cite
Ingouff, M., Haseloff, J. and Berger, F. (2005), Polycomb group genes control developmental timing of endosperm. The Plant Journal, 42: 663–674. doi: 10.1111/j.1365-313X.2005.02404.x
- Issue published online: 4 APR 2005
- Article first published online: 4 APR 2005
- Received 23 November 2004; revised 15 February 2005; accepted 22 February 2005.
- Arabidopsis thaliana;
- developmental timing;
- Polycomb group;
Polycomb (PcG) group proteins form modular complexes, which maintain repressed transcriptional states of target genes across cell divisions. As PcG complexes provide a memory of cell fate, such proteins might control temporal aspects of development. Loss-of-function of any of the FERTILIZATION INDEPENDENT SEED (FIS) PcG genes perturbs endosperm development. In this report we provide a detailed analysis of the phenotype of fis endosperm development using molecular and cellular markers. Wild type (WT) endosperm development undergoes a series of four major developmental phases timed by successive synchronous nuclei division. In fis endosperm the transition from phase 1, marked by a synchronous mode of nuclei divisions to phase 2, corresponding to the establishment of three mitotic domains, is absent. Accordingly, the expression of seven markers of phase 1 and phase 2 is temporally perturbed. In spite of such changes, specific sequences of developmental events still take place as in the WT. Overall, fis mutations are heterochronic mutations that cause a temporal deregulation in the ontogenic sequence of endosperm development.