Plant Physiology Preview
Published on August 21, 2003; 10.1104/pp.103.025403
Received April 17, 2003
Returned for revision May 27, 2003
Accepted June 26, 2003
Expression Profile and Cellular Localization of Maize Rpd3-Type Histone Deacetylases during Plant Development
Serena Varotto , Sabrina Locatelli , Sabrina Canova , Alexandra Pipal , Mario Motto , and Vincenzo Rossi *
Dipartimento di Agronomia Ambientale e Produzioni Vegetali-Università di Padova, viale dell'Università 16, I-35020 Legnaro, Padova, Italy (S.V., S.C.); Istituto sperimentale per la Cerealicoltura-Sezione di Bergamo, via Stezzano 24, I-24126 Bergamo, Italy (S.L., M.M., V.R.); and Department of Molecular Biology, University of Innsbruck, Medical School, A-6020 Innsbruck, Austria (A.P.)
* Corresponding author; email: rossi{at}iscbg.it.
We analyzed the expression profile and cellular localization of the maize (Zea mays) Rpd3-type histone deacetylases genes ZmRpd3/101, ZmRpd3/102, and ZmRpd3/108 (indicated as ZmHDA101, ZmHDA102, and ZmHDA108 in the Plant Chromatin Database). This study shows that maize Rpd3 transcripts are present in all the organs and cellular domains analyzed, but we found that their amounts change during development, accumulating in the inner region of the endosperm, in vascular zones of the nucellus, in the tapetum, and in the tetrads. A similar expression profile and nucleus-cytoplasmic localization was observed for ZmRpd3 proteins. Glutathione S-transferase pull-down assays show that ZmRpd3 proteins can interact with the maize retinoblastoma-related (ZmRBR1) protein, an important regulator of cell cycle progression, and with the maize retinoblastoma-associated protein (ZmRbAp1). However, the three ZmRpd3 proteins do not mutually compete in the binding. These results suggest a general role of ZmRpd3 genes in the plant cell cycle and development. These observations also provide indications on possible mechanisms regulating their transcription and protein accumulation. Similarities in the gene expression profiles and protein interactions may indicate that functional redundancy among members of the ZmRpd3 gene family exists. However, a degree of functional divergence is also supported by our findings.
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