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Song Y.,Key Laboratory of Arid and Grassland Agroecology | Song Y.,Agriculture and Agri Food Canada | Wu K.,National Taiwan University | Dhaubhadel S.,Agriculture and Agri Food Canada | And 2 more authors.
Biochemical and Biophysical Research Communications | Year: 2010

DNA methyltransferase2 (DNMT2) is always deemed to be enigmatic, because it contains highly conserved DNA methyltransferase motifs but lacks the DNA methylation catalytic capability. Here we show that Arabidopsis DNA methyltransferase2 (AtDNMT2) is localized in nucleus and associates with histone deacetylation. Bimolecular fluorescence complementation and pull-down assays show AtDNMT2 interacts with type-2 histone deacetylases (AtHD2s), a unique type of histone deacetylase family in plants. Through analyzing the expression of AtDNMT2: ß-glucuronidase (GUS) fusion protein, we demonstrate that AtDNMT2 has the ability to repress gene expression at transcription level. Meanwhile, the expression of AtDNMT2 gene is altered in athd2c mutant plants. We propose that AtDNMT2 possibly involves in the activity of histone deacetylation and plant epigenetic regulatory network. Crown Copyright © 2010.

Ma Z.,Lanzhou University | Ma Z.,Key Laboratory of Arid and Grassland Agroecology | Wang S.,Lanzhou University | Wang W.,Lanzhou University | And 2 more authors.
Comptes Rendus - Biologies | Year: 2011

Abstract: A stage-structured predator-prey system incorporating a class of functional responses is presented in this article. By analyzing the system and using the standard comparison theorem, the sufficient conditions are derived for permanence of the system and non-permanence of predators. © 2011 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.

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