Plant Cellの日

mir172が花成をコントロールしている。developmentと記憶にかかわる部分がおおいな。少量の発現量を厳密にコントロールできるのか？

The GIGANTEA-Regulated MicroRNA172 Mediates Photoperiodic Flowering Independent of CONSTANS in Arabidopsis
Jae-Hoon Jung, Yeon-Hee Seo, Pil Joon Seo, Jose Luis Reyes, Ju Yun, Nam-Hai Chua, and Chung-Mo Park
Plant Cell 2007 19: 2736-2748. First Published on September 21, 2007; 10.1105/tpc.107.054528
CONSTANS plays a central role in photoperiodic flowering. This work defines an additional flowering genetic pathway that regulates flowering initiation in response to daylength changes, in which microRNA172 promotes photoperiodic flowering independent of CONSTANS.

N-Myristoylation Regulates the SnRK1 Pathway in Arabidopsis
Michèle Pierre, José A. Traverso, Bertrand Boisson, Séverine Domenichini, David Bouchez, Carmela Giglione, and Thierry Meinnel
Plant Cell 2007 19: 2804-2821. First Published on September 7, 2007; 10.1105/tpc.107.051870
N-myristoylation is a lipid modification ensuring the proper function and intracellular trafficking of proteins involved in signaling pathways. Comprehensive investigation of protein N-myristoylation in Arabidopsis shows that this function is critical for shoot apical meristem development and that the heterotrimeric SNF1-related kinase SnRK1 is a crucial primary target.

The MYB46 Transcription Factor Is a Direct Target of SND1 and Regulates Secondary Wall Biosynthesis in Arabidopsis
Ruiqin Zhong, Elizabeth A. Richardson, and Zheng-Hua Ye
Plant Cell 2007 19: 2776-2792. First Published on September 21, 2007; 10.1105/tpc.107.053678
Biosynthesis of secondary walls requires the coordinated expression of secondary wall biosynthetic genes. This article presents the discovery of a MYB transcription factor, MYB46, as a direct target of SND1 and demonstrates that MYB46 is another key regulator in activating the biosynthetic pathways for cellulose, xylan, and lignin.

NCURVATA2 Encodes the Catalytic Subunit of DNA Polymerase {alpha} and Interacts with Genes Involved in Chromatin-Mediated Cellular Memory in Arabidopsis thaliana
José María Barrero, Rebeca González-Bayón, Juan Carlos del Pozo, María Rosa Ponce, and José Luis Micol
Plant Cell 2007 19: 2822-2838. First Published on September 14, 2007; 10.1105/tpc.107.054130
Genetic analyses show that INCURVATA2 interacts with chromatin-remodeling genes TERMINAL FLOWER2 and CURLY LEAF, suggesting genetic and molecular interactions between chromatin remodeling factors and components of the DNA replication machinery.

A Cluster of Disease Resistance Genes in Arabidopsis Is Coordinately Regulated by Transcriptional Activation and RNA Silencing
Hankuil Yi and Eric J. Richards
Plant Cell 2007 19: 2929-2939. First Published on September 21, 2007; 10.1105/tpc.107.051821
In the flowering plant Arabidopsis, genes encoding pathogen defense proteins are often clustered in the genome. This study shows that the genes in one cluster are coordinately regulated by a positive feed-forward transcriptional signaling loop and negative regulation via RNA silencing. Plant pathogens that suppress RNA silencing might trigger expression of these defense genes.

The Arabidopsis E3 SUMO Ligase SIZ1 Regulates Plant Growth and Drought Responses
Rafael Catala, Jian Ouyang, Isabel A. Abreu, Yuxin Hu, Haksoo Seo, Xiuren Zhang, and Nam-Hai Chua
Plant Cell 2007 19: 2952-2966. First Published on September 28, 2007; 10.1105/tpc.106.049981
Arabidopsis siz1 mutants are smaller in stature and have lower tolerance to drought stress than the wild type. Gene expression analysis shows that SIZ1 mediates the expression of 300 drought-inducible genes independently of DREB2A and ABA. The authors conclude that the SIZ1 SUMO E3 ligase plays a role in the regulation of gene expression that influences plant growth and the drought stress response