Recently added articles from Plant Cell:
Conservation and Redundancy of Serine Acetyltransferases
Sep 01, 2008; ... In the final stages of inorganic sulfur assimilation, plants fix sulfur into Cys, the major intermediate for the formation of sulfurcontaining compounds in the cell (reviewed in Saito, 2004). Two enzymes catalyze the last steps of Cys formation, Ser acetyltransferase (SERAT) and OAS (thiol) ...
Basal Defense in Arabidopsis: WRKYs Interact with Histone Deacetylase HDA19
Sep 01, 2008; ... Plants face a diverse array of pathogen attack strategies in the wild, and regulation of the defense response often is a matter of life or death. WRKY transcription factors regulate the expression of many defense genes (reviewed in Eulgem and Somssich, 2007); in Arabidopsis, activation of ...
A Bioinformatics Approach to Investigating Leaf Development
Sep 01, 2008; ... The question of how leaf form is established has long intrigued plant biologists and has important ramifications in both natural and agricultural systems. Heterochrony refers to developmental changes in the timing of events that lead to changes in the size and/or shape of an organ. Heterochronic ...
Coordination of Chloroplast Envelope Division
Sep 01, 2008; ... Chloroplasts arose from cyanobacteria and, like cyanobacteria, divide by binary fission. These organelles are surrounded by a double membrane, and their division requires the coordinated action of the inner and outer chloroplast membrane constriction machineries (Miyagishima, 2005; Maple and ...
Cyclotides: Cyclical Miniproteins with a Cystine Knot Configuration
Sep 01, 2008; ... Proteins that operate in challenging environments must be stable to both harsh conditions and vigorous proteolysis. Cystine knot miniproteins are found in diverse phyla and are characterized by three conserved disulfide bonds that stabilize their structure. Some of these miniproteins have ...
RNase-Based Self-Incompatibility: Puzzled by Pollen S(W)
Sep 01, 2008; ... Many plants have a genetically determined self-incompatibility system in which the rejection of self pollen grains is controlled by alleles of an S locus. A common feature of these S loci is that separate pollen- and style-expressed genes (pollen S and style S, respectively) determine S allele ...
A Protracted and Dynamic Maturation Schedule Underlies Arabidopsis Leaf Development(W)
Sep 01, 2008; ... Leaf development has beenmonitored chiefly by following anatomical markers. Analysis of transcriptome dynamics during leaf maturation revealedmultiple expression patterns that rise or fall with age or that display age-specific peaks. Thesewere used to formulate a digital differentiation index ...
Biochemical Characterization of Arabidopsis Complexes Containing CONSTITUTIVELY PHOTOMORPHOGENIC1 and SUPPRESSOR OF PHYA Proteins in Light Control of Plant Development(W)
Sep 01, 2008; ... COP1 (for CONSTITUTIVELY PHOTOMORPHOGENIC1) and the four partially redundant SPA (for SUPPRESSOR OF PHYA) proteins work in concert to repress photomorphogenesis in Arabidopsis thaliana by targeting key transcription factors and phytochrome A for degradation via the 26S proteasome. Here, we ...
LZF1/SALT TOLERANCE HOMOLOG3, an Arabidopsis B-Box Protein Involved in Light-Dependent Development and Gene Expression, Undergoes COP1-Mediated Ubiquitination(W)
Sep 01, 2008; ... B-box containing proteins play an important role in light signaling in plants. Here, we identify LIGHT-REGULATED ZINC FINGER1/SALT TOLERANCE HOMOLOG3 (STH3), a B-box encoding gene that genetically interacts with two key regulators of light signaling, ELONGATED HYPOCOTYL5 (HY5) and CONSTITUTIVE ...
Chloroplast Signaling and LESION SIMULATING DISEASE1 Regulate Crosstalk between Light Acclimation and Immunity in Arabidopsis(W)
Sep 01, 2008; ... Plants are simultaneously exposed to abiotic and biotic hazards. Here, we show that local and systemic acclimation in Arabidopsis thaliana leaves in response to excess excitation energy (EEE) is associated with cell death and is regulated by specific redox changes of the plastoquinone (PQ) pool ....
Arabidopsis WRKY38 and WRKY62 Transcription Factors Interact with Histone Deacetylase 19 in Basal Defense(W)
Sep 01, 2008; ... Arabidopsis thaliana WRKY38 and WRKY62, encoding two structurally similar type III WRKY transcription factors, are induced in a Nonexpressor of PR Gene1 (NPR1)-dependent manner by salicylic acid (SA) or by virulent Pseudomonas syringae. Disease resistance and SA-regulated Pathogenesis-Related1 ...
Sexual and Apomictic Seed Formation in Hieracium Requires the Plant Polycomb-Group Gene FERTILIZATION INDEPENDENT ENDOSPERM(W)
Sep 01, 2008; ... A Polycomb-Group (PcG) complex, FERTILIZATION INDEPENDENT SEED (FIS), represses endosperm development in Arabidopsis thaliana until fertilization occurs. The Hieracium genus contains apomictic species that form viable seeds asexually. To investigate FIS function during apomictic seed formation, ...
MATERNALLY EXPRESSED PAB C-TERMINAL, a Novel Imprinted Gene in Arabidopsis, Encodes the Conserved C-Terminal Domain of Polyadenylate Binding Proteins(W)
Sep 01, 2008; ... Parental imprinting is important for seed development, but few imprinted genes have been identified in plants. The four known imprinted genes in Arabidopsis thaliana encode transcriptional regulators. Here, we describe a novel imprinted gene, MATERNALLY EXPRESSED PAB C-TERMINAL (MPC), which ...
Genetic Analysis Reveals That C^sub 19^-GA 2-Oxidation Is a Major Gibberellin Inactivation Pathway in Arabidopsis(W)
Sep 01, 2008; ... Bioactive hormone concentrations are regulated both at the level of hormone synthesis and through controlled inactivation. Based on the ubiquitous presence of 2β-hydroxylated gibberellins (GAs), a major inactivating pathway for the plant hormone GA seems to be via GA 2-oxidation. In this ...
A Gender-Specific Retinoblastoma-Related Protein in Volvox carteri Implies a Role for the Retinoblastoma Protein Family in Sexual Development(W)(OA)
Sep 01, 2008; ... Here, we describe the cloning and characterization of RETINOBLASTOMA-RELATED PROTEIN1 (RBR1) from the green alga Volvox carteri. RBR1 expression increases substantially during embryogenesis and in response to the sex-inducer glycoprotein, but it decreases significantly under heat stress. While ...
Release of the Repressive Activity of Rice DELLA Protein SLR1 by Gibberellin Does Not Require SLR1 Degradation in the gid2 Mutant(W)
Sep 01, 2008; ... The rice (Oryza sativa) DELLA protein SLR1 acts as a repressor of gibberellin (GA) signaling. GA perception by GID1 causes SLR1 protein degradation involving the F-box protein GID2; this triggers GA-associated responses such as shoot elongation and seed germination. In GA-insensitive and GA ...
Distribution and Evolution of Circular Miniproteins in Flowering Plants(W)
Sep 01, 2008; ... Cyclotides are disulfide-rich miniproteins with the unique structural features of a circular backbone and knotted arrangement of three conserved disulfide bonds. Cyclotides have been found only in two plant families: in every analyzed species of the violet family (Violaceae) and in few species ...
Comparative Genomics and Reverse Genetics Analysis Reveal Indispensable Functions of the Serine Acetyltransferase Gene Family in Arabidopsis(W)(OA)
Sep 01, 2008; ... Ser acetyltransferase (SERAT), which catalyzes O-acetyl-Ser (OAS) formation, plays a key role in sulfur assimilation and Cys synthesis. Despite several studies on SERATs from various plant species, the in vivo function of multiple SERAT genes in plant cells remains unaddressed. Comparative ...
Proteolysis-Independent Downregulation of DELLA Repression in Arabidopsis by the Gibberellin Receptor GIBBERELLIN INSENSITIVE DWARF1(W)
Sep 01, 2008; ... This article presents evidence that DELLA repression of gibberellin (GA) signaling is relieved both by proteolysis-dependent and -independent pathways in Arabidopsis thaliana. DELLA proteins are negative regulators of GA responses, including seed germination, stem elongation, and fertility. GA ...
Arabidopsis ARC6 Coordinates the Division Machineries of the Inner and Outer Chloroplast Membranes through Interaction with PDV2 in the Intermembrane Space(W)
Sep 01, 2008; ... Chloroplasts arose from a free-living cyanobacterial endosymbiont and divide by binary fission. Division involves the assembly and constriction of the endosymbiont-derived, tubulin-like FtsZ ring on the stromal surface of the inner envelope membrane and the host-derived, dynamin-like ARC5 ring ...