SPECIAL ISSUE: Plant Cell Biology
CELL SCIENTISTS TO WATCH
CELL SCIENCE AT A GLANCE
Summary: A discussion of the unique navigating system for pollen tubes achieved by the male–female crosstalk that is required for the successful sexual reproduction of plants.
Emerging role of the plant ERF transcription factors in coordinating wound defense responses and repair
Summary: Subfamily X of EREB-DREB transcription factors are thought to act on either stress signaling or regeneration processes. We suggest that they co-activate both processes, thereby simultaneously protecting injured sites and initiating healing.
Summary: Studying sorting nexins (SNXs) has revealed unique aspects of plant endomembrane trafficking. In this Review, we present the current knowledge, and unclarified functions and perspectives on SNX-mediated plant protein recycling.
Summary: Plant peroxisomes are nodes at the crossroads of different metabolic pathways (nitro-oxidative metabolism, lipid mobilization and photorespiration) which also house relevant molecules (H2O2, NO, NADPH, Ca2+ and lipid-derived signals).
Summary: The transition from algae to land plants included the transition from housing a single to multiple plastids per cell. We review why this might be so and how this monoplastidic bottleneck might have been overcome.
Summary: Although cytokinesis commonly spans the shortest cell axis, plant development requires divisions across the longest cell axis, which can be up to 1 mm long. This Review addresses the mechanics of this process.
Summary: Here, we review the emerging common theme of cell surface receptor-mediated signaling in Arabidopsis, and discuss how the convergent modules regulate divergent signaling outputs while maintaining specificity.
The plant i-AAA protease controls the turnover of an essential mitochondrial protein import component
Summary: We identify the first endogenous substrate of plant i-AAA protease FTSH4. FTSH4 regulates levels of the essential protein import component Tim17-2 and thus mediates preprotein influx into mitochondria.
Summary: In Arabidopsis cotyledon cells, γ-tubulin ring complexes slowed down the microtubule depolymerization rates at the plus-ends, and promoted microtubule rescue events at the lattice.
Summary: Inhibitor assays reveal unique aspects of plant persistent synergid and endosperm cell fusion such as its independence from filamentous actin support and the importance of CDK-mediated mitotic control.
Calmodulin antagonist affects peroxisomal functionality by disrupting both peroxisomal Ca2+ and protein import
Editor's choice: Ca2+ is indispensable for the physiological functioning of peroxisomes in roots and leaves because its absence negatively affects the activity of key enzymes as well as the nitric oxide generation.
Summary: The spatiotemporal relationship between pavement cell chloroplasts and other organelles, and the differential stromule responses of pavement and mesophyll chloroplasts in Arabidopsis are presented.
Replication of ribosomal DNA in Arabidopsis occurs both inside and outside the nucleolus during S phase progression
Summary: In Arabidopsis, replication of active and inactive rDNA occurs during S phase progression. High-resolution data reveal the culmination of replication in the mid S phase in the nucleolus.
Signal motif-dependent ER export of the Qc-SNARE BET12 interacts with MEMB12 and affects PR1 trafficking in Arabidopsis
Summary: Efficient targeting of the Qc-SNARE BET12 is dependent on two distinct signal motifs. BET12 interacts with the Qb-SNARE MEMB12 and regulates trafficking of pathogenesis-related protein 1 in the early secretory pathway in Arabidopsis.
Deletion analysis of AGD1 reveals domains crucial for plasma membrane recruitment and function in root hair polarity
Summary: The spatiotemporal recruitment of AGD1, a plant ACAP-type ARF-GAP, to specific root hair plasma membrane domains is essential for maintaining symmetric tip growth in root hair cells.
PATELLINS are regulators of auxin-mediated PIN1 relocation and plant development in Arabidopsis thaliana
Summary: PATELLINs are plasma membrane-localized proteins required for auxin-induced PIN1 relocalization and multiple developmental processes, including root meristem size development and embryogenesis.
Summary: The Elongator complex has a role in promoting hypocotyl elongation in darkness and upon light signaling during photomorphogenesis via the regulation of a growth-controlling gene network involving histone acetylation.
Arabidopsis thaliana ACS8 plays a crucial role in the early biosynthesis of ethylene elicited by Cu2+ ions
Summary: Cu2+ ions activate expression of the Arabidopsis thaliana ACS8 gene to promote ethylene biosynthesis and elicit a defense response that is dependent on the CuRE regulatory element.
Localisation and substrate specificities of transglycanases in charophyte algae relate to development and morphology
Summary: The distribution of major hemicelluloses and cell wall-modifying enzymes in three charophyte green algae (CGA), representing the ancestors of land plants, relate to algal morphology and developmental stage.
The Golgi entry core compartment functions as a COPII-independent scaffold for ER-to-Golgi transport in plant cells
Summary: The core compartment with cis-most Golgi proteins receives other Golgi components from the ER during Golgi regeneration after removal of brefeldin A, and is formed independently of the COPII machinery.
Loss of Arabidopsis p24 function affects ERD2 trafficking and Golgi structure, and activates the unfolded protein response
Summary: p24 δ-1 subclass proteins play a role in COPI-dependent Golgi-to-ER transport of the K/HDEL receptor ERD2 as well as in the structure of the Golgi in Arabidopsis.
Summary: Quiescent cell division at the stem cell niche is activated by exogenous brassinosteroid signals and points to the brassinosteroid hormone as a limiting factor for stem cell division.