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Reactive oxygen species produced by NADPH oxidase regulate plant cell growth
It is shown here that RHD2 is an NADPH oxidase, a protein that transfers electrons from NADPH to an electron acceptor leading to the formation of reactive oxygen species (ROS) and that ROS accumulate in growing wild-type (WT) root hairs but their levels are markedly decreased in rhd2 mutants. Expand
Cellular organisation of the Arabidopsis thaliana root.
The anatomy of the developing root of Arabidopsis is described using conventional histological techniques, scanning and transmission electron microscopy and a model of meristem activity is proposed, which underpins future work on the developmental genetics of root morphogenesis. Expand
A basic helix-loop-helix transcription factor controls cell growth and size in root hairs
The discovery of a basic helix-loop-helix (bHLH) transcription factor called RSL4 that is sufficient to promote postmitotic cell growth in Arabidopsis thaliana root-hair cells is reported. Expand
Origin and Diversification of Basic-Helix-Loop-Helix Proteins in Plants
  • N. Pires, L. Dolan
  • Biology, Medicine
  • Molecular biology and evolution
  • 25 November 2009
Much of the diversity of plant bHLH proteins was established in early land plants, over 440 million years ago, according to whole-genome sequences from nine species of land plants and algae. Expand
Local Positive Feedback Regulation Determines Cell Shape in Root Hair Cells
This work found that Ca2+, in turn, activated the RHD2 NADPH oxidase to produce ROS at the growing point in the root hair. Expand
A RhoGDP dissociation inhibitor spatially regulates growth in root hair cells
It is proposed that the spatial organization of growth in plant cells requires the local RhoGDI-regulated activation of the RHD2/AtrbohC NADPH oxidase, which is required for hair growth. Expand
Ethylene is a positive regulator of root hair development in Arabidopsis thaliana.
A model is proposed in which either ethylene or ACC is a signal involved in specifying the pattern of cell differentiation in the Arabidopsis root epidermis. Expand
An Ancient Mechanism Controls the Development of Cells with a Rooting Function in Land Plants
The phylogeny of land plants supports the hypothesis that early land plants were bryophyte-like and possessed a dominant gametophyte and later the sporophyte rose to dominance, and the data suggest that the increase in morphological complexity of the sporphyte body in the Paleozoic resulted at least in part from the recruitment of regulatory genes from gamete to sporophytes. Expand
Clonal relationships and cell patterning in the root epidermis of Arabidopsis
Ectopic hairs are present in the ctr1 root epidermis suggesting that a Raf protein kinase may play a role in pattern formation/differentiation in theroot epider Mis and that ethylene may be a diffusible signal involved in specifying pattern in the root epidersmis. Expand
A distant coilin homologue is required for the formation of cajal bodies in Arabidopsis.
It is shown that At1g13030 is required for Cajal body formation in Arabidopsis, and it is hypothesize that the level of its expression is correlated with Cjal body size, suggesting that other genes can also affect CBs. Expand