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A key question in developmental biology is how cells exchange positional information for proper patterning during organ development. In plant roots the radial tissue organization is highly conserved with a central vascular cylinder in which two water conducting cell types, protoxylem and metaxylem, are patterned centripetally. We show that this patterning(More)
Plant cells are connected through plasmodesmata (PD), membrane-lined channels that allow symplastic movement of molecules between cells. However, little is known about the role of PD-mediated signaling during plant morphogenesis. Here, we describe an Arabidopsis gene, CALS3/GSL12. Gain-of-function mutations in CALS3 result in increased accumulation of(More)
Photoassimilates such as sugars are transported through phloem sieve element cells in plants. Adapted for effective transport, sieve elements develop as enucleated living cells. We used electron microscope imaging and three-dimensional reconstruction to follow sieve element morphogenesis in Arabidopsis. We show that sieve element differentiation involves(More)
Cytokinin phytohormones regulate a variety of developmental processes in the root such as meristem size, vascular pattern, and root architecture [1-3]. Long-distance transport of cytokinin is supported by the discovery of cytokinins in xylem and phloem sap [4] and by grafting experiments between wild-type and cytokinin biosynthesis mutants [5]. Acropetal(More)
Developmental transitions can be described in terms of morphology and the roles of individual genes, but also in terms of global transcriptional and epigenetic changes. Temporal dissections of transcriptome changes, however, are rare for intact, developing tissues. We used RNA sequencing and microarray platforms to quantify gene expression from labeled(More)
Plant development has a significant postembryonic phase that is guided heavily by interactions between the plant and the outside environment. This interplay is particularly evident in the development, pattern and function of stomata, epidermal pores on the aerial surfaces of land plants. Stomata have been found in fossils dating from more than 400 million(More)
The development and growth of higher plants is highly dependent on the conduction of water and minerals throughout the plant by xylem vessels. In Arabidopsis roots the xylem is organized as an axis of cell files with two distinct cell fates: the central metaxylem and the peripheral protoxylem. During vascular development, high and low expression levels of(More)
(A) Edwards D, Kerp H, Hass H: Stomata in early land plants: an anatomical and ecophysiological approach. J Exp Bot 1998, 49(Suppl 1):255–278, reprinted by permission of Oxford University Press. (B-C) Ligrone R, Duckett JG, Renzaglia KS: Major transitions in the evolution of early land plants: a bryological perspective. Ann Bot 2012, 109:851–871, reprinted(More)
(A) Edwards D, Kerp H, Hass H: Stomata in early land plants: an anatomical and ecophysiological approach. J Exp Bot 1998, 49(Suppl 1):255–278, reprinted by permission of Oxford University Press. (B-C) Ligrone R, Duckett JG, Renzaglia KS: Major transitions in the evolution of early land plants: a bryological perspective. Ann Bot 2012, 109:851–871, reprinted(More)
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