Differential spatial distribution of miR165/6 determines variability in plant root anatomy

Ruocco, G. Di; Bertolotti, Gaia; Pacifici, Elena; Polverari, Laura; Tsiantis, Miltos; Sabatini, Sabrina; Costantino, Paolo; Ioio, Raffaele Dello

doi:10.1242/dev.153858

Cited by 25 publications

(38 citation statements)

References 54 publications

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“…However, since CO2pro: NLS-YFP expression was dramatically decreased in hda19 and we were unable to ascertain the status of JKDpro:JKD-CFP because it was silenced after crossing, we cannot be sure at this time. Several other factors, including SCR, SHR, the BIRDs, and miR165/6, are known to contribute to ground tissue patterning through complex transcriptional regulation, proteinprotein interactions, and protein movement (Cui and Benfey, 2009b;Koizumi et al, 2012;Wu and Gallagher, 2014;Long et al, 2015;Di Ruocco et al, 2018). Thus, the precise role of HDA19 in this network is a subject of future analysis.…”

Section: Discussionmentioning

confidence: 99%

Histone Deacetylase HDA19 Affects Root Cortical Cell Fate by Interacting with SCARECROW

Chen

Drapek

et al. 2019

Plant Physiol.

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The Arabidopsis (Arabidopsis thaliana) root epidermis is a simple model for investigating cell fate specification and pattern formation. In addition to regulatory networks consisting of transcription factors, histone deacetylases are also involved in the formation of cellular patterns. Here, we report thatHistone Deacetylase19 (HDA19) affects the root epidermal cellular pattern through regulation of cortical cell fate by interacting with SCARECROW (SCR). HDA19 binds to the DNA sequence upstream of SCR, as well as to those of several of SCR's target genes, and regulates their expression. Mutant lines of several SCR target genes show impaired patterns of epidermal differentiation and cortical cell division, similar to that of hda19. This work presents HDA19 and SCR as two further players in the regulation of cortical and epidermal cell specification and describes an additional function for SCR.

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Section: Discussionmentioning

confidence: 99%

Histone Deacetylase HDA19 Affects Root Cortical Cell Fate by Interacting with SCARECROW

Chen

Drapek

et al. 2019

Plant Physiol.

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“…Accurate analysis of Cardamine root GT patterning demonstrated that Cardamine show two cortical layers (an outer and an inner one) originating from a developmental domain of mix cortex and endodermis identity (CEM) absent in Arabidopsis. In this species, the CEI firstly divides asymmetrically giving rise to a cortex layer and a CEM that subsequently divides periclinally originating the endodermis and an inner cortex (figure 2b) [43]. The Cardamine inner and outer cortical layers are patterned by stereotypical division happening during embryogenesis.…”

Section: (D) Mechanisms Of Cortex Proliferation In Species With Multimentioning

confidence: 98%

Section: (D) Mechanisms Of Cortex Proliferation In Species With Multimentioning

confidence: 99%

“…Cardamine additional cortex formation [43]. Intriguingly, in Cardamine, miR165/6 activity is low in the CEM, generating a broader expression domain of PHB that is therefore expressed in this tissue [43]. As in Arabidopsis PHB directs CYCD6;1 expression, it is tempting to speculate that PHB directs formative divisions enriching Cardamine GT anatomy via cell cycle regulation.…”

Section: (D) Mechanisms Of Cortex Proliferation In Species With Multimentioning

confidence: 99%

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Building the differences: a case for the ground tissue patterning in plants

2018

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A key question in biology is to understand how interspecies morphological diversities originate. Plant roots present a huge interspecific phenotypical variability, mostly because roots largely contribute to adaptation to different kinds of soils. One example is the interspecific cortex layer number variability, spanning from one to several. Here, we review the latest advances in the understanding of the mechanisms expanding and/or restricting cortical layer number in Arabidopsis thaliana and their involvement in cortex pattern variability among multi-cortical layered species such as Cardamine hirsuta or Oryza sativa .

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“…The expanded PHB activity domain results in the formation of a cortex/endodermis mixed (CEM) cell. Here, PHB activates CYCD6;1 resulting in a division, and thereby the formation of an additional cortex cell layer ( Di Ruocco et al, 2018 ). Orange highlights indicate differences in expression domains compared to Arabidopsis.…”

Section: The Stele Ensures It Is Surrounded By a Single Guarding Endomentioning

confidence: 99%

Getting to the Roots: A Developmental Genetic View of Root Anatomy and Function From Arabidopsis to Lycophytes

Augstein

Carlsbecker

2018

Front. Plant Sci.

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Roots attach plants to the ground and ensure efficient and selective uptake of water and nutrients. These functions are facilitated by the morphological and anatomical structures of the root, formed by the activity of the root apical meristem (RAM) and consecutive patterning and differentiation of specific tissues with distinct functions. Despite the importance of this plant organ, its evolutionary history is not clear, but fossils suggest that roots evolved at least twice, in the lycophyte (clubmosses and their allies) and in the euphyllophyte (ferns and seed plants) lineages. Both lycophyte and euphyllophyte roots grow indeterminately by the action of an apical meristem, which is protected by a root cap. They produce root hairs, and in most species the vascular stele is guarded by a specialized endodermal cell layer. Hence, most of these traits must have evolved independently in these lineages. This raises the question if the development of these apparently analogous tissues is regulated by distinct or homologous genes, independently recruited from a common ancestor of lycophytes and euphyllophytes. Currently, there are few studies of the genetic and molecular regulation of lycophyte and fern roots. Therefore, in this review, we focus on key regulatory networks that operate in root development in the model angiosperm Arabidopsis. We describe current knowledge of the mechanisms governing RAM maintenance as well as patterning and differentiation of tissues, such as the endodermis and the vasculature, and compare with other species. We discuss the importance of comparative analyses of anatomy and morphology of extant and extinct species, along with analyses of gene regulatory networks and, ultimately, gene function in plants holding key phylogenetic positions to test hypotheses of root evolution.

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Differential spatial distribution of miR165/6 determines variability in plant root anatomy

Cited by 25 publications

References 54 publications

Histone Deacetylase HDA19 Affects Root Cortical Cell Fate by Interacting with SCARECROW

Histone Deacetylase HDA19 Affects Root Cortical Cell Fate by Interacting with SCARECROW

Building the differences: a case for the ground tissue patterning in plants

Getting to the Roots: A Developmental Genetic View of Root Anatomy and Function From Arabidopsis to Lycophytes

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