Genetic Control of Root Hair Development in Arabidopsis thaliana.

Schiefelbein, John; Somerville, Chris

doi:10.1105/tpc.2.3.235

Cited by 299 publications

(97 citation statements)

References 12 publications

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“…Rapid cell expansion is associated with vacuole expansion through water uptake (33). Consistently, the tonoplast aquaporin GAMMA TONOPLAST INTRINSIC PROTEIN (GAMMA-TIP) is specifically expressed in the MZ where cells begin rapid elongation (88), and plant cells defective in vacuole expansion do not elongate (130, 134). …”

Section: Developmental Zones Of the Rootmentioning

confidence: 95%

Control of Arabidopsis Root Development

Petricka

Winter

Benfey

2012

Annu. Rev. Plant Biol.

571

480

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The Arabidopsis root has been the subject of intense research over the past decades. This research has led to significantly improved understanding of the molecular mechanisms underlying root development. Key insights into the specification of individual cell types, cell patterning, growth and differentiation, branching of the primary root, and responses of the root to the environment have been achieved. Transcription factors and plant hormones play key regulatory roles. Recently, mechanisms involving protein movement and the oscillation of gene expression have also been uncovered. Root gene regulatory networks controlling root development have been reconstructed from genome-wide profiling experiments, revealing novel molecular connections and models. Future refinement of these models will lead to a more complete description of the complex molecular interactions that give rise to a simple growing root.

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Section: Developmental Zones Of the Rootmentioning

confidence: 95%

Control of Arabidopsis Root Development

Petricka

Winter

Benfey

2012

Annu. Rev. Plant Biol.

571

480

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“…1990) and the double auxin mutant ( aux1-7 , axr4-2 ) (CS8040) has far fewer lateral roots than either of the parental lines (Hobbie & Estelle 1995). Rhd1-1 (CS2257) has root hairs similar in length and distribution to Col, though bulbous in shape (Schiefelbein & Somerville 1990). The two leaf architecture mutants used were phy-b and gl1-1 : phy-b (CS6217) is a phytochrome B photoreceptor mutant that has elongated petioles, stems and root hairs (Reed et al .…”

Section:  mentioning

confidence: 99%

Differential genetic influences on competitive effect and response in Arabidopsis thaliana

2005

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Summary 1Competition plays an important role in structuring populations and communities, but our understanding of the genetic basis of competitive ability is poor. This is further complicated by the fact that plants can express both competitive effect (target plant influence upon neighbour growth) and competitive response (target plant growth as a function of a neighbour) abilities, with these ecological characteristics potentially being independent. 2 Using the model plant species Arabidopsis thaliana , we investigated patterns of intraspecific variation in competitive effect and response abilities and their relationships to other plant traits and resource supply rates. 3 Both competitive effect and response were measured for 11 genotypes, including the Columbia ecotype and 10 derived mutant genotypes. Plants were grown alone, with intragenotypic competition, and with intergenotypic competition in a replicated blocked design with high nutrient and low nutrient soil nutrient treatments. We quantified competitive effect and response on absolute and per-gram bases. 4 Competitive effect and response varied among genotypes, with the relative competitive abilities of genotypes consistent across fertilization treatments. Overall, high rates of fertilization increased competitive effect and competitive response abilities of all genotypes. Both competitive effect and response were correlated with neighbour biomass, though genotype-specific traits also influenced competitive response. 5 At the genotype level, there was no correlation between competitive effect and response in either fertilization treatment. Overall patterns in competitive response appeared consistent among inter-and intragenotypic competition treatments, indicating that a target genotype's response to competition was not driven by the genetic identity of the competitor. 6 These findings indicate that within A. thaliana , there is the potential for differential selection on competitive effect and response abilities, and that such selection may influence different sets of plant traits. The concept of a single competitive ability for a given plant is not supported by these data, and we suggest continued recognition of these dual competitive abilities is essential to understanding the potential role of competition in influencing intra-and interspecific processes.

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“…In Arabidopsis ( Arabidopsis thaliana ), root anatomy is well determined, and the different steps of root hair development including fate determination, initiation, bulge formation, and tip growth have been defined (Schiefelbein and Somerville, 1990; Dolan et al, 1993; Galway et al, 1994). By definition, epidermal cells located over the anticlinal junction between two underlying cortical cells differentiate into trichoblast cells that develop root hairs, while epidermal cells that lie above the outer periclinal cortical cells become non-hair cell atrichoblasts (Masucci et al, 1996; Dolan, 2006).…”

Section: Introductionmentioning

confidence: 99%

The Density and Length of Root Hairs Are Enhanced in Response to Cadmium and Arsenic by Modulating Gene Expressions Involved in Fate Determination and Morphogenesis of Root Hairs in Arabidopsis

Bahmani

Kim

et al. 2016

Front. Plant Sci.

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Root hairs are tubular outgrowths that originate from epidermal cells. Exposure of Arabidopsis to cadmium (Cd) and arsenic [arsenite, As(III)] increases root hair density and length. To examine the underlying mechanism, we measured the expression of genes involved in fate determination and morphogenesis of root hairs. Cd and As(III) downregulated TTG1 and GL2 (negative regulators of fate determination) and upregulated GEM (positive regulator), suggesting that root hair fate determination is stimulated by Cd and As(III). Cd and As(III) increased the transcript levels of genes involved in root hair initiation (RHD6 and AXR2) and root hair elongation (AUX1, AXR1, ETR1, and EIN2) except CTR1. DR5::GUS transgenic Arabidopsis showed a higher DR5 expression in the root tip, suggesting that Cd and As(III) increased the auxin content in the root tip. Knockdown of TTG1 in Arabidopsis resulted in increased root hair density and decreased root hair length compared with the control (Col-0) on 1/2 MS media. This phenotype may be attributed to the downregulation of GL2 and CTR1 and upregulation of RHD6. By contrast, gem mutant plants displayed a decrease in root hair density and length with reduced expression of RHD6, AXR2, AUX1, AXR1, ETR1, CTR1, and EIN2. Taken together, our results indicate that fate determination, initiation, and elongation of root hairs are stimulated in response to Cd and As(III) through the modulation of the expression of genes involved in these processes in Arabidopsis.

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Genetic Control of Root Hair Development in Arabidopsis thaliana.

Cited by 299 publications

References 12 publications

Control of Arabidopsis Root Development

Control of Arabidopsis Root Development

Differential genetic influences on competitive effect and response in Arabidopsis thaliana

The Density and Length of Root Hairs Are Enhanced in Response to Cadmium and Arsenic by Modulating Gene Expressions Involved in Fate Determination and Morphogenesis of Root Hairs in Arabidopsis

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