scholarly journals Nitrate induction of root hair density is mediated by TGA1/TGA4 and CPC transcription factors in Arabidopsis thaliana

2017 ◽  
Vol 92 (2) ◽  
pp. 305-316 ◽  
Author(s):  
Javier Canales ◽  
Orlando Contreras-López ◽  
José M. Álvarez ◽  
Rodrigo A. Gutiérrez
Keyword(s):  
Arabidopsis Thaliana ◽  
Transcription Factors ◽  
Root Hair ◽  
Hair Density ◽  
Nitrate Induction ◽  
Root Hair Density

scholarly journals Positional Signaling and Expression of ENHANCER OF TRY AND CPC1 Are Tuned to Increase Root Hair Density in Response to Phosphate Deficiency in Arabidopsis thaliana

PLoS ONE ◽  
2013 ◽  
Vol 8 (10) ◽  
pp. e75452 ◽  
Author(s):  
Natasha Savage ◽  
Thomas J. W. Yang ◽  
Chung Ying Chen ◽  
Kai-Lan Lin ◽  
Nicholas A. M. Monk ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Root Hair ◽  
Phosphate Deficiency ◽  
Hair Density ◽  
Root Hair Density

scholarly journals Regulation of root hair density by phosphorus availability in Arabidopsis thaliana

2001 ◽  
Vol 24 (4) ◽  
pp. 459-467 ◽  
Author(s):  
Z. Ma ◽  
D. G. Bielenberg ◽  
K. M. Brown ◽  
J. P. Lynch
Keyword(s):  
Arabidopsis Thaliana ◽  
Root Hair ◽  
Phosphorus Availability ◽  
Hair Density ◽  
Root Hair Density

scholarly journals Increased root hair density by loss of WRKY6 in Arabidopsis thaliana

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e2891 ◽  
Author(s):  
Markus G. Stetter ◽  
Martin Benz ◽  
Uwe Ludewig
Keyword(s):  
Arabidopsis Thaliana ◽  
Root Hair ◽  
Cortical Cell ◽  
Chromosome 1 ◽  
Cell Diameter ◽  
Nucleotide Polymorphisms ◽  
Loss Of Function ◽  
Hair Density ◽  
Cortical Cells ◽  
Root Hair Density

Root hairs are unicellular elongations of certain rhizodermal cells that improve the uptake of sparingly soluble and immobile soil nutrients. Among different Arabidopsis thaliana genotypes, root hair density, length and the local acclimation to low inorganic phosphate (Pi) differs considerably, when analyzed on split agar plates. Here, genome-wide association fine mapping identified significant single nucleotide polymorphisms associated with the increased root hair density in the absence of local phosphate on chromosome 1. A loss-of-functionmutant of the candidate transcription factor gene WRKY6, which is involved in the acclimation of plants to low phosphorus, had increased root hair density. This is partially explained by a reduced cortical cell diameter in wrky6-3, reducing the rhizodermal cell numbers adjacent to the cortical cells. As a consequence, rhizodermal cells in positions that are in contact with two cortical cells are found more often, leading to higher hair density. Distinct cortical cell diameters and epidermal cell lengths distinguish other Arabidopsis accessions with distinct root hair density and −Pi response from diploid Col-0, while tetraploid Col-0 had generally larger root cell sizes, which explain longer hairs. A distinct radial root morphology within Arabidopsis accessions and wrky6-3explains some, but not all, differences in the root hair acclimation to –Pi.

scholarly journals Increased root hair density by loss of WRKY6 in Arabidopsis thaliana

2016 ◽  
Author(s):  
Markus G Stetter ◽  
Martin Benz ◽  
Uwe Ludewig
Keyword(s):  
Arabidopsis Thaliana ◽  
Root Hair ◽  
Cortical Cell ◽  
Chromosome 1 ◽  
Cell Diameter ◽  
Nucleotide Polymorphisms ◽  
Loss Of Function ◽  
Hair Density ◽  
Cortical Cells ◽  
Root Hair Density

Root hairs are unicellular elongations of certain rhizodermal cells that improve the uptake of sparingly soluble and immobile soil nutrients. Among different Arabidopsis thaliana genotypes, root hair density, length and the local acclimation to low inorganic phosphate (Pi) differs considerably, when analyzed on split agar plates. Here, genome-wide association fine mapping identified significant single nucleotide polymorphisms associated with the increased root hair density in the absence of local phosphate on chromosome 1. A loss-of-function mutant of the candidate transcription factor gene WRKY6, which is involved in the acclimation of plants to low phosphorus, had increased root hair density. This is partially explained by a reduced cortical cell diameter in wrky6-3, reducing the rhizodermal cell numbers adjacent to the cortical cells. As a consequence, rhizodermal cells in positions that are in contact with two cortical cells are found more often, leading to higher hair density. Distinct cortical cell diameters and epidermal cell lengths distinguish other Arabidopsis accessions with distinct root hair density and -Pi response from diploid Col-0, while tetraploid Col-0 had generally larger root cell sizes, which explain longer hairs. A distinct radial root morphology within Arabidopsis accessions and wrky6-3 explains some, but not all, differences in the root hair acclimation to –Pi.

scholarly journals Increased root hair density by loss of WRKY6 in Arabidopsis thaliana

2016 ◽  
Author(s):  
Markus G Stetter ◽  
Martin Benz ◽  
Uwe Ludewig
Keyword(s):  
Arabidopsis Thaliana ◽  
Root Hair ◽  
Cortical Cell ◽  
Chromosome 1 ◽  
Cell Diameter ◽  
Nucleotide Polymorphisms ◽  
Loss Of Function ◽  
Hair Density ◽  
Cortical Cells ◽  
Root Hair Density

Root hairs are unicellular elongations of certain rhizodermal cells that improve the uptake of sparingly soluble and immobile soil nutrients. Among different Arabidopsis thaliana genotypes, root hair density, length and the local acclimation to low inorganic phosphate (Pi) differs considerably, when analyzed on split agar plates. Here, genome-wide association fine mapping identified significant single nucleotide polymorphisms associated with the increased root hair density in the absence of local phosphate on chromosome 1. A loss-of-function mutant of the candidate transcription factor gene WRKY6, which is involved in the acclimation of plants to low phosphorus, had increased root hair density. This is partially explained by a reduced cortical cell diameter in wrky6-3, reducing the rhizodermal cell numbers adjacent to the cortical cells. As a consequence, rhizodermal cells in positions that are in contact with two cortical cells are found more often, leading to higher hair density. Distinct cortical cell diameters and epidermal cell lengths distinguish other Arabidopsis accessions with distinct root hair density and -Pi response from diploid Col-0, while tetraploid Col-0 had generally larger root cell sizes, which explain longer hairs. A distinct radial root morphology within Arabidopsis accessions and wrky6-3 explains some, but not all, differences in the root hair acclimation to –Pi.

scholarly journals Susceptibility to the Sugar Beet Cyst Nematode Is Modulated by Ethylene Signal Transduction in Arabidopsis thaliana

2001 ◽  
Vol 14 (10) ◽  
pp. 1206-1212 ◽  
Author(s):  
Martin J. E. Wubben ◽  
Hong Su ◽  
Steven R. Rodermel ◽  
Thomas J. Baum
Keyword(s):  
Signal Transduction ◽  
Arabidopsis Thaliana ◽  
Root Hair ◽  
Cyst Nematode ◽  
Hair Density ◽  
Ethylene Response ◽  
Root Hair Density ◽  
Ethylene Signal Transduction ◽  
Sugar Beet Cyst Nematode ◽  
Ethylene Signal

Previously, we identified Arabidopsis thaliana mutant rhd1-4 as hypersusceptible to the sugar beet cyst nematode Heterodera schachtii. We assessed rhd1-4 as well as two other rhd1 alleles and found that each exhibited, in addition to H. schachtii hypersusceptibility, decreased root length, increased root hair length and density, and deformation of the root epidermal cells compared with wild-type A. thaliana ecotype Columbia (Col-0). Treatment of rhd1-4 and Col-0 with the ethylene inhibitors 2-aminoeth-oxyvinylglycine and silver nitrate and the ethylene precursor 1-aminocyclopropane-1-carboxylic acid suggests that the rhd1-4 hypersusceptibility and root morphology phenotypes are the result of an increased ethylene response. Assessment of known ethylene mutants further support the finding that ethylene plays a role in mediating A. thaliana susceptibility to H. schachtii because mutants that overproduce ethylene (eto1-1, eto2, and eto3) are hypersusceptible to H. schachtii and mutants that are ethylene-insensitive (etr1-1, ein2-1, ein3-1, eir1-1, and axr2) are less susceptible to H. schachtii. Because the ethylene mutants tested show altered susceptibility and altered root hair density and length, a discrimination between the effects of altered ethylene signal transduction and root hair density on susceptibility was accomplished by analyzing the ttg and gl2 mutants, which produce ectopic root hairs that result in greatly increased root hair densities while maintaining normal ethylene signal transduction. The observed normal susceptibilities to H. schachtii of ttg and gl2 indicate that increased root hair density, per se, does not cause hypersusceptibility. Furthermore, the results of nematode attraction assays suggest that the hypersusceptibility of rhd1-4 and the ethylene-overproducing mutant eto3 may be the result of increased attraction of H. schachtii-infective juveniles to root exudates of these plants. Our findings indicate that rhd1 is altered in its ethylene response and that ethylene signal transduction positively influences plant susceptibility to cyst nematodes.

scholarly journals Rock Fragment Content in Soils Shift Root Foraging Behavior in Xerophytic Species

2021 ◽  
Author(s):  
Hui Hu ◽  
Weikai Bao ◽  
David M. Eissenstat ◽  
Long Huang ◽  
Fanglan Li
Keyword(s):  
Root Hair ◽  
Fine Root ◽  
Root Hairs ◽  
Root Traits ◽  
Rock Fragment ◽  
Hair Density ◽  
Root Branching ◽  
Root Hair Density ◽  
Branching Intensity ◽  
Rock Fragment Content

Abstract Aims Root traits associated with resource foraging, including fine-root branching intensity, root hair and mycorrhiza, may change in soils with various physical structure indicated by rock fragment content (RFC), while how these traits covariate at the level of individual root branching order is largely unknown.Methods We subjected two xerophytic species, Artemisia vestita (subshrub) and Bauhinia brachycarpa (shrub), to increasing RFC gradients (0%, 25%, 50% and 75%, v v-1) in an arid environment and measured fine-root traits related to resource foraging.Results Root hair density and mycorrhizal colonization of both species decreased with increasing root order, but increased in 3rd- and 4th-order roots at high RFCs (50% or 75%). The two species tend to produce more root hairs than mycorrhizas under the high RFCs. For both species, root hair density and mycorrhizal colonization intensity were negatively correlated with root length and root diameter. Rockiness reduced root branching intensity in both species comparing with rock-free soil. At the same level of RFC, A. vestita had thicker roots and lower branching intensity than B. brachycarpa, and tended to produce more root hairs.Conclusion Our results suggest the high RFC soil conditions stimulated greater foraging functions in higher root orders. We found evidence for a greater investment in root hairs and mycorrhizal symbioses as opposed to building an extensive root system in rocky soils. The subshrub and shrub species took different approaches to foraging in the rocky soil through distinctive trait syndromes of fine-root components.

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