scholarly journals Signalling Overlaps between Nitrate and Auxin in Regulation of The Root System Architecture: Insights from the Arabidopsis thaliana

2020 ◽  
Vol 21 (8) ◽  
pp. 2880
Author(s):  
Muhammad Asim ◽  
Zia Ullah ◽  
Aluko Oluwaseun ◽  
Qian Wang ◽  
Haobao Liu
Keyword(s):  
Arabidopsis Thaliana ◽  
Transcription Factors ◽  
Root System ◽  
System Architecture ◽  
Lateral Roots ◽  
Root System Architecture ◽  
Auxin Biosynthesis ◽  
Regulatory Module ◽  
Model Plant Arabidopsis Thaliana ◽  
Nitrate Supply

Nitrate (NO3–) and auxin are key regulators of root growth and development, modulating the signalling cascades in auxin-induced lateral root formation. Auxin biosynthesis, transport, and transduction are significantly altered by nitrate. A decrease in nitrate (NO3–) supply tends to promote auxin translocation from shoots to roots and vice-versa. This nitrate mediated auxin biosynthesis regulating lateral roots growth is induced by the nitrate transporters and its downstream transcription factors. Most nitrate responsive genes (short-term and long-term) are involved in signalling overlap between nitrate and auxin, thereby inducing lateral roots initiation, emergence, and development. Moreover, in the auxin signalling pathway, the varying nitrate supply regulates lateral roots development by modulating the auxin accumulation in the roots. Here, we focus on the roles of nitrate responsive genes in mediating auxin biosynthesis in Arabidopsis root, and the mechanism involved in the transport of auxin at different nitrate levels. In addition, this review also provides an insight into the significance of nitrate responsive regulatory module and their downstream transcription factors in root system architecture in the model plant Arabidopsis thaliana.

Natural genetic variation of Arabidopsis thaliana root morphological response to magnesium supply

2015 ◽  
Vol 66 (12) ◽  
pp. 1249 ◽  
Author(s):  
Qiying Xiao ◽  
Hugues De Gernier ◽  
László Kupcsik ◽  
Jérôme De Pessemier ◽  
Klaus Dittert ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Root System ◽  
Root Morphology ◽  
System Architecture ◽  
Lateral Roots ◽  
Iron Concentration ◽  
Primary Root ◽  
Root System Architecture ◽  
Mineral Nutrient ◽  
Nutrient Distribution

Plants dynamically cope with the variability of mineral nutrient distribution in soil by constantly modulating nutrient uptake and shaping root-system architecture. The changes in root morphology in response to major essential elements are largely documented, but little is known about how the root system responds to magnesium (Mg) availability. Thirty-six natural accessions of the model species Arabidopsis thaliana were subjected to an in vitro screen for identifying variation in root system architecture in response to Mg availability. Response of root morphology was observed on 2-dimensional agar plates. Low Mg supply repressed the elongation of the lateral roots more than of the primary root. However, some accessions exhibited higher number and length of lateral roots than the reference Columbia-0. Across all accessions, the root morphological traits did not correlate with tissue Mg concentrations. Interestingly, shoot calcium and root phosphorus concentrations were positively correlated with the number and length of lateral roots, whereas root iron concentration was negatively correlated with the primary root length. The diversity of root phenotypes identified in this report is a useful resource to study the genetic component determining root morphology in response to Mg availability.

scholarly journals AT-HOOK MOTIF NUCLEAR LOCALISED PROTEIN 18 as a Novel Modulator of Root System Architecture

2020 ◽  
Author(s):  
Marek Šírl ◽  
Tereza Šnajdrová ◽  
Dolores Gutiérrez-Alanís ◽  
Joseph G. Dubrovsky ◽  
Jean Phillipe Vielle-Calzada ◽  
...  
Keyword(s):  
Root System ◽  
System Architecture ◽  
Lateral Root ◽  
Apical Meristem ◽  
Lateral Roots ◽  
Primary Root ◽  
Root System Architecture ◽  
Root Apical Meristem ◽  
Root Initiation ◽  
Lateral Root Initiation

The AT-HOOK MOTIF NUCLEAR LOCALIZED PROTEIN (AHL) gene family encodes embryophyte-specific nuclear proteins with DNA binding activity. They modulate gene expression and affect various developmental processes in plants. We identify AHL18 (At3G60870) as a developmental modulator of root system architecture and growth. AHL18 regulates the length of the proliferation domain and number of dividing cells in the root apical meristem and thereby, cell production. Both primary root growth and lateral root development respond according to AHL18 transcription level. The ahl18 knock-out plants show reduced root systems due to a shorter primary root and a lower number of lateral roots. This change results from a higher number of arrested and non-developing lateral root primordia (LRP) rather than from decreased initiation. Overexpression of AHL18 results in a more extensive root system, longer primary roots, and increased density of lateral root initiation events. Formation of lateral roots is affected during the initiation of LRP and later development. AHL18 regulate root apical meristem activity, lateral root initiation and emergence, which is in accord with localization of its expression.

Chromate alters root system architecture and activates expression of genes involved in iron homeostasis and signaling in Arabidopsis thaliana

2014 ◽  
Vol 86 (1-2) ◽  
pp. 35-50 ◽  
Author(s):  
Miguel Martínez-Trujillo ◽  
Alfonso Méndez-Bravo ◽  
Randy Ortiz-Castro ◽  
Fátima Hernández-Madrigal ◽  
Enrique Ibarra-Laclette ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Root System ◽  
System Architecture ◽  
Iron Homeostasis ◽  
Root System Architecture ◽  
Expression Of Genes

scholarly journals Plasticity of the Root System Architecture and Leaf Gas Exchange Parameters Are Important for Maintaining Bottle Gourd Responses under Water Deficit

Plants ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1697
Author(s):  
Dinoclaudio Zacarias Rafael ◽  
Osvin Arriagada ◽  
Guillermo Toro ◽  
Jacob Mashilo ◽  
Freddy Mora-Poblete ◽  
...  
Keyword(s):  
Root System ◽  
Water Deficit ◽  
System Architecture ◽  
Root Length ◽  
Leaf Gas Exchange ◽  
Lateral Roots ◽  
Physiological Responses ◽  
Root System Architecture ◽  
Second Order ◽  
Bottle Gourd

The evaluation of root system architecture (RSA) development and the physiological responses of crop plants grown under water-limited conditions are of great importance. The purpose of this study was to examine the short-term variation of the morphological and physiological plasticity of Lagenaria siceraria genotypes under water deficit, evaluating the changes in the relationship between the root system architecture and leaf physiological responses. Bottle gourd genotypes were grown in rhizoboxes under well-watered and water deficit conditions. Significant genotype-water regime interactions were observed for several RSA traits and physiological parameters. Biplot analyses confirmed that the drought-tolerant genotypes (BG-48 and GC) showed a high net CO2 assimilation rate, stomatal conductance, transpiration rates with a smaller length, and a reduced root length density of second-order lateral roots, whereas the genotypes BG-67 and Osorno were identified as drought-sensitive and showed greater values for average root length and the density of second-order lateral roots. Consequently, a reduced length and density of lateral roots in bottle gourd should constitute a response to water deficit. The root traits studied here can be used to evaluate bottle gourd performance under novel water management strategies and as criteria for breeding selection.

Effects of dichromate on growth and root system architecture of Arabidopsis thaliana seedlings

Plant Science ◽  
2007 ◽  
Vol 172 (4) ◽  
pp. 684-691 ◽  
Author(s):  
Randy Ortiz Castro ◽  
Miguel Martínez Trujillo ◽  
José López Bucio ◽  
Carlos Cervantes ◽  
Joseph Dubrovsky
Keyword(s):  
Arabidopsis Thaliana ◽  
Root System ◽  
System Architecture ◽  
Root System Architecture
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