scholarly journals Nitrate Induction of Primary Root Growth Requires Cytokinin Signaling in Arabidopsis thaliana

2019 ◽  
Vol 61 (2) ◽  
pp. 342-352 ◽  
Author(s):  
Pamela A Naulin ◽  
Grace I Armijo ◽  
Andrea S Vega ◽  
Karem P Tamayo ◽  
Diana E Gras ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Cell Division ◽  
Root Growth ◽  
Primary Root ◽  
Growth Arrest ◽  
Root Tip ◽  
Wild Type ◽  
Cytokinin Signaling ◽  
Control Growth ◽  
Primary Root Growth

Abstract Nitrate can act as a potent signal to control growth and development in plants. In this study, we show that nitrate is able to stimulate primary root growth via increased meristem activity and cytokinin signaling. Cytokinin perception and biosynthesis mutants displayed shorter roots as compared with wild-type plants when grown with nitrate as the only nitrogen source. Histological analysis of the root tip revealed decreased cell division and elongation in the cytokinin receptor double mutant ahk2/ahk4 as compared with wild-type plants under a sufficient nitrate regime. Interestingly, a nitrate-dependent root growth arrest was observed between days 5 and 6 after sowing. Wild-type plants were able to recover from this growth arrest, while cytokinin signaling or biosynthesis mutants were not. Transcriptome analysis revealed significant changes in gene expression after, but not before, this transition in contrasting genotypes and nitrate regimes. We identified genes involved in both cell division and elongation as potentially important for primary root growth in response to nitrate. Our results provide evidence linking nitrate and cytokinin signaling for the control of primary root growth in Arabidopsis thaliana.

Apical meristem exhaustion during determinate primary root growth in the moots koom 1 mutant of Arabidopsis thaliana

Planta ◽  
2011 ◽  
Vol 234 (6) ◽  
pp. 1163-1177 ◽  
Author(s):  
Alejandra Hernández-Barrera ◽  
Yamel Ugartechea-Chirino ◽  
Svetlana Shishkova ◽  
Selene Napsucialy-Mendivil ◽  
Aleš Soukup ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Root Growth ◽  
Apical Meristem ◽  
Primary Root ◽  
Primary Root Growth

scholarly journals Exogenous Nitro-Oleic Acid Treatment Inhibits Primary Root Growth by Reducing the Mitosis in the Meristem in Arabidopsis thaliana

2020 ◽  
Vol 11 ◽  
Author(s):  
Luciano M. Di Fino ◽  
Ignacio Cerrudo ◽  
Sonia R. Salvatore ◽  
Francisco J. Schopfer ◽  
Carlos García-Mata ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Oleic Acid ◽  
Root Growth ◽  
Acid Treatment ◽  
Primary Root ◽  
Primary Root Growth

Hydrogen peroxide plays an important role in PERK4-mediated abscisic acid-regulated root growth in Arabidopsis

2019 ◽  
Vol 46 (2) ◽  
pp. 165 ◽  
Author(s):  
Xiaonan Ma ◽  
Xiaoran Zhang ◽  
Ling Yang ◽  
Mengmeng Tang ◽  
Kai Wang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Abscisic Acid ◽  
Root Growth ◽  
Primary Root ◽  
Root Tip ◽  
Exogenous Aba ◽  
Ros Accumulation ◽  
Primary Root Growth ◽  
Respiratory Burst Oxidase ◽  
Respiratory Burst Oxidase Homologue

Abscisic acid (ABA) is a crucial factor that affects primary root tip growth in plants. Previous research suggests that reactive oxygen species (ROS), especially hydrogen peroxide, are important regulators of ABA signalling in root growth of Arabidopsis. PROLINE-RICH EXTENSIN-LIKE RECEPTOR KINASE 4 (PERK4) plays an important role in ABA responses. Arabidopsis perk4 mutants display attenuated sensitivity to ABA, especially in primary root growth. To gain insights into the mechanism(s) of PERK4-associated ABA inhibition of root growth, in this study we investigated the involvement of ROS in this process. Normal ROS accumulation in the primary root in response to exogenous ABA treatment was not observed in perk4 mutants. PERK4 deficiency prohibits ABA-induced expression of RESPIRATORY BURST OXIDASE HOMOLOGUE (RBOH) genes, therefore the perk4-1 mutant showed decreased production of ROS in the root. The perk4-1/rbohc double mutant displayed the same phenotype as the perk4 and rbohc single mutants in response to exogenous ABA treatment. The results suggest that PERK4-stimulated ROS accumulation during ABA-regulated primary root growth may be mediated by RBOHC.

Ethylene mediates dichromate-induced inhibition of primary root growth by altering AUX1 expression and auxin accumulation in Arabidopsis thaliana

2018 ◽  
Vol 41 (6) ◽  
pp. 1453-1467 ◽  
Author(s):  
Abdul Wakeel ◽  
Imran Ali ◽  
Sakila Upreti ◽  
Azizullah Azizullah ◽  
Bohan Liu ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Root Growth ◽  
Primary Root ◽  
Primary Root Growth ◽  
Auxin Accumulation

scholarly journals Arabidopsis thaliana GH3.9 influences primary root growth

Planta ◽  
2007 ◽  
Vol 226 (1) ◽  
pp. 21-34 ◽  
Author(s):  
Sadaf Khan ◽  
Julie M. Stone
Keyword(s):  
Arabidopsis Thaliana ◽  
Root Growth ◽  
Primary Root ◽  
Primary Root Growth

TPST is involved in fructose regulation of primary root growth in Arabidopsis thaliana

2020 ◽  
Vol 103 (4-5) ◽  
pp. 511-525
Author(s):  
Yingli Zhong ◽  
Jiyong Xie ◽  
Suzhen Wen ◽  
Wenwu Wu ◽  
Li Tan ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Root Growth ◽  
Primary Root ◽  
Primary Root Growth

Nitrate inhibits primary root growth by reducing accumulation of reactive oxygen species in the root tip in Medicago truncatula

2020 ◽  
Vol 146 ◽  
pp. 363-373 ◽  
Author(s):  
Lili Zang ◽  
Marie-Christine Morère-Le Paven ◽  
Thibault Clochard ◽  
Alexis Porcher ◽  
Pascale Satour ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Root Growth ◽  
Medicago Truncatula ◽  
Primary Root ◽  
Reactive Oxygen ◽  
Root Tip ◽  
Oxygen Species ◽  
Primary Root Growth

scholarly journals Bacillus megaterium Rhizobacteria Promote Growth and Alter Root-System Architecture Through an Auxin- and Ethylene-Independent Signaling Mechanism in Arabidopsis thaliana

2007 ◽  
Vol 20 (2) ◽  
pp. 207-217 ◽  
Author(s):  
José López-Bucio ◽  
Juan Carlos Campos-Cuevas ◽  
Erasto Hernández-Calderón ◽  
Crisanto Velásquez-Becerra ◽  
Rodolfo Farías-Rodríguez ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Root Growth ◽  
Root Hair ◽  
Lateral Root ◽  
Root Formation ◽  
Growth Promotion ◽  
Primary Root ◽  
Root System Architecture ◽  
Ethylene Signaling ◽  
Primary Root Growth

Soil microorganisms are critical players in plant-soil interactions at the rhizosphere. We have identified a Bacillus megaterium strain that promoted growth and development of bean (Phaseolus vulgaris) and Arabidopsis thaliana plants. We used Arabidopsis thaliana as a model to characterize the effects of inoculation with B. megaterium on plant-growth promotion and postembryonic root development. B. megaterium inoculation caused an inhibition in primary-root growth followed by an increase in lateral-root number, lateral-root growth, and root-hair length. Detailed cellular analyses revealed that primary root-growth inhibition was caused both by a reduction in cell elongation and by reduction of cell proliferation in the root meristem. To study the contribution of auxin and ethylene signaling pathways in the alterations in root-system architecture elicited by B. megaterium, a suite of plant hormone mutants of Arabidopsis, including aux1-7, axr4-1, eir1, etr1, ein2, and rhd6, defective in either auxin or ethylene signaling, were evaluated for their responses to inoculation with this bacteria. When inoculated, all mutant lines tested showed increased biomass production. Moreover, aux1-7 and eir1, which sustain limited root-hair and lateral-root formation when grown in uninoculated medium, were found to increase the number of lateral roots and to develop long root hairs when inoculated with B. megaterium. The ethylene-signaling mutants etr1 and ein2 showed an induction in lateral-root formation and root-hair growth in response to bacterial inoculation. Taken together, our results suggest that plant-growth promotion and root-architectural alterations by B. megaterium may involve auxin- and-ethylene independent mechanisms.

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