Root elongation and branching is related to local hexose concentration in <i>Arabidopsis thaliana</i> seedlings

Freixes, Sandra; Thibaud, Marie-Christine; Tardieu, Francois F.; Muller, Bertrand

doi:10.1046/j.1365-3040.2002.00912.x

Cited by 144 publications

(137 citation statements)

References 28 publications

(54 reference statements)

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“…However, LR number was not initially stimulated in response to low P in the experiments of Al Ghazi et al (2003). This may indicate that external conditions such as light affect the way of RSA reacts to P starvation, possibly through changes in the carbon status of the root, which has been found crucial for LR growth (Freixes et al, 2002). Our results also delineate contrasting effects of P starvation on LR development with a strong inhibition of primordia initiation combined with a marked stimulation of their activation (Fig.…”

Section: P Starvation Mimics the Effect Of Auxin On The Root Phenotypmentioning

confidence: 50%

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A Role for Auxin Redistribution in the Responses of the Root System Architecture to Phosphate Starvation in Arabidopsis

et al. 2005

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The changes in root system architecture (RSA) triggered by phosphate (P) deprivation were studied in Arabidopsis (Arabidopsis thaliana) plants grown for 14 d on 1 mM or 3 mM P. Two different temporal phases were observed in the response of RSA to low P. First, lateral root (LR) development was promoted between days 7 and 11 after germination, but, after day 11, all root growth parameters were negatively affected, leading to a general reduction of primary root (PR) and LR lengths and of LR density. Low P availability had contrasting effects on various stages of LR development, with a marked inhibition of primordia initiation but a strong stimulation of activation of the initiated primordia. The involvement of auxin signaling in these morphological changes was investigated in wild-type plants treated with indole-3-acetic acid or 2,3,5-triiodobenzoic acid and in axr4-1, aux1-7, and eir1-1 mutants. Most effects of low P on RSA were dramatically modified in the mutants or hormonetreated wild-type plants. This shows that auxin plays a major role in the P starvation-induced changes of root development. From these data, we hypothesize that several aspects of the RSA response to low P are triggered by local modifications of auxin concentration. A model is proposed that postulates that P starvation results in (1) an overaccumulation of auxin in the apex of the PR and in young LRs, (2) an overaccumulation of auxin or a change in sensitivity to auxin in the lateral primordia, and (3) a decrease in auxin concentration in the lateral primordia initiation zone of the PR and in old laterals. Measurements of local changes in auxin concentrations induced by low P, either by direct quantification or by biosensor expression pattern (DR5:: b-glucuronidase reporter gene), are in line with these hypotheses. Furthermore, the observation that low P availability mimicked the action of auxin in promoting LR development in the alf3 mutant confirmed that P starvation stimulates primordia emergence through increased accumulation of auxin or change in sensitivity to auxin in the primordia. Both the strong effect of 2,3,5-triiodobenzoic acid and the phenotype of the auxin-transport mutants (aux1, eir1) suggest that low P availability modifies local auxin concentrations within the root system through changes in auxin transport rather than auxin synthesis.Changes in mineral nutrient availability and heterogeneous distribution in the soil induce in plants various adaptive mechanisms, among which the plasticity of root development is of crucial importance (Drew, 1975;Lynch, 1995;Thaler and Pages, 1998;Farley and Fitter, 1999;Hell and Hillebrand, 2001). In several species, root proliferation in nutrient-rich regions leads to an increased ratio of root surface to explored soil volume, which facilitates the uptake of nutrients (Drew, 1975;Robinson, 1994). However, the root system architecture (RSA) does not respond the same way to all nutrients (Drew, 1975;Farley and Fitter, 1999). For instance, nitrate availability does not affect the elongation of ...

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Section: P Starvation Mimics the Effect Of Auxin On The Root Phenotypmentioning

confidence: 50%

“…Root growth parameters were determined after analysis of scanned images using the Optimas image analysis software (MediaCybernetics, Silver Spring, MD) as described by Freixes et al (2002). Only LRs longer than 1 mm were considered.…”

Section: Morphological Analysismentioning

confidence: 99%

A Role for Auxin Redistribution in the Responses of the Root System Architecture to Phosphate Starvation in Arabidopsis

et al. 2005

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“…Light levels have been used in the past to modulate endogenous sugar levels in Arabidopsis (Freixes et al, 2002;Kircher and Schopfer, 2012). To test this hypothesis, we first checked if light could also modulate LR production similar to that of Glc.…”

Section: Relevance For Glc-induced Lr Production Under Natural Enviromentioning

confidence: 99%

Interaction between Glucose and Brassinosteroid during the Regulation of Lateral Root Development in Arabidopsis

2015

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“…This can include increasing lateral root growth in the presence of nitrogen or directing the growth of roots toward sources of water (Roycewicz and Malamy, 2012). This can even include altering the root growth pattern in the presence of nutrients not typically considered to be sourced from the rhizosphere, such as carbohydrates (Freixes et al, 2002). While these responses lead to altered partitioning of growth between the root and shoot, the specific mechanisms beyond a nutrient imbalance are not well understood nor is it clear how many rhizosphere stimuli trigger foliar responses.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Variation in Responses to Root Spatial Constraint within Arabidopsis thaliana

2015

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ORCID IDs: 0000-0001-9298-629X (B.J.); 0000-0001-5759-3175 (D.J.K.)Among the myriad of environmental stimuli that plants utilize to regulate growth and development to optimize fitness are signals obtained from various sources in the rhizosphere that give an indication of the nutrient status and volume of media available. These signals include chemical signals from other plants, nutrient signals, and thigmotropic interactions that reveal the presence of obstacles to growth. Little is known about the genetics underlying the response of plants to physical constraints present within the rhizosphere. In this study, we show that there is natural variation among Arabidopsis thaliana accessions in their growth response to physical rhizosphere constraints and competition. We mapped growth quantitative trait loci that regulate a positive response of foliar growth to short physical constraints surrounding the root. This is a highly polygenic trait and, using quantitative validation studies, we showed that natural variation in EARLY FLOWERING3 (ELF3) controls the link between root constraint and altered shoot growth. This provides an entry point to study how root and shoot growth are integrated to respond to environmental stimuli.

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Root elongation and branching is related to local hexose concentration in Arabidopsis thaliana seedlings

Cited by 144 publications

References 28 publications

A Role for Auxin Redistribution in the Responses of the Root System Architecture to Phosphate Starvation in Arabidopsis

A Role for Auxin Redistribution in the Responses of the Root System Architecture to Phosphate Starvation in Arabidopsis

Interaction between Glucose and Brassinosteroid during the Regulation of Lateral Root Development in Arabidopsis

Quantitative Variation in Responses to Root Spatial Constraint within Arabidopsis thaliana

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