PoplarV1, Main, Exploration, bibRecord, 000D09

Quantitative dissection of variations in root growth rate: a matter of cell proliferation or of cell expansion?

Identifieur interne : 000D09 ( Main/Exploration ); précédent : 000D08; suivant : 000D10

Quantitative dissection of variations in root growth rate: a matter of cell proliferation or of cell expansion?

Auteurs : Chvan Youssef [France] ; François Bizet [France] ; Renaud Bastien [Allemagne] ; David Legland [France] ; Marie-Béatrice Bogeat-Triboulot [France] ; Irène Hummel [France]

Source :

Journal of experimental botany [ 1460-2431 ] ; 2018.

RBID : pubmed:30053124

Descripteurs français

KwdFr :
- Acide abscissique (métabolisme), Chlorure de sodium (métabolisme), Division cellulaire (effets des médicaments et des substances chimiques), Facteur de croissance végétal (métabolisme), Génotype (MeSH), Peroxyde d'hydrogène (métabolisme), Polyéthylène glycols (métabolisme), Populus (croissance et développement), Populus (effets des médicaments et des substances chimiques), Populus (génétique), Prolifération cellulaire (effets des médicaments et des substances chimiques), Racines de plante (croissance et développement), Racines de plante (effets des médicaments et des substances chimiques), Racines de plante (génétique).
MESH :
- croissance et développement : Populus, Racines de plante.
- effets des médicaments et des substances chimiques : Division cellulaire, Populus, Prolifération cellulaire, Racines de plante.
- génétique : Populus, Racines de plante.
- métabolisme : Acide abscissique, Chlorure de sodium, Facteur de croissance végétal, Peroxyde d'hydrogène, Polyéthylène glycols.
- Génotype.

English descriptors

KwdEn :
- Abscisic Acid (metabolism), Cell Division (drug effects), Cell Proliferation (drug effects), Genotype (MeSH), Hydrogen Peroxide (metabolism), Plant Growth Regulators (metabolism), Plant Roots (drug effects), Plant Roots (genetics), Plant Roots (growth & development), Polyethylene Glycols (metabolism), Populus (drug effects), Populus (genetics), Populus (growth & development), Sodium Chloride (metabolism).
MESH :
- chemical , metabolism : Abscisic Acid, Hydrogen Peroxide, Plant Growth Regulators, Polyethylene Glycols, Sodium Chloride.
- drug effects : Cell Division, Cell Proliferation, Plant Roots, Populus.
- genetics : Plant Roots, Populus.
- growth & development : Plant Roots, Populus.
- Genotype.

Abstract

Plant organ growth results from cell production and cell expansion. Deciphering the contribution of each of these processes to growth rate is an important issue in developmental biology. Here, we investigated the cellular processes governing root elongation rate, considering two sources of variation: genotype and disturbance by chemicals (NaCl, polyethylene glycol, H2O2, abscisic acid). Exploiting the adventitious rooting capacity of the Populus genus, and using time-lapse imaging under infrared-light, particle image velocimetry, histological analysis, and kinematics, we quantified the cellular processes involved in root growth variation, and analysed the covariation patterns between growth parameters. The rate of cell production by the root apical meristem and the number of dividing cells were estimated in vivo without destructive measurement. We found that the rate of cell division contributed more to the variation in cell production rate than the number of dividing cells. Regardless of the source of variation, the length of the elongation zone was the best proxy for growth rate, summarizing rates of cell production and cell elongation into a single parameter. Our results demonstrate that cell production rate is the main driver of growth rate, whereas elemental elongation rate is a key driver of short-term growth adjustments.

DOI: 10.1093/jxb/ery272
PubMed: 30053124
PubMed Central: PMC6184812

Affiliations:

Links toward previous steps (curation, corpus...)

to stream Main, to step Corpus: 000D28
to stream Main, to step Curation: 000D28

Le document en format XML

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<front><div type="abstract" xml:lang="en">Plant organ growth results from cell production and cell expansion. Deciphering the contribution of each of these processes to growth rate is an important issue in developmental biology. Here, we investigated the cellular processes governing root elongation rate, considering two sources of variation: genotype and disturbance by chemicals (NaCl, polyethylene glycol, H2O2, abscisic acid). Exploiting the adventitious rooting capacity of the Populus genus, and using time-lapse imaging under infrared-light, particle image velocimetry, histological analysis, and kinematics, we quantified the cellular processes involved in root growth variation, and analysed the covariation patterns between growth parameters. The rate of cell production by the root apical meristem and the number of dividing cells were estimated in vivo without destructive measurement. We found that the rate of cell division contributed more to the variation in cell production rate than the number of dividing cells. Regardless of the source of variation, the length of the elongation zone was the best proxy for growth rate, summarizing rates of cell production and cell elongation into a single parameter. Our results demonstrate that cell production rate is the main driver of growth rate, whereas elemental elongation rate is a key driver of short-term growth adjustments.</div>
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<Abstract><AbstractText>Plant organ growth results from cell production and cell expansion. Deciphering the contribution of each of these processes to growth rate is an important issue in developmental biology. Here, we investigated the cellular processes governing root elongation rate, considering two sources of variation: genotype and disturbance by chemicals (NaCl, polyethylene glycol, H2O2, abscisic acid). Exploiting the adventitious rooting capacity of the Populus genus, and using time-lapse imaging under infrared-light, particle image velocimetry, histological analysis, and kinematics, we quantified the cellular processes involved in root growth variation, and analysed the covariation patterns between growth parameters. The rate of cell production by the root apical meristem and the number of dividing cells were estimated in vivo without destructive measurement. We found that the rate of cell division contributed more to the variation in cell production rate than the number of dividing cells. Regardless of the source of variation, the length of the elongation zone was the best proxy for growth rate, summarizing rates of cell production and cell elongation into a single parameter. Our results demonstrate that cell production rate is the main driver of growth rate, whereas elemental elongation rate is a key driver of short-term growth adjustments.</AbstractText>
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<Month>07</Month>
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<PubMedPubDate PubStatus="pubmed"><Year>2018</Year>
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Quantitative dissection of variations in root growth rate: a matter of cell proliferation or of cell expansion?

Quantitative dissection of variations in root growth rate: a matter of cell proliferation or of cell expansion?

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