OrangerV1, Main, Exploration, bibRecord, 003124

Morphological factors determining salt tolerance in citrus seedlings : the shoot to root ratio modulates passive root uptake of chloride ions and their accumulation in leaves

Identifieur interne : 003124 ( Main/Exploration ); précédent : 003123; suivant : 003125

Morphological factors determining salt tolerance in citrus seedlings : the shoot to root ratio modulates passive root uptake of chloride ions and their accumulation in leaves

Auteurs : J. L. Moya [Espagne] ; E. Primo-Millo [Espagne] ; M. Talon [Espagne]

Source :

Plant, cell and environment [ 0140-7791 ] ; 1999.

RBID : Pascal:99-0551132

Descripteurs français

Pascal (Inist)
- Résistance sel, Morphologie, Feuille végétal, Stade juvénile plante, Absorption, Transport passif, Xylème, Sève, Accumulation biologique, Sodium Chlorure, Racine, Surface foliaire, Répartition spatiale, Citrus reshni, Citrus sinensis Poncirus trifoliata.

English descriptors

KwdEn :
- Absorption, Biological accumulation, Leaf area, Morphology, Passive transport, Plant juvenile growth stage, Plant leaf, Root, Salt resistance, Sap, Sodium Chlorides, Spatial distribution, Xylem.

Abstract

The results presented in this work were obtained with two citrus genotypes, the chloride-tolerant Cleopatra mandarin (Citrus reshni Hort. ex Tan.) and the chloride-sensitive Carrizo citrange [Citrus sinensis (L.) Osb. × Poncirus trifoliata (L.) Raf.]. The data show that chloride uptake under salinization is driven by passive forces. In both species, net rates of chloride root uptake increased linearly, without saturation, with the increase of external NaCI concentrations (30-240 mol m^-3). Uptake rates, on a μg g root dry weight^-1 h^-1 basis, in Cleopatra and Carrizo decreased (from 38 to 21) and increased (from 21 to 35), respectively, with the increase (about three-fold) of the shoot to root ratio. With the appropriate shoot to root ratio in each genotype, it was demonstrated that at identical external doses of NaCI, Cl^- uptake rates and Cl^- xylem concentrations in the two species were very similar. Root pruning and defoliation showed that the amount of chloride taken by the plant was a function of the size of the root system, whereas leaf chloride concentration, the parameter responsible for salt damage, was dependent upon leaf biomass. Measurements of water transpiration suggested that chloride root uptake and leaf accumulation might be linked to water absorption and transpiration rates, respectively. The data indicate that plant morphology is a crucial factor determining salt-tolerance in citrus.

Affiliations:

Espagne

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to stream Main, to step Curation: 003124

Le document en format XML

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<term>Sodium Chlorure</term>
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<front><div type="abstract" xml:lang="en">The results presented in this work were obtained with two citrus genotypes, the chloride-tolerant Cleopatra mandarin (Citrus reshni Hort. ex Tan.) and the chloride-sensitive Carrizo citrange [Citrus sinensis (L.) Osb. × Poncirus trifoliata (L.) Raf.]. The data show that chloride uptake under salinization is driven by passive forces. In both species, net rates of chloride root uptake increased linearly, without saturation, with the increase of external NaCI concentrations (30-240 mol m<sup>-3</sup>
). Uptake rates, on a μg g root dry weight<sup>-1</sup>
 h<sup>-1</sup>
 basis, in Cleopatra and Carrizo decreased (from 38 to 21) and increased (from 21 to 35), respectively, with the increase (about three-fold) of the shoot to root ratio. With the appropriate shoot to root ratio in each genotype, it was demonstrated that at identical external doses of NaCI, Cl<sup>-</sup>
 uptake rates and Cl<sup>-</sup>
 xylem concentrations in the two species were very similar. Root pruning and defoliation showed that the amount of chloride taken by the plant was a function of the size of the root system, whereas leaf chloride concentration, the parameter responsible for salt damage, was dependent upon leaf biomass. Measurements of water transpiration suggested that chloride root uptake and leaf accumulation might be linked to water absorption and transpiration rates, respectively. The data indicate that plant morphology is a crucial factor determining salt-tolerance in citrus.</div>
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Morphological factors determining salt tolerance in citrus seedlings : the shoot to root ratio modulates passive root uptake of chloride ions and their accumulation in leaves

Morphological factors determining salt tolerance in citrus seedlings : the shoot to root ratio modulates passive root uptake of chloride ions and their accumulation in leaves

Source :

Descripteurs français

English descriptors

Abstract

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

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri