OrangerV1, Main, Exploration, bibRecord, 003370

Gibberellin-ethylene interaction controls radial expansion in citrus roots

Identifieur interne : 003370 ( Main/Exploration ); précédent : 003369; suivant : 003371

Gibberellin-ethylene interaction controls radial expansion in citrus roots

Auteurs : F. R. Tadeo [Espagne] ; A. Gomez-Cadenas [Espagne] ; W. Ben-Cheikh [Espagne] ; E. Primo-Millo [Espagne] ; M. Talon [Espagne]

Source :

Planta [ 0032-0935 ] ; 1997.

RBID : Pascal:98-0070913

Descripteurs français

Pascal (Inist)
- Gibbérelline, Ethylène, Régulation, Racine, Diamètre, Croissance, Morphogenèse, Substance croissance végétal, Citrus sinensis Poncirus trifoliata.

English descriptors

KwdEn :
- Diameter, Ethylene, Gibberellin, Growth, Morphogenesis, Plant growth substance, Regulation(control), Root.

Abstract

The involvement of gibberellins (GAs) and ethynylene in the process of root radial expansion was studied in young seedlings of Carrizo citrange [Citrus sinensis (L.) Osb. x Poncirus trifoliata (L.) Raf.]. The GA inhibitors cycocel, paclobutrazol, and tetcyclacis enhanced radial expansion of the root tip (up to 2.3-fold: as a result of increases in stele diameter and inner cortex width. The GA deficiency increased cell number and width. and changed the polarity of growth. generating wider and shorter cortical cells in the elongation zone. In the presence or absence of GA inhibitors, GA₃ decreased root tip width and reduced all parameters related to radial expansion. The ethylene inhibitors (aminooxyacetic acid; cobalt ions, CoCl₂: silver thiosulfate) suppressed swelling induced by GA deficiency, generating thinner cells just as GA₃ did. In contrast to GA₃, ethylene inhibitors produced longer cells strongly resembling those of the untreated seedlings. Ethylene released by ethephon did not modify root tip width in control plants, while root diameter behind the root tip was increased. In the presence of low and ineffective concentrations of cycocel. the ethylene precursor 1-aminocyclopropane-1-carboxylic acid increased radial expansion of root tips (1.3-fold) and changed the polarity of growth, producing wider and shorter inner cortical cells as GA inhibitors did. These observations imply, first, that ethylene is the hormonal effector of the process of root radial expansion and, second, that the endogenous GAs modulate the promotive response of ethylene.

Affiliations:

Espagne

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Le document en format XML

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<front><div type="abstract" xml:lang="en">The involvement of gibberellins (GAs) and ethynylene in the process of root radial expansion was studied in young seedlings of Carrizo citrange [Citrus sinensis (L.) Osb. x Poncirus trifoliata (L.) Raf.]. The GA inhibitors cycocel, paclobutrazol, and tetcyclacis enhanced radial expansion of the root tip (up to 2.3-fold: as a result of increases in stele diameter and inner cortex width. The GA deficiency increased cell number and width. and changed the polarity of growth. generating wider and shorter cortical cells in the elongation zone. In the presence or absence of GA inhibitors, GA<sub>3</sub>
 decreased root tip width and reduced all parameters related to radial expansion. The ethylene inhibitors (aminooxyacetic acid; cobalt ions, CoCl<sub>2</sub>
: silver thiosulfate) suppressed swelling induced by GA deficiency, generating thinner cells just as GA<sub>3</sub>
 did. In contrast to GA<sub>3</sub>
, ethylene inhibitors produced longer cells strongly resembling those of the untreated seedlings. Ethylene released by ethephon did not modify root tip width in control plants, while root diameter behind the root tip was increased. In the presence of low and ineffective concentrations of cycocel. the ethylene precursor 1-aminocyclopropane-1-carboxylic acid increased radial expansion of root tips (1.3-fold) and changed the polarity of growth, producing wider and shorter inner cortical cells as GA inhibitors did. These observations imply, first, that ethylene is the hormonal effector of the process of root radial expansion and, second, that the endogenous GAs modulate the promotive response of ethylene.</div>
</front>
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Gibberellin-ethylene interaction controls radial expansion in citrus roots

Gibberellin-ethylene interaction controls radial expansion in citrus roots

Source :

Descripteurs français

English descriptors

Abstract

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

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