OrangerV1, Main, Exploration, bibRecord, 003249

Involvement of abscisic acid and ethylene in the responses of citrus seedlings to salt shock

Identifieur interne : 003249 ( Main/Exploration ); précédent : 003248; suivant : 003250

Involvement of abscisic acid and ethylene in the responses of citrus seedlings to salt shock

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

Source :

Physiologia Plantarum : (København. 1948) [ 0031-9317 ] ; 1998.

RBID : Pascal:98-0455012

Descripteurs français

Pascal (Inist)
- Salinité, Stade juvénile plante, Osmorégulation, Conductance stomatique, Abscission, Feuille végétal, Accumulation biologique, Chlorure, Ethylène, Abscissique acide, Citrus sinensis Poncirus trifoliata.

English descriptors

KwdEn :
- Abscisic acid, Abscission, Biological accumulation, Chlorides, Ethylene, Osmoregulation, Plant juvenile growth stage, Plant leaf, Salinity, Stomatal conductance.

Abstract

The responses of salt-sensitive citrus rootstocks to 200 mM NaCl were periodically determined on seedlings of citrange Carrizo (Citrus sinensis [L.] Osbeck x Poncirus trifoliata [L.] Raf) during 30 days. The stressed seedlings adjusted osmotically, reduced stomatal conductance, increased proline content and ethylene production, and showed massive leaf abscission (92%). The salt shock also increased abscisic acid (ABA) and aminocyclopropane-l-carboxylic acid (ACC) in roots, xylem fluid and leaves, and in addition promoted Cl^- accumulation. The pattern of change of ABA, ACC and proline followed a two-phase response: an initial transient increase (10-12 days) overlapping with a gradual and continuous accumulation. This biphasic response appears to be compatible with the proposal that the transitory hormonal rises are induced by the osmotic component of salinity, whereas the Cl- increase determines the subsequent accumulations. During the second phase, Cl- levels correlated with abscission in leaves. Production of leaf ethylene was also concomitant with the increase in the abscission rate. Salt-induced abscission was either reduced with CoCl₂ (52%) or inhibited with silver thiosulphate (14%). The results suggest that in salt-stressed citrus, leaf abscission is induced by the chloride build-up through a mechanism that stimulates leaf ACC synthesis and further conversion to ethylene.

Affiliations:

Espagne

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

to stream PascalFrancis, to step Corpus: 000A71
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to stream Main, to step Merge: 003490
to stream Main, to step Curation: 003249

Le document en format XML

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<front><div type="abstract" xml:lang="en">The responses of salt-sensitive citrus rootstocks to 200 mM NaCl were periodically determined on seedlings of citrange Carrizo (Citrus sinensis [L.] Osbeck x Poncirus trifoliata [L.] Raf) during 30 days. The stressed seedlings adjusted osmotically, reduced stomatal conductance, increased proline content and ethylene production, and showed massive leaf abscission (92%). The salt shock also increased abscisic acid (ABA) and aminocyclopropane-l-carboxylic acid (ACC) in roots, xylem fluid and leaves, and in addition promoted Cl<sup>-</sup>
 accumulation. The pattern of change of ABA, ACC and proline followed a two-phase response: an initial transient increase (10-12 days) overlapping with a gradual and continuous accumulation. This biphasic response appears to be compatible with the proposal that the transitory hormonal rises are induced by the osmotic component of salinity, whereas the Cl- increase determines the subsequent accumulations. During the second phase, Cl- levels correlated with abscission in leaves. Production of leaf ethylene was also concomitant with the increase in the abscission rate. Salt-induced abscission was either reduced with CoCl<sub>2</sub>
 (52%) or inhibited with silver thiosulphate (14%). The results suggest that in salt-stressed citrus, leaf abscission is induced by the chloride build-up through a mechanism that stimulates leaf ACC synthesis and further conversion to ethylene.</div>
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Involvement of abscisic acid and ethylene in the responses of citrus seedlings to salt shock

Involvement of abscisic acid and ethylene in the responses of citrus seedlings to salt shock

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