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dc.contributor.authorGómez-Cadenas, Aurelio
dc.contributor.authorTadeo, Francisco R.
dc.contributor.authorPrimo-Millo, Eduardo
dc.contributor.authorTalón, Manuel
dc.identifier.citationGomez-Cadenas, A., Tadeo, F.R., Primo-Millo, E., Talón, M. (1998). Involvement of abscisic acid and ethylene in the responses of citrus seedlings to salt shock. Physiologia Plantarum, 103(4), 475-484.
dc.description.abstractThe 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-1-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.
dc.titleInvolvement of abscisic acid and ethylene in the responses of citrus seedlings to salt shock
dc.authorAddressInstituto Valenciano de Investigaciones Agrarias (IVIA), Carretera CV-315, Km. 10’7, 46113 Moncada (Valencia), Españaes 1998
dc.entidadIVIACentro de Genómica
dc.journal.titlePhysiologia Plantarum

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