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Annals of Botany 84: 117-120, 1999
© 1999 Annals of Botany Company

COMMUNICATION

Influence of Chloride and Transpiration on Net15NO3-Uptake Rate byCitrus Roots

MIGUEL CEREZO, PILAR GARCÍA-AGUSTÍN+ and EDUARDO PRIMO-MILLO

Departamento de Ciencias Experimentales, Unidad de Biotecnología Vegetal, ESTCE Universidad Jaume I, Campus de Riu Sec, 12071, Castellón, Spain Departamento de Citricultura, Instituto Valenciano de Investigaciones Agrarias, Apartado Oficial 46113, Moncada, (Valencia), Spain

January 6, 1999 ; February 13, 1999 . March 22, 1999

ABSTRACT

Three-month-old Carrizo citrange (hybrid of Citrus sinensis L. OsbeckxPoncirus trifoliata Blanco) seedlings were grown in controlled environment chambers in pots of fine sand. Plants were irrigated with either non-saline or saline solutions over a 3-week period. After these treatments, plants were transferred to vessels containing a 5 m M15NO3K (96% atom excess15N) solution, and transpiration as well as concentration of15N and Cl-in roots, stem and leaves were measured after 24 h. Transpiration and15NO3-uptake rates were inhibited after exposure to NaCl and the concentration of salt pre-treatment determined the intensity of this inhibitory effect. To determine the effect of transpiration on NO3-absorption, net15NO3-uptake rate was measured in salt stressed and non-stressed plants exposed to different light intensities or relative humidities and also in detached roots. Reduction in NO3-uptake was more closely related to Cl-antagonism from salt stress than to reduced transpiration rate. Copyright 1999 Annals of Botany Company

Nitrate, absorption, inhibition transport system, salt, light and humidity.


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