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

Author: Cerezo M.   GARCÍA-AGUSTÍN P.   Primo-Millo E.  

Publisher: Oxford University Press

ISSN: 0305-7364

Source: Annals of Botany, Vol.84, Iss.1, 1999-07, pp. : 117-120

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Abstract

Three-month-old Carrizo citrange (hybrid of Citrus sinensis L. Osbeck×Poncirus 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.

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