OrangerV1, Main, Exploration, bibRecord, 003300

Kinetics of nitrate uptake by Citrus seedlings and inhibitory effects of salinity

Identifieur interne : 003300 ( Main/Exploration ); précédent : 003299; suivant : 003301

Kinetics of nitrate uptake by Citrus seedlings and inhibitory effects of salinity

Auteurs : Miguel Cerezo [Espagne] ; Pilar Garc A-Agust N [Espagne] ; M Dolores Serna [Espagne] ; Eduardo Primo-Millo [Espagne]

Source :

Plant Science [ 0168-9452 ] ; 1997.

RBID : ISTEX:53BC3AF98D5D9A59C753762C709F3B7820C6F066

Descripteurs français

Pascal (Inist)
- Absorption, Chlorure, Cinétique, Citrus reshni, Citrus sinensis Poncirus trifoliata, Etude comparative, Inhibition, Nitrate, Racine, Salinité, Sensibilité résistance.

English descriptors

KwdEn :
- Absorption, Chlorides, Comparative study, Inhibition, Kinetics, Nitrates, Root, Salinity, Sensitivity resistance.

Abstract

Nitrate absorption by roots of both Troyer citrange (hybrid of Citrus sinensis×Poncirus trifoliata) and Cleopatra mandarin (C. reshni) seedlings was studied. The ion depletion in the external nutrient solutions was used to estimate NO3− net uptake. In both rootstocks the kinetics of nitrate uptake showed a biphasic pattern in response to increasing external NO3− concentrations up to 10 mol m−3. The low concentration transport system followed Michaelis-Menten kinetics reaching saturation at 0.5 mol m−3 NO3− in both rootstocks. The apparent Kms of nitrate uptake were 282 and 281 mmol m−3 respectively, for Troyer citrange and Cleopatra mandarin. A linear system was also found at higher external NO3− concentrations (between 1–10 mol m−3). Double reciprocal plots showed that Cl− inhibited NO3− uptake competitively in the low concentration system. In contrast, the high concentration system was insensitive to external Cl−, but was inhibited when plants were pretreated with salt solutions. Net NO3− uptake in both systems was severely affected by Cl− ions more in Troyer citrange than in Cleopatra mandarin. Since Cl− accumulation in tissues was higher in Troyer citrange than in Cleopatra mandarin, a relationship between the ability to absorb Cl− and the inhibition of NO3− uptake is suggested for these plants.

Url:

https://api.istex.fr/document/53BC3AF98D5D9A59C753762C709F3B7820C6F066/fulltext/pdf

DOI: 10.1016/S0168-9452(97)00095-2

Affiliations:

Espagne

Le document en format XML

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<front><div type="abstract" xml:lang="en">Nitrate absorption by roots of both Troyer citrange (hybrid of Citrus sinensis×Poncirus trifoliata) and Cleopatra mandarin (C. reshni) seedlings was studied. The ion depletion in the external nutrient solutions was used to estimate NO3− net uptake. In both rootstocks the kinetics of nitrate uptake showed a biphasic pattern in response to increasing external NO3− concentrations up to 10 mol m−3. The low concentration transport system followed Michaelis-Menten kinetics reaching saturation at 0.5 mol m−3 NO3− in both rootstocks. The apparent Kms of nitrate uptake were 282 and 281 mmol m−3 respectively, for Troyer citrange and Cleopatra mandarin. A linear system was also found at higher external NO3− concentrations (between 1–10 mol m−3). Double reciprocal plots showed that Cl− inhibited NO3− uptake competitively in the low concentration system. In contrast, the high concentration system was insensitive to external Cl−, but was inhibited when plants were pretreated with salt solutions. Net NO3− uptake in both systems was severely affected by Cl− ions more in Troyer citrange than in Cleopatra mandarin. Since Cl− accumulation in tissues was higher in Troyer citrange than in Cleopatra mandarin, a relationship between the ability to absorb Cl− and the inhibition of NO3− uptake is suggested for these plants.</div>
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Kinetics of nitrate uptake by Citrus seedlings and inhibitory effects of salinity

Kinetics of nitrate uptake by Citrus seedlings and inhibitory effects of salinity

Source :

Descripteurs français

English descriptors

Abstract

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