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• W2103148890 abstract "Interactions between NO3− and NO2− were studied at the level of root uptake, ion translocation (NO3−, NO2−, K+), ion xylem exudates composition and inorganic cation contents (K+, Ca2+, Mg2+) using tomato seedling (Solanum lycopersicum Mill cv. Ibiza F1). Nitrite was supplied in the medium as KNO2 (0, 0.25, 2.5, 5 and 10 mM). Plants cultivated on the same doses of KNO3 served as control. The experimental system allowed direct measurements of net NO3− and NO2− uptake. Our results showed that NO3− uptake and translocation were stimulated by external supply of K+, while they were hardly decreased by NO2− supply. Contents of K+ and Mg2+ were negatively affected in all tomato tissues by increasing nitrite concentration in the medium. Highest dose of NO2− decreased Ca2+ accumulation in shoots and conversely increased that in the roots. Histological study at the stem level revealed that nitrite (10 mM) induced a restriction of the tissue territories as well as less developed regions and some conductor tissues disorganization in this organ structure. The overall results suggest that nitrite exposure delayed growth and injured cell structure and overall nutrient uptake. Des plantules de tomate (Solanum lycopersicum Mill cv. Ibiza F1) ont été utilisées pour étudier les interactions entre l’absorption racinaire des ions NO3− and NO2−, la translocation des ions (NO3−, NO2−, K+), la composition ionique et les contenus en cations inorganiques (K+, Ca2+, Mg2+). Le nitrite a été administré sous forme KNO2 dans le milieu hydroponique (0, 0,25, 2,5, 5 and 10 mM). Les plantules cultivées avec les mêmes doses en KNO3 servent de témoin. Ce système expérimental nous a permis des mesures directes de l’absorption nette de NO3− et de NO2−. Nous études montrent que l’absorption et la translocation de NO3− ont été stimulées par l’application externe de K+, cependant, ces derniers montrent une diminution sévère en présence de NO2−. Les contenus en K+ et Mg2+ ont été négativement affectés dans tous les tissus de la tomate parallèlement à l’augmentation des ions nitrites dans le milieu. Cependant, les fortes doses de NO2− entraînent une diminution de l’accumulation en Ca2+ des parties aériennes contre une augmentation dans les tissus des racines. Les études histologiques au niveau des tiges montrent que le nitrite (10 mM) induit une restriction des territoires tissulaires ainsi que des retards dans le développement de ces régions simultanément à une désorganisation de quelques tissus conducteurs de cet organe. Ces résultats suggèrent que l’exposition au nitrite engendre un retard de la croissance accompagné des effets négatifs sur la structure de la tige et d’une perturbation de l’absorption des nutriments nutritifs." @default.
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• W2103148890 date "2011-07-01" @default.
• W2103148890 modified "2023-10-03" @default.
• W2103148890 title "Ion uptake and structural modifications induced by nitrogen source in tomato (Solanum lycopersicum Mill. Cv. Ibiza F1)" @default.
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• W2103148890 doi "https://doi.org/10.1016/j.crvi.2011.05.002" @default.
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