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Effect of iron plaque outside roots on nutrient uptake by rice (Oryza sativa L.): phosphorus uptake

Zhang, X.K. (Agricultural Univ. of Hebei, Baoding (China). Dept. of Resource and Environment Science) ; Zhang, F.S ; Mao, D.R

Plant and soil, 1999-01, Vol.209 (2), p.187-192 [Periódico revisado por pares]

Dordrecht: Kluwer Academic Publishers

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Título:
Effect of iron plaque outside roots on nutrient uptake by rice (Oryza sativa L.): phosphorus uptake
Autor: Zhang, X.K. (Agricultural Univ. of Hebei, Baoding (China). Dept. of Resource and Environment Science) ; Zhang, F.S ; Mao, D.R
Assuntos: ABSORCION DE SUSTANCIAS NUTRITIVAS ; ABSORPTION DE SUBSTANCES NUTRITIVES ; Agronomy. Soil science and plant productions ; Biological and medical sciences ; Economic plant physiology ; FER ; FOSFORO ; Fundamental and applied biological sciences. Psychology ; HIERRO ; IRON ; Mineral nutrition ; Nutrient solutions ; NUTRIENT UPTAKE ; Nutrition. Photosynthesis. Respiration. Metabolism ; ORYZA SATIVA ; PHOSPHORE ; PHOSPHORUS ; Phytosiderophores ; Plant roots ; Plants ; RACINE ; RAICES ; Rice ; Root exudates ; ROOTS ; SIDEROFOROS ; SIDEROPHORE ; SIDEROPHORES ; Wetland soils ; Zinc
É parte de: Plant and soil, 1999-01, Vol.209 (2), p.187-192
Notas: F61
2000001388
Descrição: Under anaerobic conditions, ferric hydroxide deposits on the surface of rice roots have been shown to affect the uptake of some nutrients. In the present experiment, different amount of this iron plaque were induced on the roots of rice (Oryza sativa L. cv. TZ88-145) by supplying different Fe(OH)₃ concentrations in nutrient solutions, and the effect of the iron plaque on phosphorus uptake was investigated. Results showed that 1) iron plaque adsorbed phosphorus from the growth medium, and that the amount of phosphorus adsorbed by the plaque was correlated with the amount of plaque; 2) the phosphorus concentration in the shoot increased by up to 72% after 72 h at concentration of Fe(OH)₃ in the nutrient solution from 0 to 30 mg Fe/L, corresponding with amounts of iron plaque from 0.2 to 24.5 mg g⁻¹ (root d. wt); 3) the phosphorus concentration in the shoots of rice with iron plaque was higher than that without iron plaque though the concentration in the shoot decreased when Fe(OH)₃ was added at 50 mg Fe/L producing 28.3 mg g⁻¹ (root d. wt) of plaque; and 4) the phosphorus concentrations in Fe-deficient and Fe-sufficient rice plants with iron plaque were the same, although phytosiderophores were released from the Fe-deficient roots. The phytosiderophores evidently did not mobilise phosphorus adsorbed on plaque. The results suggest that iron plaque on rice plant roots might be considered a phosphorus reservoir.
Editor: Dordrecht: Kluwer Academic Publishers
Idioma: Inglês

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Effect of iron plaque outside roots on nutrient uptake by rice (Oryza sativa L.): phosphorus uptake

Zhang, X.K. (Agricultural Univ. of Hebei, Baoding (China). Dept. of Resource and Environment Science) ; Zhang, F.S ; Mao, D.R

Dordrecht: Kluwer Academic Publishers

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