Zinc toxicity in soybean grown at high iron concentration in nutrient solution

• Published in: Journal of plant nutrition Vol. 21; no. 8; pp. 1723 - 1730
• Main Authors: Fontes, R.L.F. (DPS-UFV, Vicosa, MG, Brazil.), Cox, F.R
• Format: Journal Article
• Language: English
• Published: Philadelphia, NJ Taylor & Francis Group 01-01-1998; Taylor & Francis
• Subjects: Agronomy. Soil science and plant productions; APLICACION FOLIAR; APPLICATION FOLIAIRE; APPLICATION RATES; AZUFRE; Biological and medical sciences; BIOMASA; BIOMASS; BIOMASSE; CHLOROSE; CHLOROSIS; CINC; CLOROSIS; CRECIMIENTO; CROISSANCE; Deficiencies. Phytotoxicity of elements. Salinity; DISPONIBILIDAD DE NUTRIENTES; DISPONIBILITE D'ELEMENT NUTRITIF; DOSE D'APPLICATION; DOSIS DE APLICACION; EXCES DE SUBSTANCE NUTRITIVE; EXCESO DE NUTRIENTES; FER; FEUILLE; FITOTOXICIDAD; FOLIAR APPLICATION; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; GLYCINE MAX; GROWTH; HIERRO; HOJAS; INTERACCIONES NUTRIENTE NUTRIENTE; INTERACTION NUTRIMENT NUTRIMENT; IRON; LEAVES; MOUVEMENT; MOVEMENT; MOVIMIENTO; NUTRIENT AVAILABILITY; NUTRIENT EXCESSES; NUTRIENT NUTRIENT INTERACTIONS; NUTRIENT SOLUTIONS; PHYTOTOXICITE; PHYTOTOXICITY; SINTOMAS; Soil-plant relationships. Soil fertility. Fertilization. Amendments; SOLUCIONES NUTRITIVAS; SOLUTION NUTRITIVE; SOUFRE; SULPHUR; SYMPTOME; SYMPTOMS; ZINC; Growth; Nutrient solution; Deficiency; Iron chlorosis; Iron; Plant leaf; Concentration; Inorganic element; Glycine max; Zinc; Heavy metal; Dose activity relation; Grain legume; Phytotoxicity; Leguminosae; Dicotyledones; Angiospermae; Spermatophyta
• ISSN: 0190-4167; 1532-4087
• DOI: 10.1080/01904169809365517

Iron (Fe) deficiency in plants may be caused by heavy metal toxicity and is expressed mainly by chlorosis in young leaves. Zinc (Zn) is often the heavy metal involved. The growth of soybean (Glycine max [L.] Merr.) in a 40 micromolar Zn nutrient solution was studied using a factorial 2x2x2 experiment; two Fe (20 and 100 micromolar), two S (0.02 and 20 mM), and two Fe foliar fertilization (with and without Fe-DTPA) levels. Lower dry matter yield, chlorosis in young leaves, and change in the periodic movement (light/dark) of unifoliate leaves were the main symptoms of Zn toxicity. Plants supplied with 100 micromolar Fe produced more dry matter than those supplied with 20 micromolar and did not show leaf chlorosis, but still showed a change in the periodic movement of the leaves. A high Fe supply prevented most of the detrimental effects of toxic Zn. There was no effect of sulfur (S) on plant symptoms, and foliar fertilization with Fe-DTPA did not result in regreening of chlorotic leaves