Plant and Soil

, Volume 202, Issue 1, pp 33–39

Effect of iron plaque outside roots on nutrient uptake by rice (Oryza sativa L.). Zinc uptake by Fe-deficient rice

  • Xike Zhang
  • Fusuo Zhang
  • Daru Mao
Article

DOI: 10.1023/A:1004322130940

Cite this article as:
Zhang, X., Zhang, F. & Mao, D. Plant and Soil (1998) 202: 33. doi:10.1023/A:1004322130940

Abstract

This solution culture study examined the effect of the deposition of iron plaque on zinc uptake by Fe-deficient rice plants. Different amounts of iron plaque were induced by adding Fe(OH)3 at 0, 10, 20, 30, and 50 mg Fe/L in the nutrient solution. After 24 h of growth, the amount of iron plaque was correlated positively with the Fe(OH)3 addition to the nutrient solution. Increasing iron plaque up to 12.1 g/kg root dry weight increased zinc concentration in shoots by 42% compared to that at 0.16 g/kg root dry weight. Increasing the amount of iron plaque further decreased zinc concentration. When the amounts of iron plaque reached 24.9 g/kg root dry weight, zinc concentration in shoots was lower than that in shoots without iron plaque, implying that the plaque became a barrier for zinc uptake. While rice plants were pre-cultured in −Fe and +Fe nutrient solution in order to produce the Fe-deficient and Fe-sufficient plants and then Fe(OH)3 was added at 20, 30, and 50 mg Fe/L in nutrient solution, zinc concentrations in shoots of Fe-deficient plants were 54, 48, and 43 mg/kg, respectively, in contrast to 32, 35, and 40 mg/kg zinc in shoots of Fe-sufficient rice plants. Furthermore, Fe(OH)3 addition at 20 mg Fe/L and increasing zinc concentration from 0.065 to 0.65 mg Zn/L in nutrient solution increased zinc uptake more in Fe-deficient plants than in Fe-sufficient plant. The results suggested that root exudates of Fe-deficient plants, especially phytosiderophores, could enhance zinc uptake by rice plants with iron plaque up to a particular amount of Fe.

iron plaque phytosiderophore rice (Oryza sativa L.) zinc uptake 

Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • Xike Zhang
    • 1
  • Fusuo Zhang
    • 3
  • Daru Mao
    • 3
  1. 1.Department of Resource and Environment Science, Faculty of AgricultureAgricultural University of HebeiBaodingChina
  2. 2.Soil Science and Plant Nutrition, Faculty of AgricultureThe University of Western AustraliaNedlandsAustralia
  3. 3.Department of Plant Nutrition, Faculty of Resource and EnvironmentChina Agricultural UniversityBeijingChina

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