Plant and Soil

, Volume 196, Issue 2, pp 261–264 | Cite as

Phosphorus deficiency enhances root exudation of low-molecular weight organic acids and utilization of sparingly soluble inorganic phosphates by radish (Raghanus satiuvs L.) and rape (Brassica napus L.) plants

  • F.S. Zhang
  • J. Ma
  • Y. P. Cao

Abstract

Root exudates were collected from radish and rape plants grown in P sufficient and P deficient nutrient solution. In radish, tartaric, malic and succinic acids were the dominant organic acids which increased between 15 times (succinic acid) and 60 times (malic acid) under P deficient conditions. In another experiment in quartz sand culture supplied with either Ca3(PO4)2 or AlPO4, radish utilized P from AlPO4 much better than from Ca3(PO4)2 whereas the opposite was true for rape. The results demonstrated the role of a particular organic acid in mobilizing sparingly soluble P and were in accordance with the preferential growth of two plants on acid (radish) and calcareous (rape) soils in China.

organic acid phosphate mobilization phosphorus deficiency radish rape root exudate 

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Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • F.S. Zhang
    • 1
  • J. Ma
    • 1
  • Y. P. Cao
    • 1
  1. 1.Department of Plant NutritionChina Agricultural UniversityBeijingP. R. China

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