Article

Plant and Soil

, Volume 196, Issue 2, pp 261-264

First online:

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. ZhangAffiliated withDepartment of Plant Nutrition, China Agricultural University
  • , J. MaAffiliated withDepartment of Plant Nutrition, China Agricultural University
  • , Y. P. CaoAffiliated withDepartment of Plant Nutrition, China Agricultural University

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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