Biology and Fertility of Soils

, Volume 34, Issue 3, pp 140–143

Influence of organic and inorganic phosphorus supply on the maximum secretion of acid phosphatase by plants

  •  R. Yadav
  •  J. Tarafdar
Original Paper

DOI: 10.1007/s003740100376

Cite this article as:
Yadav, R. & Tarafdar, J. Biol Fertil Soils (2001) 34: 140. doi:10.1007/s003740100376

Abstract.

Three cereals (wheat, pearl millet, sorghum), three legumes (mung bean, moth bean, clusterbean) and three oil seed crop species (groundnut, sesame, mustard) were grown in solution culture under conditions of P deficiency and with additions of inorganic P or organic P (phytin, lecithin, glycerophosphates). The plants started secreting acid phosphatase as soon as their roots emerged (24–96 h). The activities of the secreted acid phosphatases increased with plant age and were at a maximum under P-deficient conditions. Phytin increased acid phosphatase secretion to a greater extent than lecithin and glycerophosphate. The increased activities of acid phosphatase secreted under P-deficient conditions when compared with those under P-sufficient (inorganic P) conditions ranged from 2.7 times (glycerophosphate) to 5 times (negligible P, phytin) higher. Legumes secreted the maximum amount of acid phosphatase within 2 weeks after germination, then activity decreased gradually. Acid phosphatase secretion by oilseeds started at a low level and increased with the age of the plants. Only a small increase in acid phosphatase secretion by cereals was observed during the first 3 weeks of growth. The amount of acid phosphatase secreted by legumes was 22% higher than by oilseeds and 72% higher than by cereals. The results showed that an organic P concentration of 250 mg L–1 and above, and an inorganic P concentration <50 mg L–1 provide the most suitable conditions for plants to secrete a maximum amount of acid phosphatase.

Acid phosphatase secretion Cereals Legumes Oilseeds optimum condition 

Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  •  R. Yadav
    • 1
  •  J. Tarafdar
    • 1
  1. 1.Central Arid Zone Research Institute, Jodhpur-342003, Rajasthan, India

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