Rapid loss of phosphorus from dying ryegrass roots: the chemical components involved |
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Authors: | W R Eason E I Newman |
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Institution: | (1) Department of Botany, University of Bristol, BS8 1UG Bristol, UK;(2) Present address: Welsh Plant Breeding Station, Plas Gogerddan, SY 23 3EB Aberystwyth, UK |
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Abstract: | Summary
Lolium perenne was grown in solution culture with either ample or deficient phosphate supply (high-P and low-P plants). The concentration in the roots of phosphorus as water-soluble compounds, phospholipid and insoluble residue was measured. A supplementary experiment showed that the concentration of each component in the roots of low-P plants was similar to that in plants grown in P-deficient soil. The time-course of the decline of each P component was determined in roots detached from the shoot and left hanging in solution. During the three weeks residue P concentration in the roots declined little. In contrast, both types of root lost about three-quarters of their lipid P in the first week. Low-P roots lost little of their water-soluble P. High-P roots contained much more water-soluble P and lost much of it during the first two weeks. By the end of three weeks their water-soluble P content was levelling out at a value similar to that in low-P roots, suggesting a non-labile pool. The rapid loss of lipid P from low-P roots comprised more than half of their total loss, and the possible ecological significance of this is discussed. |
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Keywords: | Nutrient cycling Phosphorus Roots Ryegrass |
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