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|Title: ||The use of inositol hexaphosphate as a phosphorus source by mycorrhizal and non-mycorrhizal Scots Pine (Pinus sylvestris)|
|Authors: ||COLPAERT, Jan|
van Laere, A.
VAN TICHELEN, Katia
van Assche, J.A.
|Issue Date: ||1997|
|Citation: ||Functional ecology, 11(4). p. 407-415|
|Abstract: ||1. The external mycelia of the ectomycorrhizal fungi Thelephora terrestris and Suillus luteus, associated with Pinus sylvestris roots, exhibited a substantial extracellular acid phosphatase activity. The activity was positively correlated with the ergosterol concentration in the growth substratum and decreased with an increasing P nutrition.
2. The pioneer species T. terrestris grew best at a high Pi nutrition level whereas S. luteus, a ‘late-stage’ mycobiont, produced more active biomass at a low Pi nutrition level.
3. The phytase activity of the external mycelia could not be detected; at the root surface a phytase activity was observed. Mycorrhizas had significantly higher activities than uninfected roots.
4. The addition of a relatively high concentration of a soluble phytate to the growth substratum resulted in an increased relative growth rate (RGR) in both mycorrhizal and non-mycorrhizal plants. The influence of the mycorrhizal fungi on the use of the phytate-P was small, despite the phytase activity of the mycorrhizal feeder roots.
5. The addition of phytate fixed on a HPLC resin did not result in an increase of the RGR and P uptake neither in the non-mycorrhizal nor in the mycorrhizal Pines. The experiment did not support the hypothesis that phytate, which has a low solubility in soils, is a useful P source for ectomycorrhizal plants.|
|Type: ||Journal Contribution|
|Appears in Collections: ||Research publications|
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