Greetings,
I am interested in finding data on looking at mycorrhizae colonization of roots using split root systems with high P on one side and low P on the other. Does the colonization respond to total plant P or local root P?
The colonisation by mycorrhizal fungi is a systemic response, not a local response. I believe the following paper is particularly informative:
Vierheilig H, Garcia-Garrido JM, Wyss U and Piché Y 2000 Systemic suppression of mycorrhizal colonization of barley roots already colonized by AM fungi. Soil Biol. Biochem. 32:589-595
The colonisation by mycorrhizal fungi is a systemic response, not a local response. I believe the following paper is particularly informative:
Vierheilig H, Garcia-Garrido JM, Wyss U and Piché Y 2000 Systemic suppression of mycorrhizal colonization of barley roots already colonized by AM fungi. Soil Biol. Biochem. 32:589-595
That is true indeed, plants will tend to down-regulate AMF (for ecto's I don't know) under ample phosphorus in a systemic way. However, plants can quite finely allocate towards AMF dependent on local nutrient levels (or perhaps AMF performance), which means you might still find difference in your split pot design, see attached paper (I think there's are also other papers that show this, but this came in mind first).
Article Reciprocal Rewards Stabilize Cooperation in the Mycorrhizal Symbiosis
Here is an old paper that describes the relationship in red pines. MacFall, J.S., S. Slack and J. Iyer. 1991. Growth of red pine (Pinus resinosa Ait.) as influenced by phosphorus applications and Hebeloma arenosa. Can. J. Bot. 69:372-379.
and
MacFall, J.S. J. Iyer, S. Slack, and J. Berbee. 1989. Mycorrhizal-phosphorus interactions on red pine (Pinus resinosa Ait.). Agriculture, ecosystems and environment 28:321-324.
Although we did not do split root experiments, the soil P had a rapid response in the seedlings
In this paper they have used split-root systems of alfalfa inoculated by mycorrhizal fungus Glomus mosseae for systemic/local responses.
Jean-Guy Catford, Christian Staehelin, Sylvain Lerat, Yves Piché and Horst Vierheilig
Journal of Experimental Botany
Vol. 54, No. 386 (May 2003), pp. 1481-1487
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