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P₃₂ Detection of Geomagnetotropism in Winter Wheat Roots¹

A tracer technique using radioactive phosphorus (P₃₂) was used to measure root distribution under young winter wheat plants grown in crocks.

Significantly higher (P<0.05) levels of beta activity were found in seedlings where soil wedges containing P₃₂ were oriented to the north or south side of the plants than to the east or west side. Since activity was related directly to P₃₂ uptake by the plants, this would indicate a greater root concentration in the soil on the north and south sides of the seed than elsewhere. This differential root distribution has been described as a geomagnetotropic response.

² Research Officer (now Assoc. Prof., Agronomy Department, Iowa State University, Ames, Iowa) and Research Officer, respectively, Canada Department of Agriculture Research Station, Lethbridge, Alberta.

Received for publication November 29, 1965.