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This article in AJ

  1. Vol. 58 No. 6, p. 561-562
     
    Received: Nov 29, 1965
    Published: Nov, 1966


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doi:10.2134/agronj1966.00021962005800060002x

P32 Detection of Geomagnetotropism in Winter Wheat Roots1

  1. D. G. Woolley and
  2. U. J. Pittman2

Abstract

Abstract

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.

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