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Planta. 2002 May;215(1):153-7. Epub 2002 Feb 2.

Root gravitropism in response to a signal originating outside of the cap.

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  • 1Department of Plant Biology, The Ohio State University, 1735 Neil Ave., Columbus, OH 43210, USA.


We have developed image analysis software linked to a rotating stage, allowing constraint of any user-selected region of a root at a prescribed angle during root gravitropism. This device allows the cap of a graviresponding root to reach vertical while maintaining a selected region within the elongation zone at a gravistimulated angle. Under these conditions gravitropic curvature of roots of Zea mays L. continues long after the root cap reaches vertical, indicating that a signal from outside of the cap can contribute to the curvature response.

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