Measurement of Geotropic Sensitivity of Seedlings

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Science  20 Jan 1961:
Vol. 133, Issue 3447, pp. 194-195
DOI: 10.1126/science.133.3447.194


By a new method of applying small centrifugal forces, produced by vibration of wires which hold corn seedlings on a horizontal clinostat, threshold values of the required gravitational force have been obtained. In darkness the centrifugal acceleration need be only about 0.04 cm/sec2, while in weak light it must be 10 times as great.

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