The integration of plant behaviour.—I. Separate geotropic stimulations of tip and stump in roots

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Abstract
Seedlings of Zea mays were kept with their coleoptiles and main roots horizontal for 1-2 hrs. The tips of these organs were then cut off and placed upon the decapitated roots of other similar seedlings that were kept pointing vertically downwards all the time. The latter roots curved towards the side of the tip that had been lowest when horizontal. Also seedlings with decapitated roots were arranged with the roots horizontal for 1-2 hrs. They were then arranged with the roots pointing vertically downwards again, and the tips of vertical coleoptiles of other seedlings were placed upon some of the roots. The proportion of the roots that curved towards the side that had been lower was significantly increased by the unstimulated tips.