CHANGES IN ELECTRICAL POLARITY IN THE AVENA COLEOPTILE AS AN ANTECEDENT TO HORMONE ACTION IN GEOTROPIC RESPONSE

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Abstract
When Avena coleoptiles are placed in the horizontal position, they respond to the force of gravity by establishing a transverse electrical polarity oriented so that the under side is electropositive to the upper side in the external circuit; by accumulating a greater quantity of growth hormones in the lower than remains in the upper half; and by bending upward. The exptl. evidence cited indicates that these events occur in the order mentioned. A theoretical consideration implies that the transverse electrical polarity is established before a difference in hormone cone, is considered possible. This means that the transverse electrical polarity fulfills the prime requirement of being established in the correct sequence to be considered the orienting force or polarity which is essential for lateral hormone transport.

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