Auxin transport is polar

Early experiments showed that the movement of auxin through certain plant tissues is strictly polar—that is, it is unidirectional along a line from apex to base. By inverting plants and plant parts, scientists determined that the apex-to-base direction of auxin movement has nothing to do with gravity; the polarity of this movement is a totally biological phenomenon.

Auxin transport is completely or partially polar in many plant parts. In most leaf petioles, for example, auxin

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Essentials of Human Physiology

Essentials of Human Physiology

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