Spatial control of phytohormone signaling within the primary root There are many cases of regulation between hormone pathways that do not involve auxin 3 (Fig. 1). However, it appears that plants ...

Polar auxin transport is tightly regulated, and the hormone has a cardinal role in almost all important processes of a plant's life cycle, such as shoot and root growth, development, cell ...

When a stem is placed horizontally, the bottom side contains more auxin and grows more - causing the stem to grow upwards against the force of gravity. In a root placed horizontally, the bottom ...

Auxins have the opposite effect in roots. This is negative phototropism. In a root the shaded side contains more auxin but grows less. This causes the root to bend away from the light.