Spatial control of phytohormone signaling within the primary root There are many cases of regulation between hormone pathways that do not involve auxin 3 ... and indirect effects in hormone ...

Most natural rooting hormone contains actual auxin, also known as indole-3-acetic acid (IAA.) Natural rooting powder contains no synthetic growth hormones or fungicides. Pros: Natural rooting ...

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.

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 ...